1 files changed, 34 insertions, 899 deletions

diff --git a/includes/db/DatabaseMysql.php b/includes/db/DatabaseMysql.php
index 27aae188..956bb694 100644
--- a/includes/db/DatabaseMysql.php
+++ b/includes/db/DatabaseMysql.php
@@ -22,27 +22,19 @@
  */
 
 /**
- * Database abstraction object for mySQL
- * Inherit all methods and properties of Database::Database()
+ * Database abstraction object for PHP extension mysql.
  *
  * @ingroup Database
  * @see Database
  */
-class DatabaseMysql extends DatabaseBase {
-
-	/**
-	 * @return string
-	 */
-	function getType() {
-		return 'mysql';
-	}
+class DatabaseMysql extends DatabaseMysqlBase {
 
 	/**
 	 * @param $sql string
 	 * @return resource
 	 */
 	protected function doQuery( $sql ) {
-		if( $this->bufferResults() ) {
+		if ( $this->bufferResults() ) {
 			$ret = mysql_query( $sql, $this->mConn );
 		} else {
 			$ret = mysql_unbuffered_query( $sql, $this->mConn );
@@ -50,39 +42,13 @@ class DatabaseMysql extends DatabaseBase {
 		return $ret;
 	}
 
-	/**
-	 * @param $server string
-	 * @param $user string
-	 * @param $password string
-	 * @param $dbName string
-	 * @return bool
-	 * @throws DBConnectionError
-	 */
-	function open( $server, $user, $password, $dbName ) {
-		global $wgAllDBsAreLocalhost, $wgDBmysql5, $wgSQLMode;
-		wfProfileIn( __METHOD__ );
-
-		# Load mysql.so if we don't have it
-		wfDl( 'mysql' );
-
+	protected function mysqlConnect( $realServer ) {
 		# Fail now
 		# Otherwise we get a suppressed fatal error, which is very hard to track down
-		if ( !function_exists( 'mysql_connect' ) ) {
+		if ( !extension_loaded( 'mysql' ) ) {
 			throw new DBConnectionError( $this, "MySQL functions missing, have you compiled PHP with the --with-mysql option?\n" );
 		}
 
-		# Debugging hack -- fake cluster
-		if ( $wgAllDBsAreLocalhost ) {
-			$realServer = 'localhost';
-		} else {
-			$realServer = $server;
-		}
-		$this->close();
-		$this->mServer = $server;
-		$this->mUser = $user;
-		$this->mPassword = $password;
-		$this->mDBname = $dbName;
-
 		$connFlags = 0;
 		if ( $this->mFlags & DBO_SSL ) {
 			$connFlags |= MYSQL_CLIENT_SSL;
@@ -91,81 +57,27 @@ class DatabaseMysql extends DatabaseBase {
 			$connFlags |= MYSQL_CLIENT_COMPRESS;
 		}
 
