26c9849330
The intended word in all these cases was the adjective "dependent". Whilst the "dependant" does exist, it is a noun and generally refers to a person. The word is rare used in general, but especially so in a technology context. Change-Id: Ic7e2d2ea6a566f4139ff1fdb77f38b0e962ccd9c
5617 lines
168 KiB
PHP
5617 lines
168 KiB
PHP
<?php
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/**
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* @defgroup Database Database
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*
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* This file deals with database interface functions
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* and query specifics/optimisations.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Database
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*/
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namespace Wikimedia\Rdbms;
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use BagOStuff;
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use Exception;
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use HashBagOStuff;
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use InvalidArgumentException;
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use LogicException;
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use Psr\Log\LoggerAwareInterface;
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use Psr\Log\LoggerInterface;
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use Psr\Log\NullLogger;
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use RuntimeException;
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use Throwable;
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use UnexpectedValueException;
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use Wikimedia\AtEase\AtEase;
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use Wikimedia\ScopedCallback;
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use Wikimedia\Timestamp\ConvertibleTimestamp;
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/**
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* Relational database abstraction object
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*
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* @stable to extend
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* @ingroup Database
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* @since 1.28
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*/
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abstract class Database implements IDatabase, IMaintainableDatabase, LoggerAwareInterface {
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/** @var BagOStuff APC cache */
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protected $srvCache;
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/** @var LoggerInterface */
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protected $connLogger;
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/** @var LoggerInterface */
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protected $queryLogger;
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/** @var LoggerInterface */
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protected $replLogger;
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/** @var callable Error logging callback */
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protected $errorLogger;
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/** @var callable Deprecation logging callback */
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protected $deprecationLogger;
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/** @var callable|null */
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protected $profiler;
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/** @var TransactionProfiler */
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protected $trxProfiler;
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/** @var DatabaseDomain */
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protected $currentDomain;
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// phpcs:ignore MediaWiki.Commenting.PropertyDocumentation.ObjectTypeHintVar
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/** @var object|resource|null Database connection */
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protected $conn;
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/** @var IDatabase|null Lazy handle to the master DB this server replicates from */
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private $lazyMasterHandle;
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/** @var string Server that this instance is currently connected to */
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protected $server;
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/** @var string User that this instance is currently connected under the name of */
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protected $user;
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/** @var string Password used to establish the current connection */
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protected $password;
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/** @var bool Whether this PHP instance is for a CLI script */
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protected $cliMode;
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/** @var string Agent name for query profiling */
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protected $agent;
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/** @var string Replication topology role of the server; one of the class ROLE_* constants */
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protected $topologyRole;
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/** @var string|null Host (or address) of the root master server for the replication topology */
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protected $topologyRootMaster;
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/** @var array Parameters used by initConnection() to establish a connection */
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protected $connectionParams;
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/** @var string[]|int[]|float[] SQL variables values to use for all new connections */
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protected $connectionVariables;
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/** @var int Row batch size to use for emulated INSERT SELECT queries */
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protected $nonNativeInsertSelectBatchSize;
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/** @var int Current bit field of class DBO_* constants */
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protected $flags;
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/** @var array Current LoadBalancer tracking information */
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protected $lbInfo = [];
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/** @var string Current SQL query delimiter */
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protected $delimiter = ';';
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/** @var array[] Current map of (table => (dbname, schema, prefix) map) */
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protected $tableAliases = [];
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/** @var string[] Current map of (index alias => index) */
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protected $indexAliases = [];
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/** @var array|null Current variables use for schema element placeholders */
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protected $schemaVars;
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/** @var string|bool|null Stashed value of html_errors INI setting */
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private $htmlErrors;
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/** @var int[] Prior flags member variable values */
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private $priorFlags = [];
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/** @var array Map of (name => 1) for locks obtained via lock() */
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protected $sessionNamedLocks = [];
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/** @var array Map of (table name => 1) for current TEMPORARY tables */
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protected $sessionTempTables = [];
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/** @var array Map of (table name => 1) for current TEMPORARY tables */
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protected $sessionDirtyTempTables = [];
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/** @var string ID of the active transaction or the empty string otherwise */
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private $trxShortId = '';
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/** @var int Transaction status */
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private $trxStatus = self::STATUS_TRX_NONE;
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/** @var Exception|null The last error that caused the status to become STATUS_TRX_ERROR */
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private $trxStatusCause;
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/** @var array|null Error details of the last statement-only rollback */
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private $trxStatusIgnoredCause;
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/** @var float|null UNIX timestamp at the time of BEGIN for the last transaction */
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private $trxTimestamp = null;
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/** @var float Replication lag estimate at the time of BEGIN for the last transaction */
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private $trxReplicaLag = null;
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/** @var string Name of the function that start the last transaction */
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private $trxFname = null;
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/** @var bool Whether possible write queries were done in the last transaction started */
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private $trxDoneWrites = false;
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/** @var bool Whether the current transaction was started implicitly due to DBO_TRX */
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private $trxAutomatic = false;
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/** @var int Counter for atomic savepoint identifiers (reset with each transaction) */
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private $trxAtomicCounter = 0;
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/** @var array List of (name, unique ID, savepoint ID) for each active atomic section level */
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private $trxAtomicLevels = [];
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/** @var bool Whether the current transaction was started implicitly by startAtomic() */
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private $trxAutomaticAtomic = false;
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/** @var string[] Write query callers of the current transaction */
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private $trxWriteCallers = [];
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/** @var float Seconds spent in write queries for the current transaction */
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private $trxWriteDuration = 0.0;
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/** @var int Number of write queries for the current transaction */
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private $trxWriteQueryCount = 0;
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/** @var int Number of rows affected by write queries for the current transaction */
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private $trxWriteAffectedRows = 0;
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/** @var float Like trxWriteQueryCount but excludes lock-bound, easy to replicate, queries */
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private $trxWriteAdjDuration = 0.0;
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/** @var int Number of write queries counted in trxWriteAdjDuration */
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private $trxWriteAdjQueryCount = 0;
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/** @var array[] List of (callable, method name, atomic section id) */
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private $trxPostCommitOrIdleCallbacks = [];
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/** @var array[] List of (callable, method name, atomic section id) */
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private $trxPreCommitOrIdleCallbacks = [];
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/**
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* @var array[] List of (callable, method name, atomic section id)
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* @phan-var array<array{0:callable,1:string,2:AtomicSectionIdentifier|null}>
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*/
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private $trxEndCallbacks = [];
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/** @var array[] List of (callable, method name, atomic section id) */
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private $trxSectionCancelCallbacks = [];
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/** @var callable[] Map of (name => callable) */
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private $trxRecurringCallbacks = [];
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/** @var bool Whether to suppress triggering of transaction end callbacks */
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private $trxEndCallbacksSuppressed = false;
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/** @var int|null Rows affected by the last query to query() or its CRUD wrappers */
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protected $affectedRowCount;
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/** @var float UNIX timestamp */
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private $lastPing = 0.0;
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/** @var string The last SQL query attempted */
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private $lastQuery = '';
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/** @var float|bool UNIX timestamp of last write query */
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private $lastWriteTime = false;
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/** @var string|bool */
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private $lastPhpError = false;
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/** @var float Query round trip time estimate */
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private $lastRoundTripEstimate = 0.0;
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/** @var int|null Integer ID of the managing LBFactory instance or null if none */
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private $ownerId;
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/** @var string Whether the database is a file on disk */
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public const ATTR_DB_IS_FILE = 'db-is-file';
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/** @var string Lock granularity is on the level of the entire database */
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public const ATTR_DB_LEVEL_LOCKING = 'db-level-locking';
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/** @var string The SCHEMA keyword refers to a grouping of tables in a database */
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public const ATTR_SCHEMAS_AS_TABLE_GROUPS = 'supports-schemas';
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/** @var int New Database instance will not be connected yet when returned */
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public const NEW_UNCONNECTED = 0;
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/** @var int New Database instance will already be connected when returned */
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public const NEW_CONNECTED = 1;
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/** @var int Transaction is in a error state requiring a full or savepoint rollback */
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public const STATUS_TRX_ERROR = 1;
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/** @var int Transaction is active and in a normal state */
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public const STATUS_TRX_OK = 2;
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/** @var int No transaction is active */
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public const STATUS_TRX_NONE = 3;
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/** @var string Idiom used when a cancelable atomic section started the transaction */
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private static $NOT_APPLICABLE = 'n/a';
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/** @var string Prefix to the atomic section counter used to make savepoint IDs */
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private static $SAVEPOINT_PREFIX = 'wikimedia_rdbms_atomic';
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/** @var int Writes to this temporary table do not affect lastDoneWrites() */
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private static $TEMP_NORMAL = 1;
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/** @var int Writes to this temporary table effect lastDoneWrites() */
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private static $TEMP_PSEUDO_PERMANENT = 2;
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/** @var int Number of times to re-try an operation in case of deadlock */
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private static $DEADLOCK_TRIES = 4;
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/** @var int Minimum time to wait before retry, in microseconds */
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private static $DEADLOCK_DELAY_MIN = 500000;
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/** @var int Maximum time to wait before retry */
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private static $DEADLOCK_DELAY_MAX = 1500000;
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/** @var int How long before it is worth doing a dummy query to test the connection */
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private static $PING_TTL = 1.0;
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/** @var string Dummy SQL query */
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private static $PING_QUERY = 'SELECT 1 AS ping';
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/** @var float Guess of how many seconds it takes to replicate a small insert */
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private static $TINY_WRITE_SEC = 0.010;
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/** @var float Consider a write slow if it took more than this many seconds */
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private static $SLOW_WRITE_SEC = 0.500;
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/** @var float Assume an insert of this many rows or less should be fast to replicate */
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private static $SMALL_WRITE_ROWS = 100;
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/** @var string[] List of DBO_* flags that can be changed after connection */
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protected static $MUTABLE_FLAGS = [
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'DBO_DEBUG',
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'DBO_NOBUFFER',
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'DBO_TRX',
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'DBO_DDLMODE',
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];
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/** @var int Bit field of all DBO_* flags that can be changed after connection */
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protected static $DBO_MUTABLE = (
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self::DBO_DEBUG | self::DBO_NOBUFFER | self::DBO_TRX | self::DBO_DDLMODE
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);
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/**
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* @note exceptions for missing libraries/drivers should be thrown in initConnection()
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* @stable to call
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* @param array $params Parameters passed from Database::factory()
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*/
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public function __construct( array $params ) {
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$this->connectionParams = [
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'host' => strlen( $params['host'] ) ? $params['host'] : null,
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'user' => strlen( $params['user'] ) ? $params['user'] : null,
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'dbname' => strlen( $params['dbname'] ) ? $params['dbname'] : null,
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'schema' => strlen( $params['schema'] ) ? $params['schema'] : null,
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'password' => is_string( $params['password'] ) ? $params['password'] : null,
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'tablePrefix' => (string)$params['tablePrefix']
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];
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$this->lbInfo = $params['lbInfo'] ?? [];
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$this->lazyMasterHandle = $params['lazyMasterHandle'] ?? null;
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$this->connectionVariables = $params['variables'] ?? [];
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$this->flags = (int)$params['flags'];
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$this->cliMode = (bool)$params['cliMode'];
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$this->agent = (string)$params['agent'];
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$this->topologyRole = (string)$params['topologyRole'];
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$this->topologyRootMaster = (string)$params['topologicalMaster'];
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$this->nonNativeInsertSelectBatchSize = $params['nonNativeInsertSelectBatchSize'] ?? 10000;
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$this->srvCache = $params['srvCache'];
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$this->profiler = is_callable( $params['profiler'] ) ? $params['profiler'] : null;
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$this->trxProfiler = $params['trxProfiler'];
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$this->connLogger = $params['connLogger'];
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$this->queryLogger = $params['queryLogger'];
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$this->replLogger = $params['replLogger'];
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$this->errorLogger = $params['errorLogger'];
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$this->deprecationLogger = $params['deprecationLogger'];
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// Set initial dummy domain until open() sets the final DB/prefix
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$this->currentDomain = new DatabaseDomain(
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$params['dbname'] != '' ? $params['dbname'] : null,
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$params['schema'] != '' ? $params['schema'] : null,
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$params['tablePrefix']
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);
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$this->ownerId = $params['ownerId'] ?? null;
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}
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/**
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* Initialize the connection to the database over the wire (or to local files)
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*
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* @throws LogicException
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* @throws InvalidArgumentException
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* @throws DBConnectionError
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* @since 1.31
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*/
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final public function initConnection() {
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if ( $this->isOpen() ) {
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throw new LogicException( __METHOD__ . ': already connected' );
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}
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// Establish the connection
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$this->doInitConnection();
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}
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/**
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* Actually connect to the database over the wire (or to local files)
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*
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* @throws DBConnectionError
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* @since 1.31
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*/
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protected function doInitConnection() {
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$this->open(
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$this->connectionParams['host'],
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$this->connectionParams['user'],
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$this->connectionParams['password'],
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$this->connectionParams['dbname'],
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$this->connectionParams['schema'],
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$this->connectionParams['tablePrefix']
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);
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}
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/**
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* Open a new connection to the database (closing any existing one)
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*
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* @param string|null $server Database server host
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* @param string|null $user Database user name
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* @param string|null $password Database user password
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* @param string|null $dbName Database name
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* @param string|null $schema Database schema name
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* @param string $tablePrefix Table prefix
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* @throws DBConnectionError
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*/
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abstract protected function open( $server, $user, $password, $dbName, $schema, $tablePrefix );
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/**
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* Construct a Database subclass instance given a database type and parameters
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*
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* This also connects to the database immediately upon object construction
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*
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* @param string $type A possible DB type (sqlite, mysql, postgres,...)
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* @param array $params Parameter map with keys:
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* - host : The hostname of the DB server
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* - user : The name of the database user the client operates under
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* - password : The password for the database user
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* - dbname : The name of the database to use where queries do not specify one.
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* The database must exist or an error might be thrown. Setting this to the empty string
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* will avoid any such errors and make the handle have no implicit database scope. This is
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* useful for queries like SHOW STATUS, CREATE DATABASE, or DROP DATABASE. Note that a
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* "database" in Postgres is rougly equivalent to an entire MySQL server. This the domain
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* in which user names and such are defined, e.g. users are database-specific in Postgres.
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* - schema : The database schema to use (if supported). A "schema" in Postgres is roughly
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* equivalent to a "database" in MySQL. Note that MySQL and SQLite do not use schemas.
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* - tablePrefix : Optional table prefix that is implicitly added on to all table names
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* recognized in queries. This can be used in place of schemas for handle site farms.
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* - flags : Optional bit field of DBO_* constants that define connection, protocol,
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* buffering, and transaction behavior. It is STRONGLY adviced to leave the DBO_DEFAULT
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* flag in place UNLESS this database simply acts as a key/value store.
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* - driver: Optional name of a specific DB client driver. For MySQL, there is only the
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* 'mysqli' driver; the old one 'mysql' has been removed.
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* - variables: Optional map of session variables to set after connecting. This can be
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* used to adjust lock timeouts or encoding modes and the like.
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* - topologyRole: Optional IDatabase::ROLE_* constant for the server.
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* - topologicalMaster: Optional name of the master server within the replication topology.
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* - lbInfo: Optional map of field/values for the managing load balancer instance.
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* The "master" and "replica" fields are used to flag the replication role of this
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* database server and whether methods like getLag() should actually issue queries.
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* - lazyMasterHandle: lazy-connecting IDatabase handle to the master DB for the cluster
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* that this database belongs to. This is used for replication status purposes.
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* - connLogger: Optional PSR-3 logger interface instance.
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* - queryLogger: Optional PSR-3 logger interface instance.
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* - profiler : Optional callback that takes a section name argument and returns
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* a ScopedCallback instance that ends the profile section in its destructor.
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* These will be called in query(), using a simplified version of the SQL that
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* also includes the agent as a SQL comment.
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* - trxProfiler: Optional TransactionProfiler instance.
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* - errorLogger: Optional callback that takes an Exception and logs it.
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* - deprecationLogger: Optional callback that takes a string and logs it.
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* - cliMode: Whether to consider the execution context that of a CLI script.
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* - agent: Optional name used to identify the end-user in query profiling/logging.
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* - srvCache: Optional BagOStuff instance to an APC-style cache.
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* - nonNativeInsertSelectBatchSize: Optional batch size for non-native INSERT SELECT.
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* - ownerId: Optional integer ID of a LoadBalancer instance that manages this instance.
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* @param int $connect One of the class constants (NEW_CONNECTED, NEW_UNCONNECTED) [optional]
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* @return Database|null If the database driver or extension cannot be found
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* @throws InvalidArgumentException If the database driver or extension cannot be found
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* @since 1.18
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*/
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final public static function factory( $type, $params = [], $connect = self::NEW_CONNECTED ) {
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$class = self::getClass( $type, $params['driver'] ?? null );
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if ( class_exists( $class ) && is_subclass_of( $class, IDatabase::class ) ) {
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$params += [
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// Default configuration
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'host' => null,
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'user' => null,
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'password' => null,
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'dbname' => null,
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'schema' => null,
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'tablePrefix' => '',
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'flags' => 0,
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'variables' => [],
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'lbInfo' => [],
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'cliMode' => ( PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg' ),
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'agent' => '',
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'ownerId' => null,
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'topologyRole' => null,
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'topologicalMaster' => null,
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// Objects and callbacks
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'lazyMasterHandle' => $params['lazyMasterHandle'] ?? null,
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'srvCache' => $params['srvCache'] ?? new HashBagOStuff(),
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'profiler' => $params['profiler'] ?? null,
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'trxProfiler' => $params['trxProfiler'] ?? new TransactionProfiler(),
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'connLogger' => $params['connLogger'] ?? new NullLogger(),
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'queryLogger' => $params['queryLogger'] ?? new NullLogger(),
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'replLogger' => $params['replLogger'] ?? new NullLogger(),
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'errorLogger' => $params['errorLogger'] ?? static function ( Throwable $e ) {
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trigger_error( get_class( $e ) . ': ' . $e->getMessage(), E_USER_WARNING );
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},
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'deprecationLogger' => $params['deprecationLogger'] ?? static function ( $msg ) {
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trigger_error( $msg, E_USER_DEPRECATED );
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}
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];
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/** @var Database $conn */
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$conn = new $class( $params );
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if ( $connect === self::NEW_CONNECTED ) {
|
|
$conn->initConnection();
|
|
}
|
|
} else {
|
|
$conn = null;
|
|
}
|
|
|
|
return $conn;
|
|
}
|
|
|
|
/**
|
|
* @param string $dbType A possible DB type (sqlite, mysql, postgres,...)
|
|
* @param string|null $driver Optional name of a specific DB client driver
|
|
* @return array Map of (Database::ATTR_* constant => value) for all such constants
|
|
* @throws InvalidArgumentException
|
|
* @since 1.31
|
|
*/
|
|
final public static function attributesFromType( $dbType, $driver = null ) {
|
|
static $defaults = [
|
|
self::ATTR_DB_IS_FILE => false,
|
|
self::ATTR_DB_LEVEL_LOCKING => false,
|
|
self::ATTR_SCHEMAS_AS_TABLE_GROUPS => false
|
|
];
|
|
|
|
$class = self::getClass( $dbType, $driver );
|
|
|
|
return call_user_func( [ $class, 'getAttributes' ] ) + $defaults;
|
|
}
|
|
|
|
/**
|
|
* @param string $dbType A possible DB type (sqlite, mysql, postgres,...)
|
|
* @param string|null $driver Optional name of a specific DB client driver
|
|
* @return string Database subclass name to use
|
|
* @throws InvalidArgumentException
|
|
*/
|
|
private static function getClass( $dbType, $driver = null ) {
|
|
// For database types with built-in support, the below maps type to IDatabase
|
|
// implementations. For types with multiple driver implementations (PHP extensions),
|
|
// an array can be used, keyed by extension name. In case of an array, the
|
|
// optional 'driver' parameter can be used to force a specific driver. Otherwise,
|
|
// we auto-detect the first available driver. For types without built-in support,
|
|
// an class named "Database<Type>" us used, eg. DatabaseFoo for type 'foo'.
|
|
static $builtinTypes = [
|
|
'mysql' => [ 'mysqli' => DatabaseMysqli::class ],
|
|
'sqlite' => DatabaseSqlite::class,
|
|
'postgres' => DatabasePostgres::class,
|
|
];
|
|
|
|
$dbType = strtolower( $dbType );
|
|
|
|
if ( !isset( $builtinTypes[$dbType] ) ) {
|
|
// Not a built in type, assume standard naming scheme
|
|
return 'Database' . ucfirst( $dbType );
|
|
}
|
|
|
|
$class = false;
|
|
$possibleDrivers = $builtinTypes[$dbType];
|
|
if ( is_string( $possibleDrivers ) ) {
|
|
$class = $possibleDrivers;
|
|
} elseif ( (string)$driver !== '' ) {
|
|
if ( !isset( $possibleDrivers[$driver] ) ) {
|
|
throw new InvalidArgumentException( __METHOD__ .
|
|
" type '$dbType' does not support driver '{$driver}'" );
|
|
}
|
|
|
|
$class = $possibleDrivers[$driver];
|
|
} else {
|
|
foreach ( $possibleDrivers as $posDriver => $possibleClass ) {
|
|
if ( extension_loaded( $posDriver ) ) {
|
|
$class = $possibleClass;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( $class === false ) {
|
|
throw new InvalidArgumentException( __METHOD__ .
|
|
" no viable database extension found for type '$dbType'" );
|
|
}
|
|
|
|
return $class;
|
|
}
|
|
|
|
/**
|
|
* @stable to override
|
|
* @return array Map of (Database::ATTR_* constant => value)
|
|
* @since 1.31
|
|
*/
|
|
protected static function getAttributes() {
|
|
return [];
|
|
}
|
|
|
|
/**
|
|
* Set the PSR-3 logger interface to use for query logging. (The logger
|
|
* interfaces for connection logging and error logging can be set with the
|
|
* constructor.)
