1194 lines
33 KiB
PHP
1194 lines
33 KiB
PHP
<?php
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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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*/
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namespace Wikimedia\Rdbms;
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use RuntimeException;
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use Wikimedia\Rdbms\Platform\PostgresPlatform;
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use Wikimedia\WaitConditionLoop;
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/**
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* Postgres database abstraction layer.
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*
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* @ingroup Database
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*/
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class DatabasePostgres extends Database {
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/** @var int */
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private $port;
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/** @var string */
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private $tempSchema;
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/** @var null|string[] Map of (reserved table name => alternate table name) */
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private $keywordTableMap;
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/** @var float|string */
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private $numericVersion;
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/** @var resource|null */
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private $lastResultHandle;
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/** @var PostgresPlatform */
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protected $platform;
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/**
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* @see Database::__construct()
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* @param array $params Additional parameters include:
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* - port: A port to append to the hostname
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* - keywordTableMap : Map of reserved table names to alternative table names to use
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* This is is deprecated since 1.37. Reserved identifiers should be quoted where necessary,
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*/
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public function __construct( array $params ) {
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$this->port = intval( $params['port'] ?? null );
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if ( isset( $params['keywordTableMap'] ) ) {
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wfDeprecatedMsg( 'Passing keywordTableMap parameter to ' .
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'DatabasePostgres::__construct() is deprecated', '1.37'
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);
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$this->keywordTableMap = $params['keywordTableMap'];
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}
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parent::__construct( $params );
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$this->platform = new PostgresPlatform(
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$this,
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$params['queryLogger'],
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$this->currentDomain,
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$this->errorLogger
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);
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}
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public function getType() {
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return 'postgres';
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}
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protected function open( $server, $user, $password, $db, $schema, $tablePrefix ) {
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if ( !function_exists( 'pg_connect' ) ) {
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throw $this->newExceptionAfterConnectError(
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"Postgres functions missing, have you compiled PHP with the --with-pgsql\n" .
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"option? (Note: if you recently installed PHP, you may need to restart your\n" .
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"webserver and database)"
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);
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}
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$this->close( __METHOD__ );
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$connectVars = [
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// A database must be specified in order to connect to Postgres. If $dbName is not
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// specified, then use the standard "postgres" database that should exist by default.
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'dbname' => strlen( $db ) ? $db : 'postgres',
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'user' => $user,
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'password' => $password
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];
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if ( strlen( $server ) ) {
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$connectVars['host'] = $server;
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}
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if ( $this->port > 0 ) {
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$connectVars['port'] = $this->port;
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}
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if ( $this->ssl ) {
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$connectVars['sslmode'] = 'require';
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}
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$connectString = $this->makeConnectionString( $connectVars );
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$this->installErrorHandler();
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try {
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$this->conn = pg_connect( $connectString, PGSQL_CONNECT_FORCE_NEW ) ?: null;
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} catch ( RuntimeException $e ) {
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$this->restoreErrorHandler();
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throw $this->newExceptionAfterConnectError( $e->getMessage() );
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}
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$error = $this->restoreErrorHandler();
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if ( !$this->conn ) {
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throw $this->newExceptionAfterConnectError( $error ?: $this->lastError() );
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}
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try {
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// Since no transaction is active at this point, any SET commands should apply
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// for the entire session (e.g. will not be reverted on transaction rollback).
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// See https://www.postgresql.org/docs/8.3/sql-set.html
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$variables = [
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'client_encoding' => 'UTF8',
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'datestyle' => 'ISO, YMD',
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'timezone' => 'GMT',
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'standard_conforming_strings' => 'on',
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'bytea_output' => 'escape',
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'client_min_messages' => 'ERROR'
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];
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foreach ( $variables as $var => $val ) {
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$this->query(
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'SET ' . $this->platform->addIdentifierQuotes( $var ) . ' = ' . $this->addQuotes( $val ),
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__METHOD__,
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self::QUERY_NO_RETRY | self::QUERY_CHANGE_TRX
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);
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}
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$this->determineCoreSchema( $schema );
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$this->currentDomain = new DatabaseDomain( $db, $schema, $tablePrefix );
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$this->platform->setCurrentDomain( $this->currentDomain );
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} catch ( RuntimeException $e ) {
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throw $this->newExceptionAfterConnectError( $e->getMessage() );
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}
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}
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public function databasesAreIndependent() {
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return true;
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}
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public function doSelectDomain( DatabaseDomain $domain ) {
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if ( $this->getDBname() !== $domain->getDatabase() ) {
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// Postgres doesn't support selectDB in the same way MySQL does.