-		wfProfileIn( "dbconnect-$server" );
-
-		# The kernel's default SYN retransmission period is far too slow for us,
-		# so we use a short timeout plus a manual retry. Retrying means that a small
-		# but finite rate of SYN packet loss won't cause user-visible errors.
-		$this->mConn = false;
 		if ( ini_get( 'mysql.connect_timeout' ) <= 3 ) {
 			$numAttempts = 2;
 		} else {
 			$numAttempts = 1;
 		}
-		$this->installErrorHandler();
-		for ( $i = 0; $i < $numAttempts && !$this->mConn; $i++ ) {
+
+		$conn = false;
+
+		for ( $i = 0; $i < $numAttempts && !$conn; $i++ ) {
 			if ( $i > 1 ) {
 				usleep( 1000 );
 			}
 			if ( $this->mFlags & DBO_PERSISTENT ) {
-				$this->mConn = mysql_pconnect( $realServer, $user, $password, $connFlags );
+				$conn = mysql_pconnect( $realServer, $this->mUser, $this->mPassword, $connFlags );
 			} else {
 				# Create a new connection...
-				$this->mConn = mysql_connect( $realServer, $user, $password, true, $connFlags );
-			}
-			#if ( $this->mConn === false ) {
-				#$iplus = $i + 1;
-				#wfLogDBError("Connect loop error $iplus of $max ($server): " . mysql_errno() . " - " . mysql_error()."\n");
-			#}
-		}
-		$error = $this->restoreErrorHandler();
-
-		wfProfileOut( "dbconnect-$server" );
-
-		# Always log connection errors
-		if ( !$this->mConn ) {
-			if ( !$error ) {
-				$error = $this->lastError();
-			}
-			wfLogDBError( "Error connecting to {$this->mServer}: $error\n" );
-			wfDebug( "DB connection error\n" .
-				"Server: $server, User: $user, Password: " .
-				substr( $password, 0, 3 ) . "..., error: " . $error . "\n" );
-
-			wfProfileOut( __METHOD__ );
-			return $this->reportConnectionError( $error );
-		}
-
-		if ( $dbName != '' ) {
-			wfSuppressWarnings();
-			$success = mysql_select_db( $dbName, $this->mConn );
-			wfRestoreWarnings();
-			if ( !$success ) {
-				wfLogDBError( "Error selecting database $dbName on server {$this->mServer}\n" );
-				wfDebug( "Error selecting database $dbName on server {$this->mServer} " .
-					"from client host " . wfHostname() . "\n" );
-
-				wfProfileOut( __METHOD__ );
-				return $this->reportConnectionError( "Error selecting database $dbName" );
+				$conn = mysql_connect( $realServer, $this->mUser, $this->mPassword, true, $connFlags );
 			}
 		}
 
-		// Tell the server we're communicating with it in UTF-8.
-		// This may engage various charset conversions.
-		if( $wgDBmysql5 ) {
-			$this->query( 'SET NAMES utf8', __METHOD__ );
-		} else {
-			$this->query( 'SET NAMES binary', __METHOD__ );
-		}
-		// Set SQL mode, default is turning them all off, can be overridden or skipped with null
-		if ( is_string( $wgSQLMode ) ) {
-			$mode = $this->addQuotes( $wgSQLMode );
-			$this->query( "SET sql_mode = $mode", __METHOD__ );
-		}
-
-		$this->mOpened = true;
-		wfProfileOut( __METHOD__ );
-		return true;
+		return $conn;
 	}
 