|
|
*
|
|
* @param LoggerInterface $logger
|
|
*/
|
|
public function setLogger( LoggerInterface $logger ) {
|
|
$this->queryLogger = $logger;
|
|
}
|
|
|
|
public function getServerInfo() {
|
|
return $this->getServerVersion();
|
|
}
|
|
|
|
public function getTopologyRole() {
|
|
return $this->topologyRole;
|
|
}
|
|
|
|
public function getTopologyRootMaster() {
|
|
return $this->topologyRootMaster;
|
|
}
|
|
|
|
final public function trxLevel() {
|
|
return ( $this->trxShortId != '' ) ? 1 : 0;
|
|
}
|
|
|
|
public function trxTimestamp() {
|
|
return $this->trxLevel() ? $this->trxTimestamp : null;
|
|
}
|
|
|
|
/**
|
|
* @return int One of the STATUS_TRX_* class constants
|
|
* @since 1.31
|
|
*/
|
|
public function trxStatus() {
|
|
return $this->trxStatus;
|
|
}
|
|
|
|
public function tablePrefix( $prefix = null ) {
|
|
$old = $this->currentDomain->getTablePrefix();
|
|
if ( $prefix !== null ) {
|
|
$this->currentDomain = new DatabaseDomain(
|
|
$this->currentDomain->getDatabase(),
|
|
$this->currentDomain->getSchema(),
|
|
$prefix
|
|
);
|
|
}
|
|
|
|
return $old;
|
|
}
|
|
|
|
public function dbSchema( $schema = null ) {
|
|
if ( strlen( $schema ) && $this->getDBname() === null ) {
|
|
throw new DBUnexpectedError( $this, "Cannot set schema to '$schema'; no database set" );
|
|
}
|
|
|
|
$old = $this->currentDomain->getSchema();
|
|
if ( $schema !== null ) {
|
|
$this->currentDomain = new DatabaseDomain(
|
|
$this->currentDomain->getDatabase(),
|
|
// DatabaseDomain uses null for unspecified schemas
|
|
strlen( $schema ) ? $schema : null,
|
|
$this->currentDomain->getTablePrefix()
|
|
);
|
|
}
|
|
|
|
return (string)$old;
|
|
}
|
|
|
|
/**
|
|
* @stable to override
|
|
* @return string Schema to use to qualify relations in queries
|
|
*/
|
|
protected function relationSchemaQualifier() {
|
|
return $this->dbSchema();
|
|
}
|
|
|
|
public function getLBInfo( $name = null ) {
|
|
if ( $name === null ) {
|
|
return $this->lbInfo;
|
|
}
|
|
|
|
if ( array_key_exists( $name, $this->lbInfo ) ) {
|
|
return $this->lbInfo[$name];
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
public function setLBInfo( $nameOrArray, $value = null ) {
|
|
if ( is_array( $nameOrArray ) ) {
|
|
$this->lbInfo = $nameOrArray;
|
|
} elseif ( is_string( $nameOrArray ) ) {
|
|
if ( $value !== null ) {
|
|
$this->lbInfo[$nameOrArray] = $value;
|
|
} else {
|
|
unset( $this->lbInfo[$nameOrArray] );
|
|
}
|
|
} else {
|
|
throw new InvalidArgumentException( "Got non-string key" );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get a handle to the master server of the cluster to which this server belongs
|
|
*
|
|
* @return IDatabase|null
|
|
* @since 1.27
|
|
*/
|
|
protected function getLazyMasterHandle() {
|
|
return $this->lazyMasterHandle;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function implicitOrderby() {
|
|
return true;
|
|
}
|
|
|
|
public function lastQuery() {
|
|
return $this->lastQuery;
|
|
}
|
|
|
|
public function lastDoneWrites() {
|
|
return $this->lastWriteTime ?: false;
|
|
}
|
|
|
|
public function writesPending() {
|
|
return $this->trxLevel() && $this->trxDoneWrites;
|
|
}
|
|
|
|
public function writesOrCallbacksPending() {
|
|
return $this->trxLevel() && (
|
|
$this->trxDoneWrites ||
|
|
$this->trxPostCommitOrIdleCallbacks ||
|
|
$this->trxPreCommitOrIdleCallbacks ||
|
|
$this->trxEndCallbacks ||
|
|
$this->trxSectionCancelCallbacks
|
|
);
|
|
}
|
|
|
|
public function preCommitCallbacksPending() {
|
|
return $this->trxLevel() && $this->trxPreCommitOrIdleCallbacks;
|
|
}
|
|
|
|
/**
|
|
* @return string|null
|
|
*/
|
|
final protected function getTransactionRoundId() {
|
|
// If transaction round participation is enabled, see if one is active
|
|
if ( $this->getFlag( self::DBO_TRX ) ) {
|
|
$id = $this->getLBInfo( self::LB_TRX_ROUND_ID );
|
|
|
|
return is_string( $id ) ? $id : null;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
public function pendingWriteQueryDuration( $type = self::ESTIMATE_TOTAL ) {
|
|
if ( !$this->trxLevel() ) {
|
|
return false;
|
|
} elseif ( !$this->trxDoneWrites ) {
|
|
return 0.0;
|
|
}
|
|
|
|
switch ( $type ) {
|
|
case self::ESTIMATE_DB_APPLY:
|
|
return $this->pingAndCalculateLastTrxApplyTime();
|
|
default: // everything
|
|
return $this->trxWriteDuration;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return float Time to apply writes to replicas based on trxWrite* fields
|
|
*/
|
|
private function pingAndCalculateLastTrxApplyTime() {
|
|
// passed by reference
|
|
$rtt = null;
|
|
$this->ping( $rtt );
|
|
|
|
$rttAdjTotal = $this->trxWriteAdjQueryCount * $rtt;
|
|
$applyTime = max( $this->trxWriteAdjDuration - $rttAdjTotal, 0 );
|
|
// For omitted queries, make them count as something at least
|
|
$omitted = $this->trxWriteQueryCount - $this->trxWriteAdjQueryCount;
|
|
$applyTime += self::$TINY_WRITE_SEC * $omitted;
|
|
|
|
return $applyTime;
|
|
}
|
|
|
|
public function pendingWriteCallers() {
|
|
return $this->trxLevel() ? $this->trxWriteCallers : [];
|
|
}
|
|
|
|
public function pendingWriteRowsAffected() {
|
|
return $this->trxWriteAffectedRows;
|
|
}
|
|
|
|
/**
|
|
* List the methods that have write queries or callbacks for the current transaction
|
|
*
|
|
* This method should not be used outside of Database/LoadBalancer
|
|
*
|
|
* @return string[]
|
|
* @since 1.32
|
|
*/
|
|
public function pendingWriteAndCallbackCallers() {
|
|
$fnames = $this->pendingWriteCallers();
|
|
foreach ( [
|
|
$this->trxPostCommitOrIdleCallbacks,
|
|
$this->trxPreCommitOrIdleCallbacks,
|
|
$this->trxEndCallbacks,
|
|
$this->trxSectionCancelCallbacks
|
|
] as $callbacks ) {
|
|
foreach ( $callbacks as $callback ) {
|
|
$fnames[] = $callback[1];
|
|
}
|
|
}
|
|
|
|
return $fnames;
|
|
}
|
|
|
|
/**
|
|
* @return string
|
|
*/
|
|
private function flatAtomicSectionList() {
|
|
return array_reduce( $this->trxAtomicLevels, static function ( $accum, $v ) {
|
|
return $accum === null ? $v[0] : "$accum, " . $v[0];
|
|
} );
|
|
}
|
|
|
|
public function isOpen() {
|
|
return (bool)$this->conn;
|
|
}
|
|
|
|
public function setFlag( $flag, $remember = self::REMEMBER_NOTHING ) {
|
|
if ( $flag & ~static::$DBO_MUTABLE ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"Got $flag (allowed: " . implode( ', ', static::$MUTABLE_FLAGS ) . ')'
|
|
);
|
|
}
|
|
|
|
if ( $remember === self::REMEMBER_PRIOR ) {
|
|
$this->priorFlags[] = $this->flags;
|
|
}
|
|
|
|
$this->flags |= $flag;
|
|
}
|
|
|
|
public function clearFlag( $flag, $remember = self::REMEMBER_NOTHING ) {
|
|
if ( $flag & ~static::$DBO_MUTABLE ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"Got $flag (allowed: " . implode( ', ', static::$MUTABLE_FLAGS ) . ')'
|
|
);
|
|
}
|
|
|
|
if ( $remember === self::REMEMBER_PRIOR ) {
|
|
$this->priorFlags[] = $this->flags;
|
|
}
|
|
|
|
$this->flags &= ~$flag;
|
|
}
|
|
|
|
public function restoreFlags( $state = self::RESTORE_PRIOR ) {
|
|
if ( !$this->priorFlags ) {
|
|
return;
|
|
}
|
|
|
|
if ( $state === self::RESTORE_INITIAL ) {
|
|
$this->flags = reset( $this->priorFlags );
|
|
$this->priorFlags = [];
|
|
} else {
|
|
$this->flags = array_pop( $this->priorFlags );
|
|
}
|
|
}
|
|
|
|
public function getFlag( $flag ) {
|
|
return ( ( $this->flags & $flag ) === $flag );
|
|
}
|
|
|
|
public function getDomainID() {
|
|
return $this->currentDomain->getId();
|
|
}
|
|
|
|
/**
|
|
* Get information about an index into an object
|
|
*
|
|
* @stable to override
|
|
* @param string $table Table name
|
|
* @param string $index Index name
|
|
* @param string $fname Calling function name
|
|
* @return mixed Database-specific index description class or false if the index does not exist
|
|
*/
|
|
abstract public function indexInfo( $table, $index, $fname = __METHOD__ );
|
|
|
|
/**
|
|
* Wrapper for addslashes()
|
|
*
|
|
* @stable to override
|
|
* @param string $s String to be slashed.
|
|
* @return string Slashed string.
|
|
*/
|
|
abstract public function strencode( $s );
|
|
|
|
/**
|
|
* Set a custom error handler for logging errors during database connection
|
|
*/
|
|
protected function installErrorHandler() {
|
|
$this->lastPhpError = false;
|
|
$this->htmlErrors = ini_set( 'html_errors', '0' );
|
|
set_error_handler( [ $this, 'connectionErrorLogger' ] );
|
|
}
|
|
|
|
/**
|
|
* Restore the previous error handler and return the last PHP error for this DB
|
|
*
|
|
* @return bool|string
|
|
*/
|
|
protected function restoreErrorHandler() {
|
|
restore_error_handler();
|
|
if ( $this->htmlErrors !== false ) {
|
|
ini_set( 'html_errors', $this->htmlErrors );
|
|
}
|
|
|
|
return $this->getLastPHPError();
|
|
}
|
|
|
|
/**
|
|
* @return string|bool Last PHP error for this DB (typically connection errors)
|
|
*/
|
|
protected function getLastPHPError() {
|
|
if ( $this->lastPhpError ) {
|
|
$error = preg_replace( '!\[<a.*</a>\]!', '', $this->lastPhpError );
|
|
$error = preg_replace( '!^.*?:\s?(.*)$!', '$1', $error );
|
|
|
|
return $error;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Error handler for logging errors during database connection
|
|
* This method should not be used outside of Database classes
|
|
*
|
|
* @param int $errno
|
|
* @param string $errstr
|
|
*/
|
|
public function connectionErrorLogger( $errno, $errstr ) {
|
|
$this->lastPhpError = $errstr;
|
|
}
|
|
|
|
/**
|
|
* Create a log context to pass to PSR-3 logger functions.
|
|
*
|
|
* @param array $extras Additional data to add to context
|
|
* @return array
|
|
*/
|
|
protected function getLogContext( array $extras = [] ) {
|
|
return array_merge(
|
|
[
|
|
'db_server' => $this->server,
|
|
'db_name' => $this->getDBname(),
|
|
'db_user' => $this->user,
|
|
],
|
|
$extras
|
|
);
|
|
}
|
|
|
|
final public function close( $fname = __METHOD__, $owner = null ) {
|
|
$error = null; // error to throw after disconnecting
|
|
|
|
$wasOpen = (bool)$this->conn;
|
|
// This should mostly do nothing if the connection is already closed
|
|
if ( $this->conn ) {
|
|
// Roll back any dangling transaction first
|
|
if ( $this->trxLevel() ) {
|
|
if ( $this->trxAtomicLevels ) {
|
|
// Cannot let incomplete atomic sections be committed
|
|
$levels = $this->flatAtomicSectionList();
|
|
$error = "$fname: atomic sections $levels are still open";
|
|
} elseif ( $this->trxAutomatic ) {
|
|
// Only the connection manager can commit non-empty DBO_TRX transactions
|
|
// (empty ones we can silently roll back)
|
|
if ( $this->writesOrCallbacksPending() ) {
|
|
$error = "$fname: " .
|
|
"expected mass rollback of all peer transactions (DBO_TRX set)";
|
|
}
|
|
} else {
|
|
// Manual transactions should have been committed or rolled
|
|
// back, even if empty.
|
|
$error = "$fname: transaction is still open (from {$this->trxFname})";
|
|
}
|
|
|
|
if ( $this->trxEndCallbacksSuppressed && $error === null ) {
|
|
$error = "$fname: callbacks are suppressed; cannot properly commit";
|
|
}
|
|
|
|
// Rollback the changes and run any callbacks as needed
|
|
$this->rollback( __METHOD__, self::FLUSHING_INTERNAL );
|
|
}
|
|
|
|
// Close the actual connection in the binding handle
|
|
$closed = $this->closeConnection();
|
|
} else {
|
|
$closed = true; // already closed; nothing to do
|
|
}
|
|
|
|
$this->conn = null;
|
|
|
|
// Log or throw any unexpected errors after having disconnected
|
|
if ( $error !== null ) {
|
|
// T217819, T231443: if this is probably just LoadBalancer trying to recover from
|
|
// errors and shutdown, then log any problems and move on since the request has to
|
|
// end one way or another. Throwing errors is not very useful at some point.
|
|
if ( $this->ownerId !== null && $owner === $this->ownerId ) {
|
|
$this->queryLogger->error( $error );
|
|
} else {
|
|
throw new DBUnexpectedError( $this, $error );
|
|
}
|
|
}
|
|
|
|
// Note that various subclasses call close() at the start of open(), which itself is
|
|
// called by replaceLostConnection(). In that case, just because onTransactionResolution()
|
|
// callbacks are pending does not mean that an exception should be thrown. Rather, they
|
|
// will be executed after the reconnection step.
|
|
if ( $wasOpen ) {
|
|
// Sanity check that no callbacks are dangling
|
|
$fnames = $this->pendingWriteAndCallbackCallers();
|
|
if ( $fnames ) {
|
|
throw new RuntimeException(
|
|
"Transaction callbacks are still pending: " . implode( ', ', $fnames )
|
|
);
|
|
}
|
|
}
|
|
|
|
return $closed;
|
|
}
|
|
|
|
/**
|
|
* Make sure there is an open connection handle (alive or not) as a sanity check
|
|
*
|
|
* This guards against fatal errors to the binding handle not being defined
|
|
* in cases where open() was never called or close() was already called
|
|
*
|
|
* @throws DBUnexpectedError
|
|
*/
|
|
final protected function assertHasConnectionHandle() {
|
|
if ( !$this->isOpen() ) {
|
|
throw new DBUnexpectedError( $this, "DB connection was already closed" );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Make sure that this server is not marked as a replica nor read-only as a sanity check
|
|
*
|
|
* @throws DBReadOnlyError
|
|
*/
|
|
protected function assertIsWritableMaster() {
|
|
$info = $this->getReadOnlyReason();
|
|
if ( $info ) {
|
|
list( $reason, $source ) = $info;
|
|
if ( $source === 'role' ) {
|
|
throw new DBReadOnlyRoleError( $this, "Database is read-only: $reason" );
|
|
} else {
|
|
throw new DBReadOnlyError( $this, "Database is read-only: $reason" );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Closes underlying database connection
|
|
* @return bool Whether connection was closed successfully
|
|
* @since 1.20
|
|
*/
|
|
abstract protected function closeConnection();
|
|
|
|
/**
|
|
* Run a query and return a DBMS-dependent wrapper or boolean
|
|
*
|
|
* This is meant to handle the basic command of actually sending a query to the
|
|
* server via the driver. No implicit transaction, reconnection, nor retry logic
|
|
* should happen here. The higher level query() method is designed to handle those
|
|
* sorts of concerns. This method should not trigger such higher level methods.
|
|
*
|
|
* The lastError() and lastErrno() methods should meaningfully reflect what error,
|
|
* if any, occurred during the last call to this method. Methods like executeQuery(),
|
|
* query(), select(), insert(), update(), delete(), and upsert() implement their calls
|
|
* to doQuery() such that an immediately subsequent call to lastError()/lastErrno()
|
|
* meaningfully reflects any error that occurred during that public query method call.
|
|
*
|
|
* For SELECT queries, this returns either:
|
|
* - a) A driver-specific value/resource, only on success. This can be iterated
|
|
* over by calling fetchObject()/fetchRow() until there are no more rows.
|
|
* Alternatively, the result can be passed to resultObject() to obtain an
|
|
* IResultWrapper instance which can then be iterated over via "foreach".
|
|
* - b) False, on any query failure
|
|
*
|
|
* For non-SELECT queries, this returns either:
|
|
* - a) A driver-specific value/resource, only on success
|
|
* - b) True, only on success (e.g. no meaningful result other than "OK")
|
|
* - c) False, on any query failure
|
|
*
|
|
* @param string $sql SQL query
|
|
* @return mixed|bool An object, resource, or true on success; false on failure
|
|
*/
|
|
abstract protected function doQuery( $sql );
|
|
|
|
/**
|
|
* Determine whether a query writes to the DB. When in doubt, this returns true.
|
|
*
|
|
* Main use cases:
|
|
*
|
|
* - Subsequent web requests should not need to wait for replication from
|
|
* the master position seen by this web request, unless this request made
|
|
* changes to the master. This is handled by ChronologyProtector by checking
|
|
* doneWrites() at the end of the request. doneWrites() returns true if any
|
|
* query set lastWriteTime; which query() does based on isWriteQuery().
|
|
*
|
|
* - Reject write queries to replica DBs, in query().
|
|
*
|
|
* @param string $sql
|
|
* @param int $flags Query flags to query()
|
|
* @return bool
|
|
*/
|
|
protected function isWriteQuery( $sql, $flags ) {
|
|
if (
|
|
$this->fieldHasBit( $flags, self::QUERY_CHANGE_ROWS ) ||
|
|
$this->fieldHasBit( $flags, self::QUERY_CHANGE_SCHEMA )
|
|
) {
|
|
return true;
|
|
} elseif ( $this->fieldHasBit( $flags, self::QUERY_CHANGE_NONE ) ) {
|
|
return false;
|
|
}
|
|
// BEGIN and COMMIT queries are considered read queries here.
|
|
// Database backends and drivers (MySQL, MariaDB, php-mysqli) generally
|
|
// treat these as write queries, in that their results have "affected rows"
|
|
// as meta data as from writes, instead of "num rows" as from reads.
|
|
// But, we treat them as read queries because when reading data (from
|
|
// either replica or master) we use transactions to enable repeatable-read
|
|
// snapshots, which ensures we get consistent results from the same snapshot
|
|
// for all queries within a request. Use cases:
|
|
// - Treating these as writes would trigger ChronologyProtector (see method doc).
|
|
// - We use this method to reject writes to replicas, but we need to allow
|
|
// use of transactions on replicas for read snapshots. This is fine given
|
|
// that transactions by themselves don't make changes, only actual writes
|
|
// within the transaction matter, which we still detect.
|
|
return !preg_match(
|
|
'/^\s*(?:SELECT|BEGIN|ROLLBACK|COMMIT|SAVEPOINT|RELEASE|SET|SHOW|EXPLAIN|USE|\(SELECT)\b/i',
|
|
$sql
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param string $sql
|
|
* @return string|null
|
|
*/
|
|
protected function getQueryVerb( $sql ) {
|
|
return preg_match( '/^\s*([a-z]+)/i', $sql, $m ) ? strtoupper( $m[1] ) : null;
|
|
}
|
|
|
|
/**
|
|
* Determine whether a SQL statement is sensitive to isolation level.
|
|
*
|
|
* A SQL statement is considered transactable if its result could vary
|
|
* depending on the transaction isolation level. Operational commands
|
|
* such as 'SET' and 'SHOW' are not considered to be transactable.
|
|
*
|
|
* Main purpose: Used by query() to decide whether to begin a transaction
|
|
* before the current query (in DBO_TRX mode, on by default).
|
|
*
|
|
* @stable to override
|
|
* @param string $sql
|
|
* @return bool
|
|
*/
|
|
protected function isTransactableQuery( $sql ) {
|
|
return !in_array(
|
|
$this->getQueryVerb( $sql ),
|
|
[ 'BEGIN', 'ROLLBACK', 'COMMIT', 'SET', 'SHOW', 'CREATE', 'ALTER', 'USE', 'SHOW' ],
|
|
true
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param string $sql SQL query
|
|
* @param bool $pseudoPermanent Treat any table from CREATE TEMPORARY as pseudo-permanent
|
|
* @return array[] List of change n-tuples with:
|
|
* - int: self::TEMP_* constant for temp table operations
|
|
* - string: SQL query verb from $sql
|
|
* - string: Name of the temp table changed in $sql
|
|
*/
|
|
protected function getTempTableWrites( $sql, $pseudoPermanent ) {
|
|
// Regexes for basic queries that can create/change/drop temporary tables.
|
|
// For simplicity, this only looks for tables with sane, alphanumeric, names;
|
|
// temporary tables only need simple programming names anyway.
|
|
static $regexes = null;
|
|
if ( $regexes === null ) {
|
|
// Regex with a group for quoted table 0 and a group for quoted tables 1..N
|
|
$qts = '((?:\w+|`\w+`|\'\w+\'|"\w+")(?:\s*,\s*(?:\w+|`\w+`|\'\w+\'|"\w+"))*)';
|
|
// Regex to get query verb, table 0, and tables 1..N
|
|
$regexes = [
|
|
// DML write queries
|
|
"/^(INSERT|REPLACE)\s+(?:\w+\s+)*?INTO\s+$qts/i",
|
|
"/^(UPDATE)(?:\s+OR\s+\w+|\s+IGNORE|\s+ONLY)?\s+$qts/i",
|
|
"/^(DELETE)\s+(?:\w+\s+)*?FROM(?:\s+ONLY)?\s+$qts/i",
|
|
// DDL write queries
|
|
"/^(CREATE)\s+TEMPORARY\s+TABLE(?:\s+IF\s+NOT\s+EXISTS)?\s+$qts/i",
|
|
"/^(DROP)\s+(?:TEMPORARY\s+)?TABLE(?:\s+IF\s+EXISTS)?\s+$qts/i",
|
|
"/^(TRUNCATE)\s+(?:TEMPORARY\s+)?TABLE\s+$qts/i",
|
|
"/^(ALTER)\s+TABLE\s+$qts/i"
|
|
];
|
|
}
|
|
|
|
$queryVerb = null;
|
|
$queryTables = [];
|
|
foreach ( $regexes as $regex ) {
|
|
if ( preg_match( $regex, $sql, $m, PREG_UNMATCHED_AS_NULL ) ) {
|
|
$queryVerb = $m[1];
|
|
$allTables = preg_split( '/\s*,\s*/', $m[2] );
|
|
foreach ( $allTables as $quotedTable ) {
|
|
$queryTables[] = trim( $quotedTable, "\"'`" );
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
$tempTableChanges = [];
|
|
foreach ( $queryTables as $table ) {
|
|
if ( $queryVerb === 'CREATE' ) {
|
|
// Record the type of temporary table being created
|
|
$tableType = $pseudoPermanent ? self::$TEMP_PSEUDO_PERMANENT : self::$TEMP_NORMAL;
|
|
} else {
|
|
$tableType = $this->sessionTempTables[$table] ?? null;
|
|
}
|
|
|
|
if ( $tableType !== null ) {
|
|
$tempTableChanges[] = [ $tableType, $queryVerb, $table ];
|
|
}
|
|
}
|
|
|
|
return $tempTableChanges;
|
|
}
|
|
|
|
/**
|
|
* @param IResultWrapper|bool $ret
|
|
* @param array[] $changes List of change n-tuples with from getTempWrites()
|
|
*/
|
|
protected function registerTempWrites( $ret, array $changes ) {
|
|
if ( $ret === false ) {
|
|
return;
|
|
}
|
|
|
|
foreach ( $changes as list( $tmpTableType, $verb, $table ) ) {
|
|
switch ( $verb ) {
|
|
case 'CREATE':
|
|
$this->sessionTempTables[$table] = $tmpTableType;
|
|
break;
|
|
case 'DROP':
|
|
unset( $this->sessionTempTables[$table] );
|
|
unset( $this->sessionDirtyTempTables[$table] );
|
|
break;
|
|
case 'TRUNCATE':
|
|
unset( $this->sessionDirtyTempTables[$table] );
|
|
break;
|
|
default:
|
|
$this->sessionDirtyTempTables[$table] = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if the table is both a TEMPORARY table and has not yet received CRUD operations
|
|
*
|
|
* @param string $table
|
|
* @return bool
|
|
* @since 1.35
|
|
*/
|
|
protected function isPristineTemporaryTable( $table ) {
|
|
$rawTable = $this->tableName( $table, 'raw' );
|
|
|
|
return (
|
|
isset( $this->sessionTempTables[$rawTable] ) &&
|
|
!isset( $this->sessionDirtyTempTables[$rawTable] )
|
|
);
|
|
}
|
|
|
|
public function query( $sql, $fname = __METHOD__, $flags = self::QUERY_NORMAL ) {
|
|
$flags = (int)$flags; // b/c; this field used to be a bool
|
|
// Sanity check that the SQL query is appropriate in the current context and is
|
|
// allowed for an outside caller (e.g. does not break transaction/session tracking).
|
|
$this->assertQueryIsCurrentlyAllowed( $sql, $fname );
|
|
|
|
// Send the query to the server and fetch any corresponding errors
|
|
list( $ret, $err, $errno, $unignorable ) = $this->executeQuery( $sql, $fname, $flags );
|
|
if ( $ret === false ) {
|
|
$ignoreErrors = $this->fieldHasBit( $flags, self::QUERY_SILENCE_ERRORS );
|
|
// Throw an error unless both the ignore flag was set and a rollback is not needed
|
|
$this->reportQueryError( $err, $errno, $sql, $fname, $ignoreErrors && !$unignorable );
|
|
}
|
|
|
|
return $this->resultObject( $ret );
|
|
}
|
|
|
|
/**
|
|
* Execute a query, retrying it if there is a recoverable connection loss
|
|
*
|
|
* This is similar to query() except:
|
|
* - It does not prevent all non-ROLLBACK queries if there is a corrupted transaction
|
|
* - It does not disallow raw queries that are supposed to use dedicated IDatabase methods
|
|
* - It does not throw exceptions for common error cases
|
|
*
|
|
* This is meant for internal use with Database subclasses.
|
|
*
|
|
* @param string $sql Original SQL query
|
|
* @param string $fname Name of the calling function
|
|
* @param int $flags Bit field of class QUERY_* constants
|
|
* @return array An n-tuple of:
|
|
* - mixed|bool: An object, resource, or true on success; false on failure
|
|
* - string: The result of calling lastError()
|
|
* - int: The result of calling lastErrno()
|
|
* - bool: Whether a rollback is needed to allow future non-rollback queries
|
|
* @throws DBUnexpectedError
|
|
*/
|
|
final protected function executeQuery( $sql, $fname, $flags ) {
|
|
$this->assertHasConnectionHandle();
|
|
|
|
$priorTransaction = $this->trxLevel();
|
|
|
|
if ( $this->isWriteQuery( $sql, $flags ) ) {
|
|
// Do not treat temporary table writes as "meaningful writes" since they are only
|
|
// visible to one session and are not permanent. Profile them as reads. Integration
|
|
// tests can override this behavior via $flags.
|
|
$pseudoPermanent = $this->fieldHasBit( $flags, self::QUERY_PSEUDO_PERMANENT );
|
|
$tempTableChanges = $this->getTempTableWrites( $sql, $pseudoPermanent );
|
|
$isPermWrite = !$tempTableChanges;
|
|
foreach ( $tempTableChanges as list( $tmpType ) ) {
|
|
$isPermWrite = $isPermWrite || ( $tmpType !== self::$TEMP_NORMAL );
|
|
}
|
|
|
|
// Permit temporary table writes on replica DB connections
|
|
// but require a writable master connection for any persistent writes.
|
|
if ( $isPermWrite ) {
|
|
$this->assertIsWritableMaster();
|
|
|
|
// DBConnRef uses QUERY_REPLICA_ROLE to enforce the replica role for raw SQL queries
|
|
if ( $this->fieldHasBit( $flags, self::QUERY_REPLICA_ROLE ) ) {
|
|
throw new DBReadOnlyRoleError( $this, "Cannot write; target role is DB_REPLICA" );
|
|
}
|
|
}
|
|
} else {
|
|
// No permanent writes in this query
|
|
$isPermWrite = false;
|
|
// No temporary tables written to either
|
|
$tempTableChanges = [];
|
|
}
|
|
|
|
// Add trace comment to the begin of the sql string, right after the operator.
|
|
// Or, for one-word queries (like "BEGIN" or COMMIT") add it to the end (T44598).
|
|
$encAgent = str_replace( '/', '-', $this->agent );
|
|
$commentedSql = preg_replace( '/\s|$/', " /* $fname $encAgent */ ", $sql, 1 );
|
|
|
|
// Send the query to the server and fetch any corresponding errors.
|
|
// This also doubles as a "ping" to see if the connection was dropped.
