1030 lines
26 KiB
PHP
1030 lines
26 KiB
PHP
<?php
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/**
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* This is the Postgres database abstraction layer.
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*
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* @file
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* @ingroup Database
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*/
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class PostgresField implements Field {
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private $name, $tablename, $type, $nullable, $max_length, $deferred, $deferrable, $conname;
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/**
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* @param $db DatabaseBase
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* @param $table
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* @param $field
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* @return null|PostgresField
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*/
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static function fromText( $db, $table, $field ) {
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global $wgDBmwschema;
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$q = <<<SQL
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SELECT
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attnotnull, attlen, COALESCE(conname, '') AS conname,
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COALESCE(condeferred, 'f') AS deferred,
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COALESCE(condeferrable, 'f') AS deferrable,
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CASE WHEN typname = 'int2' THEN 'smallint'
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WHEN typname = 'int4' THEN 'integer'
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WHEN typname = 'int8' THEN 'bigint'
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WHEN typname = 'bpchar' THEN 'char'
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ELSE typname END AS typname
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FROM pg_class c
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JOIN pg_namespace n ON (n.oid = c.relnamespace)
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JOIN pg_attribute a ON (a.attrelid = c.oid)
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JOIN pg_type t ON (t.oid = a.atttypid)
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LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
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WHERE relkind = 'r'
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AND nspname=%s
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AND relname=%s
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AND attname=%s;
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SQL;
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$table = $db->tableName( $table, 'raw' );
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$res = $db->query(
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sprintf( $q,
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$db->addQuotes( $wgDBmwschema ),
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$db->addQuotes( $table ),
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$db->addQuotes( $field )
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)
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);
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$row = $db->fetchObject( $res );
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if ( !$row ) {
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return null;
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}
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$n = new PostgresField;
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$n->type = $row->typname;
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$n->nullable = ( $row->attnotnull == 'f' );
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$n->name = $field;
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$n->tablename = $table;
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$n->max_length = $row->attlen;
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$n->deferrable = ( $row->deferrable == 't' );
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$n->deferred = ( $row->deferred == 't' );
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$n->conname = $row->conname;
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return $n;
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}
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function name() {
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return $this->name;
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}
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function tableName() {
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return $this->tablename;
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}
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function type() {
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return $this->type;
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}
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function isNullable() {
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return $this->nullable;
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}
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function maxLength() {
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return $this->max_length;
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}
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function is_deferrable() {
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return $this->deferrable;
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}
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function is_deferred() {
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return $this->deferred;
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}
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function conname() {
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return $this->conname;
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}
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}
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/**
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* @ingroup Database
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*/
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class DatabasePostgres extends DatabaseBase {
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var $mInsertId = null;
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var $mLastResult = null;
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var $numeric_version = null;
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var $mAffectedRows = null;
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function getType() {
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return 'postgres';
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}
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function cascadingDeletes() {
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return true;
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}
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function cleanupTriggers() {
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return true;
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}
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function strictIPs() {
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return true;
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}
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function realTimestamps() {
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return true;
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}
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function implicitGroupby() {
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return false;
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}
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function implicitOrderby() {
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return false;
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}
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function searchableIPs() {
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return true;
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}
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function functionalIndexes() {
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return true;
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}
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function hasConstraint( $name ) {
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global $wgDBmwschema;
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$SQL = "SELECT 1 FROM pg_catalog.pg_constraint c, pg_catalog.pg_namespace n WHERE c.connamespace = n.oid AND conname = '" .