 	/**
@@ -176,113 +88,6 @@ class DatabaseMysql extends DatabaseBase {
 	}
 
 	/**
-	 * @param $res ResultWrapper
-	 * @throws DBUnexpectedError
-	 */
-	function freeResult( $res ) {
-		if ( $res instanceof ResultWrapper ) {
-			$res = $res->result;
-		}
-		wfSuppressWarnings();
-		$ok = mysql_free_result( $res );
-		wfRestoreWarnings();
-		if ( !$ok ) {
-			throw new DBUnexpectedError( $this, "Unable to free MySQL result" );
-		}
-	}
-
-	/**
-	 * @param $res ResultWrapper
-	 * @return object|bool
-	 * @throws DBUnexpectedError
-	 */
-	function fetchObject( $res ) {
-		if ( $res instanceof ResultWrapper ) {
-			$res = $res->result;
-		}
-		wfSuppressWarnings();
-		$row = mysql_fetch_object( $res );
-		wfRestoreWarnings();
-
-		$errno = $this->lastErrno();
-		// Unfortunately, mysql_fetch_object does not reset the last errno.
-		// Only check for CR_SERVER_LOST and CR_UNKNOWN_ERROR, as
-		// these are the only errors mysql_fetch_object can cause.
-		// See http://dev.mysql.com/doc/refman/5.0/en/mysql-fetch-row.html.
-		if( $errno == 2000 || $errno == 2013 ) {
-			throw new DBUnexpectedError( $this, 'Error in fetchObject(): ' . htmlspecialchars( $this->lastError() ) );
-		}
-		return $row;
-	}
-
-	/**
-	 * @param $res ResultWrapper
-	 * @return array|bool
-	 * @throws DBUnexpectedError
-	 */
-	function fetchRow( $res ) {
-		if ( $res instanceof ResultWrapper ) {
-			$res = $res->result;
-		}
-		wfSuppressWarnings();
-		$row = mysql_fetch_array( $res );
-		wfRestoreWarnings();
-
-		$errno = $this->lastErrno();
-		// Unfortunately, mysql_fetch_array does not reset the last errno.
-		// Only check for CR_SERVER_LOST and CR_UNKNOWN_ERROR, as
-		// these are the only errors mysql_fetch_object can cause.
-		// See http://dev.mysql.com/doc/refman/5.0/en/mysql-fetch-row.html.
-		if( $errno == 2000 || $errno == 2013 ) {
-			throw new DBUnexpectedError( $this, 'Error in fetchRow(): ' . htmlspecialchars( $this->lastError() ) );
-		}
-		return $row;
-	}
-
-	/**
-	 * @throws DBUnexpectedError
-	 * @param $res ResultWrapper
-	 * @return int
-	 */
-	function numRows( $res ) {
-		if ( $res instanceof ResultWrapper ) {
-			$res = $res->result;
-		}
-		wfSuppressWarnings();
-		$n = mysql_num_rows( $res );
-		wfRestoreWarnings();
-		// Unfortunately, mysql_num_rows does not reset the last errno.
-		// We are not checking for any errors here, since
-		// these are no errors mysql_num_rows can cause.
-		// See http://dev.mysql.com/doc/refman/5.0/en/mysql-fetch-row.html.
-		// See https://bugzilla.wikimedia.org/42430
-		return $n;
-	}
-
-	/**
-	 * @param $res ResultWrapper
-	 * @return int
-	 */
-	function numFields( $res ) {
-		if ( $res instanceof ResultWrapper ) {
-			$res = $res->result;
-		}
-		return mysql_num_fields( $res );
-	}
-
-	/**
-	 * @param $res ResultWrapper
-	 * @param $n string
-	 * @return string
-	 */
-	function fieldName( $res, $n ) {
-		if ( $res instanceof ResultWrapper ) {
-			$res = $res->result;
-		}
-		return mysql_field_name( $res, $n );
-	}
-
-	/**
 	 * @return int
 	 */
 	function insertId() {
@@ -290,18 +95,6 @@ class DatabaseMysql extends DatabaseBase {
 	}
 
 	/**
-	 * @param $res ResultWrapper
-	 * @param $row
-	 * @return bool
-	 */
-	function dataSeek( $res, $row ) {
-		if ( $res instanceof ResultWrapper ) {
-			$res = $res->result;
-		}
-		return mysql_data_seek( $res, $row );
-	}
-
-	/**
 	 * @return int
 	 */
 	function lastErrno() {
@@ -313,27 +106,6 @@ class DatabaseMysql extends DatabaseBase {
 	}
 
 	/**
-	 * @return string
-	 */
-	function lastError() {
-		if ( $this->mConn ) {
-			# Even if it's non-zero, it can still be invalid
-			wfSuppressWarnings();
-			$error = mysql_error( $this->mConn );
-			if ( !$error ) {
-				$error = mysql_error();
-			}
-			wfRestoreWarnings();
-		} else {
-			$error = mysql_error();
-		}
-		if( $error ) {
-			$error .= ' (' . $this->mServer . ')';
-		}
-		return $error;
-	}
-
-	/**
 	 * @return int
 	 */
 	function affectedRows() {
@@ -341,100 +113,6 @@ class DatabaseMysql extends DatabaseBase {
 	}
 
