MediaWiki 1.7.1 wiederhergestellt

1 files changed, 2020 insertions, 0 deletions

diff --git a/includes/Database.php b/includes/Database.php
new file mode 100644
index 00000000..f8e579b4
--- /dev/null
+++ b/includes/Database.php
@@ -0,0 +1,2020 @@
+<?php
+/**
+ * This file deals with MySQL interface functions
+ * and query specifics/optimisations
+ * @package MediaWiki
+ */
+
+/** See Database::makeList() */
+define( 'LIST_COMMA', 0 );
+define( 'LIST_AND', 1 );
+define( 'LIST_SET', 2 );
+define( 'LIST_NAMES', 3);
+define( 'LIST_OR', 4);
+
+/** Number of times to re-try an operation in case of deadlock */
+define( 'DEADLOCK_TRIES', 4 );
+/** Minimum time to wait before retry, in microseconds */
+define( 'DEADLOCK_DELAY_MIN', 500000 );
+/** Maximum time to wait before retry */
+define( 'DEADLOCK_DELAY_MAX', 1500000 );
+
+/******************************************************************************
+ * Utility classes
+ *****************************************************************************/
+
+class DBObject {
+	public $mData;
+
+	function DBObject($data) {
+		$this->mData = $data;
+	}
+
+	function isLOB() {
+		return false;
+	}
+
+	function data() {
+		return $this->mData;
+	}
+};
+
+/******************************************************************************
+ * Error classes
+ *****************************************************************************/
+
+/**
+ * Database error base class
+ */
+class DBError extends MWException {
+	public $db;
+
+	/**
+	 * Construct a database error
+	 * @param Database $db The database object which threw the error
+	 * @param string $error A simple error message to be used for debugging
+	 */
+	function __construct( Database &$db, $error ) {
+		$this->db =& $db;
+		parent::__construct( $error );
+	}
+}
+
+class DBConnectionError extends DBError {
+	public $error;
+	
+	function __construct( Database &$db, $error = 'unknown error' ) {
+		$msg = 'DB connection error';
+		if ( trim( $error ) != '' ) {
+			$msg .= ": $error";
+		}
+		$this->error = $error;
+		parent::__construct( $db, $msg );
+	}
+
+	function useOutputPage() {
+		// Not likely to work
+		return false;
+	}
+
+	function useMessageCache() {
+		// Not likely to work
+		return false;
+	}
+	
+	function getText() {
+		return $this->getMessage() . "\n";
+	}
+
+	function getPageTitle() {
+		global $wgSitename;
+		return "$wgSitename has a problem";
+	}
+
+	function getHTML() {
+		global $wgTitle, $wgUseFileCache, $title, $wgInputEncoding, $wgOutputEncoding;
+		global $wgSitename, $wgServer, $wgMessageCache, $wgLogo;
+
+		# I give up, Brion is right. Getting the message cache to work when there is no DB is tricky.
+		# Hard coding strings instead.
+
+		$noconnect = "<p><strong>Sorry! This site is experiencing technical difficulties.</strong></p><p>Try waiting a few minutes and reloading.</p><p><small>(Can't contact the database server: $1)</small></p>";
+		$mainpage = 'Main Page';
+		$searchdisabled = <<<EOT
+<p style="margin: 1.5em 2em 1em">$wgSitename search is disabled for performance reasons. You can search via Google in the meantime.
+<span style="font-size: 89%; display: block; margin-left: .2em">Note that their indexes of $wgSitename content may be out of date.</span></p>',
+EOT;
+
+		$googlesearch = "
+<!-- SiteSearch Google -->
+<FORM method=GET action=\"http://www.google.com/search\">
+<TABLE bgcolor=\"#FFFFFF\"><tr><td>
+<A HREF=\"http://www.google.com/\">
+<IMG SRC=\"http://www.google.com/logos/Logo_40wht.gif\"
+border=\"0\" ALT=\"Google\"></A>
+</td>
+<td>
+<INPUT TYPE=text name=q size=31 maxlength=255 value=\"$1\">
+<INPUT type=submit name=btnG VALUE=\"Google Search\">
+<font size=-1>
+<input type=hidden name=domains value=\"$wgServer\"><br /><input type=radio name=sitesearch value=\"\"> WWW <input type=radio name=sitesearch value=\"$wgServer\" checked> $wgServer <br />
+<input type='hidden' name='ie' value='$2'>
+<input type='hidden' name='oe' value='$2'>
+</font>
+</td></tr></TABLE>
+</FORM>
+<!-- SiteSearch Google -->";
+		$cachederror = "The following is a cached copy of the requested page, and may not be up to date. ";
+
+		# No database access
+		if ( is_object( $wgMessageCache ) ) {
+			$wgMessageCache->disable();
+		}
+
+		if ( trim( $this->error ) == '' ) {
+			$this->error = $this->db->getProperty('mServer');
+		}
+
+		$text = str_replace( '$1', $this->error, $noconnect );
+		$text .= wfGetSiteNotice();
+
+		if($wgUseFileCache) {
+			if($wgTitle) {
+				$t =& $wgTitle;
+			} else {
+				if($title) {
+					$t = Title::newFromURL( $title );
+				} elseif (@/**/$_REQUEST['search']) {
+					$search = $_REQUEST['search'];
+					return $searchdisabled .
+					  str_replace( array( '$1', '$2' ), array( htmlspecialchars( $search ),
+					  $wgInputEncoding ), $googlesearch );
+				} else {
+					$t = Title::newFromText( $mainpage );
+				}
+			}
+
+			$cache = new CacheManager( $t );
+			if( $cache->isFileCached() ) {
+				$msg = '<p style="color: red"><b>'.$msg."<br />\n" .
+					$cachederror . "</b></p>\n";
+
+				$tag = '<div id="article">';
+				$text = str_replace(
+					$tag,
+					$tag . $msg,
+					$cache->fetchPageText() );
+			}
+		}
+
+		return $text;
+	}
+}
+
+class DBQueryError extends DBError {
+	public $error, $errno, $sql, $fname;
+	
+	function __construct( Database &$db, $error, $errno, $sql, $fname ) {
+		$message = "A database error has occurred\n" .