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pg_escape_string( $this->mConn, $name ) . "' AND n.nspname = '" . pg_escape_string( $this->mConn, $wgDBmwschema ) ."'";
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$res = $this->doQuery( $SQL );
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return $this->numRows( $res );
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}
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/**
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* Usually aborts on failure
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* @return DatabaseBase|null
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*/
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function open( $server, $user, $password, $dbName ) {
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# Test for Postgres support, to avoid suppressed fatal error
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if ( !function_exists( 'pg_connect' ) ) {
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throw new DBConnectionError( $this, "Postgres functions missing, have you compiled PHP with the --with-pgsql option?\n (Note: if you recently installed PHP, you may need to restart your webserver and database)\n" );
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}
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global $wgDBport;
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if ( !strlen( $user ) ) { # e.g. the class is being loaded
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return;
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}
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$this->close();
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$this->mServer = $server;
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$port = $wgDBport;
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$this->mUser = $user;
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$this->mPassword = $password;
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$this->mDBname = $dbName;
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$connectVars = array(
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'dbname' => $dbName,
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'user' => $user,
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'password' => $password
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);
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if ( $server != false && $server != '' ) {
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$connectVars['host'] = $server;
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}
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if ( $port != false && $port != '' ) {
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$connectVars['port'] = $port;
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}
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$connectString = $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW );
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$this->installErrorHandler();
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$this->mConn = pg_connect( $connectString );
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$phpError = $this->restoreErrorHandler();
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if ( !$this->mConn ) {
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wfDebug( "DB connection error\n" );
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wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
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wfDebug( $this->lastError() . "\n" );
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throw new DBConnectionError( $this, str_replace( "\n", ' ', $phpError ) );
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}
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$this->mOpened = true;
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global $wgCommandLineMode;
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# If called from the command-line (e.g. importDump), only show errors
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if ( $wgCommandLineMode ) {
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$this->doQuery( "SET client_min_messages = 'ERROR'" );
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}
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$this->query( "SET client_encoding='UTF8'", __METHOD__ );
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$this->query( "SET datestyle = 'ISO, YMD'", __METHOD__ );
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$this->query( "SET timezone = 'GMT'", __METHOD__ );
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$this->query( "SET standard_conforming_strings = on", __METHOD__ );
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global $wgDBmwschema;
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if ( $this->schemaExists( $wgDBmwschema ) ) {
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$safeschema = $this->addIdentifierQuotes( $wgDBmwschema );
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$this->doQuery( "SET search_path = $safeschema" );
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} else {
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$this->doQuery( "SET search_path = public" );
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}
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return $this->mConn;
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}
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/**
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* Postgres doesn't support selectDB in the same way MySQL does. So if the
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* DB name doesn't match the open connection, open a new one
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* @return
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*/
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function selectDB( $db ) {
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if ( $this->mDBname !== $db ) {
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return (bool)$this->open( $this->mServer, $this->mUser, $this->mPassword, $db );
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} else {
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return true;
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}
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}
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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 $s;
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}
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/**
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* Closes a database connection, if it is open
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* Returns success, true if already closed
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* @return bool
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*/
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function close() {
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$this->mOpened = false;
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if ( $this->mConn ) {
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return pg_close( $this->mConn );
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} else {
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return true;
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}
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}
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protected function doQuery( $sql ) {
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if ( function_exists( 'mb_convert_encoding' ) ) {
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$sql = mb_convert_encoding( $sql, 'UTF-8' );
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}
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$this->mLastResult = pg_query( $this->mConn, $sql );
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$this->mAffectedRows = null; // use pg_affected_rows(mLastResult)
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return $this->mLastResult;
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}
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function queryIgnore( $sql, $fname = 'DatabasePostgres::queryIgnore' ) {
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return $this->query( $sql, $fname, true );
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}
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function freeResult( $res ) {
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if ( $res instanceof ResultWrapper ) {
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$res = $res->result;
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}
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wfSuppressWarnings();
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$ok = pg_free_result( $res );
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wfRestoreWarnings();
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if ( !$ok ) {
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throw new DBUnexpectedError( $this, "Unable to free Postgres result\n" );
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}
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}
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function fetchObject( $res ) {
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if ( $res instanceof ResultWrapper ) {
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$res = $res->result;
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}
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wfSuppressWarnings();
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$row = pg_fetch_object( $res );
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wfRestoreWarnings();
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# @todo FIXME: HACK HACK HACK HACK debug
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# @todo hashar: not sure if the following test really trigger if the object
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# fetching failed.
