+++ /dev/null
-<?php
-/**
- * This is the Postgres database abstraction layer.
- *
- * @file
- * @ingroup Database
- */
-
-class PostgresField implements Field {
- private $name, $tablename, $type, $nullable, $max_length, $deferred, $deferrable, $conname;
-
- static function fromText($db, $table, $field) {
- global $wgDBmwschema;
-
- $q = <<<SQL
-SELECT
- attnotnull, attlen, COALESCE(conname, '') AS conname,
- COALESCE(condeferred, 'f') AS deferred,
- COALESCE(condeferrable, 'f') AS deferrable,
- CASE WHEN typname = 'int2' THEN 'smallint'
- WHEN typname = 'int4' THEN 'integer'
- WHEN typname = 'int8' THEN 'bigint'
- WHEN typname = 'bpchar' THEN 'char'
- ELSE typname END AS typname
-FROM pg_class c
-JOIN pg_namespace n ON (n.oid = c.relnamespace)
-JOIN pg_attribute a ON (a.attrelid = c.oid)
-JOIN pg_type t ON (t.oid = a.atttypid)
-LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
-WHERE relkind = 'r'
-AND nspname=%s
-AND relname=%s
-AND attname=%s;
-SQL;
-
- $table = $db->tableName( $table );
- $res = $db->query(
- sprintf( $q,
- $db->addQuotes( $wgDBmwschema ),
- $db->addQuotes( $table ),
- $db->addQuotes( $field )
- )
- );
- $row = $db->fetchObject( $res );
- if ( !$row ) {
- return null;
- }
- $n = new PostgresField;
- $n->type = $row->typname;
- $n->nullable = ( $row->attnotnull == 'f' );
- $n->name = $field;
- $n->tablename = $table;
- $n->max_length = $row->attlen;
- $n->deferrable = ( $row->deferrable == 't' );
- $n->deferred = ( $row->deferred == 't' );
- $n->conname = $row->conname;
- return $n;
- }
-
- function name() {
- return $this->name;
- }
-
- function tableName() {
- return $this->tablename;
- }
-
- function type() {
- return $this->type;
- }
-
- function isNullable() {
- return $this->nullable;
- }
-
- function maxLength() {
- return $this->max_length;
- }
-
- function is_deferrable() {
- return $this->deferrable;
- }
-
- function is_deferred() {
- return $this->deferred;
- }
-
- function conname() {
- return $this->conname;
- }
-
-}
-
-/**
- * @ingroup Database
- */
-class DatabasePostgres extends DatabaseBase {
- var $mInsertId = null;
- var $mLastResult = null;
- var $numeric_version = null;
- var $mAffectedRows = null;
-
- function getType() {
- return 'postgres';
- }
-
- function cascadingDeletes() {
- return true;
- }
- function cleanupTriggers() {
- return true;
- }
- function strictIPs() {
- return true;
- }
- function realTimestamps() {
- return true;
- }
- function implicitGroupby() {
- return false;
- }
- function implicitOrderby() {
- return false;
- }
- function searchableIPs() {
- return true;
- }
- function functionalIndexes() {
- return true;
- }
-
- function hasConstraint( $name ) {
- global $wgDBmwschema;
- $SQL = "SELECT 1 FROM pg_catalog.pg_constraint c, pg_catalog.pg_namespace n WHERE c.connamespace = n.oid AND conname = '" .