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// So if the DB name doesn't match the open connection, open a new one
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$this->open(
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$this->connectionParams[self::CONN_HOST],
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$this->connectionParams[self::CONN_USER],
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$this->connectionParams[self::CONN_PASSWORD],
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$domain->getDatabase(),
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$domain->getSchema(),
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$domain->getTablePrefix()
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);
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} else {
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$this->currentDomain = $domain;
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$this->platform->setCurrentDomain( $this->currentDomain );
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}
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return true;
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}
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/**
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* @param string[] $vars
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* @return string
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*/
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private function makeConnectionString( $vars ) {
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$s = '';
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foreach ( $vars as $name => $value ) {
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$s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
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}
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return $s;
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}
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protected function closeConnection() {
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return $this->conn ? pg_close( $this->conn ) : true;
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}
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public function doSingleStatementQuery( string $sql ): QueryStatus {
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$conn = $this->getBindingHandle();
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$sql = mb_convert_encoding( $sql, 'UTF-8' );
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// Clear any previously left over result
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while ( $priorRes = pg_get_result( $conn ) ) {
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pg_free_result( $priorRes );
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}
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if ( pg_send_query( $conn, $sql ) === false ) {
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throw new DBUnexpectedError( $this, "Unable to post new query to PostgreSQL\n" );
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}
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// Newer PHP versions use PgSql\Result instead of resource variables
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// https://www.php.net/manual/en/function.pg-get-result.php
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$pgRes = pg_get_result( $conn );
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$this->lastResultHandle = $pgRes;
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$res = pg_result_error( $pgRes ) ? false : $pgRes;
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return new QueryStatus(
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is_bool( $res ) ? $res : new PostgresResultWrapper( $this, $conn, $res ),
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$this->affectedRows(),
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$this->lastError(),
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$this->lastErrno()
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);
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}
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protected function doMultiStatementQuery( array $sqls ): array {
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$qsByStatementId = [];
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$conn = $this->getBindingHandle();
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// Clear any previously left over result
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while ( $pgResultSet = pg_get_result( $conn ) ) {
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pg_free_result( $pgResultSet );
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}
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$combinedSql = mb_convert_encoding( implode( ";\n", $sqls ), 'UTF-8' );
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pg_send_query( $conn, $combinedSql );
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reset( $sqls );
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while ( ( $pgResultSet = pg_get_result( $conn ) ) !== false ) {
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$this->lastResultHandle = $pgResultSet;
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$statementId = key( $sqls );
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if ( $statementId !== null ) {
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if ( pg_result_error( $pgResultSet ) ) {
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$res = false;
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} else {
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$res = new PostgresResultWrapper( $this, $conn, $pgResultSet );
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}
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$qsByStatementId[$statementId] = new QueryStatus(
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$res,
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pg_affected_rows( $pgResultSet ),
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(string)pg_result_error( $pgResultSet ),
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pg_result_error_field( $pgResultSet, PGSQL_DIAG_SQLSTATE )
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);
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}
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next( $sqls );
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}
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// Fill in status for statements aborted due to prior statement failure
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while ( ( $statementId = key( $sqls ) ) !== null ) {
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$qsByStatementId[$statementId] = new QueryStatus( false, 0, 'Query aborted', 0 );
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next( $sqls );
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}
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return $qsByStatementId;
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}
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protected function dumpError() {
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$diags = [
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PGSQL_DIAG_SEVERITY,
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PGSQL_DIAG_SQLSTATE,
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PGSQL_DIAG_MESSAGE_PRIMARY,
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PGSQL_DIAG_MESSAGE_DETAIL,
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PGSQL_DIAG_MESSAGE_HINT,
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PGSQL_DIAG_STATEMENT_POSITION,
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PGSQL_DIAG_INTERNAL_POSITION,
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PGSQL_DIAG_INTERNAL_QUERY,
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PGSQL_DIAG_CONTEXT,
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PGSQL_DIAG_SOURCE_FILE,
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PGSQL_DIAG_SOURCE_LINE,
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PGSQL_DIAG_SOURCE_FUNCTION
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];
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foreach ( $diags as $d ) {
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$this->queryLogger->debug( sprintf( "PgSQL ERROR(%d): %s",
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$d, pg_result_error_field( $this->lastResultHandle, $d ) ) );
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}
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}
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public function insertId() {
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$res = $this->query(
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"SELECT lastval()",
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__METHOD__,
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self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
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);
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$row = $res->fetchRow();
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// @phan-suppress-next-line PhanTypeMismatchReturnProbablyReal Return type is undefined for no lastval
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return $row[0] === null ? null : (int)$row[0];
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}
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public function lastError() {
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if ( $this->conn ) {
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if ( $this->lastResultHandle ) {
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return pg_result_error( $this->lastResultHandle );
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} else {
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return pg_last_error();
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}
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}
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return $this->getLastPHPError() ?: 'No database connection';
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}
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public function lastErrno() {
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if ( $this->lastResultHandle ) {
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$lastErrno = pg_result_error_field( $this->lastResultHandle, PGSQL_DIAG_SQLSTATE );
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if ( $lastErrno !== false ) {
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return $lastErrno;
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}
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}
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return '00000';
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}
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protected function fetchAffectedRowCount() {
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if ( !$this->lastResultHandle ) {
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return 0;
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}
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return pg_affected_rows( $this->lastResultHandle );
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}
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/**
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* Estimate rows in dataset
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* Returns estimated count, based on EXPLAIN output
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* This is not necessarily an accurate estimate, so use sparingly
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* Returns -1 if count cannot be found
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* Takes same arguments as Database::select()
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*
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* @param string $table