|
|
list( $ret, $err, $errno, $recoverableSR, $recoverableCL, $reconnected ) =
|
|
$this->executeQueryAttempt( $sql, $commentedSql, $isPermWrite, $fname, $flags );
|
|
|
|
// Check if the query failed due to a recoverable connection loss
|
|
$allowRetry = !$this->fieldHasBit( $flags, self::QUERY_NO_RETRY );
|
|
if ( $ret === false && $recoverableCL && $reconnected && $allowRetry ) {
|
|
// Silently resend the query to the server since it is safe and possible
|
|
list( $ret, $err, $errno, $recoverableSR, $recoverableCL ) =
|
|
$this->executeQueryAttempt( $sql, $commentedSql, $isPermWrite, $fname, $flags );
|
|
}
|
|
|
|
// Register creation and dropping of temporary tables
|
|
$this->registerTempWrites( $ret, $tempTableChanges );
|
|
|
|
$corruptedTrx = false;
|
|
|
|
if ( $ret === false ) {
|
|
if ( $priorTransaction ) {
|
|
if ( $recoverableSR ) {
|
|
# We're ignoring an error that caused just the current query to be aborted.
|
|
# But log the cause so we can log a deprecation notice if a caller actually
|
|
# does ignore it.
|
|
$this->trxStatusIgnoredCause = [ $err, $errno, $fname ];
|
|
} elseif ( !$recoverableCL ) {
|
|
# Either the query was aborted or all queries after BEGIN where aborted.
|
|
# In the first case, the only options going forward are (a) ROLLBACK, or
|
|
# (b) ROLLBACK TO SAVEPOINT (if one was set). If the later case, the only
|
|
# option is ROLLBACK, since the snapshots would have been released.
|
|
$corruptedTrx = true; // cannot recover
|
|
$this->trxStatus = self::STATUS_TRX_ERROR;
|
|
$this->trxStatusCause = $this->getQueryException( $err, $errno, $sql, $fname );
|
|
$this->trxStatusIgnoredCause = null;
|
|
}
|
|
}
|
|
}
|
|
|
|
return [ $ret, $err, $errno, $corruptedTrx ];
|
|
}
|
|
|
|
/**
|
|
* Wrapper for doQuery() that handles DBO_TRX, profiling, logging, affected row count
|
|
* tracking, and reconnects (without retry) on query failure due to connection loss
|
|
*
|
|
* @param string $sql Original SQL query
|
|
* @param string $commentedSql SQL query with debugging/trace comment
|
|
* @param bool $isPermWrite Whether the query is a (non-temporary table) write
|
|
* @param string $fname Name of the calling function
|
|
* @param int $flags Bit field of class QUERY_* constants
|
|
* @return array An n-tuple of:
|
|
* - mixed|bool: An object, resource, or true on success; false on failure
|
|
* - string: The result of calling lastError()
|
|
* - int: The result of calling lastErrno()
|
|
* - bool: Whether a statement rollback error occurred
|
|
* - bool: Whether a disconnect *both* happened *and* was recoverable
|
|
* - bool: Whether a reconnection attempt was *both* made *and* succeeded
|
|
* @throws DBUnexpectedError
|
|
*/
|
|
private function executeQueryAttempt( $sql, $commentedSql, $isPermWrite, $fname, $flags ) {
|
|
$priorWritesPending = $this->writesOrCallbacksPending();
|
|
|
|
if ( ( $flags & self::QUERY_IGNORE_DBO_TRX ) == 0 ) {
|
|
$this->beginIfImplied( $sql, $fname );
|
|
}
|
|
|
|
// Keep track of whether the transaction has write queries pending
|
|
if ( $isPermWrite ) {
|
|
$this->lastWriteTime = microtime( true );
|
|
if ( $this->trxLevel() && !$this->trxDoneWrites ) {
|
|
$this->trxDoneWrites = true;
|
|
$this->trxProfiler->transactionWritingIn(
|
|
$this->server, $this->getDomainID(), $this->trxShortId );
|
|
}
|
|
}
|
|
|
|
$prefix = $this->topologyRole ? 'query-m: ' : 'query: ';
|
|
$generalizedSql = new GeneralizedSql( $sql, $this->trxShortId, $prefix );
|
|
|
|
$startTime = microtime( true );
|
|
$ps = $this->profiler
|
|
? ( $this->profiler )( $generalizedSql->stringify() )
|
|
: null;
|
|
$this->affectedRowCount = null;
|
|
$this->lastQuery = $sql;
|
|
$ret = $this->doQuery( $commentedSql );
|
|
$lastError = $this->lastError();
|
|
$lastErrno = $this->lastErrno();
|
|
|
|
$this->affectedRowCount = $this->affectedRows();
|
|
unset( $ps ); // profile out (if set)
|
|
$queryRuntime = max( microtime( true ) - $startTime, 0.0 );
|
|
|
|
$recoverableSR = false; // recoverable statement rollback?
|
|
$recoverableCL = false; // recoverable connection loss?
|
|
$reconnected = false; // reconnection both attempted and succeeded?
|
|
|
|
if ( $ret !== false ) {
|
|
$this->lastPing = $startTime;
|
|
if ( $isPermWrite && $this->trxLevel() ) {
|
|
$this->updateTrxWriteQueryTime( $sql, $queryRuntime, $this->affectedRows() );
|
|
$this->trxWriteCallers[] = $fname;
|
|
}
|
|
} elseif ( $this->wasConnectionError( $lastErrno ) ) {
|
|
# Check if no meaningful session state was lost
|
|
$recoverableCL = $this->canRecoverFromDisconnect( $sql, $priorWritesPending );
|
|
# Update session state tracking and try to restore the connection
|
|
$reconnected = $this->replaceLostConnection( __METHOD__ );
|
|
} else {
|
|
# Check if only the last query was rolled back
|
|
$recoverableSR = $this->wasKnownStatementRollbackError();
|
|
}
|
|
|
|
if ( $sql === self::$PING_QUERY ) {
|
|
$this->lastRoundTripEstimate = $queryRuntime;
|
|
}
|
|
|
|
$this->trxProfiler->recordQueryCompletion(
|
|
$generalizedSql,
|
|
$startTime,
|
|
$isPermWrite,
|
|
$isPermWrite ? $this->affectedRows() : $this->numRows( $ret )
|
|
);
|
|
|
|
// Avoid the overhead of logging calls unless debug mode is enabled
|
|
if ( $this->getFlag( self::DBO_DEBUG ) ) {
|
|
$this->queryLogger->debug(
|
|
"{method} [{runtime}s] {db_host}: {sql}",
|
|
[
|
|
'method' => $fname,
|
|
'db_host' => $this->getServer(),
|
|
'sql' => $sql,
|
|
'domain' => $this->getDomainID(),
|
|
'runtime' => round( $queryRuntime, 3 )
|
|
]
|
|
);
|
|
}
|
|
|
|
return [ $ret, $lastError, $lastErrno, $recoverableSR, $recoverableCL, $reconnected ];
|
|
}
|
|
|
|
/**
|
|
* Start an implicit transaction if DBO_TRX is enabled and no transaction is active
|
|
*
|
|
* @param string $sql
|
|
* @param string $fname
|
|
*/
|
|
private function beginIfImplied( $sql, $fname ) {
|
|
if (
|
|
!$this->trxLevel() &&
|
|
$this->getFlag( self::DBO_TRX ) &&
|
|
$this->isTransactableQuery( $sql )
|
|
) {
|
|
$this->begin( __METHOD__ . " ($fname)", self::TRANSACTION_INTERNAL );
|
|
$this->trxAutomatic = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Update the estimated run-time of a query, not counting large row lock times
|
|
*
|
|
* LoadBalancer can be set to rollback transactions that will create huge replication
|
|
* lag. It bases this estimate off of pendingWriteQueryDuration(). Certain simple
|
|
* queries, like inserting a row can take a long time due to row locking. This method
|
|
* uses some simple heuristics to discount those cases.
|
|
*
|
|
* @param string $sql A SQL write query
|
|
* @param float $runtime Total runtime, including RTT
|
|
* @param int $affected Affected row count
|
|
*/
|
|
private function updateTrxWriteQueryTime( $sql, $runtime, $affected ) {
|
|
// Whether this is indicative of replica DB runtime (except for RBR or ws_repl)
|
|
$indicativeOfReplicaRuntime = true;
|
|
if ( $runtime > self::$SLOW_WRITE_SEC ) {
|
|
$verb = $this->getQueryVerb( $sql );
|
|
// insert(), upsert(), replace() are fast unless bulky in size or blocked on locks
|
|
if ( $verb === 'INSERT' ) {
|
|
$indicativeOfReplicaRuntime = $this->affectedRows() > self::$SMALL_WRITE_ROWS;
|
|
} elseif ( $verb === 'REPLACE' ) {
|
|
$indicativeOfReplicaRuntime = $this->affectedRows() > self::$SMALL_WRITE_ROWS / 2;
|
|
}
|
|
}
|
|
|
|
$this->trxWriteDuration += $runtime;
|
|
$this->trxWriteQueryCount += 1;
|
|
$this->trxWriteAffectedRows += $affected;
|
|
if ( $indicativeOfReplicaRuntime ) {
|
|
$this->trxWriteAdjDuration += $runtime;
|
|
$this->trxWriteAdjQueryCount += 1;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Error out if the DB is not in a valid state for a query via query()
|
|
*
|
|
* @param string $sql
|
|
* @param string $fname
|
|
* @throws DBTransactionStateError
|
|
*/
|
|
private function assertQueryIsCurrentlyAllowed( $sql, $fname ) {
|
|
$verb = $this->getQueryVerb( $sql );
|
|
if ( $verb === 'USE' ) {
|
|
throw new DBUnexpectedError( $this, "Got USE query; use selectDomain() instead" );
|
|
}
|
|
|
|
if ( $verb === 'ROLLBACK' ) { // transaction/savepoint
|
|
return;
|
|
}
|
|
|
|
if ( $this->trxStatus < self::STATUS_TRX_OK ) {
|
|
throw new DBTransactionStateError(
|
|
$this,
|
|
"Cannot execute query from $fname while transaction status is ERROR",
|
|
[],
|
|
$this->trxStatusCause
|
|
);
|
|
} elseif ( $this->trxStatus === self::STATUS_TRX_OK && $this->trxStatusIgnoredCause ) {
|
|
list( $iLastError, $iLastErrno, $iFname ) = $this->trxStatusIgnoredCause;
|
|
call_user_func( $this->deprecationLogger,
|
|
"Caller from $fname ignored an error originally raised from $iFname: " .
|
|
"[$iLastErrno] $iLastError"
|
|
);
|
|
$this->trxStatusIgnoredCause = null;
|
|
}
|
|
}
|
|
|
|
public function assertNoOpenTransactions() {
|
|
if ( $this->explicitTrxActive() ) {
|
|
throw new DBTransactionError(
|
|
$this,
|
|
"Explicit transaction still active. A caller may have caught an error. "
|
|
. "Open transactions: " . $this->flatAtomicSectionList()
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Determine whether it is safe to retry queries after a database connection is lost
|
|
*
|
|
* @param string $sql SQL query
|
|
* @param bool $priorWritesPending Whether there is a transaction open with
|
|
* possible write queries or transaction pre-commit/idle callbacks
|
|
* waiting on it to finish.
|
|
* @return bool True if it is safe to retry the query, false otherwise
|
|
*/
|
|
private function canRecoverFromDisconnect( $sql, $priorWritesPending ) {
|
|
# Transaction dropped; this can mean lost writes, or REPEATABLE-READ snapshots.
|
|
# Dropped connections also mean that named locks are automatically released.
|
|
# Only allow error suppression in autocommit mode or when the lost transaction
|
|
# didn't matter anyway (aside from DBO_TRX snapshot loss).
|
|
if ( $this->sessionNamedLocks ) {
|
|
return false; // possible critical section violation
|
|
} elseif ( $this->sessionTempTables ) {
|
|
return false; // tables might be queried latter
|
|
} elseif ( $sql === 'COMMIT' ) {
|
|
return !$priorWritesPending; // nothing written anyway? (T127428)
|
|
} elseif ( $sql === 'ROLLBACK' ) {
|
|
return true; // transaction lost...which is also what was requested :)
|
|
} elseif ( $this->explicitTrxActive() ) {
|
|
return false; // don't drop atomicity and explicit snapshots
|
|
} elseif ( $priorWritesPending ) {
|
|
return false; // prior writes lost from implicit transaction
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Clean things up after session (and thus transaction) loss before reconnect
|
|
*/
|
|
private function handleSessionLossPreconnect() {
|
|
// Clean up tracking of session-level things...
|
|
// https://dev.mysql.com/doc/refman/5.7/en/implicit-commit.html
|
|
// https://www.postgresql.org/docs/9.2/static/sql-createtable.html (ignoring ON COMMIT)
|
|
$this->sessionTempTables = [];
|
|
$this->sessionDirtyTempTables = [];
|
|
// https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html#function_get-lock
|
|
// https://www.postgresql.org/docs/9.4/static/functions-admin.html#FUNCTIONS-ADVISORY-LOCKS
|
|
$this->sessionNamedLocks = [];
|
|
// Session loss implies transaction loss
|
|
$oldTrxShortId = $this->consumeTrxShortId();
|
|
$this->trxAtomicCounter = 0;
|
|
$this->trxPostCommitOrIdleCallbacks = []; // T67263; transaction already lost
|
|
$this->trxPreCommitOrIdleCallbacks = []; // T67263; transaction already lost
|
|
// Clear additional subclass fields
|
|
$this->doHandleSessionLossPreconnect();
|
|
// @note: leave trxRecurringCallbacks in place
|
|
if ( $this->trxDoneWrites ) {
|
|
$this->trxProfiler->transactionWritingOut(
|
|
$this->server,
|
|
$this->getDomainID(),
|
|
$oldTrxShortId,
|
|
$this->pendingWriteQueryDuration( self::ESTIMATE_TOTAL ),
|
|
$this->trxWriteAffectedRows
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reset any additional subclass trx* and session* fields
|
|
* @stable to override
|
|
*/
|
|
protected function doHandleSessionLossPreconnect() {
|
|
// no-op
|
|
}
|
|
|
|
/**
|
|
* Clean things up after session (and thus transaction) loss after reconnect
|
|
*/
|
|
private function handleSessionLossPostconnect() {
|
|
try {
|
|
// Handle callbacks in trxEndCallbacks, e.g. onTransactionResolution().
|
|
// If callback suppression is set then the array will remain unhandled.
|
|
$this->runOnTransactionIdleCallbacks( self::TRIGGER_ROLLBACK );
|
|
} catch ( Throwable $ex ) {
|
|
// Already logged; move on...
|
|
}
|
|
try {
|
|
// Handle callbacks in trxRecurringCallbacks, e.g. setTransactionListener()
|
|
$this->runTransactionListenerCallbacks( self::TRIGGER_ROLLBACK );
|
|
} catch ( Throwable $ex ) {
|
|
// Already logged; move on...
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reset the transaction ID and return the old one
|
|
*
|
|
* @return string The old transaction ID or the empty string if there wasn't one
|
|
*/
|
|
private function consumeTrxShortId() {
|
|
$old = $this->trxShortId;
|
|
$this->trxShortId = '';
|
|
|
|
return $old;
|
|
}
|
|
|
|
/**
|
|
* Checks whether the cause of the error is detected to be a timeout.
|
|
*
|
|
* It returns false by default, and not all engines support detecting this yet.
|
|
* If this returns false, it will be treated as a generic query error.
|
|
*
|
|
* @stable to override
|
|
* @param string $error Error text
|
|
* @param int $errno Error number
|
|
* @return bool
|
|
*/
|
|
protected function wasQueryTimeout( $error, $errno ) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Report a query error. Log the error, and if neither the object ignore
|
|
* flag nor the $ignoreErrors flag is set, throw a DBQueryError.
|
|
*
|
|
* @param string $error
|
|
* @param int $errno
|
|
* @param string $sql
|
|
* @param string $fname
|
|
* @param bool $ignore
|
|
* @throws DBQueryError
|
|
*/
|
|
public function reportQueryError( $error, $errno, $sql, $fname, $ignore = false ) {
|
|
if ( $ignore ) {
|
|
$this->queryLogger->debug( "SQL ERROR (ignored): $error" );
|
|
} else {
|
|
throw $this->getQueryExceptionAndLog( $error, $errno, $sql, $fname );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string $error
|
|
* @param string|int $errno
|
|
* @param string $sql
|
|
* @param string $fname
|
|
* @return DBError
|
|
*/
|
|
private function getQueryExceptionAndLog( $error, $errno, $sql, $fname ) {
|
|
// Information that instances of the same problem have in common should
|
|
// not be normalized (T255202).
|
|
$this->queryLogger->error(
|
|
"Error $errno from $fname, {error} {sql1line} {db_server}",
|
|
$this->getLogContext( [
|
|
'method' => __METHOD__,
|
|
'errno' => $errno,
|
|
'error' => $error,
|
|
'sql1line' => mb_substr( str_replace( "\n", "\\n", $sql ), 0, 5 * 1024 ),
|
|
'fname' => $fname,
|
|
'exception' => new RuntimeException()
|
|
] )
|
|
);
|
|
return $this->getQueryException( $error, $errno, $sql, $fname );
|
|
}
|
|
|
|
/**
|
|
* @param string $error
|
|
* @param string|int $errno
|
|
* @param string $sql
|
|
* @param string $fname
|
|
* @return DBError
|
|
*/
|
|
private function getQueryException( $error, $errno, $sql, $fname ) {
|
|
if ( $this->wasQueryTimeout( $error, $errno ) ) {
|
|
return new DBQueryTimeoutError( $this, $error, $errno, $sql, $fname );
|
|
} elseif ( $this->wasConnectionError( $errno ) ) {
|
|
return new DBQueryDisconnectedError( $this, $error, $errno, $sql, $fname );
|
|
} else {
|
|
return new DBQueryError( $this, $error, $errno, $sql, $fname );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string $error
|
|
* @return DBConnectionError
|
|
*/
|
|
final protected function newExceptionAfterConnectError( $error ) {
|
|
// Connection was not fully initialized and is not safe for use
|
|
$this->conn = null;
|
|
|
|
$this->connLogger->error(
|
|
"Error connecting to {db_server} as user {db_user}: {error}",
|
|
$this->getLogContext( [
|
|
'error' => $error,
|
|
'exception' => new RuntimeException()
|
|
] )
|
|
);
|
|
|
|
return new DBConnectionError( $this, $error );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function freeResult( $res ) {
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
*/
|
|
public function newSelectQueryBuilder() {
|
|
return new SelectQueryBuilder( $this );
|
|
}
|
|
|
|
public function selectField(
|
|
$table, $var, $cond = '', $fname = __METHOD__, $options = [], $join_conds = []
|
|
) {
|
|
if ( $var === '*' ) { // sanity
|
|
throw new DBUnexpectedError( $this, "Cannot use a * field" );
|
|
} elseif ( is_array( $var ) && count( $var ) !== 1 ) {
|
|
throw new DBUnexpectedError( $this, 'Cannot use more than one field' );
|
|
}
|
|
|
|
$options = $this->normalizeOptions( $options );
|
|
$options['LIMIT'] = 1;
|
|
|
|
$res = $this->select( $table, $var, $cond, $fname, $options, $join_conds );
|
|
if ( $res === false ) {
|
|
throw new DBUnexpectedError( $this, "Got false from select()" );
|
|
}
|
|
|
|
$row = $this->fetchRow( $res );
|
|
if ( $row === false ) {
|
|
return false;
|
|
}
|
|
|
|
return reset( $row );
|
|
}
|
|
|
|
public function selectFieldValues(
|
|
$table, $var, $cond = '', $fname = __METHOD__, $options = [], $join_conds = []
|
|
) {
|
|
if ( $var === '*' ) { // sanity
|
|
throw new DBUnexpectedError( $this, "Cannot use a * field" );
|
|
} elseif ( !is_string( $var ) ) { // sanity
|
|
throw new DBUnexpectedError( $this, "Cannot use an array of fields" );
|
|
}
|
|
|
|
$options = $this->normalizeOptions( $options );
|
|
$res = $this->select( $table, [ 'value' => $var ], $cond, $fname, $options, $join_conds );
|
|
if ( $res === false ) {
|
|
throw new DBUnexpectedError( $this, "Got false from select()" );
|
|
}
|
|
|
|
$values = [];
|
|
foreach ( $res as $row ) {
|
|
$values[] = $row->value;
|
|
}
|
|
|
|
return $values;
|
|
}
|
|
|
|
/**
|
|
* Returns an optional USE INDEX clause to go after the table, and a
|
|
* string to go at the end of the query.
|
|
*
|
|
* @see Database::select()
|
|
*
|
|
* @stable to override
|
|
* @param array $options Associative array of options to be turned into
|
|
* an SQL query, valid keys are listed in the function.
|
|
* @return array
|
|
*/
|
|
protected function makeSelectOptions( array $options ) {
|
|
$preLimitTail = $postLimitTail = '';
|
|
$startOpts = '';
|
|
|
|
$noKeyOptions = [];
|
|
|
|
foreach ( $options as $key => $option ) {
|
|
if ( is_numeric( $key ) ) {
|
|
$noKeyOptions[$option] = true;
|
|
}
|
|
}
|
|
|
|
$preLimitTail .= $this->makeGroupByWithHaving( $options );
|
|
|
|
$preLimitTail .= $this->makeOrderBy( $options );
|
|
|
|
if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
|
|
$postLimitTail .= ' FOR UPDATE';
|
|
}
|
|
|
|
if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) {
|
|
$postLimitTail .= ' LOCK IN SHARE MODE';
|
|
}
|
|
|
|
if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
|
|
$startOpts .= 'DISTINCT';
|
|
}
|
|
|
|
# Various MySQL extensions
|
|
if ( isset( $noKeyOptions['STRAIGHT_JOIN'] ) ) {
|
|
$startOpts .= ' /*! STRAIGHT_JOIN */';
|
|
}
|
|
|
|
if ( isset( $noKeyOptions['SQL_BIG_RESULT'] ) ) {
|
|
$startOpts .= ' SQL_BIG_RESULT';
|
|
}
|
|
|
|
if ( isset( $noKeyOptions['SQL_BUFFER_RESULT'] ) ) {
|
|
$startOpts .= ' SQL_BUFFER_RESULT';
|
|
}
|
|
|
|
if ( isset( $noKeyOptions['SQL_SMALL_RESULT'] ) ) {
|
|
$startOpts .= ' SQL_SMALL_RESULT';
|
|
}
|
|
|
|
if ( isset( $noKeyOptions['SQL_CALC_FOUND_ROWS'] ) ) {
|
|
$startOpts .= ' SQL_CALC_FOUND_ROWS';
|
|
}
|
|
|
|
if ( isset( $options['USE INDEX'] ) && is_string( $options['USE INDEX'] ) ) {
|
|
$useIndex = $this->useIndexClause( $options['USE INDEX'] );
|
|
} else {
|
|
$useIndex = '';
|
|
}
|
|
if ( isset( $options['IGNORE INDEX'] ) && is_string( $options['IGNORE INDEX'] ) ) {
|
|
$ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
|
|
} else {
|
|
$ignoreIndex = '';
|
|
}
|
|
|
|
return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
|
|
}
|
|
|
|
/**
|
|
* Returns an optional GROUP BY with an optional HAVING
|
|
*
|
|
* @param array $options Associative array of options
|
|
* @return string
|
|
* @see Database::select()
|
|
* @since 1.21
|
|
*/
|
|
protected function makeGroupByWithHaving( $options ) {
|
|
$sql = '';
|
|
if ( isset( $options['GROUP BY'] ) ) {
|
|
$gb = is_array( $options['GROUP BY'] )
|
|
? implode( ',', $options['GROUP BY'] )
|
|
: $options['GROUP BY'];
|
|
$sql .= ' GROUP BY ' . $gb;
|
|
}
|
|
if ( isset( $options['HAVING'] ) ) {
|
|
$having = is_array( $options['HAVING'] )
|
|
? $this->makeList( $options['HAVING'], self::LIST_AND )
|
|
: $options['HAVING'];
|
|
$sql .= ' HAVING ' . $having;
|
|
}
|
|
|
|
return $sql;
|
|
}
|
|
|
|
/**
|
|
* Returns an optional ORDER BY
|
|
*
|
|
* @param array $options Associative array of options
|
|
* @return string
|
|
* @see Database::select()
|
|
* @since 1.21
|
|
*/
|
|
protected function makeOrderBy( $options ) {
|
|
if ( isset( $options['ORDER BY'] ) ) {
|
|
$ob = is_array( $options['ORDER BY'] )
|
|
? implode( ',', $options['ORDER BY'] )
|
|
: $options['ORDER BY'];
|
|
|
|
return ' ORDER BY ' . $ob;
|
|
}
|
|
|
|
return '';
|
|
}
|
|
|
|
public function select(
|
|
$table, $vars, $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
|
|
) {
|
|
$sql = $this->selectSQLText( $table, $vars, $conds, $fname, $options, $join_conds );
|
|
|
|
return $this->query( $sql, $fname, self::QUERY_CHANGE_NONE );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function selectSQLText( $table, $vars, $conds = '', $fname = __METHOD__,
|
|
$options = [], $join_conds = []
|
|
) {
|
|
if ( is_array( $vars ) ) {
|
|
$fields = implode( ',', $this->fieldNamesWithAlias( $vars ) );
|
|
} else {
|
|
$fields = $vars;
|
|
}
|
|
|
|
$options = (array)$options;
|
|
$useIndexes = ( isset( $options['USE INDEX'] ) && is_array( $options['USE INDEX'] ) )
|
|
? $options['USE INDEX']
|
|
: [];
|
|
$ignoreIndexes = (
|
|
isset( $options['IGNORE INDEX'] ) &&
|
|
is_array( $options['IGNORE INDEX'] )
|
|
)
|
|
? $options['IGNORE INDEX']
|
|
: [];
|
|
|
|
if (
|
|
$this->selectOptionsIncludeLocking( $options ) &&
|
|
$this->selectFieldsOrOptionsAggregate( $vars, $options )
|
|
) {
|
|
// Some DB types (e.g. postgres) disallow FOR UPDATE with aggregate
|
|
// functions. Discourage use of such queries to encourage compatibility.