+		  "Query: $sql\n" .
+		  "Function: $fname\n" .
+		  "Error: $errno $error\n";
+
+		parent::__construct( $db, $message );
+		$this->error = $error;
+		$this->errno = $errno;
+		$this->sql = $sql;
+		$this->fname = $fname;
+	}
+
+	function getText() {
+		if ( $this->useMessageCache() ) {
+			return wfMsg( 'dberrortextcl', htmlspecialchars( $this->getSQL() ),
+			  htmlspecialchars( $this->fname ), $this->errno, htmlspecialchars( $this->error ) ) . "\n";
+		} else {
+			return $this->getMessage();
+		}
+	}
+	
+	function getSQL() {
+		global $wgShowSQLErrors;
+		if( !$wgShowSQLErrors ) {
+			return $this->msg( 'sqlhidden', 'SQL hidden' );
+		} else {
+			return $this->sql;
+		}
+	}
+	
+	function getPageTitle() {
+		return $this->msg( 'databaseerror', 'Database error' );
+	}
+
+	function getHTML() {
+		if ( $this->useMessageCache() ) {
+			return wfMsgNoDB( 'dberrortext', htmlspecialchars( $this->getSQL() ),
+			  htmlspecialchars( $this->fname ), $this->errno, htmlspecialchars( $this->error ) );
+		} else {
+			return nl2br( htmlspecialchars( $this->getMessage() ) );
+		}
+	}
+}
+
+class DBUnexpectedError extends DBError {}
+
+/******************************************************************************/
+
+/**
+ * Database abstraction object
+ * @package MediaWiki
+ */
+class Database {
+
+#------------------------------------------------------------------------------
+# Variables
+#------------------------------------------------------------------------------
+
+	protected $mLastQuery = '';
+
+	protected $mServer, $mUser, $mPassword, $mConn = null, $mDBname;
+	protected $mOut, $mOpened = false;
+
+	protected $mFailFunction;
+	protected $mTablePrefix;
+	protected $mFlags;
+	protected $mTrxLevel = 0;
+	protected $mErrorCount = 0;
+	protected $mLBInfo = array();
+
+#------------------------------------------------------------------------------
+# Accessors
+#------------------------------------------------------------------------------
+	# These optionally set a variable and return the previous state
+
+	/**
+	 * Fail function, takes a Database as a parameter
+	 * Set to false for default, 1 for ignore errors
+	 */
+	function failFunction( $function = NULL ) {
+		return wfSetVar( $this->mFailFunction, $function );
+	}
+
+	/**
+	 * Output page, used for reporting errors
+	 * FALSE means discard output
+	 */
+	function setOutputPage( $out ) {
+		$this->mOut = $out;
+	}
+
+	/**
+	 * Boolean, controls output of large amounts of debug information
+	 */
+	function debug( $debug = NULL ) {
+		return wfSetBit( $this->mFlags, DBO_DEBUG, $debug );
+	}
+
+	/**
+	 * Turns buffering of SQL result sets on (true) or off (false).
+	 * Default is "on" and it should not be changed without good reasons.
+	 */
+	function bufferResults( $buffer = NULL ) {
+		if ( is_null( $buffer ) ) {
+			return !(bool)( $this->mFlags & DBO_NOBUFFER );
+		} else {
+			return !wfSetBit( $this->mFlags, DBO_NOBUFFER, !$buffer );
+		}
+	}
+
+	/**
+	 * Turns on (false) or off (true) the automatic generation and sending
+	 * of a "we're sorry, but there has been a database error" page on
+	 * database errors. Default is on (false). When turned off, the
+	 * code should use wfLastErrno() and wfLastError() to handle the
+	 * situation as appropriate.
+	 */
+	function ignoreErrors( $ignoreErrors = NULL ) {
+		return wfSetBit( $this->mFlags, DBO_IGNORE, $ignoreErrors );
+	}
+
+	/**
+	 * The current depth of nested transactions
+	 * @param $level Integer: , default NULL.
+	 */
+	function trxLevel( $level = NULL ) {
+		return wfSetVar( $this->mTrxLevel, $level );
+	}
+
+	/**
+	 * Number of errors logged, only useful when errors are ignored
+	 */
+	function errorCount( $count = NULL ) {
+		return wfSetVar( $this->mErrorCount, $count );
+	}
+
+	/**
+	 * Properties passed down from the server info array of the load balancer
+	 */
+	function getLBInfo( $name = NULL ) {
+		if ( is_null( $name ) ) {
+			return $this->mLBInfo;
+		} else {
+			if ( array_key_exists( $name, $this->mLBInfo ) ) {
+				return $this->mLBInfo[$name];
+			} else {
+				return NULL;
+			}
+		}
+	}
+
+	function setLBInfo( $name, $value = NULL ) {
+		if ( is_null( $value ) ) {
+			$this->mLBInfo = $name;
+		} else {
+			$this->mLBInfo[$name] = $value;
+		}
+	}
+
+	/**#@+
+	 * Get function
+	 */
+	function lastQuery() { return $this->mLastQuery; }
+	function isOpen() { return $this->mOpened; }
+	/**#@-*/
+
+	function setFlag( $flag ) {
+		$this->mFlags |= $flag;
+	}
+
+	function clearFlag( $flag ) {
+		$this->mFlags &= ~$flag;
+	}
+
+	function getFlag( $flag ) {
+		return !!($this->mFlags & $flag);
+	}
+
+	/**
+	 * General read-only accessor
+	 */
+	function getProperty( $name ) {
+		return $this->$name;
+	}
+
+#------------------------------------------------------------------------------
+# Other functions
+#------------------------------------------------------------------------------