- pg_escape_string( $this->mConn, $name ) . "' AND n.nspname = '" . pg_escape_string( $this->mConn, $wgDBmwschema ) ."'";
- $res = $this->doQuery( $SQL );
- return $this->numRows( $res );
- }
-
- static function newFromParams( $server, $user, $password, $dbName, $flags = 0 ) {
- return new DatabasePostgres( $server, $user, $password, $dbName, $flags );
- }
-
- /**
- * Usually aborts on failure
- */
- function open( $server, $user, $password, $dbName ) {
- # Test for Postgres support, to avoid suppressed fatal error
- if ( !function_exists( 'pg_connect' ) ) {
- 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" );
- }
-
- global $wgDBport;
-
- if ( !strlen( $user ) ) { # e.g. the class is being loaded
- return;
- }
- $this->close();
- $this->mServer = $server;
- $this->mPort = $port = $wgDBport;
- $this->mUser = $user;
- $this->mPassword = $password;
- $this->mDBname = $dbName;
-
- $connectVars = array(
- 'dbname' => $dbName,
- 'user' => $user,
- 'password' => $password
- );
- if ( $server != false && $server != '' ) {
- $connectVars['host'] = $server;
- }
- if ( $port != false && $port != '' ) {
- $connectVars['port'] = $port;
- }
- $connectString = $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW );
-
- $this->installErrorHandler();
- $this->mConn = pg_connect( $connectString );
- $phpError = $this->restoreErrorHandler();
-
- if ( !$this->mConn ) {
- wfDebug( "DB connection error\n" );
- wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
- wfDebug( $this->lastError() . "\n" );
- throw new DBConnectionError( $this, str_replace( "\n", ' ', $phpError ) );
- }
-
- $this->mOpened = true;
-
- global $wgCommandLineMode;
- # If called from the command-line (e.g. importDump), only show errors
- if ( $wgCommandLineMode ) {
- $this->doQuery( "SET client_min_messages = 'ERROR'" );
- }
-
- $this->doQuery( "SET client_encoding='UTF8'" );
-
- global $wgDBmwschema, $wgDBts2schema;
- if ( isset( $wgDBmwschema ) && isset( $wgDBts2schema )
- && $wgDBmwschema !== 'mediawiki'
- && preg_match( '/^\w+$/', $wgDBmwschema )
- && preg_match( '/^\w+$/', $wgDBts2schema )
- ) {
- $safeschema = $this->addIdentifierQuotes( $wgDBmwschema );
- $this->doQuery( "SET search_path = $safeschema, $wgDBts2schema, public" );
- }
-
- return $this->mConn;
- }
-
- function makeConnectionString( $vars ) {
- $s = '';
- foreach ( $vars as $name => $value ) {
- $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
- }
- return $s;
- }
-
- /**
- * Closes a database connection, if it is open
- * Returns success, true if already closed
- */
- function close() {
- $this->mOpened = false;
- if ( $this->mConn ) {
- return pg_close( $this->mConn );
- } else {
- return true;
- }
- }
-
- function doQuery( $sql ) {
- if ( function_exists( 'mb_convert_encoding' ) ) {
- $sql = mb_convert_encoding( $sql, 'UTF-8' );
- }
- $this->mLastResult = pg_query( $this->mConn, $sql );
- $this->mAffectedRows = null; // use pg_affected_rows(mLastResult)
- return $this->mLastResult;
- }
-
- function queryIgnore( $sql, $fname = 'DatabasePostgres::queryIgnore' ) {
- return $this->query( $sql, $fname, true );
- }
-
- function freeResult( $res ) {
- if ( $res instanceof ResultWrapper ) {
- $res = $res->result;
- }
- if ( !@pg_free_result( $res ) ) {
- throw new DBUnexpectedError( $this, "Unable to free Postgres result\n" );
- }
- }
-
- function fetchObject( $res ) {
- if ( $res instanceof ResultWrapper ) {
- $res = $res->result;
- }
- @$row = pg_fetch_object( $res );
- # FIXME: HACK HACK HACK HACK debug
-
- # TODO:
- # hashar : not sure if the following test really trigger if the object
- # fetching failed.