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* @param string $var
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* @param string $conds
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* @param string $fname
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* @param array $options
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* @param array $join_conds
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* @return int
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*/
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public function estimateRowCount( $table, $var = '*', $conds = '',
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$fname = __METHOD__, $options = [], $join_conds = []
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) {
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$conds = $this->platform->normalizeConditions( $conds, $fname );
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$column = $this->platform->extractSingleFieldFromList( $var );
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if ( is_string( $column ) && !in_array( $column, [ '*', '1' ] ) ) {
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$conds[] = "$column IS NOT NULL";
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}
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$options['EXPLAIN'] = true;
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$res = $this->select( $table, $var, $conds, $fname, $options, $join_conds );
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$rows = -1;
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if ( $res ) {
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$row = $res->fetchRow();
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$count = [];
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if ( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
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$rows = (int)$count[1];
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}
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}
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return $rows;
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}
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public function indexInfo( $table, $index, $fname = __METHOD__ ) {
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$res = $this->query(
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"SELECT indexname FROM pg_indexes WHERE tablename='$table'",
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$fname,
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self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
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);
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if ( !$res ) {
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return null;
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}
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foreach ( $res as $row ) {
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if ( $row->indexname == $this->indexName( $index ) ) {
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return $row;
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}
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}
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return false;
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}
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public function indexAttributes( $index, $schema = false ) {
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if ( $schema === false ) {
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$schemas = $this->getCoreSchemas();
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} else {
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$schemas = [ $schema ];
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}
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$eindex = $this->addQuotes( $index );
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$flags = self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE;
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foreach ( $schemas as $schema ) {
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$eschema = $this->addQuotes( $schema );
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/*
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* A subquery would be not needed if we didn't care about the order
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* of attributes, but we do
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*/
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$sql = <<<__INDEXATTR__
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SELECT opcname,
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attname,
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i.indoption[s.g] as option,
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pg_am.amname
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FROM
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(SELECT generate_series(array_lower(isub.indkey,1), array_upper(isub.indkey,1)) AS g
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FROM
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pg_index isub
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JOIN pg_class cis
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ON cis.oid=isub.indexrelid
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JOIN pg_namespace ns
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ON cis.relnamespace = ns.oid
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WHERE cis.relname=$eindex AND ns.nspname=$eschema) AS s,
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pg_attribute,
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pg_opclass opcls,
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pg_am,
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pg_class ci
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JOIN pg_index i
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ON ci.oid=i.indexrelid
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JOIN pg_class ct
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ON ct.oid = i.indrelid
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JOIN pg_namespace n
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ON ci.relnamespace = n.oid
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WHERE
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ci.relname=$eindex AND n.nspname=$eschema
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AND attrelid = ct.oid
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AND i.indkey[s.g] = attnum
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AND i.indclass[s.g] = opcls.oid
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AND pg_am.oid = opcls.opcmethod
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__INDEXATTR__;
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$res = $this->query( $sql, __METHOD__, $flags );
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$a = [];
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if ( $res ) {
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foreach ( $res as $row ) {
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$a[] = [
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$row->attname,
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$row->opcname,
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$row->amname,
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$row->option ];
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}
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return $a;
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}
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}
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return null;
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}
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public function indexUnique( $table, $index, $fname = __METHOD__ ) {
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$flags = self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE;
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$sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'" .
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" AND indexdef LIKE 'CREATE UNIQUE%(" .
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$this->strencode( $this->indexName( $index ) ) .
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")'";
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$res = $this->query( $sql, $fname, $flags );
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if ( !$res ) {
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return false;
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}
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return $res->numRows() > 0;
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}
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|
|
/**
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* INSERT SELECT wrapper
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* $varMap must be an associative array of the form [ 'dest1' => 'source1', ... ]
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* Source items may be literals rather then field names, but strings should
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* be quoted with Database::addQuotes()
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* $conds may be "*" to copy the whole table
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* srcTable may be an array of tables.
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|
* @todo FIXME: Implement this a little better (separate select/insert)?
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*
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* @param string $destTable
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* @param array|string $srcTable
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|
* @param array $varMap
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|
* @param array $conds
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|
* @param string $fname
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|
* @param array $insertOptions
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* @param array $selectOptions
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|
* @param array $selectJoinConds
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|
*/
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|
protected function doInsertSelectNative(
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$destTable,
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$srcTable,
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array $varMap,
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$conds,
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$fname,
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array $insertOptions,
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array $selectOptions,
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$selectJoinConds
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) {
|
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if ( in_array( 'IGNORE', $insertOptions ) ) {
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// Use "ON CONFLICT DO" if we have it for IGNORE
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$destTable = $this->tableName( $destTable );
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$selectSql = $this->selectSQLText(
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$srcTable,
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array_values( $varMap ),
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$conds,
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$fname,
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$selectOptions,
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$selectJoinConds
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);
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|
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$sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ') ' .