+
+	/**@{{
+	 * @param string $server database server host
+	 * @param string $user database user name
+	 * @param string $password database user password
+	 * @param string $dbname database name
+	 */
+
+	/**
+	 * @param failFunction
+	 * @param $flags
+	 * @param $tablePrefix String: database table prefixes. By default use the prefix gave in LocalSettings.php
+	 */
+	function __construct( $server = false, $user = false, $password = false, $dbName = false,
+		$failFunction = false, $flags = 0, $tablePrefix = 'get from global' ) {
+
+		global $wgOut, $wgDBprefix, $wgCommandLineMode;
+		# Can't get a reference if it hasn't been set yet
+		if ( !isset( $wgOut ) ) {
+			$wgOut = NULL;
+		}
+		$this->mOut =& $wgOut;
+
+		$this->mFailFunction = $failFunction;
+		$this->mFlags = $flags;
+
+		if ( $this->mFlags & DBO_DEFAULT ) {
+			if ( $wgCommandLineMode ) {
+				$this->mFlags &= ~DBO_TRX;
+			} else {
+				$this->mFlags |= DBO_TRX;
+			}
+		}
+
+		/*
+		// Faster read-only access
+		if ( wfReadOnly() ) {
+			$this->mFlags |= DBO_PERSISTENT;
+			$this->mFlags &= ~DBO_TRX;
+		}*/
+
+		/** Get the default table prefix*/
+		if ( $tablePrefix == 'get from global' ) {
+			$this->mTablePrefix = $wgDBprefix;
+		} else {
+			$this->mTablePrefix = $tablePrefix;
+		}
+
+		if ( $server ) {
+			$this->open( $server, $user, $password, $dbName );
+		}
+	}
+
+	/**
+	 * @static
+	 * @param failFunction
+	 * @param $flags
+	 */
+	static function newFromParams( $server, $user, $password, $dbName,
+		$failFunction = false, $flags = 0 )
+	{
+		return new Database( $server, $user, $password, $dbName, $failFunction, $flags );
+	}
+
+	/**
+	 * Usually aborts on failure
+	 * If the failFunction is set to a non-zero integer, returns success
+	 */
+	function open( $server, $user, $password, $dbName ) {
+		global $wguname;
+
+		# Test for missing mysql.so
+		# First try to load it
+		if (!@extension_loaded('mysql')) {
+			@dl('mysql.so');
+		}
+
+		# Fail now
+		# Otherwise we get a suppressed fatal error, which is very hard to track down
+		if ( !function_exists( 'mysql_connect' ) ) {
+			throw new DBConnectionError( $this, "MySQL functions missing, have you compiled PHP with the --with-mysql option?\n" );
+		}
+
+		$this->close();
+		$this->mServer = $server;
+		$this->mUser = $user;
+		$this->mPassword = $password;
+		$this->mDBname = $dbName;
+
+		$success = false;
+
+		if ( $this->mFlags & DBO_PERSISTENT ) {
+			@/**/$this->mConn = mysql_pconnect( $server, $user, $password );
+		} else {
+			# Create a new connection...
+			@/**/$this->mConn = mysql_connect( $server, $user, $password, true );
+		}
+
+		if ( $dbName != '' ) {
+			if ( $this->mConn !== false ) {
+				$success = @/**/mysql_select_db( $dbName, $this->mConn );
+				if ( !$success ) {
+					$error = "Error selecting database $dbName on server {$this->mServer} " .
+						"from client host {$wguname['nodename']}\n";
+					wfDebug( $error );
+				}
+			} else {
+				wfDebug( "DB connection error\n" );
+				wfDebug( "Server: $server, User: $user, Password: " .
+					substr( $password, 0, 3 ) . "..., error: " . mysql_error() . "\n" );
+				$success = false;
+			}
+		} else {
+			# Delay USE query
+			$success = (bool)$this->mConn;
+		}
+
+		if ( !$success ) {
+			$this->reportConnectionError();
+		}
+
+		global $wgDBmysql5;
+		if( $wgDBmysql5 ) {
+			// Tell the server we're communicating with it in UTF-8.
+			// This may engage various charset conversions.
+			$this->query( 'SET NAMES utf8' );
+		}
+
+		$this->mOpened = $success;
+		return $success;
+	}
+	/**@}}*/
+
+	/**
+	 * Closes a database connection.
+	 * if it is open : commits any open transactions
+	 *
+	 * @return bool operation success. true if already closed.
+	 */
+	function close()
+	{
+		$this->mOpened = false;
+		if ( $this->mConn ) {
+			if ( $this->trxLevel() ) {
+				$this->immediateCommit();
+			}
+			return mysql_close( $this->mConn );
+		} else {
+			return true;
+		}
+	}
+
+	/**
+	 * @param string $error fallback error message, used if none is given by MySQL
+	 */
+	function reportConnectionError( $error = 'Unknown error' ) {
+		$myError = $this->lastError();
+		if ( $myError ) {
+			$error = $myError;
+		}
+
+		if ( $this->mFailFunction ) {
+			# Legacy error handling method
+			if ( !is_int( $this->mFailFunction ) ) {
+				$ff = $this->mFailFunction;
+				$ff( $this, $error );
+			}
+		} else {
+			# New method
+			wfLogDBError( "Connection error: $error\n" );
+			throw new DBConnectionError( $this, $error );
+		}
+	}
+
+	/**
+	 * Usually aborts on failure
+	 * If errors are explicitly ignored, returns success
+	 */
+	function query( $sql, $fname = '', $tempIgnore = false ) {
+		global $wgProfiling;
+
+		if ( $wgProfiling ) {
+			# generalizeSQL will probably cut down the query to reasonable
+			# logging size most of the time. The substr is really just a sanity check.