- if( pg_last_error( $this->mConn ) ) {
- throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
- }
- return $row;
- }
-
- function fetchRow( $res ) {
- if ( $res instanceof ResultWrapper ) {
- $res = $res->result;
- }
- @$row = pg_fetch_array( $res );
- if( pg_last_error( $this->mConn ) ) {
- throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
- }
- return $row;
- }
-
- function numRows( $res ) {
- if ( $res instanceof ResultWrapper ) {
- $res = $res->result;
- }
- @$n = pg_num_rows( $res );
- if( pg_last_error( $this->mConn ) ) {
- throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
- }
- return $n;
- }
-
- function numFields( $res ) {
- if ( $res instanceof ResultWrapper ) {
- $res = $res->result;
- }
- return pg_num_fields( $res );
- }
-
- function fieldName( $res, $n ) {
- if ( $res instanceof ResultWrapper ) {
- $res = $res->result;
- }
- return pg_field_name( $res, $n );
- }
-
- /**
- * This must be called after nextSequenceVal
- */
- function insertId() {
- return $this->mInsertId;
- }
-
- function dataSeek( $res, $row ) {
- if ( $res instanceof ResultWrapper ) {
- $res = $res->result;
- }
- return pg_result_seek( $res, $row );
- }
-
- function lastError() {
- if ( $this->mConn ) {
- return pg_last_error();
- } else {
- return 'No database connection';
- }
- }
- function lastErrno() {
- return pg_last_error() ? 1 : 0;
- }
-
- function affectedRows() {
- if ( !is_null( $this->mAffectedRows ) ) {
- // Forced result for simulated queries
- return $this->mAffectedRows;
- }
- if( empty( $this->mLastResult ) ) {
- return 0;
- }
- return pg_affected_rows( $this->mLastResult );
- }
-
- /**
- * Estimate rows in dataset
- * Returns estimated count, based on EXPLAIN output
- * This is not necessarily an accurate estimate, so use sparingly
- * Returns -1 if count cannot be found
- * Takes same arguments as Database::select()
- */
- function estimateRowCount( $table, $vars = '*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
- $options['EXPLAIN'] = true;
- $res = $this->select( $table, $vars, $conds, $fname, $options );
- $rows = -1;
- if ( $res ) {
- $row = $this->fetchRow( $res );
- $count = array();
- if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
- $rows = $count[1];
- }
- }
- return $rows;
- }
-
- /**
- * Returns information about an index
- * If errors are explicitly ignored, returns NULL on failure
- */
- function indexInfo( $table, $index, $fname = 'DatabasePostgres::indexInfo' ) {
- $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
- $res = $this->query( $sql, $fname );
- if ( !$res ) {
- return null;
- }
- foreach ( $res as $row ) {
- if ( $row->indexname == $this->indexName( $index ) ) {
- return $row;
- }
- }
- return false;
- }
-
- function indexUnique( $table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
- $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
- " AND indexdef LIKE 'CREATE UNIQUE%(" .
- $this->strencode( $this->indexName( $index ) ) .
- ")'";
- $res = $this->query( $sql, $fname );
- if ( !$res ) {
- return null;
- }
- foreach ( $res as $row ) {
- return true;
- }
- return false;
- }
-
- /**
- * INSERT wrapper, inserts an array into a table
- *
- * $args may be a single associative array, or an array of these with numeric keys,
- * for multi-row insert (Postgres version 8.2 and above only).
- *
- * @param $table String: Name of the table to insert to.
- * @param $args Array: Items to insert into the table.
- * @param $fname String: Name of the function, for profiling
- * @param $options String or Array. Valid options: IGNORE
- *
- * @return bool Success of insert operation. IGNORE always returns true.
- */
- function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
- if ( !count( $args ) ) {
- return true;
- }
-
- $table = $this->tableName( $table );
- if (! isset( $this->numeric_version ) ) {
- $this->getServerVersion();
- }
-
- if ( !is_array( $options ) ) {
- $options = array( $options );
- }
-
- if ( isset( $args[0] ) && is_array( $args[0] ) ) {
- $multi = true;
- $keys = array_keys( $args[0] );
- } else {
- $multi = false;
- $keys = array_keys( $args );
- }
-
- // If IGNORE is set, we use savepoints to emulate mysql's behavior
- $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
-
- // 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 );
- // For future use, we may want to track the number of actual inserts
- // Right now, insert (all writes) simply return true/false
- $numrowsinserted = 0;
- }
-
- $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
-
- if ( $multi ) {
- if ( $this->numeric_version >= 8.2 && !$ignore ) {
- $first = true;
- foreach ( $args as $row ) {
- if ( $first ) {
- $first = false;
- } else {
- $sql .= ',';
- }
- $sql .= '(' . $this->makeList( $row ) . ')';
- }
- $res = (bool)$this->query( $sql, $fname, $ignore );
- } else {
- $res = true;
- $origsql = $sql;
- foreach ( $args as $row ) {
- $tempsql = $origsql;
- $tempsql .= '(' . $this->makeList( $row ) . ')';
-
- if ( $ignore ) {
- pg_query( $this->mConn, "SAVEPOINT $ignore" );
- }
-
- $tempres = (bool)$this->query( $tempsql, $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" );
- $numrowsinserted++;
- }
- }
-
- // If any of them fail, we fail overall for this function call
- // Note that this will be ignored if IGNORE is set
- if ( !$tempres ) {
- $res = false;
- }
- }
- }
- } else {
- // Not multi, just a lone insert
- if ( $ignore ) {
- pg_query($this->mConn, "SAVEPOINT $ignore");
- }
-
- $sql .= '(' . $this->makeList( $args ) . ')';
- $res = (bool)$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)?