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$selectSql . ' ON CONFLICT DO NOTHING';
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$this->query( $sql, $fname, self::QUERY_CHANGE_ROWS );
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} else {
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parent::doInsertSelectNative( $destTable, $srcTable, $varMap, $conds, $fname,
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$insertOptions, $selectOptions, $selectJoinConds );
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|
}
|
|
}
|
|
|
|
/**
|
|
* @param string $name
|
|
* @return string Value of $name or remapped name if $name is a reserved keyword
|
|
* @deprecated since 1.37. Reserved identifiers should be quoted where necessary
|
|
*/
|
|
public function remappedTableName( $name ) {
|
|
wfDeprecated( __METHOD__, '1.37' );
|
|
|
|
return $this->keywordTableMap[$name] ?? $name;
|
|
}
|
|
|
|
/**
|
|
* @param string $name
|
|
* @param string $format
|
|
* @return string Qualified and encoded (if requested) table name
|
|
*/
|
|
public function realTableName( $name, $format = 'quoted' ) {
|
|
return parent::tableName( $name, $format );
|
|
}
|
|
|
|
public function nextSequenceValue( $seqName ) {
|
|
return new NextSequenceValue;
|
|
}
|
|
|
|
/**
|
|
* Return the current value of a sequence. Assumes it has been nextval'ed in this session.
|
|
*
|
|
* @param string $seqName
|
|
* @return int
|
|
*/
|
|
public function currentSequenceValue( $seqName ) {
|
|
$res = $this->query(
|
|
"SELECT currval('" . str_replace( "'", "''", $seqName ) . "')",
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
$row = $res->fetchRow();
|
|
$currval = $row[0];
|
|
|
|
return $currval;
|
|
}
|
|
|
|
public function textFieldSize( $table, $field ) {
|
|
$flags = self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE;
|
|
$encTable = $this->tableName( $table );
|
|
$sql = "SELECT t.typname as ftype,a.atttypmod as size
|
|
FROM pg_class c, pg_attribute a, pg_type t
|
|
WHERE relname='$encTable' AND a.attrelid=c.oid AND
|
|
a.atttypid=t.oid and a.attname='$field'";
|
|
$res = $this->query( $sql, __METHOD__, $flags );
|
|
$row = $res->fetchObject();
|
|
if ( $row->ftype == 'varchar' ) {
|
|
$size = $row->size - 4;
|
|
} else {
|
|
$size = $row->size;
|
|
}
|
|
|
|
return $size;
|
|
}
|
|
|
|
public function wasDeadlock() {
|
|
// https://www.postgresql.org/docs/9.2/static/errcodes-appendix.html
|
|
return $this->lastErrno() === '40P01';
|
|
}
|
|
|
|
public function wasLockTimeout() {
|
|
// https://www.postgresql.org/docs/9.2/static/errcodes-appendix.html
|
|
return $this->lastErrno() === '55P03';
|
|
}
|
|
|
|
protected function isConnectionError( $errno ) {
|
|
// https://www.postgresql.org/docs/9.2/static/errcodes-appendix.html
|
|
static $codes = [ '08000', '08003', '08006', '08001', '08004', '57P01', '57P03', '53300' ];
|
|
|
|
return in_array( $errno, $codes, true );
|
|
}
|
|
|
|
protected function isQueryTimeoutError( $errno ) {
|
|
// https://www.postgresql.org/docs/9.2/static/errcodes-appendix.html
|
|
return ( $errno === '57014' );
|
|
}
|
|
|
|
protected function isKnownStatementRollbackError( $errno ) {
|
|
return false; // transaction has to be rolled-back from error state
|
|
}
|
|
|
|
public function duplicateTableStructure(
|
|
$oldName, $newName, $temporary = false, $fname = __METHOD__
|
|
) {
|
|
$newNameE = $this->platform->addIdentifierQuotes( $newName );
|
|
$oldNameE = $this->platform->addIdentifierQuotes( $oldName );
|
|
|
|
$temporary = $temporary ? 'TEMPORARY' : '';
|
|
|
|
$ret = $this->query(
|
|
"CREATE $temporary TABLE $newNameE " .