+
+			# Who's been wasting my precious column space? -- TS
+			#$profName = 'query: ' . $fname . ' ' . substr( Database::generalizeSQL( $sql ), 0, 255 );
+
+			if ( is_null( $this->getLBInfo( 'master' ) ) ) {
+				$queryProf = 'query: ' . substr( Database::generalizeSQL( $sql ), 0, 255 );
+				$totalProf = 'Database::query';
+			} else {
+				$queryProf = 'query-m: ' . substr( Database::generalizeSQL( $sql ), 0, 255 );
+				$totalProf = 'Database::query-master';
+			}
+			wfProfileIn( $totalProf );
+			wfProfileIn( $queryProf );
+		}
+
+		$this->mLastQuery = $sql;
+
+		# Add a comment for easy SHOW PROCESSLIST interpretation
+		if ( $fname ) {
+			$commentedSql = preg_replace("/\s/", " /* $fname */ ", $sql, 1);
+		} else {
+			$commentedSql = $sql;
+		}
+
+		# If DBO_TRX is set, start a transaction
+		if ( ( $this->mFlags & DBO_TRX ) && !$this->trxLevel() && 
+			$sql != 'BEGIN' && $sql != 'COMMIT' && $sql != 'ROLLBACK' 
+		) {
+			$this->begin();
+		}
+
+		if ( $this->debug() ) {
+			$sqlx = substr( $commentedSql, 0, 500 );
+			$sqlx = strtr( $sqlx, "\t\n", '  ' );
+			wfDebug( "SQL: $sqlx\n" );
+		}
+
+		# Do the query and handle errors
+		$ret = $this->doQuery( $commentedSql );
+
+		# Try reconnecting if the connection was lost
+		if ( false === $ret && ( $this->lastErrno() == 2013 || $this->lastErrno() == 2006 ) ) {
+			# Transaction is gone, like it or not
+			$this->mTrxLevel = 0;
+			wfDebug( "Connection lost, reconnecting...\n" );
+			if ( $this->ping() ) {
+				wfDebug( "Reconnected\n" );
+				$ret = $this->doQuery( $commentedSql );
+			} else {
+				wfDebug( "Failed\n" );
+			}
+		}
+
+		if ( false === $ret ) {
+			$this->reportQueryError( $this->lastError(), $this->lastErrno(), $sql, $fname, $tempIgnore );
+		}
+
+		if ( $wgProfiling ) {
+			wfProfileOut( $queryProf );
+			wfProfileOut( $totalProf );
+		}
+		return $ret;
+	}
+
+	/**
+	 * The DBMS-dependent part of query()
+	 * @param string $sql SQL query.
+	 */
+	function doQuery( $sql ) {
+		if( $this->bufferResults() ) {
+			$ret = mysql_query( $sql, $this->mConn );
+		} else {
+			$ret = mysql_unbuffered_query( $sql, $this->mConn );
+		}
+		return $ret;
+	}
+
+	/**
+	 * @param $error
+	 * @param $errno
+	 * @param $sql
+	 * @param string $fname
+	 * @param bool $tempIgnore
+	 */
+	function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
+		global $wgCommandLineMode, $wgFullyInitialised, $wgColorErrors;
+		# Ignore errors during error handling to avoid infinite recursion
+		$ignore = $this->ignoreErrors( true );
+		++$this->mErrorCount;
+
+		if( $ignore || $tempIgnore ) {
+			wfDebug("SQL ERROR (ignored): $error\n");
+			$this->ignoreErrors( $ignore );
+		} else {
+			$sql1line = str_replace( "\n", "\\n", $sql );
+			wfLogDBError("$fname\t{$this->mServer}\t$errno\t$error\t$sql1line\n");
+			wfDebug("SQL ERROR: " . $error . "\n");
+			throw new DBQueryError( $this, $error, $errno, $sql, $fname );
+		}
+	}
+
+
+	/**
+	 * Intended to be compatible with the PEAR::DB wrapper functions.
+	 * http://pear.php.net/manual/en/package.database.db.intro-execute.php
+	 *
+	 * ? = scalar value, quoted as necessary
+	 * ! = raw SQL bit (a function for instance)
+	 * & = filename; reads the file and inserts as a blob
+	 *     (we don't use this though...)
+	 */
+	function prepare( $sql, $func = 'Database::prepare' ) {
+		/* MySQL doesn't support prepared statements (yet), so just
+		   pack up the query for reference. We'll manually replace
+		   the bits later. */
+		return array( 'query' => $sql, 'func' => $func );
+	}
+
+	function freePrepared( $prepared ) {
+		/* No-op for MySQL */
+	}
+
+	/**
+	 * Execute a prepared query with the various arguments
+	 * @param string $prepared the prepared sql
+	 * @param mixed $args Either an array here, or put scalars as varargs
+	 */
+	function execute( $prepared, $args = null ) {
+		if( !is_array( $args ) ) {
+			# Pull the var args
+			$args = func_get_args();
+			array_shift( $args );
+		}
+		$sql = $this->fillPrepared( $prepared['query'], $args );
+		return $this->query( $sql, $prepared['func'] );
+	}
+
+	/**
+	 * Prepare & execute an SQL statement, quoting and inserting arguments
+	 * in the appropriate places.
+	 * @param string $query
+	 * @param string $args ...
+	 */
+	function safeQuery( $query, $args = null ) {
+		$prepared = $this->prepare( $query, 'Database::safeQuery' );
+		if( !is_array( $args ) ) {
+			# Pull the var args
+			$args = func_get_args();
+			array_shift( $args );
+		}
+		$retval = $this->execute( $prepared, $args );
+		$this->freePrepared( $prepared );
+		return $retval;
+	}
+
+	/**
+	 * For faking prepared SQL statements on DBs that don't support
+	 * it directly.
+	 * @param string $preparedSql - a 'preparable' SQL statement
+	 * @param array $args - array of arguments to fill it with
+	 * @return string executable SQL
+	 */
+	function fillPrepared( $preparedQuery, $args ) {
+		reset( $args );
+		$this->preparedArgs =& $args;
+		return preg_replace_callback( '/(\\\\[?!&]|[?!&])/',
+			array( &$this, 'fillPreparedArg' ), $preparedQuery );
+	}
+
+	/**
+	 * preg_callback func for fillPrepared()
+	 * The arguments should be in $this->preparedArgs and must not be touched
+	 * while we're doing this.