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if( pg_last_error( $this->mConn ) ) {
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throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
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}
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return $row;
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}
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function fetchRow( $res ) {
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if ( $res instanceof ResultWrapper ) {
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$res = $res->result;
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}
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wfSuppressWarnings();
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$row = pg_fetch_array( $res );
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wfRestoreWarnings();
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if( pg_last_error( $this->mConn ) ) {
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throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
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}
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return $row;
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}
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function numRows( $res ) {
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if ( $res instanceof ResultWrapper ) {
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$res = $res->result;
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}
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wfSuppressWarnings();
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$n = pg_num_rows( $res );
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wfRestoreWarnings();
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if( pg_last_error( $this->mConn ) ) {
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throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
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}
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return $n;
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}
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function numFields( $res ) {
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if ( $res instanceof ResultWrapper ) {
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$res = $res->result;
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}
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return pg_num_fields( $res );
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}
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function fieldName( $res, $n ) {
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if ( $res instanceof ResultWrapper ) {
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$res = $res->result;
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}
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return pg_field_name( $res, $n );
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}
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/**
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* This must be called after nextSequenceVal
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* @return null
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*/
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function insertId() {
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return $this->mInsertId;
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}
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function dataSeek( $res, $row ) {
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if ( $res instanceof ResultWrapper ) {
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$res = $res->result;
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}
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return pg_result_seek( $res, $row );
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}
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function lastError() {
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if ( $this->mConn ) {
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return pg_last_error();
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} else {
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return 'No database connection';
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}
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}
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function lastErrno() {
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return pg_last_error() ? 1 : 0;
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}
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function affectedRows() {
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if ( !is_null( $this->mAffectedRows ) ) {
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// Forced result for simulated queries
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return $this->mAffectedRows;
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}
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if( empty( $this->mLastResult ) ) {
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return 0;
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}
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return pg_affected_rows( $this->mLastResult );
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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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* @return int
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*/
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function estimateRowCount( $table, $vars = '*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
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$options['EXPLAIN'] = true;
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$res = $this->select( $table, $vars, $conds, $fname, $options );
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$rows = -1;
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if ( $res ) {
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$row = $this->fetchRow( $res );
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$count = array();
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if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
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$rows = $count[1];
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}
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}
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return $rows;
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}
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/**
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* Returns information about an index
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* If errors are explicitly ignored, returns NULL on failure
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* @return bool|null
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*/
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function indexInfo( $table, $index, $fname = 'DatabasePostgres::indexInfo' ) {
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$sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
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$res = $this->query( $sql, $fname );
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if ( !$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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function indexUnique( $table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
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$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, $fname );
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if ( !$res ) {
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return null;
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}
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foreach ( $res as $row ) {
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return true;
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}
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return false;
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}
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/**
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* INSERT wrapper, inserts an array into a table
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*
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* $args may be a single associative array, or an array of these with numeric keys,
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* for multi-row insert (Postgres version 8.2 and above only).
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*
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* @param $table String: Name of the table to insert to.
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* @param $args Array: Items to insert into the table.
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* @param $fname String: Name of the function, for profiling
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* @param $options String or Array. Valid options: IGNORE
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*
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* @return bool Success of insert operation. IGNORE always returns true.