|
|
"(LIKE $oldNameE INCLUDING DEFAULTS INCLUDING INDEXES)",
|
|
$fname,
|
|
self::QUERY_PSEUDO_PERMANENT | self::QUERY_CHANGE_SCHEMA
|
|
);
|
|
if ( !$ret ) {
|
|
return $ret;
|
|
}
|
|
|
|
$res = $this->query(
|
|
'SELECT attname FROM pg_class c'
|
|
. ' JOIN pg_namespace n ON (n.oid = c.relnamespace)'
|
|
. ' JOIN pg_attribute a ON (a.attrelid = c.oid)'
|
|
. ' JOIN pg_attrdef d ON (c.oid=d.adrelid and a.attnum=d.adnum)'
|
|
. ' WHERE relkind = \'r\''
|
|
. ' AND nspname = ' . $this->addQuotes( $this->getCoreSchema() )
|
|
. ' AND relname = ' . $this->addQuotes( $oldName )
|
|
. ' AND pg_get_expr(adbin, adrelid) LIKE \'nextval(%\'',
|
|
$fname,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
$row = $res->fetchObject();
|
|
if ( $row ) {
|
|
$field = $row->attname;
|
|
$newSeq = "{$newName}_{$field}_seq";
|
|
$fieldE = $this->platform->addIdentifierQuotes( $field );
|
|
$newSeqE = $this->platform->addIdentifierQuotes( $newSeq );
|
|
$newSeqQ = $this->addQuotes( $newSeq );
|
|
$this->query(
|
|
"CREATE $temporary SEQUENCE $newSeqE OWNED BY $newNameE.$fieldE",
|
|
$fname,
|
|
self::QUERY_CHANGE_SCHEMA
|
|
);
|
|
$this->query(
|
|
"ALTER TABLE $newNameE ALTER COLUMN $fieldE SET DEFAULT nextval({$newSeqQ}::regclass)",
|
|
$fname,
|
|
self::QUERY_CHANGE_SCHEMA
|
|
);
|
|
}
|
|
|
|
return $ret;
|
|
}
|
|
|
|
protected function doTruncate( array $tables, $fname ) {
|
|
$encTables = $this->tableNamesN( ...$tables );
|
|
$sql = "TRUNCATE TABLE " . implode( ',', $encTables ) . " RESTART IDENTITY";
|
|
$this->query( $sql, $fname, self::QUERY_CHANGE_SCHEMA );
|
|
}
|
|
|
|
/**
|
|
* @param string $prefix Only show tables with this prefix, e.g. mw_
|
|
* @param string $fname Calling function name
|
|
* @return string[]
|
|
* @suppress SecurityCheck-SQLInjection array_map not recognized T204911
|
|
*/
|
|
public function listTables( $prefix = '', $fname = __METHOD__ ) {
|
|
$eschemas = implode( ',', array_map( [ $this, 'addQuotes' ], $this->getCoreSchemas() ) );
|
|
$result = $this->query(
|
|
"SELECT DISTINCT tablename FROM pg_tables WHERE schemaname IN ($eschemas)",
|
|
$fname,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
$endArray = [];
|
|
|
|
foreach ( $result as $table ) {
|
|
$vars = get_object_vars( $table );
|
|
$table = array_pop( $vars );
|
|
if ( $prefix == '' || strpos( $table, $prefix ) === 0 ) {
|
|
$endArray[] = $table;
|
|
}
|
|
}
|
|
|
|
return $endArray;
|
|
}
|
|
|
|
/**
|
|
* Posted by cc[plus]php[at]c2se[dot]com on 25-Mar-2009 09:12
|
|
* to https://www.php.net/manual/en/ref.pgsql.php
|
|
*
|
|
* Parsing a postgres array can be a tricky problem, he's my
|
|
* take on this, it handles multi-dimensional arrays plus
|
|
* escaping using a nasty regexp to determine the limits of each
|
|
* data-item.
|
|
*
|
|
* This should really be handled by PHP PostgreSQL module
|
|
*
|
|
* @since 1.19
|
|
* @param string $text Postgreql array returned in a text form like {a,b}
|
|
* @param string[] &$output
|
|
* @param int|false $limit
|
|
* @param int $offset
|
|
* @return string[]
|
|
*/
|
|
private function pg_array_parse( $text, &$output, $limit = false, $offset = 1 ) {
|
|
if ( $limit === false ) {
|
|
$limit = strlen( $text ) - 1;
|
|
$output = [];
|
|
}
|
|
if ( $text == '{}' ) {
|
|
return $output;
|
|
}
|
|
do {
|
|
if ( $text[$offset] != '{' ) {
|
|
preg_match( "/(\\{?\"([^\"\\\\]|\\\\.)*\"|[^,{}]+)+([,}]+)/",
|
|
$text, $match, 0, $offset );
|
|
$offset += strlen( $match[0] );
|
|
$output[] = ( $match[1][0] != '"'
|
|
? $match[1]
|
|
: stripcslashes( substr( $match[1], 1, -1 ) ) );
|
|
if ( $match[3] == '},' ) {
|
|
return $output;
|
|
}
|
|
} else {
|
|
$offset = $this->pg_array_parse( $text, $output, $limit, $offset + 1 );
|
|
}
|
|
} while ( $limit > $offset );
|
|
|
|
return $output;
|
|
}
|
|
|
|
public function getSoftwareLink() {
|
|
return '[{{int:version-db-postgres-url}} PostgreSQL]';
|
|
}
|
|
|
|
/**
|
|
* Return current schema (executes SELECT current_schema())
|
|
* Needs transaction
|
|
*
|
|
* @since 1.19
|
|
* @return string Default schema for the current session
|
|
*/
|
|
public function getCurrentSchema() {
|
|
$res = $this->query(
|
|
"SELECT current_schema()",
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
$row = $res->fetchRow();
|
|
|
|
return $row[0];
|
|
}
|
|
|
|
/**
|
|
* Return list of schemas which are accessible without schema name
|
|
* This is list does not contain magic keywords like "$user"
|
|
* Needs transaction
|
|
*
|
|
* @see getSearchPath()
|
|
* @see setSearchPath()
|
|
* @since 1.19
|
|
* @return array List of actual schemas for the current session
|
|
*/
|
|
public function getSchemas() {
|
|
$res = $this->query(
|
|
"SELECT current_schemas(false)",
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
$row = $res->fetchRow();
|
|
$schemas = [];
|
|
|
|
/* PHP pgsql support does not support array type, "{a,b}" string is returned */
|
|
|
|
return $this->pg_array_parse( $row[0], $schemas );
|
|
}
|
|
|
|
/**
|
|
* Return search patch for schemas
|
|
* This is different from getSchemas() since it contain magic keywords
|
|
* (like "$user").