 	/**
-	 * @param $table string
-	 * @param $uniqueIndexes
-	 * @param $rows array
-	 * @param $fname string
-	 * @return ResultWrapper
-	 */
-	function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseMysql::replace' ) {
-		return $this->nativeReplace( $table, $rows, $fname );
-	}
-
-	/**
-	 * Estimate rows in dataset
-	 * Returns estimated count, based on EXPLAIN output
-	 * Takes same arguments as Database::select()
-	 *
-	 * @param $table string|array
-	 * @param $vars string|array
-	 * @param $conds string|array
-	 * @param $fname string
-	 * @param $options string|array
-	 * @return int
-	 */
-	public function estimateRowCount( $table, $vars = '*', $conds = '', $fname = 'DatabaseMysql::estimateRowCount', $options = array() ) {
-		$options['EXPLAIN'] = true;
-		$res = $this->select( $table, $vars, $conds, $fname, $options );
-		if ( $res === false ) {
-			return false;
-		}
-		if ( !$this->numRows( $res ) ) {
-			return 0;
-		}
-
-		$rows = 1;
-		foreach ( $res as $plan ) {
-			$rows *= $plan->rows > 0 ? $plan->rows : 1; // avoid resetting to zero
-		}
-		return $rows;
-	}
-
-	/**
-	 * @param $table string
-	 * @param $field string
-	 * @return bool|MySQLField
-	 */
-	function fieldInfo( $table, $field ) {
-		$table = $this->tableName( $table );
-		$res = $this->query( "SELECT * FROM $table LIMIT 1", __METHOD__, true );
-		if ( !$res ) {
-			return false;
-		}
-		$n = mysql_num_fields( $res->result );
-		for( $i = 0; $i < $n; $i++ ) {
-			$meta = mysql_fetch_field( $res->result, $i );
-			if( $field == $meta->name ) {
-				return new MySQLField( $meta );
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * Get information about an index into an object
-	 * Returns false if the index does not exist
-	 *
-	 * @param $table string
-	 * @param $index string
-	 * @param $fname string
-	 * @return bool|array|null False or null on failure
-	 */
-	function indexInfo( $table, $index, $fname = 'DatabaseMysql::indexInfo' ) {
-		# SHOW INDEX works in MySQL 3.23.58, but SHOW INDEXES does not.
-		# SHOW INDEX should work for 3.x and up:
-		# http://dev.mysql.com/doc/mysql/en/SHOW_INDEX.html
-		$table = $this->tableName( $table );
-		$index = $this->indexName( $index );
-
-		$sql = 'SHOW INDEX FROM ' . $table;
-		$res = $this->query( $sql, $fname );
-
-		if ( !$res ) {
-			return null;
-		}
-
-		$result = array();
-
-		foreach ( $res as $row ) {
-			if ( $row->Key_name == $index ) {
-				$result[] = $row;
-			}
-		}
-		return empty( $result ) ? false : $result;
-	}
-
-	/**
 	 * @param $db
 	 * @return bool
 	 */
@@ -444,596 +122,53 @@ class DatabaseMysql extends DatabaseBase {
 	}
 