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*/
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function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
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if ( !count( $args ) ) {
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return true;
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}
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$table = $this->tableName( $table );
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if (! isset( $this->numeric_version ) ) {
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$this->getServerVersion();
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}
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if ( !is_array( $options ) ) {
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$options = array( $options );
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}
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if ( isset( $args[0] ) && is_array( $args[0] ) ) {
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$multi = true;
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$keys = array_keys( $args[0] );
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} else {
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$multi = false;
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$keys = array_keys( $args );
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}
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// If IGNORE is set, we use savepoints to emulate mysql's behavior
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$ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
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// If we are not in a transaction, we need to be for savepoint trickery
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$didbegin = 0;
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if ( $ignore ) {
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if ( !$this->mTrxLevel ) {
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$this->begin();
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$didbegin = 1;
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}
|
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$olde = error_reporting( 0 );
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// For future use, we may want to track the number of actual inserts
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// Right now, insert (all writes) simply return true/false
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$numrowsinserted = 0;
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}
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$sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
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|
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if ( $multi ) {
|
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if ( $this->numeric_version >= 8.2 && !$ignore ) {
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$first = true;
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foreach ( $args as $row ) {
|
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if ( $first ) {
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$first = false;
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} else {
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$sql .= ',';
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}
|
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$sql .= '(' . $this->makeList( $row ) . ')';
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}
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$res = (bool)$this->query( $sql, $fname, $ignore );
|
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} else {
|
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$res = true;
|
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$origsql = $sql;
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foreach ( $args as $row ) {
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$tempsql = $origsql;
|
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$tempsql .= '(' . $this->makeList( $row ) . ')';
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|
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if ( $ignore ) {
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pg_query( $this->mConn, "SAVEPOINT $ignore" );
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}
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$tempres = (bool)$this->query( $tempsql, $fname, $ignore );
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|
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if ( $ignore ) {
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$bar = pg_last_error();
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if ( $bar != false ) {
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pg_query( $this->mConn, "ROLLBACK TO $ignore" );
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} else {
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pg_query( $this->mConn, "RELEASE $ignore" );
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$numrowsinserted++;
|
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}
|
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}
|
|
|
|
// If any of them fail, we fail overall for this function call
|
|
// Note that this will be ignored if IGNORE is set
|
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if ( !$tempres ) {
|
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$res = false;
|
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}
|
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}
|
|
}
|
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} else {
|
|
// Not multi, just a lone insert
|
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if ( $ignore ) {
|
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pg_query($this->mConn, "SAVEPOINT $ignore");
|
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}
|
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|
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$sql .= '(' . $this->makeList( $args ) . ')';
|
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$res = (bool)$this->query( $sql, $fname, $ignore );
|
|
if ( $ignore ) {
|
|
$bar = pg_last_error();
|
|
if ( $bar != false ) {
|
|
pg_query( $this->mConn, "ROLLBACK TO $ignore" );
|
|
} else {
|
|
pg_query( $this->mConn, "RELEASE $ignore" );
|
|
$numrowsinserted++;
|
|
}
|
|
}
|
|
}
|
|
if ( $ignore ) {
|
|
$olde = error_reporting( $olde );
|
|
if ( $didbegin ) {
|
|
$this->commit();
|
|
}
|
|
|
|
// Set the affected row count for the whole operation
|
|
$this->mAffectedRows = $numrowsinserted;
|
|
|
|
// IGNORE always returns true
|
|
return true;
|
|
}
|
|
|
|
return $res;
|
|
}
|
|
|
|
/**
|
|
* INSERT SELECT wrapper
|
|
* $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
|
|
* Source items may be literals rather then field names, but strings should be quoted with Database::addQuotes()
|
|
* $conds may be "*" to copy the whole table
|
|
* srcTable may be an array of tables.
|
|
* @todo FIXME: Implement this a little better (seperate select/insert)?