|
|
* Needs transaction
|
|
*
|
|
* @since 1.19
|
|
* @return array How to search for table names schemas for the current user
|
|
*/
|
|
public function getSearchPath() {
|
|
$res = $this->query(
|
|
"SHOW search_path",
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
$row = $res->fetchRow();
|
|
|
|
/* PostgreSQL returns SHOW values as strings */
|
|
|
|
return explode( ",", $row[0] );
|
|
}
|
|
|
|
/**
|
|
* Update search_path, values should already be sanitized
|
|
* Values may contain magic keywords like "$user"
|
|
* @since 1.19
|
|
*
|
|
* @param string[] $search_path List of schemas to be searched by default
|
|
*/
|
|
private function setSearchPath( $search_path ) {
|
|
$this->query(
|
|
"SET search_path = " . implode( ", ", $search_path ),
|
|
__METHOD__,
|
|
self::QUERY_CHANGE_TRX
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Determine default schema for the current application
|
|
* Adjust this session schema search path if desired schema exists
|
|
* and is not already there.
|
|
*
|
|
* We need to have name of the core schema stored to be able
|
|
* to query database metadata.
|
|
*
|
|
* This will be also called by the installer after the schema is created
|
|
*
|
|
* @since 1.19
|
|
*
|
|
* @param string $desiredSchema
|
|
*/
|
|
public function determineCoreSchema( $desiredSchema ) {
|
|
if ( $this->trxLevel() ) {
|
|
// We do not want the schema selection to change on ROLLBACK or INSERT SELECT.
|
|
// See https://www.postgresql.org/docs/8.3/sql-set.html
|
|
throw new DBUnexpectedError(
|
|
$this,
|
|
__METHOD__ . ": a transaction is currently active"
|
|
);
|
|
}
|
|
|
|
if ( $this->schemaExists( $desiredSchema ) ) {
|
|
if ( in_array( $desiredSchema, $this->getSchemas() ) ) {
|
|
$this->platform->setCoreSchema( $desiredSchema );
|
|
$this->queryLogger->debug(
|
|
"Schema \"" . $desiredSchema . "\" already in the search path\n" );
|
|
} else {
|
|
// Prepend the desired schema to the search path (T17816)
|
|
$search_path = $this->getSearchPath();
|
|
array_unshift( $search_path, $this->platform->addIdentifierQuotes( $desiredSchema ) );
|
|
$this->setSearchPath( $search_path );
|
|
$this->platform->setCoreSchema( $desiredSchema );
|
|
$this->queryLogger->debug(
|
|
"Schema \"" . $desiredSchema . "\" added to the search path\n" );
|
|
}
|
|
} else {
|
|
$this->platform->setCoreSchema( $this->getCurrentSchema() );
|
|
$this->queryLogger->debug(
|
|
"Schema \"" . $desiredSchema . "\" not found, using current \"" .