|
|
call_user_func(
|
|
$this->deprecationLogger,
|
|
__METHOD__ . ": aggregation used with a locking SELECT ($fname)"
|
|
);
|
|
}
|
|
|
|
if ( is_array( $table ) ) {
|
|
if ( count( $table ) === 0 ) {
|
|
$from = '';
|
|
} else {
|
|
$from = ' FROM ' .
|
|
$this->tableNamesWithIndexClauseOrJOIN(
|
|
$table, $useIndexes, $ignoreIndexes, $join_conds );
|
|
}
|
|
} elseif ( $table != '' ) {
|
|
$from = ' FROM ' .
|
|
$this->tableNamesWithIndexClauseOrJOIN(
|
|
[ $table ], $useIndexes, $ignoreIndexes, [] );
|
|
} else {
|
|
$from = '';
|
|
}
|
|
|
|
list( $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ) =
|
|
$this->makeSelectOptions( $options );
|
|
|
|
if ( is_array( $conds ) ) {
|
|
$conds = $this->makeList( $conds, self::LIST_AND );
|
|
}
|
|
|
|
if ( $conds === null || $conds === false ) {
|
|
$this->queryLogger->warning(
|
|
__METHOD__
|
|
. ' called from '
|
|
. $fname
|
|
. ' with incorrect parameters: $conds must be a string or an array'
|
|
);
|
|
$conds = '';
|
|
}
|
|
|
|
if ( $conds === '' || $conds === '*' ) {
|
|
$sql = "SELECT $startOpts $fields $from $useIndex $ignoreIndex $preLimitTail";
|
|
} elseif ( is_string( $conds ) ) {
|
|
$sql = "SELECT $startOpts $fields $from $useIndex $ignoreIndex " .
|
|
"WHERE $conds $preLimitTail";
|
|
} else {
|
|
throw new DBUnexpectedError( $this, __METHOD__ . ' called with incorrect parameters' );
|
|
}
|
|
|
|
if ( isset( $options['LIMIT'] ) ) {
|
|
$sql = $this->limitResult( $sql, $options['LIMIT'],
|
|
$options['OFFSET'] ?? false );
|
|
}
|
|
$sql = "$sql $postLimitTail";
|
|
|
|
if ( isset( $options['EXPLAIN'] ) ) {
|
|
$sql = 'EXPLAIN ' . $sql;
|
|
}
|
|
|
|
return $sql;
|
|
}
|
|
|
|
public function selectRow( $table, $vars, $conds, $fname = __METHOD__,
|
|
$options = [], $join_conds = []
|
|
) {
|
|
$options = (array)$options;
|
|
$options['LIMIT'] = 1;
|
|
|
|
$res = $this->select( $table, $vars, $conds, $fname, $options, $join_conds );
|
|
if ( $res === false ) {
|
|
throw new DBUnexpectedError( $this, "Got false from select()" );
|
|
}
|
|
|
|
if ( !$this->numRows( $res ) ) {
|
|
return false;
|
|
}
|
|
|
|
return $this->fetchObject( $res );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function estimateRowCount(
|
|
$tables, $var = '*', $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
|
|
) {
|
|
$conds = $this->normalizeConditions( $conds, $fname );
|
|
$column = $this->extractSingleFieldFromList( $var );
|
|
if ( is_string( $column ) && !in_array( $column, [ '*', '1' ] ) ) {
|
|
$conds[] = "$column IS NOT NULL";
|
|
}
|
|
|
|
$res = $this->select(
|
|
$tables, [ 'rowcount' => 'COUNT(*)' ], $conds, $fname, $options, $join_conds
|
|
);
|
|
$row = $res ? $this->fetchRow( $res ) : [];
|
|
|
|
return isset( $row['rowcount'] ) ? (int)$row['rowcount'] : 0;
|
|
}
|
|
|
|
public function selectRowCount(
|
|
$tables, $var = '*', $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
|
|
) {
|
|
$conds = $this->normalizeConditions( $conds, $fname );
|
|
$column = $this->extractSingleFieldFromList( $var );
|
|
if ( is_string( $column ) && !in_array( $column, [ '*', '1' ] ) ) {
|
|
$conds[] = "$column IS NOT NULL";
|
|
}
|
|
|
|
$res = $this->select(
|
|
[
|
|
'tmp_count' => $this->buildSelectSubquery(
|
|
$tables,
|
|
'1',
|
|
$conds,
|
|
$fname,
|
|
$options,
|
|
$join_conds
|
|
)
|
|
],
|
|
[ 'rowcount' => 'COUNT(*)' ],
|
|
[],
|
|
$fname
|
|
);
|
|
$row = $res ? $this->fetchRow( $res ) : [];
|
|
|
|
return isset( $row['rowcount'] ) ? (int)$row['rowcount'] : 0;
|
|
}
|
|
|
|
/**
|
|
* @param string|array $options
|
|
* @return bool
|
|
*/
|
|
private function selectOptionsIncludeLocking( $options ) {
|
|
$options = (array)$options;
|
|
foreach ( [ 'FOR UPDATE', 'LOCK IN SHARE MODE' ] as $lock ) {
|
|
if ( in_array( $lock, $options, true ) ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param array|string $fields
|
|
* @param array|string $options
|
|
* @return bool
|
|
*/
|
|
private function selectFieldsOrOptionsAggregate( $fields, $options ) {
|
|
foreach ( (array)$options as $key => $value ) {
|
|
if ( is_string( $key ) ) {
|
|
if ( preg_match( '/^(?:GROUP BY|HAVING)$/i', $key ) ) {
|
|
return true;
|
|
}
|
|
} elseif ( is_string( $value ) ) {
|
|
if ( preg_match( '/^(?:DISTINCT|DISTINCTROW)$/i', $value ) ) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
$regex = '/^(?:COUNT|MIN|MAX|SUM|GROUP_CONCAT|LISTAGG|ARRAY_AGG)\s*\\(/i';
|
|
foreach ( (array)$fields as $field ) {
|
|
if ( is_string( $field ) && preg_match( $regex, $field ) ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param array $rowOrRows A single (field => value) map or a list of such maps
|
|
* @return array[] List of (field => value) maps
|
|
* @since 1.35
|
|
*/
|
|
final protected function normalizeRowArray( array $rowOrRows ) {
|
|
if ( !$rowOrRows ) {
|
|
$rows = [];
|
|
} elseif ( isset( $rowOrRows[0] ) ) {
|
|
$rows = $rowOrRows;
|
|
} else {
|
|
$rows = [ $rowOrRows ];
|
|
}
|
|
|
|
foreach ( $rows as $row ) {
|
|
if ( !is_array( $row ) ) {
|
|
throw new DBUnexpectedError( $this, "Got non-array in row array" );
|
|
} elseif ( !$row ) {
|
|
throw new DBUnexpectedError( $this, "Got empty array in row array" );
|
|
}
|
|
}
|
|
|
|
return $rows;
|
|
}
|
|
|
|
/**
|
|
* @param array|string $conds
|
|
* @param string $fname
|
|
* @return array
|
|
* @since 1.31
|
|
*/
|
|
final protected function normalizeConditions( $conds, $fname ) {
|
|
if ( $conds === null || $conds === false ) {
|
|
$this->queryLogger->warning(
|
|
__METHOD__
|
|
. ' called from '
|
|
. $fname
|
|
. ' with incorrect parameters: $conds must be a string or an array'
|
|
);
|
|
return [];
|
|
} elseif ( $conds === '' ) {
|
|
return [];
|
|
}
|
|
|
|
return is_array( $conds ) ? $conds : [ $conds ];
|
|
}
|
|
|
|
/**
|
|
* @param string|string[]|string[][] $uniqueKeys Unique indexes (first is identity key)
|
|
* @return string[][] Unique indexes as column lists (first index is the identity key)
|
|
* @since 1.35
|
|
*/
|
|
final protected function normalizeUpsertKeys( $uniqueKeys ) {
|
|
if ( is_string( $uniqueKeys ) ) {
|
|
return [ [ $uniqueKeys ] ];
|
|
}
|
|
|
|
if ( !is_array( $uniqueKeys ) || !$uniqueKeys ) {
|
|
throw new DBUnexpectedError( $this, 'Invalid or empty unique key array' );
|
|
}
|
|
|
|
$oldStyle = false;
|
|
$uniqueColumnSets = [];
|
|
foreach ( $uniqueKeys as $i => $uniqueKey ) {
|
|
if ( !is_int( $i ) ) {
|
|
throw new DBUnexpectedError( $this, 'Unique key array should be a list' );
|
|
} elseif ( is_string( $uniqueKey ) ) {
|
|
$oldStyle = true;
|
|
$uniqueColumnSets[] = [ $uniqueKey ];
|
|
} elseif ( is_array( $uniqueKey ) && $uniqueKey ) {
|
|
$uniqueColumnSets[] = $uniqueKey;
|
|
} else {
|
|
throw new DBUnexpectedError( $this, 'Invalid unique key array entry' );
|
|
}
|
|
}
|
|
|
|
if ( count( $uniqueColumnSets ) > 1 ) {
|
|
// If an existing row conflicts with new row X on key A and new row Y on key B,
|
|
// it is not well defined how many UPDATEs should apply to the existing row and
|
|
// in what order the new rows are checked
|
|
$this->queryLogger->warning(
|
|
__METHOD__ . " called with multiple unique keys",
|
|
[ 'exception' => new RuntimeException() ]
|
|
);
|
|
}
|
|
|
|
if ( $oldStyle ) {
|
|
// Passing a list of strings for single-column unique keys is too
|
|
// easily confused with passing the columns of composite unique key
|
|
$this->queryLogger->warning(
|
|
__METHOD__ . " called with deprecated parameter style: " .
|
|
"the unique key array should be a string or array of string arrays",
|
|
[ 'exception' => new RuntimeException() ]
|
|
);
|
|
}
|
|
|
|
return $uniqueColumnSets;
|
|
}
|
|
|
|
/**
|
|
* @param string|array $options
|
|
* @return array Combination option/value map and boolean option list
|
|
* @since 1.35
|
|
*/
|
|
final protected function normalizeOptions( $options ) {
|
|
if ( is_array( $options ) ) {
|
|
return $options;
|
|
} elseif ( is_string( $options ) ) {
|
|
return ( $options === '' ) ? [] : [ $options ];
|
|
} else {
|
|
throw new DBUnexpectedError( $this, __METHOD__ . ': expected string or array' );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string $option Query option flag (e.g. "IGNORE" or "FOR UPDATE")
|
|
* @param array $options Combination option/value map and boolean option list
|
|
* @return bool Whether the option appears as an integer-keyed value in the options
|
|
* @since 1.35
|
|
*/
|
|
final protected function isFlagInOptions( $option, array $options ) {
|
|
foreach ( array_keys( $options, $option, true ) as $k ) {
|
|
if ( is_int( $k ) ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param array|string $var Field parameter in the style of select()
|
|
* @return string|null Column name or null; ignores aliases
|
|
*/
|
|
final protected function extractSingleFieldFromList( $var ) {
|
|
if ( is_array( $var ) ) {
|
|
if ( !$var ) {
|
|
$column = null;
|
|
} elseif ( count( $var ) == 1 ) {
|
|
$column = $var[0] ?? reset( $var );
|
|
} else {
|
|
throw new DBUnexpectedError( $this, __METHOD__ . ': got multiple columns' );
|
|
}
|
|
} else {
|
|
$column = $var;
|
|
}
|
|
|
|
return $column;
|
|
}
|
|
|
|
public function lockForUpdate(
|
|
$table, $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
|
|
) {
|
|
if ( !$this->trxLevel() && !$this->getFlag( self::DBO_TRX ) ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
__METHOD__ . ': no transaction is active nor is DBO_TRX set'
|
|
);
|
|
}
|
|
|
|
$options = (array)$options;
|
|
$options[] = 'FOR UPDATE';
|
|
|
|
return $this->selectRowCount( $table, '*', $conds, $fname, $options, $join_conds );
|
|
}
|
|
|
|
public function fieldExists( $table, $field, $fname = __METHOD__ ) {
|
|
$info = $this->fieldInfo( $table, $field );
|
|
|
|
return (bool)$info;
|
|
}
|
|
|
|
public function indexExists( $table, $index, $fname = __METHOD__ ) {
|
|
if ( !$this->tableExists( $table, $fname ) ) {
|
|
return null;
|
|
}
|
|
|
|
$info = $this->indexInfo( $table, $index, $fname );
|
|
if ( $info === null ) {
|
|
return null;
|
|
} else {
|
|
return $info !== false;
|
|
}
|
|
}
|
|
|
|
abstract public function tableExists( $table, $fname = __METHOD__ );
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function indexUnique( $table, $index, $fname = __METHOD__ ) {
|
|
$indexInfo = $this->indexInfo( $table, $index, $fname );
|
|
|
|
if ( !$indexInfo ) {
|
|
return null;
|
|
}
|
|
|
|
return !$indexInfo[0]->Non_unique;
|
|
}
|
|
|
|
public function insert( $table, $rows, $fname = __METHOD__, $options = [] ) {
|
|
$rows = $this->normalizeRowArray( $rows );
|
|
if ( !$rows ) {
|
|
return true;
|
|
}
|
|
|
|
$options = $this->normalizeOptions( $options );
|
|
if ( $this->isFlagInOptions( 'IGNORE', $options ) ) {
|
|
$this->doInsertNonConflicting( $table, $rows, $fname );
|
|
} else {
|
|
$this->doInsert( $table, $rows, $fname );
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @see Database::insert()
|
|
* @stable to override
|
|
* @param string $table
|
|
* @param array $rows Non-empty list of rows
|
|
* @param string $fname
|
|
* @since 1.35
|
|
*/
|
|
protected function doInsert( $table, array $rows, $fname ) {
|
|
$encTable = $this->tableName( $table );
|
|
list( $sqlColumns, $sqlTuples ) = $this->makeInsertLists( $rows );
|
|
|
|
$sql = "INSERT INTO $encTable ($sqlColumns) VALUES $sqlTuples";
|
|
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_ROWS );
|
|
}
|
|
|
|
/**
|
|
* @see Database::insert()
|
|
* @stable to override
|
|
* @param string $table
|
|
* @param array $rows Non-empty list of rows
|
|
* @param string $fname
|
|
* @since 1.35
|
|
*/
|
|
protected function doInsertNonConflicting( $table, array $rows, $fname ) {
|
|
$encTable = $this->tableName( $table );
|
|
list( $sqlColumns, $sqlTuples ) = $this->makeInsertLists( $rows );
|
|
list( $sqlVerb, $sqlOpts ) = $this->makeInsertNonConflictingVerbAndOptions();
|
|
|
|
$sql = rtrim( "$sqlVerb $encTable ($sqlColumns) VALUES $sqlTuples $sqlOpts" );
|
|
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_ROWS );
|
|
}
|
|
|
|
/**
|
|
* @stable to override
|
|
* @return string[] ("INSERT"-style SQL verb, "ON CONFLICT"-style clause or "")
|
|
* @since 1.35
|
|
*/
|
|
protected function makeInsertNonConflictingVerbAndOptions() {
|
|
return [ 'INSERT IGNORE INTO', '' ];
|
|
}
|
|
|
|
/**
|
|
* Make SQL lists of columns, row tuples for INSERT/VALUES expressions
|
|
*
|
|
* The tuple column order is that of the columns of the first provided row.
|
|
* The provided rows must have exactly the same keys and ordering thereof.
|
|
*
|
|
* @param array[] $rows Non-empty list of (column => value) maps
|
|
* @return array (comma-separated columns, comma-separated tuples)
|
|
* @since 1.35
|
|
*/
|
|
protected function makeInsertLists( array $rows ) {
|
|
$firstRow = $rows[0];
|
|
if ( !is_array( $firstRow ) || !$firstRow ) {
|
|
throw new DBUnexpectedError( $this, 'Got an empty row list or empty row' );
|
|
}
|
|
// List of columns that define the value tuple ordering
|
|
$tupleColumns = array_keys( $firstRow );
|
|
|
|
$valueTuples = [];
|
|
foreach ( $rows as $row ) {
|
|
$rowColumns = array_keys( $row );
|
|
// VALUES(...) requires a uniform correspondance of (column => value)
|
|
if ( $rowColumns !== $tupleColumns ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
'Got row columns (' . implode( ', ', $rowColumns ) . ') ' .
|
|
'instead of expected (' . implode( ', ', $tupleColumns ) . ')'
|
|
);
|
|
}
|
|
// Make the value tuple that defines this row
|
|
$valueTuples[] = '(' . $this->makeList( $row, self::LIST_COMMA ) . ')';
|
|
}
|
|
|
|
return [
|
|
$this->makeList( $tupleColumns, self::LIST_NAMES ),
|
|
implode( ',', $valueTuples )
|
|
];
|
|
}
|
|
|
|
/**
|
|
* Make UPDATE options array for Database::makeUpdateOptions
|
|
*
|
|
* @stable to override
|
|
* @param array $options
|
|
* @return array
|
|
*/
|
|
protected function makeUpdateOptionsArray( $options ) {
|
|
$options = $this->normalizeOptions( $options );
|
|
|
|
$opts = [];
|
|
|
|
if ( in_array( 'IGNORE', $options ) ) {
|
|
$opts[] = 'IGNORE';
|
|
}
|
|
|
|
return $opts;
|
|
}
|
|
|
|
/**
|
|
* Make UPDATE options for the Database::update function
|
|
*
|
|
* @stable to override
|
|
* @param array $options The options passed to Database::update
|
|
* @return string
|
|
*/
|
|
protected function makeUpdateOptions( $options ) {
|
|
$opts = $this->makeUpdateOptionsArray( $options );
|
|
|
|
return implode( ' ', $opts );
|
|
}
|
|
|
|
public function update( $table, $set, $conds, $fname = __METHOD__, $options = [] ) {
|
|
$this->assertConditionIsNotEmpty( $conds, __METHOD__, true );
|
|
$table = $this->tableName( $table );
|
|
$opts = $this->makeUpdateOptions( $options );
|
|
$sql = "UPDATE $opts $table SET " . $this->makeList( $set, self::LIST_SET );
|
|
|
|
if ( $conds && $conds !== IDatabase::ALL_ROWS ) {
|
|
if ( is_array( $conds ) ) {
|
|
$conds = $this->makeList( $conds, self::LIST_AND );
|
|
}
|
|
$sql .= ' WHERE ' . $conds;
|
|
}
|
|
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_ROWS );
|
|
|
|
return true;
|
|
}
|
|
|
|
public function makeList( array $a, $mode = self::LIST_COMMA ) {
|
|
$first = true;
|
|
$list = '';
|
|
|
|
foreach ( $a as $field => $value ) {
|
|
if ( $first ) {
|
|
$first = false;
|
|
} else {
|
|
if ( $mode == self::LIST_AND ) {
|
|
$list .= ' AND ';
|
|
} elseif ( $mode == self::LIST_OR ) {
|
|
$list .= ' OR ';
|
|
} else {
|
|
$list .= ',';
|
|
}
|
|
}
|
|
|
|
if ( ( $mode == self::LIST_AND || $mode == self::LIST_OR ) && is_numeric( $field ) ) {
|
|
$list .= "($value)";
|
|
} elseif ( $mode == self::LIST_SET && is_numeric( $field ) ) {
|
|
$list .= "$value";
|
|
} elseif (
|
|
( $mode == self::LIST_AND || $mode == self::LIST_OR ) && is_array( $value )
|
|
) {
|
|
// Remove null from array to be handled separately if found
|
|
$includeNull = false;
|
|
foreach ( array_keys( $value, null, true ) as $nullKey ) {
|
|
$includeNull = true;
|
|
unset( $value[$nullKey] );
|
|
}
|
|
if ( count( $value ) == 0 && !$includeNull ) {
|
|
throw new InvalidArgumentException(
|
|
__METHOD__ . ": empty input for field $field" );
|
|
} elseif ( count( $value ) == 0 ) {
|
|
// only check if $field is null
|
|
$list .= "$field IS NULL";
|
|
} else {
|
|
// IN clause contains at least one valid element
|
|
if ( $includeNull ) {
|
|
// Group subconditions to ensure correct precedence
|
|
$list .= '(';
|
|
}
|
|
if ( count( $value ) == 1 ) {
|
|
// Special-case single values, as IN isn't terribly efficient
|
|
// Don't necessarily assume the single key is 0; we don't
|
|
// enforce linear numeric ordering on other arrays here.
|
|
$value = array_values( $value )[0];
|
|
$list .= $field . " = " . $this->addQuotes( $value );
|
|
} else {
|
|
$list .= $field . " IN (" . $this->makeList( $value ) . ") ";
|
|
}
|
|
// if null present in array, append IS NULL
|
|
if ( $includeNull ) {
|
|
$list .= " OR $field IS NULL)";
|
|
}
|
|
}
|
|
} elseif ( $value === null ) {
|
|
if ( $mode == self::LIST_AND || $mode == self::LIST_OR ) {
|
|
$list .= "$field IS ";
|
|
} elseif ( $mode == self::LIST_SET ) {
|
|
$list .= "$field = ";
|
|
}
|
|
$list .= 'NULL';
|
|
} else {
|
|
if (
|
|
$mode == self::LIST_AND || $mode == self::LIST_OR || $mode == self::LIST_SET
|
|
) {
|
|
$list .= "$field = ";
|
|
}
|
|
$list .= $mode == self::LIST_NAMES ? $value : $this->addQuotes( $value );
|
|
}
|
|
}
|
|
|
|
return $list;
|
|
}
|
|
|
|
public function makeWhereFrom2d( $data, $baseKey, $subKey ) {
|
|
$conds = [];
|
|
|
|
foreach ( $data as $base => $sub ) {
|
|
if ( count( $sub ) ) {
|
|
$conds[] = $this->makeList(
|
|
[ $baseKey => $base, $subKey => array_map( 'strval', array_keys( $sub ) ) ],
|
|
self::LIST_AND
|
|
);
|
|
}
|
|
}
|
|
|
|
if ( $conds ) {
|
|
return $this->makeList( $conds, self::LIST_OR );
|
|
} else {
|
|
// Nothing to search for...