|
|
* @return bool
|
|
*/
|
|
function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabasePostgres::insertSelect',
|
|
$insertOptions = array(), $selectOptions = array() )
|
|
{
|
|
$destTable = $this->tableName( $destTable );
|
|
|
|
// If IGNORE is set, we use savepoints to emulate mysql's behavior
|
|
$ignore = in_array( 'IGNORE', $insertOptions ) ? 'mw' : '';
|
|
|
|
if( is_array( $insertOptions ) ) {
|
|
$insertOptions = implode( ' ', $insertOptions ); // FIXME: This is unused
|
|
}
|
|
if( !is_array( $selectOptions ) ) {
|
|
$selectOptions = array( $selectOptions );
|
|
}
|
|
list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
|
|
if( is_array( $srcTable ) ) {
|
|
$srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
|
|
} else {
|
|
$srcTable = $this->tableName( $srcTable );
|
|
}
|
|
|
|
// If we are not in a transaction, we need to be for savepoint trickery
|
|
$didbegin = 0;
|
|
if ( $ignore ) {
|
|
if( !$this->mTrxLevel ) {
|
|
$this->begin();
|
|
$didbegin = 1;
|
|
}
|
|
$olde = error_reporting( 0 );
|
|
$numrowsinserted = 0;
|
|
pg_query( $this->mConn, "SAVEPOINT $ignore");
|
|
}
|
|
|
|
$sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
|
|
" SELECT $startOpts " . implode( ',', $varMap ) .
|
|
" FROM $srcTable $useIndex";
|
|
|
|
if ( $conds != '*' ) {
|
|
$sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
|
|
}
|
|
|
|
$sql .= " $tailOpts";
|
|
|
|
$res = (bool)$this->query( $sql, $fname, $ignore );
|
|
if( $ignore ) {
|
|
$bar = pg_last_error();
|
|
if( $bar != false ) {
|
|
pg_query( $this->mConn, "ROLLBACK TO $ignore" );
|
|
} else {
|
|
pg_query( $this->mConn, "RELEASE $ignore" );
|
|
$numrowsinserted++;
|
|
}
|
|
$olde = error_reporting( $olde );
|
|
if( $didbegin ) {
|
|
$this->commit();
|
|
}
|
|
|
|
// Set the affected row count for the whole operation
|
|
$this->mAffectedRows = $numrowsinserted;
|
|
|
|
// IGNORE always returns true
|
|
return true;
|
|
}
|
|
|
|
return $res;
|
|
}
|
|
|
|
function tableName( $name, $format = 'quoted' ) {
|
|
# Replace reserved words with better ones
|
|
switch( $name ) {
|
|
case 'user':
|
|
return 'mwuser';
|
|
case 'text':
|
|
return 'pagecontent';
|
|
default:
|
|
return parent::tableName( $name, $format );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return the next in a sequence, save the value for retrieval via insertId()
|
|
* @return null
|
|
*/
|
|
function nextSequenceValue( $seqName ) {
|
|
$safeseq = str_replace( "'", "''", $seqName );
|
|
$res = $this->query( "SELECT nextval('$safeseq')" );
|
|
$row = $this->fetchRow( $res );
|
|
$this->mInsertId = $row[0];
|
|
return $this->mInsertId;
|
|
}
|
|
|
|
/**
|
|
* Return the current value of a sequence. Assumes it has been nextval'ed in this session.