|
|
$this->getCoreSchema() . "\"\n" );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return schema name for core application tables
|
|
*
|
|
* @since 1.19
|
|
* @return string Core schema name
|
|
*/
|
|
public function getCoreSchema() {
|
|
return $this->platform->getCoreSchema();
|
|
}
|
|
|
|
/**
|
|
* Return schema names for temporary tables and core application tables
|
|
*
|
|
* @since 1.31
|
|
* @return string[] schema names
|
|
*/
|
|
public function getCoreSchemas() {
|
|
if ( $this->tempSchema ) {
|
|
return [ $this->tempSchema, $this->getCoreSchema() ];
|
|
}
|
|
|
|
$res = $this->query(
|
|
"SELECT nspname FROM pg_catalog.pg_namespace n WHERE n.oid = pg_my_temp_schema()",
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
$row = $res->fetchObject();
|
|
if ( $row ) {
|
|
$this->tempSchema = $row->nspname;
|
|
return [ $this->tempSchema, $this->getCoreSchema() ];
|
|
}
|
|
|
|
return [ $this->getCoreSchema() ];
|
|
}
|
|
|
|
public function getServerVersion() {
|
|
if ( !isset( $this->numericVersion ) ) {
|
|
$conn = $this->getBindingHandle();
|
|
$versionInfo = pg_version( $conn );
|
|
if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
|
|
// Old client, abort install
|
|
$this->numericVersion = '7.3 or earlier';
|
|
} elseif ( isset( $versionInfo['server'] ) ) {
|
|
// Normal client
|
|
$this->numericVersion = $versionInfo['server'];
|
|
} else {
|
|
// T18937: broken pgsql extension from PHP<5.3
|
|
$this->numericVersion = pg_parameter_status( $conn, 'server_version' );
|
|
}
|
|
}
|
|
|
|
return $this->numericVersion;
|
|
}
|
|
|
|
/**
|
|
* Query whether a given relation exists (in the given schema, or the
|
|
* default mw one if not given)
|
|
* @param string $table
|
|
* @param array|string $types
|
|
* @param bool|string $schema
|
|
* @return bool
|
|
*/
|
|
private function relationExists( $table, $types, $schema = false ) {
|
|
if ( !is_array( $types ) ) {
|
|
$types = [ $types ];
|
|
}
|
|
if ( $schema === false ) {
|
|
$schemas = $this->getCoreSchemas();
|
|
} else {
|
|
$schemas = [ $schema ];
|
|
}
|
|
$table = $this->realTableName( $table, 'raw' );
|
|
$etable = $this->addQuotes( $table );
|
|
foreach ( $schemas as $schema ) {
|
|
$eschema = $this->addQuotes( $schema );
|
|
$sql = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
|
|
. "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
|
|
. "AND c.relkind IN ('" . implode( "','", $types ) . "')";
|
|
$res = $this->query(
|
|
$sql,
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
if ( $res && $res->numRows() ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* For backward compatibility, this function checks both tables and views.
|
|
* @param string $table
|
|
* @param string $fname
|
|
* @param bool|string $schema
|
|
* @return bool
|
|
*/
|
|
public function tableExists( $table, $fname = __METHOD__, $schema = false ) {
|
|
return $this->relationExists( $table, [ 'r', 'v' ], $schema );
|
|
}
|
|
|
|
public function sequenceExists( $sequence, $schema = false ) {
|
|
return $this->relationExists( $sequence, 'S', $schema );
|
|
}
|
|
|
|
public function triggerExists( $table, $trigger ) {
|
|
$q = <<<SQL
|
|
SELECT 1 FROM pg_class, pg_namespace, pg_trigger
|
|
WHERE relnamespace=pg_namespace.oid AND relkind='r'
|
|
AND tgrelid=pg_class.oid
|
|
AND nspname=%s AND relname=%s AND tgname=%s
|
|
SQL;
|
|
foreach ( $this->getCoreSchemas() as $schema ) {
|
|
$res = $this->query(
|
|
sprintf(
|
|
$q,
|
|
$this->addQuotes( $schema ),
|
|
$this->addQuotes( $table ),
|
|
$this->addQuotes( $trigger )
|
|
),
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
if ( $res && $res->numRows() ) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public function ruleExists( $table, $rule ) {
|
|
$exists = $this->selectField( 'pg_rules', 'rulename',
|
|
[
|
|
'rulename' => $rule,
|
|
'tablename' => $table,
|
|
'schemaname' => $this->getCoreSchemas()
|
|
],
|
|
__METHOD__
|
|
);
|
|
|
|
return $exists === $rule;
|
|
}
|
|
|
|
public function constraintExists( $table, $constraint ) {
|
|
foreach ( $this->getCoreSchemas() as $schema ) {
|
|
$sql = sprintf( "SELECT 1 FROM information_schema.table_constraints " .
|
|
"WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
|
|
$this->addQuotes( $schema ),
|
|
$this->addQuotes( $table ),
|
|
$this->addQuotes( $constraint )
|
|
);
|
|
$res = $this->query(
|
|
$sql,
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
if ( $res && $res->numRows() ) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Query whether a given schema exists. Returns true if it does, false if it doesn't.
|
|
* @param string $schema
|
|
* @return bool
|
|
*/
|
|
public function schemaExists( $schema ) {
|
|
if ( !strlen( $schema ) ) {
|
|
return false; // short-circuit
|
|
}
|
|
|
|
$res = $this->query(
|
|
"SELECT 1 FROM pg_catalog.pg_namespace " .
|
|
"WHERE nspname = " . $this->addQuotes( $schema ) . " LIMIT 1",
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
|
|
return ( $res->numRows() > 0 );
|
|
}
|
|
|
|
/**
|
|
* Returns true if a given role (i.e. user) exists, false otherwise.
|
|
* @param string $roleName
|
|
* @return bool
|
|
*/
|
|
public function roleExists( $roleName ) {
|
|
$res = $this->query(
|
|
"SELECT 1 FROM pg_catalog.pg_roles " .