+	 *
+	 * @param array $matches
+	 * @return string
+	 * @private
+	 */
+	function fillPreparedArg( $matches ) {
+		switch( $matches[1] ) {
+			case '\\?': return '?';
+			case '\\!': return '!';
+			case '\\&': return '&';
+		}
+		list( $n, $arg ) = each( $this->preparedArgs );
+		switch( $matches[1] ) {
+			case '?': return $this->addQuotes( $arg );
+			case '!': return $arg;
+			case '&':
+				# return $this->addQuotes( file_get_contents( $arg ) );
+				throw new DBUnexpectedError( $this, '& mode is not implemented. If it\'s really needed, uncomment the line above.' );
+			default:
+				throw new DBUnexpectedError( $this, 'Received invalid match. This should never happen!' );
+		}
+	}
+
+	/**#@+
+	 * @param mixed $res A SQL result
+	 */
+	/**
+	 * Free a result object
+	 */
+	function freeResult( $res ) {
+		if ( !@/**/mysql_free_result( $res ) ) {
+			throw new DBUnexpectedError( $this, "Unable to free MySQL result" );
+		}
+	}
+
+	/**
+	 * Fetch the next row from the given result object, in object form
+	 */
+	function fetchObject( $res ) {
+		@/**/$row = mysql_fetch_object( $res );
+		if( mysql_errno() ) {
+			throw new DBUnexpectedError( $this, 'Error in fetchObject(): ' . htmlspecialchars( mysql_error() ) );
+		}
+		return $row;
+	}
+
+	/**
+	 * Fetch the next row from the given result object
+	 * Returns an array
+	 */
+ 	function fetchRow( $res ) {
+		@/**/$row = mysql_fetch_array( $res );
+		if (mysql_errno() ) {
+			throw new DBUnexpectedError( $this, 'Error in fetchRow(): ' . htmlspecialchars( mysql_error() ) );
+		}
+		return $row;
+	}
+
+	/**
+	 * Get the number of rows in a result object
+	 */
+	function numRows( $res ) {
+		@/**/$n = mysql_num_rows( $res );
+		if( mysql_errno() ) {
+			throw new DBUnexpectedError( $this, 'Error in numRows(): ' . htmlspecialchars( mysql_error() ) );
+		}
+		return $n;
+	}
+
+	/**
+	 * Get the number of fields in a result object
+	 * See documentation for mysql_num_fields()
+	 */
+	function numFields( $res ) { return mysql_num_fields( $res ); }
+
+	/**
+	 * Get a field name in a result object
+	 * See documentation for mysql_field_name():
+	 * http://www.php.net/mysql_field_name
+	 */
+	function fieldName( $res, $n ) { return mysql_field_name( $res, $n ); }
+
+	/**
+	 * Get the inserted value of an auto-increment row
+	 *
+	 * The value inserted should be fetched from nextSequenceValue()
+	 *
+	 * Example:
+	 * $id = $dbw->nextSequenceValue('page_page_id_seq');
+	 * $dbw->insert('page',array('page_id' => $id));
+	 * $id = $dbw->insertId();
+	 */
+	function insertId() { return mysql_insert_id( $this->mConn ); }
+
+	/**
+	 * Change the position of the cursor in a result object
+	 * See mysql_data_seek()
+	 */
+	function dataSeek( $res, $row ) { return mysql_data_seek( $res, $row ); }
+
+	/**
+	 * Get the last error number
+	 * See mysql_errno()
+	 */
+	function lastErrno() {
+		if ( $this->mConn ) {
+			return mysql_errno( $this->mConn );
+		} else {
+			return mysql_errno();
+		}
+	}
+
+	/**
+	 * Get a description of the last error
+	 * See mysql_error() for more details
+	 */
+	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;
+	}
+	/**
+	 * Get the number of rows affected by the last write query
+	 * See mysql_affected_rows() for more details
+	 */
+	function affectedRows() { return mysql_affected_rows( $this->mConn ); }
+	/**#@-*/ // end of template : @param $result
+
+	/**
+	 * Simple UPDATE wrapper
+	 * Usually aborts on failure
+	 * If errors are explicitly ignored, returns success
+	 *
+	 * This function exists for historical reasons, Database::update() has a more standard
+	 * calling convention and feature set
+	 */
+	function set( $table, $var, $value, $cond, $fname = 'Database::set' )
+	{
+		$table = $this->tableName( $table );
+		$sql = "UPDATE $table SET $var = '" .
+		  $this->strencode( $value ) . "' WHERE ($cond)";
+		return (bool)$this->query( $sql, $fname );
+	}
+
+	/**
+	 * Simple SELECT wrapper, returns a single field, input must be encoded
+	 * Usually aborts on failure
+	 * If errors are explicitly ignored, returns FALSE on failure
+	 */
+	function selectField( $table, $var, $cond='', $fname = 'Database::selectField', $options = array() ) {
+		if ( !is_array( $options ) ) {
+			$options = array( $options );
+		}
+		$options['LIMIT'] = 1;
+
+		$res = $this->select( $table, $var, $cond, $fname, $options );
+		if ( $res === false || !$this->numRows( $res ) ) {
+			return false;
+		}
+		$row = $this->fetchRow( $res );
+		if ( $row !== false ) {
+			$this->freeResult( $res );
+			return $row[0];
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * Returns an optional USE INDEX clause to go after the table, and a
+	 * string to go at the end of the query
+	 *
+	 * @private
+	 *
+	 * @param array $options an associative array of options to be turned into
+	 *              an SQL query, valid keys are listed in the function.