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function aggregateValue( $valuedata, $valuename = 'value' ) {
|
|
return $valuename;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function bitNot( $field ) {
|
|
return "(~$field)";
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function bitAnd( $fieldLeft, $fieldRight ) {
|
|
return "($fieldLeft & $fieldRight)";
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function bitOr( $fieldLeft, $fieldRight ) {
|
|
return "($fieldLeft | $fieldRight)";
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function buildConcat( $stringList ) {
|
|
return 'CONCAT(' . implode( ',', $stringList ) . ')';
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function buildGroupConcatField(
|
|
$delim, $table, $field, $conds = '', $join_conds = []
|
|
) {
|
|
$fld = "GROUP_CONCAT($field SEPARATOR " . $this->addQuotes( $delim ) . ')';
|
|
|
|
return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function buildGreatest( $fields, $values ) {
|
|
return $this->buildSuperlative( 'GREATEST', $fields, $values );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function buildLeast( $fields, $values ) {
|
|
return $this->buildSuperlative( 'LEAST', $fields, $values );
|
|
}
|
|
|
|
/**
|
|
* Build a superlative function statement comparing columns/values
|
|
*
|
|
* Integer and float values in $values will not be quoted
|
|
*
|
|
* If $fields is an array, then each value with a string key is treated as an expression
|
|
* (which must be manually quoted); such string keys do not appear in the SQL and are only
|
|
* descriptive aliases.
|
|
*
|
|
* @stable to override
|
|
* @param string $sqlfunc Name of a SQL function
|
|
* @param string|string[] $fields Name(s) of column(s) with values to compare
|
|
* @param string|int|float|string[]|int[]|float[] $values Values to compare
|
|
* @return mixed
|
|
* @since 1.35
|
|
*/
|
|
protected function buildSuperlative( $sqlfunc, $fields, $values ) {
|
|
$fields = is_array( $fields ) ? $fields : [ $fields ];
|
|
$values = is_array( $values ) ? $values : [ $values ];
|
|
|
|
$encValues = [];
|
|
foreach ( $fields as $alias => $field ) {
|
|
if ( is_int( $alias ) ) {
|
|
$encValues[] = $this->addIdentifierQuotes( $field );
|
|
} else {
|
|
$encValues[] = $field; // expression
|
|
}
|
|
}
|
|
foreach ( $values as $value ) {
|
|
if ( is_int( $value ) || is_float( $value ) ) {
|
|
$encValues[] = $value;
|
|
} elseif ( is_string( $value ) ) {
|
|
$encValues[] = $this->addQuotes( $value );
|
|
} elseif ( $value === null ) {
|
|
throw new DBUnexpectedError( $this, 'Null value in superlative' );
|
|
} else {
|
|
throw new DBUnexpectedError( $this, 'Unexpected value type in superlative' );
|
|
}
|
|
}
|
|
|
|
return $sqlfunc . '(' . implode( ',', $encValues ) . ')';
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function buildSubstring( $input, $startPosition, $length = null ) {
|
|
$this->assertBuildSubstringParams( $startPosition, $length );
|
|
$functionBody = "$input FROM $startPosition";
|
|
if ( $length !== null ) {
|
|
$functionBody .= " FOR $length";
|
|
}
|
|
return 'SUBSTRING(' . $functionBody . ')';
|
|
}
|
|
|
|
/**
|
|
* Check type and bounds for parameters to self::buildSubstring()
|
|
*
|
|
* All supported databases have substring functions that behave the same for
|
|
* positive $startPosition and non-negative $length, but behaviors differ when
|
|
* given negative $startPosition or negative $length. The simplest
|
|
* solution to that is to just forbid those values.
|
|
*
|
|
* @param int $startPosition
|
|
* @param int|null $length
|
|
* @since 1.31
|
|
*/
|
|
protected function assertBuildSubstringParams( $startPosition, $length ) {
|
|
if ( $startPosition === 0 ) {
|
|
// The DBMSs we support use 1-based indexing here.
|
|
throw new InvalidArgumentException( 'Use 1 as $startPosition for the beginning of the string' );
|
|
}
|
|
if ( !is_int( $startPosition ) || $startPosition < 0 ) {
|
|
throw new InvalidArgumentException(
|
|
'$startPosition must be a positive integer'
|
|
);
|
|
}
|
|
if ( !( is_int( $length ) && $length >= 0 || $length === null ) ) {
|
|
throw new InvalidArgumentException(
|
|
'$length must be null or an integer greater than or equal to 0'
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check type and bounds conditions parameters for update
|
|
*
|
|
* In order to prevent possible performance or replication issues,
|
|
* empty condition for 'update' and 'delete' queries isn't allowed
|
|
*
|
|
* @param array|string $conds conditions to be validated on emptiness
|
|
* @param string $fname caller's function name to be passed to exception
|
|
* @param bool $deprecate define the assertion type. If true then
|
|
* wfDeprecated will be called, otherwise DBUnexpectedError will be
|
|
* raised.
|
|
* @since 1.35
|
|
*/
|
|
protected function assertConditionIsNotEmpty( $conds, string $fname, bool $deprecate ) {
|
|
$isCondValid = ( is_string( $conds ) || is_array( $conds ) ) && $conds;
|
|
if ( !$isCondValid ) {
|
|
if ( $deprecate ) {
|
|
wfDeprecated( $fname . ' called with empty $conds', '1.35', false, 3 );
|
|
} else {
|
|
throw new DBUnexpectedError( $this, $fname . ' called with empty conditions' );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function buildStringCast( $field ) {
|
|
// In theory this should work for any standards-compliant
|
|
// SQL implementation, although it may not be the best way to do it.
|
|
return "CAST( $field AS CHARACTER )";
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function buildIntegerCast( $field ) {
|
|
return 'CAST( ' . $field . ' AS INTEGER )';
|
|
}
|
|
|
|
public function buildSelectSubquery(
|
|
$table, $vars, $conds = '', $fname = __METHOD__,
|
|
$options = [], $join_conds = []
|
|
) {
|
|
return new Subquery(
|
|
$this->selectSQLText( $table, $vars, $conds, $fname, $options, $join_conds )
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function databasesAreIndependent() {
|
|
return false;
|
|
}
|
|
|
|
final public function selectDB( $db ) {
|
|
$this->selectDomain( new DatabaseDomain(
|
|
$db,
|
|
$this->currentDomain->getSchema(),
|
|
$this->currentDomain->getTablePrefix()
|
|
) );
|
|
|
|
return true;
|
|
}
|
|
|
|
final public function selectDomain( $domain ) {
|
|
$this->doSelectDomain( DatabaseDomain::newFromId( $domain ) );
|
|
}
|
|
|
|
/**
|
|
* @stable to override
|
|
* @param DatabaseDomain $domain
|
|
* @throws DBConnectionError
|
|
* @throws DBError
|
|
* @since 1.32
|
|
*/
|
|
protected function doSelectDomain( DatabaseDomain $domain ) {
|
|
$this->currentDomain = $domain;
|
|
}
|
|
|
|
public function getDBname() {
|
|
return $this->currentDomain->getDatabase();
|
|
}
|
|
|
|
public function getServer() {
|
|
return $this->server;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function tableName( $name, $format = 'quoted' ) {
|
|
if ( $name instanceof Subquery ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
__METHOD__ . ': got Subquery instance when expecting a string'
|
|
);
|
|
}
|
|
|
|
# Skip the entire process when we have a string quoted on both ends.
|
|
# Note that we check the end so that we will still quote any use of
|
|
# use of `database`.table. But won't break things if someone wants
|
|
# to query a database table with a dot in the name.
|
|
if ( $this->isQuotedIdentifier( $name ) ) {
|
|
return $name;
|
|
}
|
|
|
|
# Lets test for any bits of text that should never show up in a table
|
|
# name. Basically anything like JOIN or ON which are actually part of
|
|
# SQL queries, but may end up inside of the table value to combine
|
|
# sql. Such as how the API is doing.
|
|
# Note that we use a whitespace test rather than a \b test to avoid
|
|
# any remote case where a word like on may be inside of a table name
|
|
# surrounded by symbols which may be considered word breaks.
|
|
if ( preg_match( '/(^|\s)(DISTINCT|JOIN|ON|AS)(\s|$)/i', $name ) !== 0 ) {
|
|
$this->queryLogger->warning(
|
|
__METHOD__ . ": use of subqueries is not supported this way",
|
|
[ 'exception' => new RuntimeException() ]
|
|
);
|
|
|
|
return $name;
|
|
}
|
|
|
|
# Split database and table into proper variables.
|
|
list( $database, $schema, $prefix, $table ) = $this->qualifiedTableComponents( $name );
|
|
|
|
# Quote $table and apply the prefix if not quoted.
|
|
# $tableName might be empty if this is called from Database::replaceVars()
|
|
$tableName = "{$prefix}{$table}";
|
|
if ( $format === 'quoted'
|
|
&& !$this->isQuotedIdentifier( $tableName )
|
|
&& $tableName !== ''
|
|
) {
|
|
$tableName = $this->addIdentifierQuotes( $tableName );
|
|
}
|
|
|
|
# Quote $schema and $database and merge them with the table name if needed
|
|
$tableName = $this->prependDatabaseOrSchema( $schema, $tableName, $format );
|
|
$tableName = $this->prependDatabaseOrSchema( $database, $tableName, $format );
|
|
|
|
return $tableName;
|
|
}
|
|
|
|
/**
|
|
* Get the table components needed for a query given the currently selected database
|
|
*
|
|
* @param string $name Table name in the form of db.schema.table, db.table, or table
|
|
* @return array (DB name or "" for default, schema name, table prefix, table name)
|
|
*/
|
|
protected function qualifiedTableComponents( $name ) {
|
|
# We reverse the explode so that database.table and table both output the correct table.
|
|
$dbDetails = explode( '.', $name, 3 );
|
|
if ( count( $dbDetails ) == 3 ) {
|
|
list( $database, $schema, $table ) = $dbDetails;
|
|
# We don't want any prefix added in this case
|
|
$prefix = '';
|
|
} elseif ( count( $dbDetails ) == 2 ) {
|
|
list( $database, $table ) = $dbDetails;
|
|
# We don't want any prefix added in this case
|
|
$prefix = '';
|
|
# In dbs that support it, $database may actually be the schema
|
|
# but that doesn't affect any of the functionality here
|
|
$schema = '';
|
|
} else {
|
|
list( $table ) = $dbDetails;
|
|
if ( isset( $this->tableAliases[$table] ) ) {
|
|
$database = $this->tableAliases[$table]['dbname'];
|
|
$schema = is_string( $this->tableAliases[$table]['schema'] )
|
|
? $this->tableAliases[$table]['schema']
|
|
: $this->relationSchemaQualifier();
|
|
$prefix = is_string( $this->tableAliases[$table]['prefix'] )
|
|
? $this->tableAliases[$table]['prefix']
|
|
: $this->tablePrefix();
|
|
} else {
|
|
$database = '';
|
|
$schema = $this->relationSchemaQualifier(); # Default schema
|
|
$prefix = $this->tablePrefix(); # Default prefix
|
|
}
|
|
}
|
|
|
|
return [ $database, $schema, $prefix, $table ];
|
|
}
|
|
|
|
/**
|
|
* @param string|null $namespace Database or schema
|
|
* @param string $relation Name of table, view, sequence, etc...
|
|
* @param string $format One of (raw, quoted)
|
|
* @return string Relation name with quoted and merged $namespace as needed
|
|
*/
|
|
private function prependDatabaseOrSchema( $namespace, $relation, $format ) {
|
|
if ( strlen( $namespace ) ) {
|
|
if ( $format === 'quoted' && !$this->isQuotedIdentifier( $namespace ) ) {
|
|
$namespace = $this->addIdentifierQuotes( $namespace );
|
|
}
|
|
$relation = $namespace . '.' . $relation;
|
|
}
|
|
|
|
return $relation;
|
|
}
|
|
|
|
public function tableNames( ...$tables ) {
|
|
$retVal = [];
|
|
|
|
foreach ( $tables as $name ) {
|
|
$retVal[$name] = $this->tableName( $name );
|
|
}
|
|
|
|
return $retVal;
|
|
}
|
|
|
|
public function tableNamesN( ...$tables ) {
|
|
$retVal = [];
|
|
|
|
foreach ( $tables as $name ) {
|
|
$retVal[] = $this->tableName( $name );
|
|
}
|
|
|
|
return $retVal;
|
|
}
|
|
|
|
/**
|
|
* Get an aliased table name
|
|
*
|
|
* This returns strings like "tableName AS newTableName" for aliased tables
|
|
* and "(SELECT * from tableA) newTablename" for subqueries (e.g. derived tables)
|
|
*
|
|
* @see Database::tableName()
|
|
* @param string|Subquery $table Table name or object with a 'sql' field
|
|
* @param string|bool $alias Table alias (optional)
|
|
* @return string SQL name for aliased table. Will not alias a table to its own name
|
|
*/
|
|
protected function tableNameWithAlias( $table, $alias = false ) {
|
|
if ( is_string( $table ) ) {
|
|
$quotedTable = $this->tableName( $table );
|
|
} elseif ( $table instanceof Subquery ) {
|
|
$quotedTable = (string)$table;
|
|
} else {
|
|
throw new InvalidArgumentException( "Table must be a string or Subquery" );
|
|
}
|
|
|
|
if ( $alias === false || $alias === $table ) {
|
|
if ( $table instanceof Subquery ) {
|
|
throw new InvalidArgumentException( "Subquery table missing alias" );
|
|
}
|
|
|
|
return $quotedTable;
|
|
} else {
|
|
return $quotedTable . ' ' . $this->addIdentifierQuotes( $alias );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get an aliased field name
|
|
* e.g. fieldName AS newFieldName
|
|
*
|
|
* @stable to override
|
|
* @param string $name Field name
|
|
* @param string|bool $alias Alias (optional)
|
|
* @return string SQL name for aliased field. Will not alias a field to its own name
|
|
*/
|
|
protected function fieldNameWithAlias( $name, $alias = false ) {
|
|
if ( !$alias || (string)$alias === (string)$name ) {
|
|
return $name;
|
|
} else {
|
|
return $name . ' AS ' . $this->addIdentifierQuotes( $alias ); // PostgreSQL needs AS
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets an array of aliased field names
|
|
*
|
|
* @param array $fields [ [alias] => field ]
|
|
* @return string[] See fieldNameWithAlias()
|
|
*/
|
|
protected function fieldNamesWithAlias( $fields ) {
|
|
$retval = [];
|
|
foreach ( $fields as $alias => $field ) {
|
|
if ( is_numeric( $alias ) ) {
|
|
$alias = $field;
|
|
}
|
|
$retval[] = $this->fieldNameWithAlias( $field, $alias );
|
|
}
|
|
|
|
return $retval;
|
|
}
|
|
|
|
/**
|
|
* Get the aliased table name clause for a FROM clause
|
|
* which might have a JOIN and/or USE INDEX or IGNORE INDEX clause
|
|
*
|
|
* @param array $tables ( [alias] => table )
|
|
* @param array $use_index Same as for select()
|
|
* @param array $ignore_index Same as for select()
|
|
* @param array $join_conds Same as for select()
|
|
* @return string
|
|
*/
|
|
protected function tableNamesWithIndexClauseOrJOIN(
|
|
$tables,
|
|
$use_index = [],
|
|
$ignore_index = [],
|
|
$join_conds = []
|
|
) {
|
|
$ret = [];
|
|
$retJOIN = [];
|
|
$use_index = (array)$use_index;
|
|
$ignore_index = (array)$ignore_index;
|
|
$join_conds = (array)$join_conds;
|
|
|
|
foreach ( $tables as $alias => $table ) {
|
|
if ( !is_string( $alias ) ) {
|
|
// No alias? Set it equal to the table name
|
|
$alias = $table;
|
|
}
|
|
|
|
if ( is_array( $table ) ) {
|
|
// A parenthesized group
|
|
if ( count( $table ) > 1 ) {
|
|
$joinedTable = '(' .
|
|
$this->tableNamesWithIndexClauseOrJOIN(
|
|
$table, $use_index, $ignore_index, $join_conds ) . ')';
|
|
} else {
|
|
// Degenerate case
|
|
$innerTable = reset( $table );
|
|
$innerAlias = key( $table );
|
|
$joinedTable = $this->tableNameWithAlias(
|
|
$innerTable,
|
|
is_string( $innerAlias ) ? $innerAlias : $innerTable
|
|
);
|
|
}
|
|
} else {
|
|
$joinedTable = $this->tableNameWithAlias( $table, $alias );
|
|
}
|
|
|
|
// Is there a JOIN clause for this table?
|
|
if ( isset( $join_conds[$alias] ) ) {
|
|
list( $joinType, $conds ) = $join_conds[$alias];
|
|
$tableClause = $joinType;
|
|
$tableClause .= ' ' . $joinedTable;
|
|
if ( isset( $use_index[$alias] ) ) { // has USE INDEX?
|
|
$use = $this->useIndexClause( implode( ',', (array)$use_index[$alias] ) );
|
|
if ( $use != '' ) {
|
|
$tableClause .= ' ' . $use;
|
|
}
|
|
}
|
|
if ( isset( $ignore_index[$alias] ) ) { // has IGNORE INDEX?
|
|
$ignore = $this->ignoreIndexClause(
|
|
implode( ',', (array)$ignore_index[$alias] ) );
|
|
if ( $ignore != '' ) {
|
|
$tableClause .= ' ' . $ignore;
|
|
}
|
|
}
|
|
$on = $this->makeList( (array)$conds, self::LIST_AND );
|
|
if ( $on != '' ) {
|
|
$tableClause .= ' ON (' . $on . ')';
|
|
}
|
|
|
|
$retJOIN[] = $tableClause;
|
|
} elseif ( isset( $use_index[$alias] ) ) {
|
|
// Is there an INDEX clause for this table?
|
|
$tableClause = $joinedTable;
|
|
$tableClause .= ' ' . $this->useIndexClause(
|
|
implode( ',', (array)$use_index[$alias] )
|
|
);
|
|
|
|
$ret[] = $tableClause;
|
|
} elseif ( isset( $ignore_index[$alias] ) ) {
|
|
// Is there an INDEX clause for this table?
|
|
$tableClause = $joinedTable;
|
|
$tableClause .= ' ' . $this->ignoreIndexClause(
|
|
implode( ',', (array)$ignore_index[$alias] )
|
|
);
|
|
|
|
$ret[] = $tableClause;
|
|
} else {
|
|
$tableClause = $joinedTable;
|
|
|
|
$ret[] = $tableClause;
|
|
}
|
|
}
|
|
|
|
// We can't separate explicit JOIN clauses with ',', use ' ' for those
|
|
$implicitJoins = implode( ',', $ret );
|
|
$explicitJoins = implode( ' ', $retJOIN );
|
|
|
|
// Compile our final table clause
|
|
return implode( ' ', [ $implicitJoins, $explicitJoins ] );
|
|
}
|
|
|
|
/**
|
|
* Allows for index remapping in queries where this is not consistent across DBMS
|
|
*
|
|
* @param string $index
|
|
* @return string
|
|
*/
|
|
protected function indexName( $index ) {
|
|
return $this->indexAliases[$index] ?? $index;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function addQuotes( $s ) {
|
|
if ( $s instanceof Blob ) {
|
|
$s = $s->fetch();
|
|
}
|
|
if ( $s === null ) {
|
|
return 'NULL';
|
|
} elseif ( is_bool( $s ) ) {
|
|
return (string)(int)$s;
|
|
} elseif ( is_int( $s ) ) {
|
|
return (string)$s;
|
|
} else {
|
|
return "'" . $this->strencode( $s ) . "'";
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function addIdentifierQuotes( $s ) {
|
|
return '"' . str_replace( '"', '""', $s ) . '"';
|
|
}
|
|
|
|
/**
|
|
* Returns if the given identifier looks quoted or not according to
|
|
* the database convention for quoting identifiers
|
|
*
|
|
* @stable to override
|
|
* @note Do not use this to determine if untrusted input is safe.
|
|
* A malicious user can trick this function.
|
|
* @param string $name
|
|
* @return bool
|
|
*/
|
|
public function isQuotedIdentifier( $name ) {
|
|
return $name[0] == '"' && substr( $name, -1, 1 ) == '"';
|
|
}
|
|
|
|
/**
|
|
* @stable to override
|
|
* @param string $s
|
|
* @param string $escapeChar
|
|
* @return string
|
|
*/
|
|
protected function escapeLikeInternal( $s, $escapeChar = '`' ) {
|
|
return str_replace(
|
|
[ $escapeChar, '%', '_' ],
|
|
[ "{$escapeChar}{$escapeChar}", "{$escapeChar}%", "{$escapeChar}_" ],
|
|
$s
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function buildLike( $param, ...$params ) {
|
|
if ( is_array( $param ) ) {
|
|
$params = $param;
|
|
} else {
|
|
$params = func_get_args();
|
|
}
|
|
|
|
$s = '';
|
|
|
|
// We use ` instead of \ as the default LIKE escape character, since addQuotes()
|
|
// may escape backslashes, creating problems of double escaping. The `
|
|
// character has good cross-DBMS compatibility, avoiding special operators
|
|
// in MS SQL like ^ and %
|
|
$escapeChar = '`';
|
|
|
|
foreach ( $params as $value ) {
|
|
if ( $value instanceof LikeMatch ) {
|
|
$s .= $value->toString();
|
|
} else {
|
|
$s .= $this->escapeLikeInternal( $value, $escapeChar );
|
|
}
|
|
}
|
|
|
|
return ' LIKE ' .
|
|
$this->addQuotes( $s ) . ' ESCAPE ' . $this->addQuotes( $escapeChar ) . ' ';
|
|
}
|
|
|
|
public function anyChar() {
|
|
return new LikeMatch( '_' );
|
|
}
|
|
|
|
public function anyString() {
|
|
return new LikeMatch( '%' );
|
|
}
|
|
|
|
public function nextSequenceValue( $seqName ) {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* USE INDEX clause.
|
|
*
|
|
* This can be used as optimisation in queries that affect tables with multiple
|
|
* indexes if the database does not pick the most optimal one by default.
|
|
* The "right" index might vary between database backends and versions thereof,
|
|
* as such in practice this is biased toward specifically improving performance
|
|
* of large wiki farms that use MySQL or MariaDB (like Wikipedia).
|
|
*
|
|
* @stable to override
|
|
* @param string $index
|
|
* @return string
|
|
*/
|
|
public function useIndexClause( $index ) {
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* IGNORE INDEX clause.
|
|
*
|
|
* The inverse of Database::useIndexClause.
|
|
*
|
|
* @stable to override
|
|
* @param string $index
|
|
* @return string
|
|
*/
|
|
public function ignoreIndexClause( $index ) {
|
|
return '';
|
|
}
|
|
|
|
public function replace( $table, $uniqueKeys, $rows, $fname = __METHOD__ ) {
|
|
$rows = $this->normalizeRowArray( $rows );
|
|
if ( !$rows ) {
|
|
return;
|
|
}
|
|
|
|
if ( $uniqueKeys ) {
|
|
$uniqueKeys = $this->normalizeUpsertKeys( $uniqueKeys );
|
|
$this->doReplace( $table, $uniqueKeys, $rows, $fname );
|
|
} else {
|
|
$this->queryLogger->warning(
|
|
__METHOD__ . " called with no unique keys",
|
|
[ 'exception' => new RuntimeException() ]
|
|
);
|
|
$this->doInsert( $table, $rows, $fname );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @see Database::replace()
|
|
* @stable to override
|
|
* @param string $table
|
|
* @param string[][] $uniqueKeys Non-empty list of unique keys
|
|
* @param array $rows Non-empty list of rows
|
|
* @param string $fname
|
|
* @since 1.35
|
|
*/
|
|
protected function doReplace( $table, array $uniqueKeys, array $rows, $fname ) {
|
|
$affectedRowCount = 0;
|
|
$this->startAtomic( $fname, self::ATOMIC_CANCELABLE );
|
|
try {
|
|
foreach ( $rows as $row ) {
|
|
// Delete any conflicting rows (including ones inserted from $rows)
|
|
$sqlCondition = $this->makeConditionCollidesUponKeys( [ $row ], $uniqueKeys );
|
|
$this->delete( $table, [ $sqlCondition ], $fname );
|
|
$affectedRowCount += $this->affectedRows();
|
|
// Now insert the row
|
|
$this->insert( $table, $row, $fname );
|
|
$affectedRowCount += $this->affectedRows();
|
|
}
|
|
$this->endAtomic( $fname );
|
|
} catch ( Throwable $e ) {
|
|
$this->cancelAtomic( $fname );
|
|
throw $e;
|
|
}
|
|
$this->affectedRowCount = $affectedRowCount;
|
|
}
|
|
|
|
/**
|
|
* @param array[] $rows Non-empty list of rows
|
|
* @param string[] $uniqueKey List of columns that define a single unique index
|
|
* @return string SQL conditions to filter existing rows to those with counterparts in $rows
|
|
*/
|
|
private function makeConditionCollidesUponKey( array $rows, array $uniqueKey ) {
|
|
if ( !$rows ) {
|
|
throw new DBUnexpectedError( $this, "Empty row array" );
|
|
} elseif ( !$uniqueKey ) {
|
|
throw new DBUnexpectedError( $this, "Empty unique key array" );
|
|
}
|
|
|
|
if ( count( $uniqueKey ) == 1 ) {
|
|
// Use a simple IN(...) clause
|
|
$column = reset( $uniqueKey );
|
|
$values = array_column( $rows, $column );
|
|
if ( count( $values ) !== count( $rows ) ) {
|
|
throw new DBUnexpectedError( $this, "Missing values for unique key ($column)" );
|
|
}
|
|
|
|
return $this->makeList( [ $column => $values ], self::LIST_AND );
|
|
}
|
|
|
|
$disjunctions = [];
|
|
foreach ( $rows as $row ) {
|
|
$rowKeyMap = array_intersect_key( $row, array_flip( $uniqueKey ) );
|
|
if ( count( $rowKeyMap ) != count( $uniqueKey ) ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"Missing values for unique key (" . implode( ',', $uniqueKey ) . ")"
|
|
);
|
|
}
|
|
$disjunctions[] = $this->makeList( $rowKeyMap, self::LIST_AND );
|
|
}
|
|
|
|
return count( $disjunctions ) > 1
|
|
? $this->makeList( $disjunctions, self::LIST_OR )
|
|
: $disjunctions[0];
|
|
}
|
|
|
|
/**
|
|
* @param array[] $rows Non-empty list of rows
|
|
* @param string[][] $uniqueKeys List of column lists that each define a unique index
|
|
* @return string SQL conditions to filter existing rows to those with counterparts in $rows
|
|
* @since 1.35
|
|
*/
|
|
final protected function makeConditionCollidesUponKeys( array $rows, array $uniqueKeys ) {
|
|
if ( !$uniqueKeys ) {
|
|
throw new DBUnexpectedError( $this, "Empty unique key array" );
|
|
}
|
|
|
|
$disjunctions = [];
|
|
foreach ( $uniqueKeys as $uniqueKey ) {
|
|
$disjunctions[] = $this->makeConditionCollidesUponKey( $rows, $uniqueKey );
|
|
}
|
|
|
|
return count( $disjunctions ) > 1
|
|
? $this->makeList( $disjunctions, self::LIST_OR )
|
|
: $disjunctions[0];
|
|
}
|
|
|
|
public function upsert( $table, array $rows, $uniqueKeys, array $set, $fname = __METHOD__ ) {
|
|
$rows = $this->normalizeRowArray( $rows );
|
|
if ( !$rows ) {
|
|
return true;
|
|
}
|
|
|
|
if ( $uniqueKeys ) {
|
|
$uniqueKeys = $this->normalizeUpsertKeys( $uniqueKeys );
|
|
$this->doUpsert( $table, $rows, $uniqueKeys, $set, $fname );
|
|
} else {
|
|
$this->queryLogger->warning(
|
|
__METHOD__ . " called with no unique keys",
|
|
[ 'exception' => new RuntimeException() ]
|
|
);
|
|
$this->doInsert( $table, $rows, $fname );
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @see Database::upsert()
|
|
* @stable to override
|
|
* @param string $table
|
|
* @param array[] $rows Non-empty list of rows
|
|
* @param string[][] $uniqueKeys Non-empty list of unique keys
|
|
* @param array $set
|
|
* @param string $fname
|
|
* @since 1.35
|
|
*/
|
|
protected function doUpsert( $table, array $rows, array $uniqueKeys, array $set, $fname ) {
|
|
$affectedRowCount = 0;
|
|
$this->startAtomic( $fname, self::ATOMIC_CANCELABLE );
|
|
try {
|
|
foreach ( $rows as $row ) {
|
|
// Update any existing conflicting rows (including ones inserted from $rows)
|
|
$sqlConditions = $this->makeConditionCollidesUponKeys( [ $row ], $uniqueKeys );
|
|
$this->update( $table, $set, [ $sqlConditions ], $fname );
|
|
$rowsUpdated = $this->affectedRows();
|
|
$affectedRowCount += $rowsUpdated;
|
|
if ( $rowsUpdated <= 0 ) {
|
|
// Now insert the row if there are no conflicts
|
|
$this->insert( $table, $row, $fname );
|
|
$affectedRowCount += $this->affectedRows();
|
|
}
|
|
}
|
|
$this->endAtomic( $fname );
|
|
} catch ( Throwable $e ) {
|
|
$this->cancelAtomic( $fname );
|
|
throw $e;
|
|
}
|
|
$this->affectedRowCount = $affectedRowCount;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function deleteJoin(
|
|
$delTable,
|
|
$joinTable,
|
|
$delVar,
|
|
$joinVar,
|
|
$conds,
|
|
$fname = __METHOD__
|
|
) {
|
|
if ( !$conds ) {
|
|
throw new DBUnexpectedError( $this, __METHOD__ . ' called with empty $conds' );
|
|
}
|
|
|
|
$delTable = $this->tableName( $delTable );
|
|
$joinTable = $this->tableName( $joinTable );
|
|
$sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
|
|
if ( $conds != '*' ) {
|
|
$sql .= 'WHERE ' . $this->makeList( $conds, self::LIST_AND );
|
|
}
|
|
$sql .= ')';
|
|
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_ROWS );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function textFieldSize( $table, $field ) {
|
|
$table = $this->tableName( $table );
|
|
$sql = "SHOW COLUMNS FROM $table LIKE \"$field\"";
|
|
$res = $this->query( $sql, __METHOD__, self::QUERY_CHANGE_NONE );
|
|
$row = $this->fetchObject( $res );
|
|
|
|
$m = [];
|
|
|
|
if ( preg_match( '/\((.*)\)/', $row->Type, $m ) ) {
|
|
$size = $m[1];
|
|
} else {
|
|
$size = -1;
|
|
}
|
|
|
|
return $size;
|
|
}
|
|
|
|
public function delete( $table, $conds, $fname = __METHOD__ ) {
|
|
$this->assertConditionIsNotEmpty( $conds, __METHOD__, false );
|
|
|
|
$table = $this->tableName( $table );
|
|
$sql = "DELETE FROM $table";
|
|
|
|
if ( $conds !== IDatabase::ALL_ROWS ) {
|
|
if ( is_array( $conds ) ) {
|
|
$conds = $this->makeList( $conds, self::LIST_AND );
|
|
}
|
|
$sql .= ' WHERE ' . $conds;
|
|
}
|
|
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_ROWS );
|
|
|
|
return true;
|
|
}
|
|
|
|
final public function insertSelect(
|
|
$destTable,
|
|
$srcTable,
|
|
$varMap,
|
|
$conds,
|
|
$fname = __METHOD__,
|
|
$insertOptions = [],
|
|
$selectOptions = [],
|
|
$selectJoinConds = []
|
|
) {
|
|
static $hints = [ 'NO_AUTO_COLUMNS' ];
|
|
|
|
$insertOptions = $this->normalizeOptions( $insertOptions );
|
|
$selectOptions = $this->normalizeOptions( $selectOptions );
|
|
|
|
if ( $this->cliMode && $this->isInsertSelectSafe( $insertOptions, $selectOptions ) ) {
|
|
// For massive migrations with downtime, we don't want to select everything
|
|
// into memory and OOM, so do all this native on the server side if possible.