 	/**
-	 * @param $s string
-	 *
-	 * @return string
-	 */
-	function strencode( $s ) {
-		$sQuoted = mysql_real_escape_string( $s, $this->mConn );
-
-		if( $sQuoted === false ) {
-			$this->ping();
-			$sQuoted = mysql_real_escape_string( $s, $this->mConn );
-		}
-		return $sQuoted;
-	}
-
-	/**
-	 * MySQL uses `backticks` for identifier quoting instead of the sql standard "double quotes".
-	 *
-	 * @param $s string
-	 *
-	 * @return string
-	 */
-	public function addIdentifierQuotes( $s ) {
-		return "`" . $this->strencode( $s ) . "`";
-	}
-
-	/**
-	 * @param $name string
-	 * @return bool
-	 */
-	public function isQuotedIdentifier( $name ) {
-		return strlen( $name ) && $name[0] == '`' && substr( $name, -1, 1 ) == '`';
-	}
-
-	/**
-	 * @return bool
-	 */
-	function ping() {
-		$ping = mysql_ping( $this->mConn );
-		if ( $ping ) {
-			return true;
-		}
-
-		mysql_close( $this->mConn );
-		$this->mOpened = false;
-		$this->mConn = false;
-		$this->open( $this->mServer, $this->mUser, $this->mPassword, $this->mDBname );
-		return true;
-	}
-
-	/**
-	 * Returns slave lag.
-	 *
-	 * This will do a SHOW SLAVE STATUS
-	 *
-	 * @return int
-	 */
-	function getLag() {
-		if ( !is_null( $this->mFakeSlaveLag ) ) {
-			wfDebug( "getLag: fake slave lagged {$this->mFakeSlaveLag} seconds\n" );
-			return $this->mFakeSlaveLag;
-		}
-
-		return $this->getLagFromSlaveStatus();
-	}
-
-	/**
-	 * @return bool|int
-	 */
-	function getLagFromSlaveStatus() {
-		$res = $this->query( 'SHOW SLAVE STATUS', __METHOD__ );
-		if ( !$res ) {
-			return false;
-		}
-		$row = $res->fetchObject();
-		if ( !$row ) {
-			return false;
-		}
-		if ( strval( $row->Seconds_Behind_Master ) === '' ) {
-			return false;
-		} else {
-			return intval( $row->Seconds_Behind_Master );
-		}
-	}
-
-	/**
-	 * @deprecated in 1.19, use getLagFromSlaveStatus
-	 *
-	 * @return bool|int
-	 */
-	function getLagFromProcesslist() {
-		wfDeprecated( __METHOD__, '1.19' );
-		$res = $this->query( 'SHOW PROCESSLIST', __METHOD__ );
-		if( !$res ) {
-			return false;
-		}
-		# Find slave SQL thread
-		foreach( $res as $row ) {
-			/* This should work for most situations - when default db
-			 * for thread is not specified, it had no events executed,
-			 * and therefore it doesn't know yet how lagged it is.
-			 *
-			 * Relay log I/O thread does not select databases.
-			 */
-			if ( $row->User == 'system user' &&
-				$row->State != 'Waiting for master to send event' &&
-				$row->State != 'Connecting to master' &&
-				$row->State != 'Queueing master event to the relay log' &&
-				$row->State != 'Waiting for master update' &&
-				$row->State != 'Requesting binlog dump' &&
-				$row->State != 'Waiting to reconnect after a failed master event read' &&
-				$row->State != 'Reconnecting after a failed master event read' &&
-				$row->State != 'Registering slave on master'
-				) {
-				# This is it, return the time (except -ve)
-				if ( $row->Time > 0x7fffffff ) {
-					return false;
-				} else {
-					return $row->Time;
-				}
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * Wait for the slave to catch up to a given master position.
-	 *
-	 * @param $pos DBMasterPos object
-	 * @param $timeout Integer: the maximum number of seconds to wait for synchronisation
-	 * @return bool|string
-	 */
-	function masterPosWait( DBMasterPos $pos, $timeout ) {
-		$fname = 'DatabaseBase::masterPosWait';
-		wfProfileIn( $fname );
-
-		# Commit any open transactions
-		if ( $this->mTrxLevel ) {
-			$this->commit( __METHOD__ );
-		}
-
-		if ( !is_null( $this->mFakeSlaveLag ) ) {
-			$status = parent::masterPosWait( $pos, $timeout );
-			wfProfileOut( $fname );
-			return $status;
-		}
-
-		# Call doQuery() directly, to avoid opening a transaction if DBO_TRX is set
-		$encFile = $this->addQuotes( $pos->file );
-		$encPos = intval( $pos->pos );
-		$sql = "SELECT MASTER_POS_WAIT($encFile, $encPos, $timeout)";
-		$res = $this->doQuery( $sql );
-
-		if ( $res && $row = $this->fetchRow( $res ) ) {
-			wfProfileOut( $fname );
-			return $row[0];
-		}
-		wfProfileOut( $fname );
-		return false;
-	}
-
-	/**
-	 * Get the position of the master from SHOW SLAVE STATUS
-	 *
-	 * @return MySQLMasterPos|bool
-	 */
-	function getSlavePos() {
-		if ( !is_null( $this->mFakeSlaveLag ) ) {
-			return parent::getSlavePos();
-		}
-
-		$res = $this->query( 'SHOW SLAVE STATUS', 'DatabaseBase::getSlavePos' );
-		$row = $this->fetchObject( $res );
-
-		if ( $row ) {
-			$pos = isset( $row->Exec_master_log_pos ) ? $row->Exec_master_log_pos : $row->Exec_Master_Log_Pos;
-			return new MySQLMasterPos( $row->Relay_Master_Log_File, $pos );
-		} else {
-			return false;
-		}
-	}
-
-	/**
-	 * Get the position of the master from SHOW MASTER STATUS
-	 *
-	 * @return MySQLMasterPos|bool
-	 */
-	function getMasterPos() {
-		if ( $this->mFakeMaster ) {
-			return parent::getMasterPos();
-		}
-
-		$res = $this->query( 'SHOW MASTER STATUS', 'DatabaseBase::getMasterPos' );
-		$row = $this->fetchObject( $res );
-
-		if ( $row ) {
-			return new MySQLMasterPos( $row->File, $row->Position );
-		} else {
-			return false;
-		}
-	}
-
-	/**
 	 * @return string
 	 */
 	function getServerVersion() {
 		return mysql_get_server_info( $this->mConn );
 	}
 