|
|
"WHERE rolname = " . $this->addQuotes( $roleName ) . " LIMIT 1",
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
|
|
return ( $res->numRows() > 0 );
|
|
}
|
|
|
|
/**
|
|
* @param string $table
|
|
* @param string $field
|
|
* @return PostgresField|null
|
|
*/
|
|
public function fieldInfo( $table, $field ) {
|
|
return PostgresField::fromText( $this, $table, $field );
|
|
}
|
|
|
|
public function encodeBlob( $b ) {
|
|
return new PostgresBlob( pg_escape_bytea( $b ) );
|
|
}
|
|
|
|
public function decodeBlob( $b ) {
|
|
if ( $b instanceof PostgresBlob ) {
|
|
$b = $b->fetch();
|
|
} elseif ( $b instanceof Blob ) {
|
|
return $b->fetch();
|
|
}
|
|
|
|
return pg_unescape_bytea( $b );
|
|
}
|
|
|
|
public function strencode( $s ) {
|
|
// Should not be called by us
|
|
return pg_escape_string( $this->getBindingHandle(), (string)$s );
|
|
}
|
|
|
|
public function addQuotes( $s ) {
|
|
$conn = $this->getBindingHandle();
|
|
|
|
if ( $s === null ) {
|
|
return 'NULL';
|
|
} elseif ( is_bool( $s ) ) {
|
|
return (string)intval( $s );
|
|
} elseif ( is_int( $s ) ) {
|
|
return (string)$s;
|
|
} elseif ( $s instanceof Blob ) {
|
|
if ( $s instanceof PostgresBlob ) {
|
|
$s = $s->fetch();
|
|
} else {
|
|
$s = pg_escape_bytea( $conn, $s->fetch() );
|
|
}
|
|
return "'$s'";
|
|
} elseif ( $s instanceof NextSequenceValue ) {
|
|
return 'DEFAULT';
|
|
}
|
|
|
|
return "'" . pg_escape_string( $conn, (string)$s ) . "'";
|
|
}
|
|
|
|
public function streamStatementEnd( &$sql, &$newLine ) {
|
|
# Allow dollar quoting for function declarations
|
|
if ( substr( $newLine, 0, 4 ) == '$mw$' ) {
|
|
if ( $this->delimiter ) {
|
|
$this->delimiter = false;
|
|
} else {
|
|
$this->delimiter = ';';
|
|
}
|
|
}
|
|
|
|
return parent::streamStatementEnd( $sql, $newLine );
|
|
}
|
|
|
|
public function doLockIsFree( string $lockName, string $method ) {
|
|
$res = $this->query(
|
|
$this->platform->lockIsFreeSQLText( $lockName ),
|
|
$method,
|
|
self::QUERY_CHANGE_LOCKS
|
|
);
|
|
$row = $res->fetchObject();
|
|
|
|
return ( $row->unlocked === 't' );
|
|
}
|
|
|
|
public function doLock( string $lockName, string $method, int $timeout ) {
|
|
$sql = $this->platform->lockSQLText( $lockName, $timeout );
|
|
|
|
$acquired = null;
|
|
$loop = new WaitConditionLoop(
|
|
function () use ( $lockName, $sql, $timeout, $method, &$acquired ) {
|
|
$res = $this->query(
|
|
$sql,
|
|
$method,
|
|
self::QUERY_CHANGE_LOCKS
|
|
);
|
|
$row = $res->fetchObject();
|
|
|
|
if ( $row->acquired !== null ) {
|
|
$acquired = (float)$row->acquired;
|
|
|
|
return WaitConditionLoop::CONDITION_REACHED;
|
|
}
|
|
|
|
return WaitConditionLoop::CONDITION_CONTINUE;
|
|
},
|
|
$timeout
|
|
);
|
|
$loop->invoke();
|
|
|
|
return $acquired;
|
|
}
|
|
|
|
public function doUnlock( string $lockName, string $method ) {
|
|
$result = $this->query(
|
|
$this->platform->unlockSQLText( $lockName ),
|
|
$method,
|
|
self::QUERY_CHANGE_LOCKS
|
|
);
|
|
$row = $result->fetchObject();
|
|
|
|
return ( $row->released === 't' );
|
|
}
|
|
|
|
protected function doFlushSession( $fname ) {
|
|
$flags = self::QUERY_CHANGE_LOCKS | self::QUERY_NO_RETRY;
|
|
|
|
// https://www.postgresql.org/docs/9.1/functions-admin.html
|
|
$sql = "pg_advisory_unlock_all()";
|
|
$qs = $this->executeQuery( $sql, __METHOD__, $flags, $sql );
|
|
if ( $qs->res === false ) {
|
|
$this->reportQueryError( $qs->message, $qs->code, $sql, $fname, true );
|
|
}
|
|
}
|
|
|
|
public function serverIsReadOnly() {
|
|
$res = $this->query(
|
|
"SHOW default_transaction_read_only",
|
|
__METHOD__,
|
|
self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE
|
|
);
|
|
$row = $res->fetchObject();
|
|
|
|
return $row ? ( strtolower( $row->default_transaction_read_only ) === 'on' ) : false;
|
|
}
|
|
|
|
public static function getAttributes() {
|
|
return [ self::ATTR_SCHEMAS_AS_TABLE_GROUPS => true ];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @deprecated since 1.29
|
|
*/
|
|
class_alias( DatabasePostgres::class, 'DatabasePostgres' );
|