|
|
$this->doInsertSelectNative(
|
|
$destTable,
|
|
$srcTable,
|
|
$varMap,
|
|
$conds,
|
|
$fname,
|
|
array_diff( $insertOptions, $hints ),
|
|
$selectOptions,
|
|
$selectJoinConds
|
|
);
|
|
} else {
|
|
$this->doInsertSelectGeneric(
|
|
$destTable,
|
|
$srcTable,
|
|
$varMap,
|
|
$conds,
|
|
$fname,
|
|
array_diff( $insertOptions, $hints ),
|
|
$selectOptions,
|
|
$selectJoinConds
|
|
);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @stable to override
|
|
* @param array $insertOptions INSERT options
|
|
* @param array $selectOptions SELECT options
|
|
* @return bool Whether an INSERT SELECT with these options will be replication safe
|
|
* @since 1.31
|
|
*/
|
|
protected function isInsertSelectSafe( array $insertOptions, array $selectOptions ) {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Implementation of insertSelect() based on select() and insert()
|
|
*
|
|
* @see IDatabase::insertSelect()
|
|
* @param string $destTable
|
|
* @param string|array $srcTable
|
|
* @param array $varMap
|
|
* @param array $conds
|
|
* @param string $fname
|
|
* @param array $insertOptions
|
|
* @param array $selectOptions
|
|
* @param array $selectJoinConds
|
|
* @since 1.35
|
|
*/
|
|
protected function doInsertSelectGeneric(
|
|
$destTable,
|
|
$srcTable,
|
|
array $varMap,
|
|
$conds,
|
|
$fname,
|
|
array $insertOptions,
|
|
array $selectOptions,
|
|
$selectJoinConds
|
|
) {
|
|
// For web requests, do a locking SELECT and then INSERT. This puts the SELECT burden
|
|
// on only the master (without needing row-based-replication). It also makes it easy to
|
|
// know how big the INSERT is going to be.
|
|
$fields = [];
|
|
foreach ( $varMap as $dstColumn => $sourceColumnOrSql ) {
|
|
$fields[] = $this->fieldNameWithAlias( $sourceColumnOrSql, $dstColumn );
|
|
}
|
|
$res = $this->select(
|
|
$srcTable,
|
|
implode( ',', $fields ),
|
|
$conds,
|
|
$fname,
|
|
array_merge( $selectOptions, [ 'FOR UPDATE' ] ),
|
|
$selectJoinConds
|
|
);
|
|
if ( !$res ) {
|
|
return;
|
|
}
|
|
|
|
$affectedRowCount = 0;
|
|
$this->startAtomic( $fname, self::ATOMIC_CANCELABLE );
|
|
try {
|
|
$rows = [];
|
|
foreach ( $res as $row ) {
|
|
$rows[] = (array)$row;
|
|
}
|
|
// Avoid inserts that are too huge
|
|
$rowBatches = array_chunk( $rows, $this->nonNativeInsertSelectBatchSize );
|
|
foreach ( $rowBatches as $rows ) {
|
|
$this->insert( $destTable, $rows, $fname, $insertOptions );
|
|
$affectedRowCount += $this->affectedRows();
|
|
}
|
|
} catch ( Throwable $e ) {
|
|
$this->cancelAtomic( $fname );
|
|
throw $e;
|
|
}
|
|
$this->endAtomic( $fname );
|
|
$this->affectedRowCount = $affectedRowCount;
|
|
}
|
|
|
|
/**
|
|
* Native server-side implementation of insertSelect() for situations where
|
|
* we don't want to select everything into memory
|
|
*
|
|
* @see IDatabase::insertSelect()
|
|
* @param string $destTable
|
|
* @param string|array $srcTable
|
|
* @param array $varMap
|
|
* @param array $conds
|
|
* @param string $fname
|
|
* @param array $insertOptions
|
|
* @param array $selectOptions
|
|
* @param array $selectJoinConds
|
|
* @since 1.35
|
|
*/
|
|
protected function doInsertSelectNative(
|
|
$destTable,
|
|
$srcTable,
|
|
array $varMap,
|
|
$conds,
|
|
$fname,
|
|
array $insertOptions,
|
|
array $selectOptions,
|
|
$selectJoinConds
|
|
) {
|
|
list( $sqlVerb, $sqlOpts ) = $this->isFlagInOptions( 'IGNORE', $insertOptions )
|
|
? $this->makeInsertNonConflictingVerbAndOptions()
|
|
: [ 'INSERT INTO', '' ];
|
|
$encDstTable = $this->tableName( $destTable );
|
|
$sqlDstColumns = implode( ',', array_keys( $varMap ) );
|
|
$selectSql = $this->selectSQLText(
|
|
$srcTable,
|
|
array_values( $varMap ),
|
|
$conds,
|
|
$fname,
|
|
$selectOptions,
|
|
$selectJoinConds
|
|
);
|
|
|
|
$sql = rtrim( "$sqlVerb $encDstTable ($sqlDstColumns) $selectSql $sqlOpts" );
|
|
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_ROWS );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function limitResult( $sql, $limit, $offset = false ) {
|
|
if ( !is_numeric( $limit ) ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"Invalid non-numeric limit passed to " . __METHOD__
|
|
);
|
|
}
|
|
// This version works in MySQL and SQLite. It will very likely need to be
|
|
// overridden for most other RDBMS subclasses.
|
|
return "$sql LIMIT "
|
|
. ( ( is_numeric( $offset ) && $offset != 0 ) ? "{$offset}," : "" )
|
|
. "{$limit} ";
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function unionSupportsOrderAndLimit() {
|
|
return true; // True for almost every DB supported
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function unionQueries( $sqls, $all ) {
|
|
$glue = $all ? ') UNION ALL (' : ') UNION (';
|
|
|
|
return '(' . implode( $glue, $sqls ) . ')';
|
|
}
|
|
|
|
public function unionConditionPermutations(
|
|
$table,
|
|
$vars,
|
|
array $permute_conds,
|
|
$extra_conds = '',
|
|
$fname = __METHOD__,
|
|
$options = [],
|
|
$join_conds = []
|
|
) {
|
|
// First, build the Cartesian product of $permute_conds
|
|
$conds = [ [] ];
|
|
foreach ( $permute_conds as $field => $values ) {
|
|
if ( !$values ) {
|
|
// Skip empty $values
|
|
continue;
|
|
}
|
|
$values = array_unique( $values ); // For sanity
|
|
$newConds = [];
|
|
foreach ( $conds as $cond ) {
|
|
foreach ( $values as $value ) {
|
|
$cond[$field] = $value;
|
|
$newConds[] = $cond; // Arrays are by-value, not by-reference, so this works
|
|
}
|
|
}
|
|
$conds = $newConds;
|
|
}
|
|
|
|
$extra_conds = $extra_conds === '' ? [] : (array)$extra_conds;
|
|
|
|
// If there's just one condition and no subordering, hand off to
|
|
// selectSQLText directly.
|
|
if ( count( $conds ) === 1 &&
|
|
( !isset( $options['INNER ORDER BY'] ) || !$this->unionSupportsOrderAndLimit() )
|
|
) {
|
|
return $this->selectSQLText(
|
|
$table, $vars, $conds[0] + $extra_conds, $fname, $options, $join_conds
|
|
);
|
|
}
|
|
|
|
// Otherwise, we need to pull out the order and limit to apply after
|
|
// the union. Then build the SQL queries for each set of conditions in
|
|
// $conds. Then union them together (using UNION ALL, because the
|
|
// product *should* already be distinct).
|
|
$orderBy = $this->makeOrderBy( $options );
|
|
$limit = $options['LIMIT'] ?? null;
|
|
$offset = $options['OFFSET'] ?? false;
|
|
$all = empty( $options['NOTALL'] ) && !in_array( 'NOTALL', $options );
|
|
if ( !$this->unionSupportsOrderAndLimit() ) {
|
|
unset( $options['ORDER BY'], $options['LIMIT'], $options['OFFSET'] );
|
|
} else {
|
|
if ( array_key_exists( 'INNER ORDER BY', $options ) ) {
|
|
$options['ORDER BY'] = $options['INNER ORDER BY'];
|
|
}
|
|
if ( $limit !== null && is_numeric( $offset ) && $offset != 0 ) {
|
|
// We need to increase the limit by the offset rather than
|
|
// using the offset directly, otherwise it'll skip incorrectly
|
|
// in the subqueries.
|
|
$options['LIMIT'] = $limit + $offset;
|
|
unset( $options['OFFSET'] );
|
|
}
|
|
}
|
|
|
|
$sqls = [];
|
|
foreach ( $conds as $cond ) {
|
|
$sqls[] = $this->selectSQLText(
|
|
$table, $vars, $cond + $extra_conds, $fname, $options, $join_conds
|
|
);
|
|
}
|
|
$sql = $this->unionQueries( $sqls, $all ) . $orderBy;
|
|
if ( $limit !== null ) {
|
|
$sql = $this->limitResult( $sql, $limit, $offset );
|
|
}
|
|
|
|
return $sql;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function conditional( $cond, $trueVal, $falseVal ) {
|
|
if ( is_array( $cond ) ) {
|
|
$cond = $this->makeList( $cond, self::LIST_AND );
|
|
}
|
|
|
|
return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function strreplace( $orig, $old, $new ) {
|
|
return "REPLACE({$orig}, {$old}, {$new})";
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function getServerUptime() {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function wasDeadlock() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function wasLockTimeout() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function wasConnectionLoss() {
|
|
return $this->wasConnectionError( $this->lastErrno() );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function wasReadOnlyError() {
|
|
return false;
|
|
}
|
|
|
|
public function wasErrorReissuable() {
|
|
return (
|
|
$this->wasDeadlock() ||
|
|
$this->wasLockTimeout() ||
|
|
$this->wasConnectionLoss()
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Do not use this method outside of Database/DBError classes
|
|
*
|
|
* @stable to override
|
|
* @param int|string $errno
|
|
* @return bool Whether the given query error was a connection drop
|
|
*/
|
|
public function wasConnectionError( $errno ) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @stable to override
|
|
* @return bool Whether it is known that the last query error only caused statement rollback
|
|
* @note This is for backwards compatibility for callers catching DBError exceptions in
|
|
* order to ignore problems like duplicate key errors or foriegn key violations
|
|
* @since 1.31
|
|
*/
|
|
protected function wasKnownStatementRollbackError() {
|
|
return false; // don't know; it could have caused a transaction rollback
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function deadlockLoop( ...$args ) {
|
|
$function = array_shift( $args );
|
|
$tries = self::$DEADLOCK_TRIES;
|
|
|
|
$this->begin( __METHOD__ );
|
|
|
|
$retVal = null;
|
|
/** @var Throwable $e */
|
|
$e = null;
|
|
do {
|
|
try {
|
|
$retVal = $function( ...$args );
|
|
break;
|
|
} catch ( DBQueryError $e ) {
|
|
if ( $this->wasDeadlock() ) {
|
|
// Retry after a randomized delay
|
|
usleep( mt_rand( self::$DEADLOCK_DELAY_MIN, self::$DEADLOCK_DELAY_MAX ) );
|
|
} else {
|
|
// Throw the error back up
|
|
throw $e;
|
|
}
|
|
}
|
|
} while ( --$tries > 0 );
|
|
|
|
if ( $tries <= 0 ) {
|
|
// Too many deadlocks; give up
|
|
$this->rollback( __METHOD__ );
|
|
throw $e;
|
|
} else {
|
|
$this->commit( __METHOD__ );
|
|
|
|
return $retVal;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function masterPosWait( DBMasterPos $pos, $timeout ) {
|
|
# Real waits are implemented in the subclass.
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function getReplicaPos() {
|
|
# Stub
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function getMasterPos() {
|
|
# Stub
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function serverIsReadOnly() {
|
|
return false;
|
|
}
|
|
|
|
final public function onTransactionResolution( callable $callback, $fname = __METHOD__ ) {
|
|
if ( !$this->trxLevel() ) {
|
|
throw new DBUnexpectedError( $this, "No transaction is active" );
|
|
}
|
|
$this->trxEndCallbacks[] = [ $callback, $fname, $this->currentAtomicSectionId() ];
|
|
}
|
|
|
|
final public function onTransactionCommitOrIdle( callable $callback, $fname = __METHOD__ ) {
|
|
if ( !$this->trxLevel() && $this->getTransactionRoundId() ) {
|
|
// Start an implicit transaction similar to how query() does
|
|
$this->begin( __METHOD__, self::TRANSACTION_INTERNAL );
|
|
$this->trxAutomatic = true;
|
|
}
|
|
|
|
$this->trxPostCommitOrIdleCallbacks[] = [
|
|
$callback,
|
|
$fname,
|
|
$this->currentAtomicSectionId()
|
|
];
|
|
|
|
if ( !$this->trxLevel() ) {
|
|
$this->runOnTransactionIdleCallbacks( self::TRIGGER_IDLE );
|
|
}
|
|
}
|
|
|
|
final public function onTransactionIdle( callable $callback, $fname = __METHOD__ ) {
|
|
$this->onTransactionCommitOrIdle( $callback, $fname );
|
|
}
|
|
|
|
final public function onTransactionPreCommitOrIdle( callable $callback, $fname = __METHOD__ ) {
|
|
if ( !$this->trxLevel() && $this->getTransactionRoundId() ) {
|
|
// Start an implicit transaction similar to how query() does
|
|
$this->begin( __METHOD__, self::TRANSACTION_INTERNAL );
|
|
$this->trxAutomatic = true;
|
|
}
|
|
|
|
if ( $this->trxLevel() ) {
|
|
$this->trxPreCommitOrIdleCallbacks[] = [
|
|
$callback,
|
|
$fname,
|
|
$this->currentAtomicSectionId()
|
|
];
|
|
} else {
|
|
// No transaction is active nor will start implicitly, so make one for this callback
|
|
$this->startAtomic( __METHOD__, self::ATOMIC_CANCELABLE );
|
|
try {
|
|
$callback( $this );
|
|
$this->endAtomic( __METHOD__ );
|
|
} catch ( Throwable $e ) {
|
|
$this->cancelAtomic( __METHOD__ );
|
|
throw $e;
|
|
}
|
|
}
|
|
}
|
|
|
|
final public function onAtomicSectionCancel( callable $callback, $fname = __METHOD__ ) {
|
|
if ( !$this->trxLevel() || !$this->trxAtomicLevels ) {
|
|
throw new DBUnexpectedError( $this, "No atomic section is open (got $fname)" );
|
|
}
|
|
$this->trxSectionCancelCallbacks[] = [ $callback, $fname, $this->currentAtomicSectionId() ];
|
|
}
|
|
|
|
/**
|
|
* @return AtomicSectionIdentifier|null ID of the topmost atomic section level
|
|
*/
|
|
private function currentAtomicSectionId() {
|
|
if ( $this->trxLevel() && $this->trxAtomicLevels ) {
|
|
$levelInfo = end( $this->trxAtomicLevels );
|
|
|
|
return $levelInfo[1];
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Hoist callback ownership for callbacks in a section to a parent section.
|
|
* All callbacks should have an owner that is present in trxAtomicLevels.
|
|
* @param AtomicSectionIdentifier $old
|
|
* @param AtomicSectionIdentifier $new
|
|
*/
|
|
private function reassignCallbacksForSection(
|
|
AtomicSectionIdentifier $old,
|
|
AtomicSectionIdentifier $new
|
|
) {
|
|
foreach ( $this->trxPreCommitOrIdleCallbacks as $key => $info ) {
|
|
if ( $info[2] === $old ) {
|
|
$this->trxPreCommitOrIdleCallbacks[$key][2] = $new;
|
|
}
|
|
}
|
|
foreach ( $this->trxPostCommitOrIdleCallbacks as $key => $info ) {
|
|
if ( $info[2] === $old ) {
|
|
$this->trxPostCommitOrIdleCallbacks[$key][2] = $new;
|
|
}
|
|
}
|
|
foreach ( $this->trxEndCallbacks as $key => $info ) {
|
|
if ( $info[2] === $old ) {
|
|
$this->trxEndCallbacks[$key][2] = $new;
|
|
}
|
|
}
|
|
foreach ( $this->trxSectionCancelCallbacks as $key => $info ) {
|
|
if ( $info[2] === $old ) {
|
|
$this->trxSectionCancelCallbacks[$key][2] = $new;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Update callbacks that were owned by cancelled atomic sections.
|
|
*
|
|
* Callbacks for "on commit" should never be run if they're owned by a
|
|
* section that won't be committed.
|
|
*
|
|
* Callbacks for "on resolution" need to reflect that the section was
|
|
* rolled back, even if the transaction as a whole commits successfully.
|
|
*
|
|
* Callbacks for "on section cancel" should already have been consumed,
|
|
* but errors during the cancellation itself can prevent that while still
|
|
* destroying the section. Hoist any such callbacks to the new top section,
|
|
* which we assume will itself have to be cancelled or rolled back to
|
|
* resolve the error.
|
|
*
|
|
* @param AtomicSectionIdentifier[] $sectionIds ID of an actual savepoint
|
|
* @param AtomicSectionIdentifier|null $newSectionId New top section ID.
|
|
* @throws UnexpectedValueException
|
|
*/
|
|
private function modifyCallbacksForCancel(
|
|
array $sectionIds,
|
|
AtomicSectionIdentifier $newSectionId = null
|
|
) {
|
|
// Cancel the "on commit" callbacks owned by this savepoint
|
|
$this->trxPostCommitOrIdleCallbacks = array_filter(
|
|
$this->trxPostCommitOrIdleCallbacks,
|
|
static function ( $entry ) use ( $sectionIds ) {
|
|
return !in_array( $entry[2], $sectionIds, true );
|
|
}
|
|
);
|
|
$this->trxPreCommitOrIdleCallbacks = array_filter(
|
|
$this->trxPreCommitOrIdleCallbacks,
|
|
static function ( $entry ) use ( $sectionIds ) {
|
|
return !in_array( $entry[2], $sectionIds, true );
|
|
}
|
|
);
|
|
// Make "on resolution" callbacks owned by this savepoint to perceive a rollback
|
|
foreach ( $this->trxEndCallbacks as $key => $entry ) {
|
|
if ( in_array( $entry[2], $sectionIds, true ) ) {
|
|
$callback = $entry[0];
|
|
$this->trxEndCallbacks[$key][0] = function () use ( $callback ) {
|
|
return $callback( self::TRIGGER_ROLLBACK, $this );
|
|
};
|
|
// This "on resolution" callback no longer belongs to a section.
|
|
$this->trxEndCallbacks[$key][2] = null;
|
|
}
|
|
}
|
|
// Hoist callback ownership for section cancel callbacks to the new top section
|
|
foreach ( $this->trxSectionCancelCallbacks as $key => $entry ) {
|
|
if ( in_array( $entry[2], $sectionIds, true ) ) {
|
|
$this->trxSectionCancelCallbacks[$key][2] = $newSectionId;
|
|
}
|
|
}
|
|
}
|
|
|
|
final public function setTransactionListener( $name, callable $callback = null ) {
|
|
if ( $callback ) {
|
|
$this->trxRecurringCallbacks[$name] = $callback;
|
|
} else {
|
|
unset( $this->trxRecurringCallbacks[$name] );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Whether to disable running of post-COMMIT/ROLLBACK callbacks
|
|
*
|
|
* This method should not be used outside of Database/LoadBalancer
|
|
*
|
|
* @param bool $suppress
|
|
* @since 1.28
|
|
*/
|
|
final public function setTrxEndCallbackSuppression( $suppress ) {
|
|
$this->trxEndCallbacksSuppressed = $suppress;
|
|
}
|
|
|
|
/**
|
|
* Actually consume and run any "on transaction idle/resolution" callbacks.
|
|
*
|
|
* This method should not be used outside of Database/LoadBalancer
|
|
*
|
|
* @param int $trigger IDatabase::TRIGGER_* constant
|
|
* @return int Number of callbacks attempted
|
|
* @since 1.20
|
|
* @throws Exception
|
|
*/
|
|
public function runOnTransactionIdleCallbacks( $trigger ) {
|
|
if ( $this->trxLevel() ) { // sanity
|
|
throw new DBUnexpectedError( $this, __METHOD__ . ': a transaction is still open' );
|
|
}
|
|
|
|
if ( $this->trxEndCallbacksSuppressed ) {
|
|
return 0;
|
|
}
|
|
|
|
$count = 0;
|
|
$autoTrx = $this->getFlag( self::DBO_TRX ); // automatic begin() enabled?
|
|
/** @var Throwable $e */
|
|
$e = null; // first exception
|
|
do { // callbacks may add callbacks :)
|
|
$callbacks = array_merge(
|
|
$this->trxPostCommitOrIdleCallbacks,
|
|
$this->trxEndCallbacks // include "transaction resolution" callbacks
|
|
);
|
|
$this->trxPostCommitOrIdleCallbacks = []; // consumed (and recursion guard)
|
|
$this->trxEndCallbacks = []; // consumed (recursion guard)
|
|
|
|
// Only run trxSectionCancelCallbacks on rollback, not commit.
|
|
// But always consume them.
|
|
if ( $trigger === self::TRIGGER_ROLLBACK ) {
|
|
$callbacks = array_merge( $callbacks, $this->trxSectionCancelCallbacks );
|
|
}
|
|
$this->trxSectionCancelCallbacks = []; // consumed (recursion guard)
|
|
|
|
foreach ( $callbacks as $callback ) {
|
|
++$count;
|
|
list( $phpCallback ) = $callback;
|
|
$this->clearFlag( self::DBO_TRX ); // make each query its own transaction
|
|
try {
|
|
call_user_func( $phpCallback, $trigger, $this );
|
|
} catch ( Throwable $ex ) {
|
|
call_user_func( $this->errorLogger, $ex );
|
|
$e = $e ?: $ex;
|
|
// Some callbacks may use startAtomic/endAtomic, so make sure
|
|
// their transactions are ended so other callbacks don't fail
|
|
if ( $this->trxLevel() ) {
|
|
$this->rollback( __METHOD__, self::FLUSHING_INTERNAL );
|
|
}
|
|
} finally {
|
|
if ( $autoTrx ) {
|
|
$this->setFlag( self::DBO_TRX ); // restore automatic begin()
|
|
} else {
|
|
$this->clearFlag( self::DBO_TRX ); // restore auto-commit
|
|
}
|
|
}
|
|
}
|
|
// @phan-suppress-next-line PhanImpossibleConditionInLoop
|
|
} while ( count( $this->trxPostCommitOrIdleCallbacks ) );
|
|
|
|
if ( $e instanceof Throwable ) {
|
|
throw $e; // re-throw any first exception
|
|
}
|
|
|
|
return $count;
|
|
}
|
|
|
|
/**
|
|
* Actually consume and run any "on transaction pre-commit" callbacks.
|
|
*
|
|
* This method should not be used outside of Database/LoadBalancer
|
|
*
|
|
* @since 1.22
|
|
* @return int Number of callbacks attempted
|
|
* @throws Exception
|
|
*/
|
|
public function runOnTransactionPreCommitCallbacks() {
|
|
$count = 0;
|
|
|
|
$e = null; // first exception
|
|
do { // callbacks may add callbacks :)
|
|
$callbacks = $this->trxPreCommitOrIdleCallbacks;
|
|
$this->trxPreCommitOrIdleCallbacks = []; // consumed (and recursion guard)
|
|
foreach ( $callbacks as $callback ) {
|
|
try {
|
|
++$count;
|
|
list( $phpCallback ) = $callback;
|
|
// @phan-suppress-next-line PhanUndeclaredInvokeInCallable
|
|
$phpCallback( $this );
|
|
} catch ( Throwable $ex ) {
|
|
( $this->errorLogger )( $ex );
|
|
$e = $e ?: $ex;
|
|
}
|
|
}
|
|
// @phan-suppress-next-line PhanImpossibleConditionInLoop
|
|
} while ( count( $this->trxPreCommitOrIdleCallbacks ) );
|
|
|
|
if ( $e instanceof Throwable ) {
|
|
throw $e; // re-throw any first exception
|
|
}
|
|
|
|
return $count;
|
|
}
|
|
|
|
/**
|
|
* Actually run any "atomic section cancel" callbacks.