-	/**
-	 * @param $index
-	 * @return string
-	 */
-	function useIndexClause( $index ) {
-		return "FORCE INDEX (" . $this->indexName( $index ) . ")";
-	}
-
-	/**
-	 * @return string
-	 */
-	function lowPriorityOption() {
-		return 'LOW_PRIORITY';
+	protected function mysqlFreeResult( $res ) {
+		return mysql_free_result( $res );
 	}
 
-	/**
-	 * @return string
-	 */
-	public static function getSoftwareLink() {
-		return '[http://www.mysql.com/ MySQL]';
-	}
-
-	/**
-	 * @param $options array
-	 */
-	public function setSessionOptions( array $options ) {
-		if ( isset( $options['connTimeout'] ) ) {
-			$timeout = (int)$options['connTimeout'];
-			$this->query( "SET net_read_timeout=$timeout" );
-			$this->query( "SET net_write_timeout=$timeout" );
-		}
+	protected function mysqlFetchObject( $res ) {
+		return mysql_fetch_object( $res );
 	}
 
-	public function streamStatementEnd( &$sql, &$newLine ) {
-		if ( strtoupper( substr( $newLine, 0, 9 ) ) == 'DELIMITER' ) {
-			preg_match( '/^DELIMITER\s+(\S+)/', $newLine, $m );
-			$this->delimiter = $m[1];
-			$newLine = '';
-		}
-		return parent::streamStatementEnd( $sql, $newLine );
+	protected function mysqlFetchArray( $res ) {
+		return mysql_fetch_array( $res );
 	}
 
-	/**
-	 * Check to see if a named lock is available. This is non-blocking.
-	 *
-	 * @param string $lockName name of lock to poll
-	 * @param string $method name of method calling us
-	 * @return Boolean
-	 * @since 1.20
-	 */
-	public function lockIsFree( $lockName, $method ) {
-		$lockName = $this->addQuotes( $lockName );
-		$result = $this->query( "SELECT IS_FREE_LOCK($lockName) AS lockstatus", $method );
-		$row = $this->fetchObject( $result );
-		return ( $row->lockstatus == 1 );
+	protected function mysqlNumRows( $res ) {
+		return mysql_num_rows( $res );
 	}
 