|
|
* @return
|
|
*/
|
|
function currentSequenceValue( $seqName ) {
|
|
$safeseq = str_replace( "'", "''", $seqName );
|
|
$res = $this->query( "SELECT currval('$safeseq')" );
|
|
$row = $this->fetchRow( $res );
|
|
$currval = $row[0];
|
|
return $currval;
|
|
}
|
|
|
|
# Returns the size of a text field, or -1 for "unlimited"
|
|
function textFieldSize( $table, $field ) {
|
|
$table = $this->tableName( $table );
|
|
$sql = "SELECT t.typname as ftype,a.atttypmod as size
|
|
FROM pg_class c, pg_attribute a, pg_type t
|
|
WHERE relname='$table' AND a.attrelid=c.oid AND
|
|
a.atttypid=t.oid and a.attname='$field'";
|
|
$res =$this->query( $sql );
|
|
$row = $this->fetchObject( $res );
|
|
if ( $row->ftype == 'varchar' ) {
|
|
$size = $row->size - 4;
|
|
} else {
|
|
$size = $row->size;
|
|
}
|
|
return $size;
|
|
}
|
|
|
|
function limitResult( $sql, $limit, $offset = false ) {
|
|
return "$sql LIMIT $limit " . ( is_numeric( $offset ) ? " OFFSET {$offset} " : '' );
|
|
}
|
|
|
|
function wasDeadlock() {
|
|
return $this->lastErrno() == '40P01';
|
|
}
|
|
|
|
function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabasePostgres::duplicateTableStructure' ) {
|
|
$newName = $this->addIdentifierQuotes( $newName );
|
|
$oldName = $this->addIdentifierQuotes( $oldName );
|
|
return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName (LIKE $oldName INCLUDING DEFAULTS)", $fname );
|
|
}
|
|
|
|
function listTables( $prefix = null, $fname = 'DatabasePostgres::listTables' ) {
|
|
global $wgDBmwschema;
|
|
$eschema = $this->addQuotes( $wgDBmwschema );
|
|
$result = $this->query( "SELECT tablename FROM pg_tables WHERE schemaname = $eschema", $fname );
|
|
|
|
$endArray = array();
|
|
|
|
foreach( $result as $table ) {
|
|
$vars = get_object_vars($table);
|
|
$table = array_pop( $vars );
|
|
if( !$prefix || strpos( $table, $prefix ) === 0 ) {
|
|
$endArray[] = $table;
|
|
}
|
|
}
|
|
|
|
return $endArray;
|
|
}
|
|
|
|
function timestamp( $ts = 0 ) {
|
|
return wfTimestamp( TS_POSTGRES, $ts );
|
|
}
|
|
|
|
/**
|
|
* Return aggregated value function call
|
|
*/
|
|
function aggregateValue( $valuedata, $valuename = 'value' ) {
|
|
return $valuedata;
|
|
}
|
|
|
|
/**
|
|
* @return string wikitext of a link to the server software's web site
|
|
*/
|
|
public static function getSoftwareLink() {
|
|
return '[http://www.postgresql.org/ PostgreSQL]';
|
|
}
|
|
|
|
/**
|
|
* @return string Version information from the database
|
|
*/
|
|
function getServerVersion() {
|
|
if ( !isset( $this->numeric_version ) ) {
|
|
$versionInfo = pg_version( $this->mConn );
|
|
if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
|
|
// Old client, abort install
|
|
$this->numeric_version = '7.3 or earlier';
|
|
} elseif ( isset( $versionInfo['server'] ) ) {
|
|
// Normal client
|
|
$this->numeric_version = $versionInfo['server'];
|
|
} else {
|
|
// Bug 16937: broken pgsql extension from PHP<5.3
|
|
$this->numeric_version = pg_parameter_status( $this->mConn, 'server_version' );
|
|
}
|
|
}
|
|
return $this->numeric_version;
|
|
}
|
|
|
|
/**
|
|
* Query whether a given relation exists (in the given schema, or the
|
|
* default mw one if not given)
|
|
* @return bool
|
|
*/
|
|
function relationExists( $table, $types, $schema = false ) {
|
|
global $wgDBmwschema;
|
|
if ( !is_array( $types ) ) {
|
|
$types = array( $types );
|
|
}
|
|
if ( !$schema ) {
|
|
$schema = $wgDBmwschema;
|
|
}
|
|
$table = $this->tableName( $table, 'raw' );
|
|
$etable = $this->addQuotes( $table );
|
|
$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 );
|
|
$count = $res ? $res->numRows() : 0;
|
|
return (bool)$count;
|
|
}
|
|
|
|
/**
|
|
* For backward compatibility, this function checks both tables and
|
|
* views.