|
|
*
|
|
* @param int $trigger IDatabase::TRIGGER_* constant
|
|
* @param AtomicSectionIdentifier[]|null $sectionIds Section IDs to cancel,
|
|
* null on transaction rollback
|
|
*/
|
|
private function runOnAtomicSectionCancelCallbacks(
|
|
$trigger, array $sectionIds = null
|
|
) {
|
|
/** @var Throwable $e */
|
|
$e = null; // first exception
|
|
|
|
$notCancelled = [];
|
|
do {
|
|
$callbacks = $this->trxSectionCancelCallbacks;
|
|
$this->trxSectionCancelCallbacks = []; // consumed (recursion guard)
|
|
foreach ( $callbacks as $entry ) {
|
|
if ( $sectionIds === null || in_array( $entry[2], $sectionIds, true ) ) {
|
|
try {
|
|
// @phan-suppress-next-line PhanUndeclaredInvokeInCallable
|
|
$entry[0]( $trigger, $this );
|
|
} catch ( Throwable $ex ) {
|
|
( $this->errorLogger )( $ex );
|
|
$e = $e ?: $ex;
|
|
}
|
|
} else {
|
|
$notCancelled[] = $entry;
|
|
}
|
|
}
|
|
// @phan-suppress-next-line PhanImpossibleConditionInLoop
|
|
} while ( count( $this->trxSectionCancelCallbacks ) );
|
|
$this->trxSectionCancelCallbacks = $notCancelled;
|
|
|
|
if ( $e !== null ) {
|
|
throw $e; // re-throw any first Throwable
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Actually run any "transaction listener" callbacks.
|
|
*
|
|
* This method should not be used outside of Database/LoadBalancer
|
|
*
|
|
* @param int $trigger IDatabase::TRIGGER_* constant
|
|
* @throws Exception
|
|
* @since 1.20
|
|
*/
|
|
public function runTransactionListenerCallbacks( $trigger ) {
|
|
if ( $this->trxEndCallbacksSuppressed ) {
|
|
return;
|
|
}
|
|
|
|
/** @var Throwable $e */
|
|
$e = null; // first exception
|
|
|
|
foreach ( $this->trxRecurringCallbacks as $phpCallback ) {
|
|
try {
|
|
$phpCallback( $trigger, $this );
|
|
} catch ( Throwable $ex ) {
|
|
( $this->errorLogger )( $ex );
|
|
$e = $e ?: $ex;
|
|
}
|
|
}
|
|
|
|
if ( $e instanceof Throwable ) {
|
|
throw $e; // re-throw any first exception
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Create a savepoint
|
|
*
|
|
* This is used internally to implement atomic sections. It should not be
|
|
* used otherwise.
|
|
*
|
|
* @stable to override
|
|
* @since 1.31
|
|
* @param string $identifier Identifier for the savepoint
|
|
* @param string $fname Calling function name
|
|
*/
|
|
protected function doSavepoint( $identifier, $fname ) {
|
|
$sql = 'SAVEPOINT ' . $this->addIdentifierQuotes( $identifier );
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_TRX );
|
|
}
|
|
|
|
/**
|
|
* Release a savepoint
|
|
*
|
|
* This is used internally to implement atomic sections. It should not be
|
|
* used otherwise.
|
|
*
|
|
* @stable to override
|
|
* @since 1.31
|
|
* @param string $identifier Identifier for the savepoint
|
|
* @param string $fname Calling function name
|
|
*/
|
|
protected function doReleaseSavepoint( $identifier, $fname ) {
|
|
$sql = 'RELEASE SAVEPOINT ' . $this->addIdentifierQuotes( $identifier );
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_TRX );
|
|
}
|
|
|
|
/**
|
|
* Rollback to a savepoint
|
|
*
|
|
* This is used internally to implement atomic sections. It should not be
|
|
* used otherwise.
|
|
*
|
|
* @stable to override
|
|
* @since 1.31
|
|
* @param string $identifier Identifier for the savepoint
|
|
* @param string $fname Calling function name
|
|
*/
|
|
protected function doRollbackToSavepoint( $identifier, $fname ) {
|
|
$sql = 'ROLLBACK TO SAVEPOINT ' . $this->addIdentifierQuotes( $identifier );
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_TRX );
|
|
}
|
|
|
|
/**
|
|
* @param string $fname
|
|
* @return string
|
|
*/
|
|
private function nextSavepointId( $fname ) {
|
|
$savepointId = self::$SAVEPOINT_PREFIX . ++$this->trxAtomicCounter;
|
|
if ( strlen( $savepointId ) > 30 ) {
|
|
// 30 == Oracle's identifier length limit (pre 12c)
|
|
// With a 22 character prefix, that puts the highest number at 99999999.
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
'There have been an excessively large number of atomic sections in a transaction'
|
|
. " started by $this->trxFname (at $fname)"
|
|
);
|
|
}
|
|
|
|
return $savepointId;
|
|
}
|
|
|
|
final public function startAtomic(
|
|
$fname = __METHOD__,
|
|
$cancelable = self::ATOMIC_NOT_CANCELABLE
|
|
) {
|
|
$savepointId = $cancelable === self::ATOMIC_CANCELABLE ? self::$NOT_APPLICABLE : null;
|
|
|
|
if ( !$this->trxLevel() ) {
|
|
$this->begin( $fname, self::TRANSACTION_INTERNAL ); // sets trxAutomatic
|
|
// If DBO_TRX is set, a series of startAtomic/endAtomic pairs will result
|
|
// in all changes being in one transaction to keep requests transactional.
|
|
if ( $this->getFlag( self::DBO_TRX ) ) {
|
|
// Since writes could happen in between the topmost atomic sections as part
|
|
// of the transaction, those sections will need savepoints.
|
|
$savepointId = $this->nextSavepointId( $fname );
|
|
$this->doSavepoint( $savepointId, $fname );
|
|
} else {
|
|
$this->trxAutomaticAtomic = true;
|
|
}
|
|
} elseif ( $cancelable === self::ATOMIC_CANCELABLE ) {
|
|
$savepointId = $this->nextSavepointId( $fname );
|
|
$this->doSavepoint( $savepointId, $fname );
|
|
}
|
|
|
|
$sectionId = new AtomicSectionIdentifier;
|
|
$this->trxAtomicLevels[] = [ $fname, $sectionId, $savepointId ];
|
|
$this->queryLogger->debug( 'startAtomic: entering level ' .
|
|
( count( $this->trxAtomicLevels ) - 1 ) . " ($fname)" );
|
|
|
|
return $sectionId;
|
|
}
|
|
|
|
final public function endAtomic( $fname = __METHOD__ ) {
|
|
if ( !$this->trxLevel() || !$this->trxAtomicLevels ) {
|
|
throw new DBUnexpectedError( $this, "No atomic section is open (got $fname)" );
|
|
}
|
|
|
|
// Check if the current section matches $fname
|
|
$pos = count( $this->trxAtomicLevels ) - 1;
|
|
list( $savedFname, $sectionId, $savepointId ) = $this->trxAtomicLevels[$pos];
|
|
$this->queryLogger->debug( "endAtomic: leaving level $pos ($fname)" );
|
|
|
|
if ( $savedFname !== $fname ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"Invalid atomic section ended (got $fname but expected $savedFname)"
|
|
);
|
|
}
|
|
|
|
// Remove the last section (no need to re-index the array)
|
|
array_pop( $this->trxAtomicLevels );
|
|
|
|
if ( !$this->trxAtomicLevels && $this->trxAutomaticAtomic ) {
|
|
$this->commit( $fname, self::FLUSHING_INTERNAL );
|
|
} elseif ( $savepointId !== null && $savepointId !== self::$NOT_APPLICABLE ) {
|
|
$this->doReleaseSavepoint( $savepointId, $fname );
|
|
}
|
|
|
|
// Hoist callback ownership for callbacks in the section that just ended;
|
|
// all callbacks should have an owner that is present in trxAtomicLevels.
|
|
$currentSectionId = $this->currentAtomicSectionId();
|
|
if ( $currentSectionId ) {
|
|
$this->reassignCallbacksForSection( $sectionId, $currentSectionId );
|
|
}
|
|
}
|
|
|
|
final public function cancelAtomic(
|
|
$fname = __METHOD__,
|
|
AtomicSectionIdentifier $sectionId = null
|
|
) {
|
|
if ( !$this->trxLevel() || !$this->trxAtomicLevels ) {
|
|
throw new DBUnexpectedError( $this, "No atomic section is open (got $fname)" );
|
|
}
|
|
|
|
$excisedIds = [];
|
|
$newTopSection = $this->currentAtomicSectionId();
|
|
try {
|
|
$excisedFnames = [];
|
|
if ( $sectionId !== null ) {
|
|
// Find the (last) section with the given $sectionId
|
|
$pos = -1;
|
|
foreach ( $this->trxAtomicLevels as $i => list( $asFname, $asId, $spId ) ) {
|
|
if ( $asId === $sectionId ) {
|
|
$pos = $i;
|
|
}
|
|
}
|
|
if ( $pos < 0 ) {
|
|
throw new DBUnexpectedError( $this, "Atomic section not found (for $fname)" );
|
|
}
|
|
// Remove all descendant sections and re-index the array
|
|
$len = count( $this->trxAtomicLevels );
|
|
for ( $i = $pos + 1; $i < $len; ++$i ) {
|
|
$excisedFnames[] = $this->trxAtomicLevels[$i][0];
|
|
$excisedIds[] = $this->trxAtomicLevels[$i][1];
|
|
}
|
|
$this->trxAtomicLevels = array_slice( $this->trxAtomicLevels, 0, $pos + 1 );
|
|
$newTopSection = $this->currentAtomicSectionId();
|
|
}
|
|
|
|
// Check if the current section matches $fname
|
|
$pos = count( $this->trxAtomicLevels ) - 1;
|
|
list( $savedFname, $savedSectionId, $savepointId ) = $this->trxAtomicLevels[$pos];
|
|
|
|
if ( $excisedFnames ) {
|
|
$this->queryLogger->debug( "cancelAtomic: canceling level $pos ($savedFname) " .
|
|
"and descendants " . implode( ', ', $excisedFnames ) );
|
|
} else {
|
|
$this->queryLogger->debug( "cancelAtomic: canceling level $pos ($savedFname)" );
|
|
}
|
|
|
|
if ( $savedFname !== $fname ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"Invalid atomic section ended (got $fname but expected $savedFname)"
|
|
);
|
|
}
|
|
|
|
// Remove the last section (no need to re-index the array)
|
|
array_pop( $this->trxAtomicLevels );
|
|
$excisedIds[] = $savedSectionId;
|
|
$newTopSection = $this->currentAtomicSectionId();
|
|
|
|
if ( $savepointId !== null ) {
|
|
// Rollback the transaction to the state just before this atomic section
|
|
if ( $savepointId === self::$NOT_APPLICABLE ) {
|
|
$this->rollback( $fname, self::FLUSHING_INTERNAL );
|
|
// Note: rollback() will run trxSectionCancelCallbacks
|
|
} else {
|
|
$this->doRollbackToSavepoint( $savepointId, $fname );
|
|
$this->trxStatus = self::STATUS_TRX_OK; // no exception; recovered
|
|
$this->trxStatusIgnoredCause = null;
|
|
|
|
// Run trxSectionCancelCallbacks now.
|
|
$this->runOnAtomicSectionCancelCallbacks( self::TRIGGER_CANCEL, $excisedIds );
|
|
}
|
|
} elseif ( $this->trxStatus > self::STATUS_TRX_ERROR ) {
|
|
// Put the transaction into an error state if it's not already in one
|
|
$this->trxStatus = self::STATUS_TRX_ERROR;
|
|
$this->trxStatusCause = new DBUnexpectedError(
|
|
$this,
|
|
"Uncancelable atomic section canceled (got $fname)"
|
|
);
|
|
}
|
|
} finally {
|
|
// Fix up callbacks owned by the sections that were just cancelled.
|
|
// All callbacks should have an owner that is present in trxAtomicLevels.
|
|
$this->modifyCallbacksForCancel( $excisedIds, $newTopSection );
|
|
}
|
|
|
|
$this->affectedRowCount = 0; // for the sake of consistency
|
|
}
|
|
|
|
final public function doAtomicSection(
|
|
$fname,
|
|
callable $callback,
|
|
$cancelable = self::ATOMIC_NOT_CANCELABLE
|
|
) {
|
|
$sectionId = $this->startAtomic( $fname, $cancelable );
|
|
try {
|
|
$res = $callback( $this, $fname );
|
|
} catch ( Throwable $e ) {
|
|
$this->cancelAtomic( $fname, $sectionId );
|
|
|
|
throw $e;
|
|
}
|
|
$this->endAtomic( $fname );
|
|
|
|
return $res;
|
|
}
|
|
|
|
final public function begin( $fname = __METHOD__, $mode = self::TRANSACTION_EXPLICIT ) {
|
|
static $modes = [ self::TRANSACTION_EXPLICIT, self::TRANSACTION_INTERNAL ];
|
|
if ( !in_array( $mode, $modes, true ) ) {
|
|
throw new DBUnexpectedError( $this, "$fname: invalid mode parameter '$mode'" );
|
|
}
|
|
|
|
// Protect against mismatched atomic section, transaction nesting, and snapshot loss
|
|
if ( $this->trxLevel() ) {
|
|
if ( $this->trxAtomicLevels ) {
|
|
$levels = $this->flatAtomicSectionList();
|
|
$msg = "$fname: got explicit BEGIN while atomic section(s) $levels are open";
|
|
throw new DBUnexpectedError( $this, $msg );
|
|
} elseif ( !$this->trxAutomatic ) {
|
|
$msg = "$fname: explicit transaction already active (from {$this->trxFname})";
|
|
throw new DBUnexpectedError( $this, $msg );
|
|
} else {
|
|
$msg = "$fname: implicit transaction already active (from {$this->trxFname})";
|
|
throw new DBUnexpectedError( $this, $msg );
|
|
}
|
|
} elseif ( $this->getFlag( self::DBO_TRX ) && $mode !== self::TRANSACTION_INTERNAL ) {
|
|
$msg = "$fname: implicit transaction expected (DBO_TRX set)";
|
|
throw new DBUnexpectedError( $this, $msg );
|
|
}
|
|
|
|
$this->assertHasConnectionHandle();
|
|
|
|
$this->doBegin( $fname );
|
|
$this->trxShortId = sprintf( '%06x', mt_rand( 0, 0xffffff ) );
|
|
$this->trxStatus = self::STATUS_TRX_OK;
|
|
$this->trxStatusIgnoredCause = null;
|
|
$this->trxAtomicCounter = 0;
|
|
$this->trxTimestamp = microtime( true );
|
|
$this->trxFname = $fname;
|
|
$this->trxDoneWrites = false;
|
|
$this->trxAutomaticAtomic = false;
|
|
$this->trxAtomicLevels = [];
|
|
$this->trxWriteDuration = 0.0;
|
|
$this->trxWriteQueryCount = 0;
|
|
$this->trxWriteAffectedRows = 0;
|
|
$this->trxWriteAdjDuration = 0.0;
|
|
$this->trxWriteAdjQueryCount = 0;
|
|
$this->trxWriteCallers = [];
|
|
// First SELECT after BEGIN will establish the snapshot in REPEATABLE-READ.
|
|
// Get an estimate of the replication lag before any such queries.
|
|
$this->trxReplicaLag = null; // clear cached value first
|
|
$this->trxReplicaLag = $this->getApproximateLagStatus()['lag'];
|
|
// T147697: make explicitTrxActive() return true until begin() finishes. This way, no
|
|
// caller will think its OK to muck around with the transaction just because startAtomic()
|
|
// has not yet completed (e.g. setting trxAtomicLevels).
|
|
$this->trxAutomatic = ( $mode === self::TRANSACTION_INTERNAL );
|
|
}
|
|
|
|
/**
|
|
* Issues the BEGIN command to the database server.
|
|
*
|
|
* @see Database::begin()
|
|
* @stable to override
|
|
* @param string $fname
|
|
* @throws DBError
|
|
*/
|
|
protected function doBegin( $fname ) {
|
|
$this->query( 'BEGIN', $fname, self::QUERY_CHANGE_TRX );
|
|
}
|
|
|
|
final public function commit( $fname = __METHOD__, $flush = self::FLUSHING_ONE ) {
|
|
static $modes = [ self::FLUSHING_ONE, self::FLUSHING_ALL_PEERS, self::FLUSHING_INTERNAL ];
|
|
if ( !in_array( $flush, $modes, true ) ) {
|
|
throw new DBUnexpectedError( $this, "$fname: invalid flush parameter '$flush'" );
|
|
}
|
|
|
|
if ( $this->trxLevel() && $this->trxAtomicLevels ) {
|
|
// There are still atomic sections open; this cannot be ignored
|
|
$levels = $this->flatAtomicSectionList();
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"$fname: got COMMIT while atomic sections $levels are still open"
|
|
);
|
|
}
|
|
|
|
if ( $flush === self::FLUSHING_INTERNAL || $flush === self::FLUSHING_ALL_PEERS ) {
|
|
if ( !$this->trxLevel() ) {
|
|
return; // nothing to do
|
|
} elseif ( !$this->trxAutomatic ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"$fname: flushing an explicit transaction, getting out of sync"
|
|
);
|
|
}
|
|
} elseif ( !$this->trxLevel() ) {
|
|
$this->queryLogger->error(
|
|
"$fname: no transaction to commit, something got out of sync",
|
|
[ 'exception' => new RuntimeException() ]
|
|
);
|
|
|
|
return; // nothing to do
|
|
} elseif ( $this->trxAutomatic ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"$fname: expected mass commit of all peer transactions (DBO_TRX set)"
|
|
);
|
|
}
|
|
|
|
$this->assertHasConnectionHandle();
|
|
|
|
$this->runOnTransactionPreCommitCallbacks();
|
|
|
|
$writeTime = $this->pendingWriteQueryDuration( self::ESTIMATE_DB_APPLY );
|
|
$this->doCommit( $fname );
|
|
$oldTrxShortId = $this->consumeTrxShortId();
|
|
$this->trxStatus = self::STATUS_TRX_NONE;
|
|
|
|
if ( $this->trxDoneWrites ) {
|
|
$this->lastWriteTime = microtime( true );
|
|
$this->trxProfiler->transactionWritingOut(
|
|
$this->server,
|
|
$this->getDomainID(),
|
|
$oldTrxShortId,
|
|
$writeTime,
|
|
$this->trxWriteAffectedRows
|
|
);
|
|
}
|
|
|
|
// With FLUSHING_ALL_PEERS, callbacks will be explicitly run later
|
|
if ( $flush !== self::FLUSHING_ALL_PEERS ) {
|
|
$this->runOnTransactionIdleCallbacks( self::TRIGGER_COMMIT );
|
|
$this->runTransactionListenerCallbacks( self::TRIGGER_COMMIT );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Issues the COMMIT command to the database server.
|
|
*
|
|
* @stable to override
|
|
* @see Database::commit()
|
|
* @param string $fname
|
|
* @throws DBError
|
|
*/
|
|
protected function doCommit( $fname ) {
|
|
if ( $this->trxLevel() ) {
|
|
$this->query( 'COMMIT', $fname, self::QUERY_CHANGE_TRX );
|
|
}
|
|
}
|
|
|
|
final public function rollback( $fname = __METHOD__, $flush = self::FLUSHING_ONE ) {
|
|
$trxActive = $this->trxLevel();
|
|
|
|
if ( $flush !== self::FLUSHING_INTERNAL
|
|
&& $flush !== self::FLUSHING_ALL_PEERS
|
|
&& $this->getFlag( self::DBO_TRX )
|
|
) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"$fname: Expected mass rollback of all peer transactions (DBO_TRX set)"
|
|
);
|
|
}
|
|
|
|
if ( $trxActive ) {
|
|
$this->assertHasConnectionHandle();
|
|
|
|
$this->doRollback( $fname );
|
|
$oldTrxShortId = $this->consumeTrxShortId();
|
|
$this->trxStatus = self::STATUS_TRX_NONE;
|
|
$this->trxAtomicLevels = [];
|
|
// Estimate the RTT via a query now that trxStatus is OK
|
|
$writeTime = $this->pingAndCalculateLastTrxApplyTime();
|
|
|
|
if ( $this->trxDoneWrites ) {
|
|
$this->trxProfiler->transactionWritingOut(
|
|
$this->server,
|
|
$this->getDomainID(),
|
|
$oldTrxShortId,
|
|
$writeTime,
|
|
$this->trxWriteAffectedRows
|
|
);
|
|
}
|
|
}
|
|
|
|
// Clear any commit-dependent callbacks. They might even be present
|
|
// only due to transaction rounds, with no SQL transaction being active
|
|
$this->trxPostCommitOrIdleCallbacks = [];
|
|
$this->trxPreCommitOrIdleCallbacks = [];
|
|
|
|
// With FLUSHING_ALL_PEERS, callbacks will be explicitly run later
|
|
if ( $trxActive && $flush !== self::FLUSHING_ALL_PEERS ) {
|
|
try {
|
|
$this->runOnTransactionIdleCallbacks( self::TRIGGER_ROLLBACK );
|
|
} catch ( Throwable $e ) {
|
|
// already logged; finish and let LoadBalancer move on during mass-rollback
|
|
}
|
|
try {
|
|
$this->runTransactionListenerCallbacks( self::TRIGGER_ROLLBACK );
|
|
} catch ( Throwable $e ) {
|
|
// already logged; let LoadBalancer move on during mass-rollback
|
|
}
|
|
|
|
$this->affectedRowCount = 0; // for the sake of consistency
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Issues the ROLLBACK command to the database server.
|
|
*
|
|
* @stable to override
|
|
* @see Database::rollback()
|
|
* @param string $fname
|
|
* @throws DBError
|
|
*/
|
|
protected function doRollback( $fname ) {
|
|
if ( $this->trxLevel() ) {
|
|
# Disconnects cause rollback anyway, so ignore those errors
|
|
$this->query( 'ROLLBACK', $fname, self::QUERY_SILENCE_ERRORS | self::QUERY_CHANGE_TRX );
|
|
}
|
|
}
|
|
|
|
public function flushSnapshot( $fname = __METHOD__, $flush = self::FLUSHING_ONE ) {
|
|
if ( $this->explicitTrxActive() ) {
|
|
// Committing this transaction would break callers that assume it is still open
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"$fname: Cannot flush snapshot; " .
|
|
"explicit transaction '{$this->trxFname}' is still open"
|
|
);
|
|
} elseif ( $this->writesOrCallbacksPending() ) {
|
|
// This only flushes transactions to clear snapshots, not to write data
|
|
$fnames = implode( ', ', $this->pendingWriteAndCallbackCallers() );
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"$fname: Cannot flush snapshot; " .
|
|
"writes from transaction {$this->trxFname} are still pending ($fnames)"
|
|
);
|
|
} elseif (
|
|
$this->trxLevel() &&
|
|
$this->getTransactionRoundId() &&
|
|
$flush !== self::FLUSHING_INTERNAL &&
|
|
$flush !== self::FLUSHING_ALL_PEERS
|
|
) {
|
|
$this->queryLogger->warning(
|
|
"$fname: Expected mass snapshot flush of all peer transactions " .
|
|
"in the explicit transactions round '{$this->getTransactionRoundId()}'",
|
|
[ 'exception' => new RuntimeException() ]
|
|
);
|
|
}
|
|
|
|
$this->commit( $fname, self::FLUSHING_INTERNAL );
|
|
}
|
|
|
|
public function explicitTrxActive() {
|
|
return $this->trxLevel() && ( $this->trxAtomicLevels || !$this->trxAutomatic );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function duplicateTableStructure(
|
|
$oldName,
|
|
$newName,
|
|
$temporary = false,
|
|
$fname = __METHOD__
|
|
) {
|
|
throw new RuntimeException( __METHOD__ . ' is not implemented in descendant class' );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function listTables( $prefix = null, $fname = __METHOD__ ) {
|
|
throw new RuntimeException( __METHOD__ . ' is not implemented in descendant class' );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function listViews( $prefix = null, $fname = __METHOD__ ) {
|
|
throw new RuntimeException( __METHOD__ . ' is not implemented in descendant class' );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function timestamp( $ts = 0 ) {
|
|
$t = new ConvertibleTimestamp( $ts );
|
|
// Let errors bubble up to avoid putting garbage in the DB
|
|
return $t->getTimestamp( TS_MW );
|
|
}
|
|
|
|
public function timestampOrNull( $ts = null ) {
|
|
if ( $ts === null ) {
|
|
return null;
|
|
} else {
|
|
return $this->timestamp( $ts );
|
|
}
|
|
}
|
|
|
|
public function affectedRows() {
|
|
return ( $this->affectedRowCount === null )
|
|
? $this->fetchAffectedRowCount() // default to driver value
|
|
: $this->affectedRowCount;
|
|
}
|
|
|
|
/**
|
|
* @return int Number of retrieved rows according to the driver
|
|
*/
|
|
abstract protected function fetchAffectedRowCount();
|
|
|
|
/**
|
|
* Take a query result and wrap it in an iterable result wrapper if necessary.
|
|
* Booleans are passed through as-is to indicate success/failure of write queries.
|
|
*
|
|
* Once upon a time, Database::query() returned a bare MySQL result
|
|
* resource, and it was necessary to call this function to convert it to
|
|
* a wrapper. Nowadays, raw database objects are never exposed to external
|
|
* callers, so this is unnecessary in external code.