+	 * @return array
+	 */
+	function makeSelectOptions( $options ) {
+		$tailOpts = '';
+		$startOpts = '';
+
+		$noKeyOptions = array();
+		foreach ( $options as $key => $option ) {
+			if ( is_numeric( $key ) ) {
+				$noKeyOptions[$option] = true;
+			}
+		}
+
+		if ( isset( $options['GROUP BY'] ) ) $tailOpts .= " GROUP BY {$options['GROUP BY']}";
+		if ( isset( $options['ORDER BY'] ) ) $tailOpts .= " ORDER BY {$options['ORDER BY']}";
+		
+		if (isset($options['LIMIT'])) {
+			$tailOpts .= $this->limitResult('', $options['LIMIT'],
+				isset($options['OFFSET']) ? $options['OFFSET'] : false);
+		}
+
+		if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
+		if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
+		if ( isset( $noKeyOptions['DISTINCT'] ) && isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
+
+		# Various MySQL extensions
+		if ( isset( $noKeyOptions['HIGH_PRIORITY'] ) ) $startOpts .= ' HIGH_PRIORITY';
+		if ( isset( $noKeyOptions['SQL_BIG_RESULT'] ) ) $startOpts .= ' SQL_BIG_RESULT';
+		if ( isset( $noKeyOptions['SQL_BUFFER_RESULT'] ) ) $startOpts .= ' SQL_BUFFER_RESULT';
+		if ( isset( $noKeyOptions['SQL_SMALL_RESULT'] ) ) $startOpts .= ' SQL_SMALL_RESULT';
+		if ( isset( $noKeyOptions['SQL_CALC_FOUND_ROWS'] ) ) $startOpts .= ' SQL_CALC_FOUND_ROWS';
+		if ( isset( $noKeyOptions['SQL_CACHE'] ) ) $startOpts .= ' SQL_CACHE';
+		if ( isset( $noKeyOptions['SQL_NO_CACHE'] ) ) $startOpts .= ' SQL_NO_CACHE';
+
+		if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
+			$useIndex = $this->useIndexClause( $options['USE INDEX'] );
+		} else {
+			$useIndex = '';
+		}
+		
+		return array( $startOpts, $useIndex, $tailOpts );
+	}
+
+	/**
+	 * SELECT wrapper
+	 */
+	function select( $table, $vars, $conds='', $fname = 'Database::select', $options = array() )
+	{
+		if( is_array( $vars ) ) {
+			$vars = implode( ',', $vars );
+		}
+		if( !is_array( $options ) ) {
+			$options = array( $options );
+		}
+		if( is_array( $table ) ) {
+			if ( @is_array( $options['USE INDEX'] ) )
+				$from = ' FROM ' . $this->tableNamesWithUseIndex( $table, $options['USE INDEX'] );
+			else
+				$from = ' FROM ' . implode( ',', array_map( array( &$this, 'tableName' ), $table ) );
+		} elseif ($table!='') {
+			$from = ' FROM ' . $this->tableName( $table );
+		} else {
+			$from = '';
+		}
+
+		list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $options );
+
+		if( !empty( $conds ) ) {
+			if ( is_array( $conds ) ) {
+				$conds = $this->makeList( $conds, LIST_AND );
+			}
+			$sql = "SELECT $startOpts $vars $from $useIndex WHERE $conds $tailOpts";
+		} else {
+			$sql = "SELECT $startOpts $vars $from $useIndex $tailOpts";
+		}
+
+		return $this->query( $sql, $fname );
+	}
+
+	/**
+	 * Single row SELECT wrapper
+	 * Aborts or returns FALSE on error
+	 *
+	 * $vars: the selected variables
+	 * $conds: a condition map, terms are ANDed together.
+	 *   Items with numeric keys are taken to be literal conditions
+	 * Takes an array of selected variables, and a condition map, which is ANDed
+	 * e.g: selectRow( "page", array( "page_id" ), array( "page_namespace" =>
+	 * NS_MAIN, "page_title" => "Astronomy" ) )   would return an object where
+	 * $obj- >page_id is the ID of the Astronomy article
+	 *
+	 * @todo migrate documentation to phpdocumentor format
+	 */
+	function selectRow( $table, $vars, $conds, $fname = 'Database::selectRow', $options = array() ) {
+		$options['LIMIT'] = 1;
+		$res = $this->select( $table, $vars, $conds, $fname, $options );
+		if ( $res === false )
+			return false;
+		if ( !$this->numRows($res) ) {
+			$this->freeResult($res);
+			return false;
+		}
+		$obj = $this->fetchObject( $res );
+		$this->freeResult( $res );
+		return $obj;
+
+	}
+
+	/**
+	 * Removes most variables from an SQL query and replaces them with X or N for numbers.
+	 * It's only slightly flawed. Don't use for anything important.
+	 *
+	 * @param string $sql A SQL Query
+	 * @static
+	 */
+	static function generalizeSQL( $sql ) {
+		# This does the same as the regexp below would do, but in such a way
+		# as to avoid crashing php on some large strings.