|
|
* @return bool
|
|
*/
|
|
function tableExists( $table, $fname = __METHOD__, $schema = false ) {
|
|
return $this->relationExists( $table, array( 'r', 'v' ), $schema );
|
|
}
|
|
|
|
function sequenceExists( $sequence, $schema = false ) {
|
|
return $this->relationExists( $sequence, 'S', $schema );
|
|
}
|
|
|
|
function triggerExists( $table, $trigger ) {
|
|
global $wgDBmwschema;
|
|
|
|
$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;
|
|
$res = $this->query(
|
|
sprintf(
|
|
$q,
|
|
$this->addQuotes( $wgDBmwschema ),
|
|
$this->addQuotes( $table ),
|
|
$this->addQuotes( $trigger )
|
|
)
|
|
);
|
|
if ( !$res ) {
|
|
return null;
|
|
}
|
|
$rows = $res->numRows();
|
|
return $rows;
|
|
}
|
|
|
|
function ruleExists( $table, $rule ) {
|
|
global $wgDBmwschema;
|
|
$exists = $this->selectField( 'pg_rules', 'rulename',
|
|
array(
|
|
'rulename' => $rule,
|
|
'tablename' => $table,
|
|
'schemaname' => $wgDBmwschema
|
|
)
|
|
);
|
|
return $exists === $rule;
|
|
}
|
|
|
|
function constraintExists( $table, $constraint ) {
|
|
global $wgDBmwschema;
|
|
$SQL = sprintf( "SELECT 1 FROM information_schema.table_constraints ".
|
|
"WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
|
|
$this->addQuotes( $wgDBmwschema ),
|
|
$this->addQuotes( $table ),
|
|
$this->addQuotes( $constraint )
|
|
);
|
|
$res = $this->query( $SQL );
|
|
if ( !$res ) {
|
|
return null;
|
|
}
|
|
$rows = $res->numRows();
|
|
return $rows;
|
|
}
|
|
|
|
/**
|
|
* Query whether a given schema exists. Returns true if it does, false if it doesn't.
|
|
* @return bool
|
|
*/
|
|
function schemaExists( $schema ) {
|
|
$exists = $this->selectField( '"pg_catalog"."pg_namespace"', 1,
|
|
array( 'nspname' => $schema ), __METHOD__ );
|
|
return (bool)$exists;
|
|
}
|
|
|
|
/**
|
|
* Returns true if a given role (i.e. user) exists, false otherwise.
|
|
* @return bool
|
|
*/
|
|
function roleExists( $roleName ) {
|
|
$exists = $this->selectField( '"pg_catalog"."pg_roles"', 1,
|
|
array( 'rolname' => $roleName ), __METHOD__ );
|
|
return (bool)$exists;
|
|
}
|
|
|
|
function fieldInfo( $table, $field ) {
|
|
return PostgresField::fromText( $this, $table, $field );
|
|
}
|
|
|
|
/**
|
|
* pg_field_type() wrapper
|
|
* @return string
|
|
*/
|
|
function fieldType( $res, $index ) {
|
|
if ( $res instanceof ResultWrapper ) {
|
|
$res = $res->result;
|
|
}
|
|
return pg_field_type( $res, $index );
|
|
}
|
|
|
|
/* Not even sure why this is used in the main codebase... */
|
|
function limitResultForUpdate( $sql, $num ) {
|
|
return $sql;
|
|
}
|
|
|
|
/**
|
|
* @param $b
|
|
* @return Blob
|
|
*/
|
|
function encodeBlob( $b ) {
|
|
return new Blob( pg_escape_bytea( $this->mConn, $b ) );
|
|
}
|
|
|
|
function decodeBlob( $b ) {
|
|
if ( $b instanceof Blob ) {
|
|
$b = $b->fetch();
|
|
}
|
|
return pg_unescape_bytea( $b );
|
|
}
|
|
|
|
function strencode( $s ) { # Should not be called by us
|
|
return pg_escape_string( $this->mConn, $s );
|
|
}
|
|
|
|
/**
|
|
* @param $s null|bool|Blob
|
|
* @return int|string
|
|
*/
|
|
function addQuotes( $s ) {
|
|
if ( is_null( $s ) ) {
|
|
return 'NULL';
|
|
} elseif ( is_bool( $s ) ) {
|
|
return intval( $s );
|
|
} elseif ( $s instanceof Blob ) {
|
|
return "'" . $s->fetch( $s ) . "'";
|
|
}
|
|
return "'" . pg_escape_string( $this->mConn, $s ) . "'";
|
|
}
|
|
|
|
/**
|
|
* Postgres specific version of replaceVars.