|
|
*
|
|
* @param bool|IResultWrapper|resource $result
|
|
* @return bool|IResultWrapper
|
|
*/
|
|
protected function resultObject( $result ) {
|
|
if ( !$result ) {
|
|
return false; // failed query
|
|
} elseif ( $result instanceof IResultWrapper ) {
|
|
return $result;
|
|
} elseif ( $result === true ) {
|
|
return $result; // successful write query
|
|
} else {
|
|
return new ResultWrapper( $this, $result );
|
|
}
|
|
}
|
|
|
|
public function ping( &$rtt = null ) {
|
|
// Avoid hitting the server if it was hit recently
|
|
if ( $this->isOpen() && ( microtime( true ) - $this->lastPing ) < self::$PING_TTL ) {
|
|
if ( !func_num_args() || $this->lastRoundTripEstimate > 0 ) {
|
|
$rtt = $this->lastRoundTripEstimate;
|
|
return true; // don't care about $rtt
|
|
}
|
|
}
|
|
|
|
// This will reconnect if possible or return false if not
|
|
$flags = self::QUERY_IGNORE_DBO_TRX | self::QUERY_SILENCE_ERRORS | self::QUERY_CHANGE_NONE;
|
|
$ok = ( $this->query( self::$PING_QUERY, __METHOD__, $flags ) !== false );
|
|
if ( $ok ) {
|
|
$rtt = $this->lastRoundTripEstimate;
|
|
}
|
|
|
|
return $ok;
|
|
}
|
|
|
|
/**
|
|
* Close any existing (dead) database connection and open a new connection
|
|
*
|
|
* @param string $fname
|
|
* @return bool True if new connection is opened successfully, false if error
|
|
*/
|
|
protected function replaceLostConnection( $fname ) {
|
|
$this->closeConnection();
|
|
$this->conn = null;
|
|
|
|
$this->handleSessionLossPreconnect();
|
|
|
|
try {
|
|
$this->open(
|
|
$this->server,
|
|
$this->user,
|
|
$this->password,
|
|
$this->currentDomain->getDatabase(),
|
|
$this->currentDomain->getSchema(),
|
|
$this->tablePrefix()
|
|
);
|
|
$this->lastPing = microtime( true );
|
|
$ok = true;
|
|
|
|
$this->connLogger->warning(
|
|
$fname . ': lost connection to {dbserver}; reconnected',
|
|
[
|
|
'dbserver' => $this->getServer(),
|
|
'exception' => new RuntimeException()
|
|
]
|
|
);
|
|
} catch ( DBConnectionError $e ) {
|
|
$ok = false;
|
|
|
|
$this->connLogger->error(
|
|
$fname . ': lost connection to {dbserver} permanently',
|
|
[ 'dbserver' => $this->getServer() ]
|
|
);
|
|
}
|
|
|
|
$this->handleSessionLossPostconnect();
|
|
|
|
return $ok;
|
|
}
|
|
|
|
public function getSessionLagStatus() {
|
|
return $this->getRecordedTransactionLagStatus() ?: $this->getApproximateLagStatus();
|
|
}
|
|
|
|
/**
|
|
* Get the replica DB lag when the current transaction started
|
|
*
|
|
* This is useful when transactions might use snapshot isolation
|
|
* (e.g. REPEATABLE-READ in innodb), so the "real" lag of that data
|
|
* is this lag plus transaction duration. If they don't, it is still
|
|
* safe to be pessimistic. This returns null if there is no transaction.
|
|
*
|
|
* This returns null if the lag status for this transaction was not yet recorded.
|
|
*
|
|
* @return array|null ('lag': seconds or false on error, 'since': UNIX timestamp of BEGIN)
|
|
* @since 1.27
|
|
*/
|
|
final protected function getRecordedTransactionLagStatus() {
|
|
return ( $this->trxLevel() && $this->trxReplicaLag !== null )
|
|
? [ 'lag' => $this->trxReplicaLag, 'since' => $this->trxTimestamp() ]
|
|
: null;
|
|
}
|
|
|
|
/**
|
|
* Get a replica DB lag estimate for this server at the start of a transaction
|
|
*
|
|
* This is a no-op unless the server is known a priori to be a replica DB
|
|
*
|
|
* @stable to override
|
|
* @return array ('lag': seconds or false on error, 'since': UNIX timestamp of estimate)
|
|
* @since 1.27
|
|
*/
|
|
protected function getApproximateLagStatus() {
|
|
return [
|
|
'lag' => ( $this->topologyRole === self::ROLE_STREAMING_REPLICA ) ? $this->getLag() : 0,
|
|
'since' => microtime( true )
|
|
];
|
|
}
|
|
|
|
/**
|
|
* Merge the result of getSessionLagStatus() for several DBs
|
|
* using the most pessimistic values to estimate the lag of
|
|
* any data derived from them in combination
|
|
*
|
|
* This is information is useful for caching modules
|
|
*
|
|
* @see WANObjectCache::set()
|
|
* @see WANObjectCache::getWithSetCallback()
|
|
*
|
|
* @param IDatabase|null ...$dbs
|
|
* Note: For backward compatibility, it is allowed for null values
|
|
* to be passed among the parameters. This is deprecated since 1.36,
|
|
* only IDatabase objects should be passed.
|
|
*
|
|
* @return array Map of values:
|
|
* - lag: highest lag of any of the DBs or false on error (e.g. replication stopped)
|
|
* - since: oldest UNIX timestamp of any of the DB lag estimates
|
|
* - pending: whether any of the DBs have uncommitted changes
|
|
* @throws DBError
|
|
* @since 1.27
|
|
*/
|
|
public static function getCacheSetOptions( ?IDatabase ...$dbs ) {
|
|
$res = [ 'lag' => 0, 'since' => INF, 'pending' => false ];
|
|
|
|
foreach ( func_get_args() as $db ) {
|
|
if ( $db instanceof IDatabase ) {
|
|
$status = $db->getSessionLagStatus();
|
|
|
|
if ( $status['lag'] === false ) {
|
|
$res['lag'] = false;
|
|
} elseif ( $res['lag'] !== false ) {
|
|
$res['lag'] = max( $res['lag'], $status['lag'] );
|
|
}
|
|
$res['since'] = min( $res['since'], $status['since'] );
|
|
$res['pending'] = $res['pending'] ?: $db->writesPending();
|
|
}
|
|
}
|
|
|
|
return $res;
|
|
}
|
|
|
|
public function getLag() {
|
|
if ( $this->topologyRole === self::ROLE_STREAMING_MASTER ) {
|
|
return 0; // this is the master
|
|
} elseif ( $this->topologyRole === self::ROLE_STATIC_CLONE ) {
|
|
return 0; // static dataset
|
|
}
|
|
|
|
return $this->doGetLag();
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
protected function doGetLag() {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function maxListLen() {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function encodeBlob( $b ) {
|
|
return $b;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function decodeBlob( $b ) {
|
|
if ( $b instanceof Blob ) {
|
|
$b = $b->fetch();
|
|
}
|
|
return $b;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function setSessionOptions( array $options ) {
|
|
}
|
|
|
|
public function sourceFile(
|
|
$filename,
|
|
callable $lineCallback = null,
|
|
callable $resultCallback = null,
|
|
$fname = false,
|
|
callable $inputCallback = null
|
|
) {
|
|
AtEase::suppressWarnings();
|
|
$fp = fopen( $filename, 'r' );
|
|
AtEase::restoreWarnings();
|
|
|
|
if ( $fp === false ) {
|
|
throw new RuntimeException( "Could not open \"{$filename}\"" );
|
|
}
|
|
|
|
if ( !$fname ) {
|
|
$fname = __METHOD__ . "( $filename )";
|
|
}
|
|
|
|
try {
|
|
$error = $this->sourceStream(
|
|
$fp, $lineCallback, $resultCallback, $fname, $inputCallback );
|
|
} catch ( Throwable $e ) {
|
|
fclose( $fp );
|
|
throw $e;
|
|
}
|
|
|
|
fclose( $fp );
|
|
|
|
return $error;
|
|
}
|
|
|
|
public function setSchemaVars( $vars ) {
|
|
$this->schemaVars = is_array( $vars ) ? $vars : null;
|
|
}
|
|
|
|
public function sourceStream(
|
|
$fp,
|
|
callable $lineCallback = null,
|
|
callable $resultCallback = null,
|
|
$fname = __METHOD__,
|
|
callable $inputCallback = null
|
|
) {
|
|
$delimiterReset = new ScopedCallback(
|
|
function ( $delimiter ) {
|
|
$this->delimiter = $delimiter;
|
|
},
|
|
[ $this->delimiter ]
|
|
);
|
|
$cmd = '';
|
|
|
|
while ( !feof( $fp ) ) {
|
|
if ( $lineCallback ) {
|
|
call_user_func( $lineCallback );
|
|
}
|
|
|
|
$line = trim( fgets( $fp ) );
|
|
|
|
if ( $line == '' ) {
|
|
continue;
|
|
}
|
|
|
|
if ( $line[0] == '-' && $line[1] == '-' ) {
|
|
continue;
|
|
}
|
|
|
|
if ( $cmd != '' ) {
|
|
$cmd .= ' ';
|
|
}
|
|
|
|
$done = $this->streamStatementEnd( $cmd, $line );
|
|
|
|
$cmd .= "$line\n";
|
|
|
|
if ( $done || feof( $fp ) ) {
|
|
$cmd = $this->replaceVars( $cmd );
|
|
|
|
if ( $inputCallback ) {
|
|
$callbackResult = $inputCallback( $cmd );
|
|
|
|
if ( is_string( $callbackResult ) || !$callbackResult ) {
|
|
$cmd = $callbackResult;
|
|
}
|
|
}
|
|
|
|
if ( $cmd ) {
|
|
$res = $this->query( $cmd, $fname );
|
|
|
|
if ( $resultCallback ) {
|
|
$resultCallback( $res, $this );
|
|
}
|
|
|
|
if ( $res === false ) {
|
|
$err = $this->lastError();
|
|
|
|
return "Query \"{$cmd}\" failed with error code \"$err\".\n";
|
|
}
|
|
}
|
|
$cmd = '';
|
|
}
|
|
}
|
|
|
|
ScopedCallback::consume( $delimiterReset );
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Called by sourceStream() to check if we've reached a statement end
|
|
*
|
|
* @stable to override
|
|
* @param string &$sql SQL assembled so far
|
|
* @param string &$newLine New line about to be added to $sql
|
|
* @return bool Whether $newLine contains end of the statement
|
|
*/
|
|
public function streamStatementEnd( &$sql, &$newLine ) {
|
|
if ( $this->delimiter ) {
|
|
$prev = $newLine;
|
|
$newLine = preg_replace(
|
|
'/' . preg_quote( $this->delimiter, '/' ) . '$/',
|
|
'',
|
|
$newLine
|
|
);
|
|
if ( $newLine != $prev ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Database-independent variable replacement. Replaces a set of variables
|
|
* in an SQL statement with their contents as given by $this->getSchemaVars().
|
|
*
|
|
* Supports '{$var}' `{$var}` and / *$var* / (without the spaces) style variables.
|
|
*
|
|
* - '{$var}' should be used for text and is passed through the database's
|
|
* addQuotes method.
|
|
* - `{$var}` should be used for identifiers (e.g. table and database names).
|
|
* It is passed through the database's addIdentifierQuotes method which
|
|
* can be overridden if the database uses something other than backticks.
|
|
* - / *_* / or / *$wgDBprefix* / passes the name that follows through the
|
|
* database's tableName method.
|
|
* - / *i* / passes the name that follows through the database's indexName method.
|
|
* - In all other cases, / *$var* / is left unencoded. Except for table options,
|
|
* its use should be avoided. In 1.24 and older, string encoding was applied.
|
|
*
|
|
* @stable to override
|
|
* @param string $ins SQL statement to replace variables in
|
|
* @return string The new SQL statement with variables replaced
|
|
*/
|
|
protected function replaceVars( $ins ) {
|
|
$vars = $this->getSchemaVars();
|
|
return preg_replace_callback(
|
|
'!
|
|
/\* (\$wgDBprefix|[_i]) \*/ (\w*) | # 1-2. tableName, indexName
|
|
\'\{\$ (\w+) }\' | # 3. addQuotes
|
|
`\{\$ (\w+) }` | # 4. addIdentifierQuotes
|
|
/\*\$ (\w+) \*/ # 5. leave unencoded
|
|
!x',
|
|
function ( $m ) use ( $vars ) {
|
|
// Note: Because of <https://bugs.php.net/bug.php?id=51881>,
|
|
// check for both nonexistent keys *and* the empty string.
|
|
if ( isset( $m[1] ) && $m[1] !== '' ) {
|
|
if ( $m[1] === 'i' ) {
|
|
return $this->indexName( $m[2] );
|
|
} else {
|
|
return $this->tableName( $m[2] );
|
|
}
|
|
} elseif ( isset( $m[3] ) && $m[3] !== '' && array_key_exists( $m[3], $vars ) ) {
|
|
return $this->addQuotes( $vars[$m[3]] );
|
|
} elseif ( isset( $m[4] ) && $m[4] !== '' && array_key_exists( $m[4], $vars ) ) {
|
|
return $this->addIdentifierQuotes( $vars[$m[4]] );
|
|
} elseif ( isset( $m[5] ) && $m[5] !== '' && array_key_exists( $m[5], $vars ) ) {
|
|
return $vars[$m[5]];
|
|
} else {
|
|
return $m[0];
|
|
}
|
|
},
|
|
$ins
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Get schema variables. If none have been set via setSchemaVars(), then
|
|
* use some defaults from the current object.
|
|
*
|
|
* @return array
|
|
*/
|
|
protected function getSchemaVars() {
|
|
return $this->schemaVars ?? $this->getDefaultSchemaVars();
|
|
}
|
|
|
|
/**
|
|
* Get schema variables to use if none have been set via setSchemaVars().
|
|
*
|
|
* Override this in derived classes to provide variables for tables.sql
|
|
* and SQL patch files.
|
|
*
|
|
* @stable to override
|
|
* @return array
|
|
*/
|
|
protected function getDefaultSchemaVars() {
|
|
return [];
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function lockIsFree( $lockName, $method ) {
|
|
// RDBMs methods for checking named locks may or may not count this thread itself.
|
|
// In MySQL, IS_FREE_LOCK() returns 0 if the thread already has the lock. This is
|
|
// the behavior chosen by the interface for this method.
|
|
return !isset( $this->sessionNamedLocks[$lockName] );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function lock( $lockName, $method, $timeout = 5 ) {
|
|
$this->sessionNamedLocks[$lockName] = 1;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function unlock( $lockName, $method ) {
|
|
unset( $this->sessionNamedLocks[$lockName] );
|
|
|
|
return true;
|
|
}
|
|
|
|
public function getScopedLockAndFlush( $lockKey, $fname, $timeout ) {
|
|
if ( $this->writesOrCallbacksPending() ) {
|
|
// This only flushes transactions to clear snapshots, not to write data
|
|
$fnames = implode( ', ', $this->pendingWriteAndCallbackCallers() );
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
"$fname: Cannot flush pre-lock snapshot; " .
|
|
"writes from transaction {$this->trxFname} are still pending ($fnames)"
|
|
);
|
|
}
|
|
|
|
if ( !$this->lock( $lockKey, $fname, $timeout ) ) {
|
|
return null;
|
|
}
|
|
|
|
$unlocker = new ScopedCallback( function () use ( $lockKey, $fname ) {
|
|
if ( $this->trxLevel() ) {
|
|
// There is a good chance an exception was thrown, causing any early return
|
|
// from the caller. Let any error handler get a chance to issue rollback().
|
|
// If there isn't one, let the error bubble up and trigger server-side rollback.
|
|
$this->onTransactionResolution(
|
|
function () use ( $lockKey, $fname ) {
|
|
$this->unlock( $lockKey, $fname );
|
|
},
|
|
$fname
|
|
);
|
|
} else {
|
|
$this->unlock( $lockKey, $fname );
|
|
}
|
|
} );
|
|
|
|
$this->commit( $fname, self::FLUSHING_INTERNAL );
|
|
|
|
return $unlocker;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function namedLocksEnqueue() {
|
|
return false;
|
|
}
|
|
|
|
public function tableLocksHaveTransactionScope() {
|
|
return true;
|
|
}
|
|
|
|
final public function lockTables( array $read, array $write, $method ) {
|
|
if ( $this->writesOrCallbacksPending() ) {
|
|
throw new DBUnexpectedError( $this, "Transaction writes or callbacks still pending" );
|
|
}
|
|
|
|
if ( $this->tableLocksHaveTransactionScope() ) {
|
|
$this->startAtomic( $method );
|
|
}
|
|
|
|
return $this->doLockTables( $read, $write, $method );
|
|
}
|
|
|
|
/**
|
|
* Helper function for lockTables() that handles the actual table locking
|
|
*
|
|
* @stable to override
|
|
* @param array $read Array of tables to lock for read access
|
|
* @param array $write Array of tables to lock for write access
|
|
* @param string $method Name of caller
|
|
* @return true
|
|
*/
|
|
protected function doLockTables( array $read, array $write, $method ) {
|
|
return true;
|
|
}
|
|
|
|
final public function unlockTables( $method ) {
|
|
if ( $this->tableLocksHaveTransactionScope() ) {
|
|
$this->endAtomic( $method );
|
|
|
|
return true; // locks released on COMMIT/ROLLBACK
|
|
}
|
|
|
|
return $this->doUnlockTables( $method );
|
|
}
|
|
|
|
/**
|
|
* Helper function for unlockTables() that handles the actual table unlocking
|
|
*
|
|
* @stable to override
|
|
* @param string $method Name of caller
|
|
* @return true
|
|
*/
|
|
protected function doUnlockTables( $method ) {
|
|
return true;
|
|
}
|
|
|
|
public function dropTable( $table, $fname = __METHOD__ ) {
|
|
if ( !$this->tableExists( $table, $fname ) ) {
|
|
return false;
|
|
}
|
|
|
|
$this->doDropTable( $table, $fname );
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @see Database::dropTable()
|
|
* @stable to override
|
|
* @param string $table
|
|
* @param string $fname
|
|
*/
|
|
protected function doDropTable( $table, $fname ) {
|
|
// https://mariadb.com/kb/en/drop-table/
|
|
// https://dev.mysql.com/doc/refman/8.0/en/drop-table.html
|
|
// https://www.postgresql.org/docs/9.2/sql-truncate.html
|
|
$sql = "DROP TABLE " . $this->tableName( $table ) . " CASCADE";
|
|
$this->query( $sql, $fname, self::QUERY_IGNORE_DBO_TRX );
|
|
}
|
|
|
|
public function truncate( $tables, $fname = __METHOD__ ) {
|
|
$tables = is_array( $tables ) ? $tables : [ $tables ];
|
|
|
|
$tablesTruncate = [];
|
|
foreach ( $tables as $table ) {
|
|
// Skip TEMPORARY tables with no writes nor sequence updates detected.
|
|
// This mostly is an optimization for integration testing.
|
|
if ( !$this->isPristineTemporaryTable( $table ) ) {
|
|
$tablesTruncate[] = $table;
|
|
}
|
|
}
|
|
|
|
if ( $tablesTruncate ) {
|
|
$this->doTruncate( $tablesTruncate, $fname );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @see Database::truncate()
|
|
* @stable to override
|
|
* @param string[] $tables
|
|
* @param string $fname
|
|
*/
|
|
protected function doTruncate( array $tables, $fname ) {
|
|
foreach ( $tables as $table ) {
|
|
$sql = "TRUNCATE TABLE " . $this->tableName( $table );
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_SCHEMA );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function getInfinity() {
|
|
return 'infinity';
|
|
}
|
|
|
|
public function encodeExpiry( $expiry ) {
|
|
return ( $expiry == '' || $expiry == 'infinity' || $expiry == $this->getInfinity() )
|
|
? $this->getInfinity()
|
|
: $this->timestamp( $expiry );
|
|
}
|
|
|
|
public function decodeExpiry( $expiry, $format = TS_MW ) {
|
|
if ( $expiry == '' || $expiry == 'infinity' || $expiry == $this->getInfinity() ) {
|
|
return 'infinity';
|
|
}
|
|
|
|
return ConvertibleTimestamp::convert( $format, $expiry );
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function setBigSelects( $value = true ) {
|
|
// no-op
|
|
}
|
|
|
|
public function isReadOnly() {
|
|
return ( $this->getReadOnlyReason() !== false );
|
|
}
|
|
|
|
/**
|
|
* @return array|bool Tuple of (read-only reason, "role" or "lb") or false if it is not
|
|
*/
|
|
protected function getReadOnlyReason() {
|
|
if ( $this->topologyRole === self::ROLE_STREAMING_REPLICA ) {
|
|
return [ 'Server is configured as a read-only replica database.', 'role' ];
|
|
} elseif ( $this->topologyRole === self::ROLE_STATIC_CLONE ) {
|
|
return [ 'Server is configured as a read-only static clone database.', 'role' ];
|
|
}
|
|
|
|
$reason = $this->getLBInfo( self::LB_READ_ONLY_REASON );
|
|
if ( is_string( $reason ) ) {
|
|
return [ $reason, 'lb' ];
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function setTableAliases( array $aliases ) {
|
|
$this->tableAliases = $aliases;
|
|
}
|
|
|
|
/**
|
|
* @inheritDoc
|
|
* @stable to override
|
|
*/
|
|
public function setIndexAliases( array $aliases ) {
|
|
$this->indexAliases = $aliases;
|
|
}
|
|
|
|
/**
|
|
* @param int $flags A bitfield of flags
|
|
* @param int $bit Bit flag constant
|
|
* @return bool Whether the bit field has the specified bit flag set
|
|
* @since 1.34
|
|
*/
|
|
final protected function fieldHasBit( int $flags, int $bit ) {
|
|
return ( ( $flags & $bit ) === $bit );
|
|
}
|
|
|
|
/**
|
|
* Get the underlying binding connection handle
|
|
*
|
|
* Makes sure the connection resource is set (disconnects and ping() failure can unset it).
|
|
* This catches broken callers than catch and ignore disconnection exceptions.
|
|
* Unlike checking isOpen(), this is safe to call inside of open().
|
|
*
|
|
* @stable to override
|
|
* @return mixed
|
|
* @throws DBUnexpectedError
|
|
* @since 1.26
|
|
*/
|
|
protected function getBindingHandle() {
|
|
if ( !$this->conn ) {
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
'DB connection was already closed or the connection dropped'
|
|
);
|
|
}
|
|
|
|
return $this->conn;
|
|
}
|
|
|
|
public function __toString() {
|
|
// spl_object_id is PHP >= 7.2
|
|
$id = function_exists( 'spl_object_id' )
|
|
? spl_object_id( $this )
|
|
: spl_object_hash( $this );
|
|
|
|
$description = $this->getType() . ' object #' . $id;
|
|
if ( is_resource( $this->conn ) ) {
|
|
$description .= ' (' . (string)$this->conn . ')'; // "resource id #<ID>"
|
|
} elseif ( is_object( $this->conn ) ) {
|
|
// spl_object_id is PHP >= 7.2
|
|
$handleId = function_exists( 'spl_object_id' )
|
|
? spl_object_id( $this->conn )
|
|
: spl_object_hash( $this->conn );
|
|
$description .= " (handle id #$handleId)";
|
|
}
|
|
|
|
return $description;
|
|
}
|
|
|
|
/**
|
|
* Make sure that copies do not share the same client binding handle
|
|
* @throws DBConnectionError
|
|
*/
|
|
public function __clone() {
|
|
$this->connLogger->warning(
|
|
"Cloning " . static::class . " is not recommended; forking connection",
|
|
[ 'exception' => new RuntimeException() ]
|
|
);
|
|
|
|
if ( $this->isOpen() ) {
|
|
// Open a new connection resource without messing with the old one
|
|
$this->conn = null;
|
|
$this->trxEndCallbacks = []; // don't copy
|
|
$this->trxSectionCancelCallbacks = []; // don't copy
|
|
$this->handleSessionLossPreconnect(); // no trx or locks anymore
|
|
$this->open(
|
|
$this->server,
|
|
$this->user,
|
|
$this->password,
|
|
$this->currentDomain->getDatabase(),
|
|
$this->currentDomain->getSchema(),
|
|
$this->tablePrefix()
|
|
);
|
|
$this->lastPing = microtime( true );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Called by serialize. Throw an exception when DB connection is serialized.
|
|
* This causes problems on some database engines because the connection is
|
|
* not restored on unserialize.
|
|
*/
|
|
public function __sleep() {
|
|
throw new RuntimeException( 'Database serialization may cause problems, since ' .
|
|
'the connection is not restored on wakeup' );
|
|
}
|
|
|
|
/**
|
|
* Run a few simple sanity checks and close dangling connections
|
|
*/
|
|
public function __destruct() {
|
|
if ( $this->trxLevel() && $this->trxDoneWrites ) {
|
|
trigger_error( "Uncommitted DB writes (transaction from {$this->trxFname})" );
|
|
}
|
|
|
|
$danglingWriters = $this->pendingWriteAndCallbackCallers();
|
|
if ( $danglingWriters ) {
|
|
$fnames = implode( ', ', $danglingWriters );
|
|
trigger_error( "DB transaction writes or callbacks still pending ($fnames)" );
|
|
}
|
|
|
|
if ( $this->conn ) {
|
|
// Avoid connection leaks for sanity. Normally, resources close at script completion.
|
|
// The connection might already be closed in PHP by now, so suppress warnings.
|
|
AtEase::suppressWarnings();
|
|
$this->closeConnection();
|
|
AtEase::restoreWarnings();
|
|
$this->conn = null;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @deprecated since 1.28
|
|
*/
|
|
class_alias( Database::class, 'DatabaseBase' );
|
|
|
|
/**
|
|
* @deprecated since 1.29
|
|
*/
|
|
class_alias( Database::class, 'Database' );
|