+		# $sql = preg_replace ( "/'([^\\\\']|\\\\.)*'|\"([^\\\\\"]|\\\\.)*\"/", "'X'", $sql);
+
+		$sql = str_replace ( "\\\\", '', $sql);
+		$sql = str_replace ( "\\'", '', $sql);
+		$sql = str_replace ( "\\\"", '', $sql);
+		$sql = preg_replace ("/'.*'/s", "'X'", $sql);
+		$sql = preg_replace ('/".*"/s', "'X'", $sql);
+
+		# All newlines, tabs, etc replaced by single space
+		$sql = preg_replace ( "/\s+/", ' ', $sql);
+
+		# All numbers => N
+		$sql = preg_replace ('/-?[0-9]+/s', 'N', $sql);
+
+		return $sql;
+	}
+
+	/**
+	 * Determines whether a field exists in a table
+	 * Usually aborts on failure
+	 * If errors are explicitly ignored, returns NULL on failure
+	 */
+	function fieldExists( $table, $field, $fname = 'Database::fieldExists' ) {
+		$table = $this->tableName( $table );
+		$res = $this->query( 'DESCRIBE '.$table, $fname );
+		if ( !$res ) {
+			return NULL;
+		}
+
+		$found = false;
+
+		while ( $row = $this->fetchObject( $res ) ) {
+			if ( $row->Field == $field ) {
+				$found = true;
+				break;
+			}
+		}
+		return $found;
+	}
+
+	/**
+	 * Determines whether an index exists
+	 * Usually aborts on failure
+	 * If errors are explicitly ignored, returns NULL on failure
+	 */
+	function indexExists( $table, $index, $fname = 'Database::indexExists' ) {
+		$info = $this->indexInfo( $table, $index, $fname );
+		if ( is_null( $info ) ) {
+			return NULL;
+		} else {
+			return $info !== false;
+		}
+	}
+
+
+	/**
+	 * Get information about an index into an object
+	 * Returns false if the index does not exist
+	 */
+	function indexInfo( $table, $index, $fname = 'Database::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 );
+		$sql = 'SHOW INDEX FROM '.$table;
+		$res = $this->query( $sql, $fname );
+		if ( !$res ) {
+			return NULL;
+		}
+
+		while ( $row = $this->fetchObject( $res ) ) {
+			if ( $row->Key_name == $index ) {
+				return $row;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Query whether a given table exists
+	 */
+	function tableExists( $table ) {
+		$table = $this->tableName( $table );
+		$old = $this->ignoreErrors( true );
+		$res = $this->query( "SELECT 1 FROM $table LIMIT 1" );
+		$this->ignoreErrors( $old );
+		if( $res ) {
+			$this->freeResult( $res );
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * mysql_fetch_field() wrapper
+	 * Returns false if the field doesn't exist
+	 *
+	 * @param $table
+	 * @param $field
+	 */
+	function fieldInfo( $table, $field ) {
+		$table = $this->tableName( $table );
+		$res = $this->query( "SELECT * FROM $table LIMIT 1" );
+		$n = mysql_num_fields( $res );
+		for( $i = 0; $i < $n; $i++ ) {
+			$meta = mysql_fetch_field( $res, $i );
+			if( $field == $meta->name ) {
+				return $meta;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * mysql_field_type() wrapper
+	 */
+	function fieldType( $res, $index ) {
+		return mysql_field_type( $res, $index );
+	}
+
+	/**
+	 * Determines if a given index is unique
+	 */
+	function indexUnique( $table, $index ) {
+		$indexInfo = $this->indexInfo( $table, $index );
+		if ( !$indexInfo ) {
+			return NULL;
+		}
+		return !$indexInfo->Non_unique;
+	}
+
+	/**
+	 * INSERT wrapper, inserts an array into a table
+	 *
+	 * $a may be a single associative array, or an array of these with numeric keys, for
+	 * multi-row insert.
+	 *
+	 * Usually aborts on failure
+	 * If errors are explicitly ignored, returns success
+	 */
+	function insert( $table, $a, $fname = 'Database::insert', $options = array() ) {
+		# No rows to insert, easy just return now
+		if ( !count( $a ) ) {
+			return true;
+		}
+
+		$table = $this->tableName( $table );
+		if ( !is_array( $options ) ) {
+			$options = array( $options );
+		}
+		if ( isset( $a[0] ) && is_array( $a[0] ) ) {
+			$multi = true;
+			$keys = array_keys( $a[0] );
+		} else {
+			$multi = false;
+			$keys = array_keys( $a );
+		}
+
+		$sql = 'INSERT ' . implode( ' ', $options ) .
+			" INTO $table (" . implode( ',', $keys ) . ') VALUES ';
+
+		if ( $multi ) {
+			$first = true;
+			foreach ( $a as $row ) {
+				if ( $first ) {
+					$first = false;
+				} else {
+					$sql .= ',';
+				}
+				$sql .= '(' . $this->makeList( $row ) . ')';
+			}
+		} else {
+			$sql .= '(' . $this->makeList( $a ) . ')';
+		}
+		return (bool)$this->query( $sql, $fname );
+	}
+
+	/**
+	 * Make UPDATE options for the Database::update function
+	 *
+	 * @private
+	 * @param array $options The options passed to Database::update
+	 * @return string
+	 */
+	function makeUpdateOptions( $options ) {
+		if( !is_array( $options ) ) {
+			$options = array( $options );
+		}
+		$opts = array();
+		if ( in_array( 'LOW_PRIORITY', $options ) )
+			$opts[] = $this->lowPriorityOption();
+		if ( in_array( 'IGNORE', $options ) )
+			$opts[] = 'IGNORE';
+		return implode(' ', $opts);
+	}
+
+	/**
+	 * UPDATE wrapper, takes a condition array and a SET array
+	 *
+	 * @param string $table  The table to UPDATE
+	 * @param array  $values An array of values to SET
+	 * @param array  $conds  An array of conditions (WHERE). Use '*' to update all rows.
+	 * @param string $fname  The Class::Function calling this function
+	 *                       (for the log)
+	 * @param array  $options An array of UPDATE options, can be one or
+	 *                        more of IGNORE, LOW_PRIORITY
+	 */
+	function update( $table, $values, $conds, $fname = 'Database::update', $options = array() ) {
+		$table = $this->tableName( $table );
+		$opts = $this->makeUpdateOptions( $options );
+		$sql = "UPDATE $opts $table SET " . $this->makeList( $values, LIST_SET );
+		if ( $conds != '*' ) {
+			$sql .= " WHERE " . $this->makeList( $conds, LIST_AND );
+		}
+		$this->query( $sql, $fname );
+	}
+
+	/**
+	 * Makes a wfStrencoded list from an array
+	 * $mode:
+	 *        LIST_COMMA         - comma separated, no field names
+	 *        LIST_AND           - ANDed WHERE clause (without the WHERE)
+	 *        LIST_OR            - ORed WHERE clause (without the WHERE)
+	 *        LIST_SET           - comma separated with field names, like a SET clause
+	 *        LIST_NAMES         - comma separated field names
+	 */
+	function makeList( $a, $mode = LIST_COMMA ) {
+		if ( !is_array( $a ) ) {
+			throw new DBUnexpectedError( $this, 'Database::makeList called with incorrect parameters' );
+		}
+
+		$first = true;
+		$list = '';
+		foreach ( $a as $field => $value ) {
+			if ( !$first ) {
+				if ( $mode == LIST_AND ) {
+					$list .= ' AND ';
+				} elseif($mode == LIST_OR) {
+					$list .= ' OR ';
+				} else {
+					$list .= ',';
+				}
+			} else {
+				$first = false;
+			}
+			if ( ($mode == LIST_AND || $mode == LIST_OR) && is_numeric( $field ) ) {
+				$list .= "($value)";
+			} elseif ( ($mode == LIST_AND || $mode == LIST_OR) && is_array ($value) ) {
+				$list .= $field." IN (".$this->makeList($value).") ";
+			} else {
+				if ( $mode == LIST_AND || $mode == LIST_OR || $mode == LIST_SET ) {
+					$list .= "$field = ";
+				}
+				$list .= $mode == LIST_NAMES ? $value : $this->addQuotes( $value );
+			}
+		}
+		return $list;
+	}
+
+	/**
+	 * Change the current database
+	 */
+	function selectDB( $db ) {
+		$this->mDBname = $db;
+		return mysql_select_db( $db, $this->mConn );
+	}
+
+	/**
+	 * Format a table name ready for use in constructing an SQL query
+	 *
+	 * This does two important things: it quotes table names which as necessary,
+	 * and it adds a table prefix if there is one.