- */
- 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 );
- }
- 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 ) {
- # Replace reserved words with better ones
- switch( $name ) {
- case 'user':
- return 'mwuser';
- case 'text':
- return 'pagecontent';
- default:
- return $name;
- }
- }
-
- /**
- * Return the next in a sequence, save the value for retrieval via insertId()
- */
- 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.
- */
- function currentSequenceValue( $seqName ) {
- $safeseq = str_replace( "'", "''", $seqName );
- $res = $this->query( "SELECT currval('$safeseq')" );
- $row = $this->fetchRow( $res );
- $currval = $row[0];
- return $currval;
- }
-
- /**
- * REPLACE query wrapper
- * Postgres simulates this with a DELETE followed by INSERT
- * $row is the row to insert, an associative array
- * $uniqueIndexes is an array of indexes. Each element may be either a
- * field name or an array of field names
- *
- * It may be more efficient to leave off unique indexes which are unlikely to collide.
- * However if you do this, you run the risk of encountering errors which wouldn't have
- * occurred in MySQL
- */
- function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabasePostgres::replace' ) {
- $table = $this->tableName( $table );
-
- if ( count( $rows ) == 0 ) {
- return;
- }
-
- # Single row case
- if ( !is_array( reset( $rows ) ) ) {
- $rows = array( $rows );
- }
-
- foreach( $rows as $row ) {
- # Delete rows which collide
- if ( $uniqueIndexes ) {
- $sql = "DELETE FROM $table WHERE ";
- $first = true;
- foreach ( $uniqueIndexes as $index ) {
- if ( $first ) {
- $first = false;
- $sql .= '(';
- } else {
- $sql .= ') OR (';
- }
- if ( is_array( $index ) ) {
- $first2 = true;
- foreach ( $index as $col ) {
- if ( $first2 ) {
- $first2 = false;
- } else {
- $sql .= ' AND ';
- }
- $sql .= $col.'=' . $this->addQuotes( $row[$col] );
- }
- } else {
- $sql .= $index.'=' . $this->addQuotes( $row[$index] );
- }
- }
- $sql .= ')';
- $this->query( $sql, $fname );
- }
-
- # Now insert the row
- $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
- $this->makeList( $row, LIST_COMMA ) . ')';
- $this->query( $sql, $fname );
- }
- }
-
- # DELETE where the condition is a join
- function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabasePostgres::deleteJoin' ) {
- if ( !$conds ) {
- throw new DBUnexpectedError( $this, 'DatabasePostgres::deleteJoin() called with empty $conds' );
- }
-
- $delTable = $this->tableName( $delTable );
- $joinTable = $this->tableName( $joinTable );
- $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
- if ( $conds != '*' ) {
- $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
- }
- $sql .= ')';
-
- $this->query( $sql, $fname );
- }
-
- # 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' ) {
- return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName (LIKE $oldName INCLUDING DEFAULTS)", $fname );
- }
-
- 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)
- */
- function relationExists( $table, $types, $schema = false ) {
- global $wgDBmwschema;
- if ( !is_array( $types ) ) {
- $types = array( $types );
- }
- if ( !$schema ) {
- $schema = $wgDBmwschema;
- }
- $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.
- */
- function tableExists( $table, $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.
- */
- 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.
- */
- 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
- */
- 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;
- }
-
- 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 );
- }
-
- 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'] ) ) {
- $preLimitTail .= ' GROUP BY ' . $options['GROUP BY'];
- }
- if ( isset( $options['HAVING'] ) ) {
- $preLimitTail .= " HAVING {$options['HAVING']}";
- }
- if ( isset( $options['ORDER BY'] ) ) {
- $preLimitTail .= ' ORDER BY ' . $options['ORDER BY'];
- }
-
- //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';
- }
-} // end DatabasePostgres class
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