-	/**
-	 * @param $lockName string
-	 * @param $method string
-	 * @param $timeout int
-	 * @return bool
-	 */
-	public function lock( $lockName, $method, $timeout = 5 ) {
-		$lockName = $this->addQuotes( $lockName );
-		$result = $this->query( "SELECT GET_LOCK($lockName, $timeout) AS lockstatus", $method );
-		$row = $this->fetchObject( $result );
-
-		if( $row->lockstatus == 1 ) {
-			return true;
-		} else {
-			wfDebug( __METHOD__ . " failed to acquire lock\n" );
-			return false;
-		}
-	}
-
-	/**
-	 * FROM MYSQL DOCS: http://dev.mysql.com/doc/refman/5.0/en/miscellaneous-functions.html#function_release-lock
-	 * @param $lockName string
-	 * @param $method string
-	 * @return bool
-	 */
-	public function unlock( $lockName, $method ) {
-		$lockName = $this->addQuotes( $lockName );
-		$result = $this->query( "SELECT RELEASE_LOCK($lockName) as lockstatus", $method );
-		$row = $this->fetchObject( $result );
-		return ( $row->lockstatus == 1 );
-	}
-
-	/**
-	 * @param $read array
-	 * @param $write array
-	 * @param $method string
-	 * @param $lowPriority bool
-	 * @return bool
-	 */
-	public function lockTables( $read, $write, $method, $lowPriority = true ) {
-		$items = array();
-
-		foreach( $write as $table ) {
-			$tbl = $this->tableName( $table ) .
-					( $lowPriority ? ' LOW_PRIORITY' : '' ) .
-					' WRITE';
-			$items[] = $tbl;
-		}
-		foreach( $read as $table ) {
-			$items[] = $this->tableName( $table ) . ' READ';
-		}
-		$sql = "LOCK TABLES " . implode( ',', $items );
-		$this->query( $sql, $method );
-		return true;
-	}
-
-	/**
-	 * @param $method string
-	 * @return bool
-	 */
-	public function unlockTables( $method ) {
-		$this->query( "UNLOCK TABLES", $method );
-		return true;
-	}
-
-	/**
-	 * Get search engine class. All subclasses of this
-	 * need to implement this if they wish to use searching.
-	 *
-	 * @return String
-	 */
-	public function getSearchEngine() {
-		return 'SearchMySQL';
-	}
-
-	/**
-	 * @param bool $value
-	 * @return mixed
-	 */
-	public function setBigSelects( $value = true ) {
-		if ( $value === 'default' ) {
-			if ( $this->mDefaultBigSelects === null ) {
-				# Function hasn't been called before so it must already be set to the default
-				return;
-			} else {
-				$value = $this->mDefaultBigSelects;
-			}
-		} elseif ( $this->mDefaultBigSelects === null ) {
-			$this->mDefaultBigSelects = (bool)$this->selectField( false, '@@sql_big_selects' );
-		}
-		$encValue = $value ? '1' : '0';
-		$this->query( "SET sql_big_selects=$encValue", __METHOD__ );
-	}
-
-	/**
-	 * DELETE where the condition is a join. MySql uses multi-table deletes.
-	 * @param $delTable string
-	 * @param $joinTable string
-	 * @param $delVar string
-	 * @param $joinVar string
-	 * @param $conds array|string
-	 * @param bool|string $fname bool
-	 * @throws DBUnexpectedError
-	 * @return bool|ResultWrapper
-	 */
-	function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabaseBase::deleteJoin' ) {
-		if ( !$conds ) {
-			throw new DBUnexpectedError( $this, 'DatabaseBase::deleteJoin() called with empty $conds' );
-		}
-
-		$delTable = $this->tableName( $delTable );
-		$joinTable = $this->tableName( $joinTable );
-		$sql = "DELETE $delTable FROM $delTable, $joinTable WHERE $delVar=$joinVar ";
-
-		if ( $conds != '*' ) {
-			$sql .= ' AND ' . $this->makeList( $conds, LIST_AND );
-		}
-
-		return $this->query( $sql, $fname );
-	}
-
-	/**
-	 * Determines how long the server has been up
-	 *
-	 * @return int
-	 */
-	function getServerUptime() {
-		$vars = $this->getMysqlStatus( 'Uptime' );
-		return (int)$vars['Uptime'];
-	}
-
-	/**
-	 * Determines if the last failure was due to a deadlock
-	 *
-	 * @return bool
-	 */
-	function wasDeadlock() {
-		return $this->lastErrno() == 1213;
-	}
-
-	/**
-	 * Determines if the last failure was due to a lock timeout
-	 *
-	 * @return bool
-	 */
-	function wasLockTimeout() {
-		return $this->lastErrno() == 1205;
-	}
-
-	/**
-	 * Determines if the last query error was something that should be dealt
-	 * with by pinging the connection and reissuing the query
-	 *
-	 * @return bool
-	 */
-	function wasErrorReissuable() {
-		return $this->lastErrno() == 2013 || $this->lastErrno() == 2006;
-	}
-
-	/**
-	 * Determines if the last failure was due to the database being read-only.
-	 *
-	 * @return bool
-	 */
-	function wasReadOnlyError() {
-		return $this->lastErrno() == 1223 ||
-			( $this->lastErrno() == 1290 && strpos( $this->lastError(), '--read-only' ) !== false );
-	}
-
-	/**
-	 * @param $oldName
-	 * @param $newName
-	 * @param $temporary bool
-	 * @param $fname string
-	 */
-	function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseMysql::duplicateTableStructure' ) {
-		$tmp = $temporary ? 'TEMPORARY ' : '';
-		$newName = $this->addIdentifierQuotes( $newName );
-		$oldName = $this->addIdentifierQuotes( $oldName );
-		$query = "CREATE $tmp TABLE $newName (LIKE $oldName)";
-		$this->query( $query, $fname );
-	}
-
-	/**
-	 * List all tables on the database
-	 *
-	 * @param string $prefix Only show tables with this prefix, e.g. mw_
-	 * @param string $fname calling function name
-	 * @return array
-	 */
-	function listTables( $prefix = null, $fname = 'DatabaseMysql::listTables' ) {
-		$result = $this->query( "SHOW TABLES", $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;
-	}
-
-	/**
-	 * @param $tableName
-	 * @param $fName string
-	 * @return bool|ResultWrapper
-	 */
-	public function dropTable( $tableName, $fName = 'DatabaseMysql::dropTable' ) {
-		if( !$this->tableExists( $tableName, $fName ) ) {
-			return false;
-		}
-		return $this->query( "DROP TABLE IF EXISTS " . $this->tableName( $tableName ), $fName );
-	}
-
-	/**
-	 * @return array
-	 */
-	protected function getDefaultSchemaVars() {
-		$vars = parent::getDefaultSchemaVars();
-		$vars['wgDBTableOptions'] = str_replace( 'TYPE', 'ENGINE', $GLOBALS['wgDBTableOptions'] );
-		$vars['wgDBTableOptions'] = str_replace( 'CHARSET=mysql4', 'CHARSET=binary', $vars['wgDBTableOptions'] );
-		return $vars;
-	}
-
-	/**
-	 * Get status information from SHOW STATUS in an associative array
-	 *
-	 * @param $which string
-	 * @return array
-	 */
-	function getMysqlStatus( $which = "%" ) {
-		$res = $this->query( "SHOW STATUS LIKE '{$which}'" );
-		$status = array();
-
-		foreach ( $res as $row ) {
-			$status[$row->Variable_name] = $row->Value;
-		}
-
-		return $status;
-	}
-
-}
-
-/**
- * Utility class.
- * @ingroup Database
- */
-class MySQLField implements Field {
-	private $name, $tablename, $default, $max_length, $nullable,
-		$is_pk, $is_unique, $is_multiple, $is_key, $type;
-
-	function __construct ( $info ) {
-		$this->name = $info->name;
-		$this->tablename = $info->table;
-		$this->default = $info->def;
-		$this->max_length = $info->max_length;
-		$this->nullable = !$info->not_null;
-		$this->is_pk = $info->primary_key;
-		$this->is_unique = $info->unique_key;
-		$this->is_multiple = $info->multiple_key;
-		$this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
-		$this->type = $info->type;
-	}
-
-	/**
-	 * @return string
-	 */
-	function name() {
-		return $this->name;
-	}
-
-	/**
-	 * @return string
-	 */
-	function tableName() {
-		return $this->tableName;
-	}
-
-	/**
-	 * @return string
-	 */
-	function type() {
-		return $this->type;
+	protected function mysqlNumFields( $res ) {
+		return mysql_num_fields( $res );
 	}
 