|
|
* Calls the parent version in Database.php
|
|
*
|
|
* @private
|
|
*
|
|
* @param $ins String: SQL string, read from a stream (usually tables.sql)
|
|
*
|
|
* @return string SQL string
|
|
*/
|
|
protected function replaceVars( $ins ) {
|
|
$ins = parent::replaceVars( $ins );
|
|
|
|
if ( $this->numeric_version >= 8.3 ) {
|
|
// Thanks for not providing backwards-compatibility, 8.3
|
|
$ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
|
|
}
|
|
|
|
if ( $this->numeric_version <= 8.1 ) { // Our minimum version
|
|
$ins = str_replace( 'USING gin', 'USING gist', $ins );
|
|
}
|
|
|
|
return $ins;
|
|
}
|
|
|
|
/**
|
|
* Various select options
|
|
*
|
|
* @private
|
|
*
|
|
* @param $options Array: an associative array of options to be turned into
|
|
* an SQL query, valid keys are listed in the function.
|
|
* @return array
|
|
*/
|
|
function makeSelectOptions( $options ) {
|
|
$preLimitTail = $postLimitTail = '';
|
|
$startOpts = $useIndex = '';
|
|
|
|
$noKeyOptions = array();
|
|
foreach ( $options as $key => $option ) {
|
|
if ( is_numeric( $key ) ) {
|
|
$noKeyOptions[$option] = true;
|
|
}
|
|
}
|
|
|
|
if ( isset( $options['GROUP BY'] ) ) {
|
|
$gb = is_array( $options['GROUP BY'] )
|
|
? implode( ',', $options['GROUP BY'] )
|
|
: $options['GROUP BY'];
|
|
$preLimitTail .= " GROUP BY {$gb}";
|
|
}
|
|
|
|
if ( isset( $options['HAVING'] ) ) {
|
|
$preLimitTail .= " HAVING {$options['HAVING']}";
|
|
}
|
|
|
|
if ( isset( $options['ORDER BY'] ) ) {
|
|
$ob = is_array( $options['ORDER BY'] )
|
|
? implode( ',', $options['ORDER BY'] )
|
|
: $options['ORDER BY'];
|
|
$preLimitTail .= " ORDER BY {$ob}";
|
|
}
|
|
|
|
//if ( isset( $options['LIMIT'] ) ) {
|
|
// $tailOpts .= $this->limitResult( '', $options['LIMIT'],
|
|
// isset( $options['OFFSET'] ) ? $options['OFFSET']
|
|
// : false );
|
|
//}
|
|
|
|
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';
|
|
}
|
|
|
|
return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
|
|
}
|
|
|
|
function setFakeMaster( $enabled = true ) {}
|
|
|
|
function getDBname() {
|
|
return $this->mDBname;
|
|
}
|
|
|
|
function getServer() {
|
|
return $this->mServer;
|
|
}
|
|
|
|
function buildConcat( $stringList ) {
|
|
return implode( ' || ', $stringList );
|
|
}
|
|
|
|
public function getSearchEngine() {
|
|
return 'SearchPostgres';
|
|
}
|
|
|
|
public function streamStatementEnd( &$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 );
|
|
}
|
|
} // end DatabasePostgres class
|