-	/**
-	 * @return bool
-	 */
-	function isNullable() {
-		return $this->nullable;
+	protected function mysqlFetchField( $res, $n ) {
+		return mysql_fetch_field( $res, $n );
 	}
 
-	function defaultValue() {
-		return $this->default;
+	protected function mysqlFieldName( $res, $n ) {
+		return mysql_field_name( $res, $n );
 	}
 
-	/**
-	 * @return bool
-	 */
-	function isKey() {
-		return $this->is_key;
+	protected function mysqlDataSeek( $res, $row ) {
+		return mysql_data_seek( $res, $row );
 	}
 
-	/**
-	 * @return bool
-	 */
-	function isMultipleKey() {
-		return $this->is_multiple;
+	protected function mysqlError( $conn = null ) {
+		return ( $conn !== null ) ? mysql_error( $conn ) : mysql_error(); // avoid warning
 	}
-}
-
-class MySQLMasterPos implements DBMasterPos {
-	var $file, $pos;
 
-	function __construct( $file, $pos ) {
-		$this->file = $file;
-		$this->pos = $pos;
+	protected function mysqlRealEscapeString( $s ) {
+		return mysql_real_escape_string( $s, $this->mConn );
 	}
 
-	function __toString() {
-		return "{$this->file}/{$this->pos}";
+	protected function mysqlPing() {
+		return mysql_ping( $this->mConn );
 	}
 }