+	 *
+	 * All functions of this object which require a table name call this function
+	 * themselves. Pass the canonical name to such functions. This is only needed
+	 * when calling query() directly.
+	 *
+	 * @param string $name database table name
+	 */
+	function tableName( $name ) {
+		global $wgSharedDB;
+		# Skip quoted literals
+		if ( $name{0} != '`' ) {
+			if ( $this->mTablePrefix !== '' &&  strpos( '.', $name ) === false ) {
+				$name = "{$this->mTablePrefix}$name";
+			}
+			if ( isset( $wgSharedDB ) && "{$this->mTablePrefix}user" == $name ) {
+				$name = "`$wgSharedDB`.`$name`";
+			} else {
+				# Standard quoting
+				$name = "`$name`";
+			}
+		}
+		return $name;
+	}
+
+	/**
+	 * Fetch a number of table names into an array
+	 * This is handy when you need to construct SQL for joins
+	 *
+	 * Example:
+	 * extract($dbr->tableNames('user','watchlist'));
+	 * $sql = "SELECT wl_namespace,wl_title FROM $watchlist,$user
+	 *         WHERE wl_user=user_id AND wl_user=$nameWithQuotes";
+	 */
+	function tableNames() {
+		$inArray = func_get_args();
+		$retVal = array();
+		foreach ( $inArray as $name ) {
+			$retVal[$name] = $this->tableName( $name );
+		}
+		return $retVal;
+	}
+
+	/**
+	 * @private
+	 */
+	function tableNamesWithUseIndex( $tables, $use_index ) {
+		$ret = array();
+
+		foreach ( $tables as $table )
+			if ( @$use_index[$table] !== null )
+				$ret[] = $this->tableName( $table ) . ' ' . $this->useIndexClause( implode( ',', (array)$use_index[$table] ) );
+			else
+				$ret[] = $this->tableName( $table );
+
+		return implode( ',', $ret );
+	}
+
+	/**
+	 * Wrapper for addslashes()
+	 * @param string $s String to be slashed.
+	 * @return string slashed string.
+	 */
+	function strencode( $s ) {
+		return mysql_real_escape_string( $s, $this->mConn );
+	}
+
+	/**
+	 * If it's a string, adds quotes and backslashes
+	 * Otherwise returns as-is
+	 */
+	function addQuotes( $s ) {
+		if ( is_null( $s ) ) {
+			return 'NULL';
+		} else {
+			# This will also quote numeric values. This should be harmless,
+			# and protects against weird problems that occur when they really
+			# _are_ strings such as article titles and string->number->string
+			# conversion is not 1:1.
+			return "'" . $this->strencode( $s ) . "'";
+		}
+	}
+
+	/**
+	 * Escape string for safe LIKE usage
+	 */
+	function escapeLike( $s ) {
+		$s=$this->strencode( $s );
+		$s=str_replace(array('%','_'),array('\%','\_'),$s);
+		return $s;
+	}
+
+	/**
+	 * Returns an appropriately quoted sequence value for inserting a new row.
+	 * MySQL has autoincrement fields, so this is just NULL. But the PostgreSQL
+	 * subclass will return an integer, and save the value for insertId()
+	 */
+	function nextSequenceValue( $seqName ) {
+		return NULL;
+	}
+
+	/**
+	 * USE INDEX clause
+	 * PostgreSQL doesn't have them and returns ""
+	 */
+	function useIndexClause( $index ) {
+		return "FORCE INDEX ($index)";
+	}
+
+	/**
+	 * REPLACE query wrapper
+	 * PostgreSQL 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
+	 *
+	 * @todo migrate comment to phodocumentor format
+	 */
+	function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
+		$table = $this->tableName( $table );
+
+		# Single row case
+		if ( !is_array( reset( $rows ) ) ) {
+			$rows = array( $rows );
+		}
+
+		$sql = "REPLACE INTO $table (" . implode( ',', array_keys( $rows[0] ) ) .') VALUES ';
+		$first = true;
+		foreach ( $rows as $row ) {
+			if ( $first ) {
+				$first = false;
+			} else {
+				$sql .= ',';
+			}
+			$sql .= '(' . $this->makeList( $row ) . ')';
+		}
+		return $this->query( $sql, $fname );
+	}
+
+	/**
+	 * DELETE where the condition is a join
+	 * MySQL does this with a multi-table DELETE syntax, PostgreSQL does it with sub-selects
+	 *
+	 * For safety, an empty $conds will not delete everything. If you want to delete all rows where the
+	 * join condition matches, set $conds='*'
+	 *
+	 * DO NOT put the join condition in $conds
+	 *
+	 * @param string $delTable The table to delete from.
+	 * @param string $joinTable The other table.
+	 * @param string $delVar The variable to join on, in the first table.
+	 * @param string $joinVar The variable to join on, in the second table.
+	 * @param array $conds Condition array of field names mapped to variables, ANDed together in the WHERE clause
+	 */
+	function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'Database::deleteJoin' ) {
+		if ( !$conds ) {
+			throw new DBUnexpectedError( $this, 'Database::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 );
+	}
+
+	/**
+	 * Returns the size of a text field, or -1 for "unlimited"
+	 */
+	function textFieldSize( $table, $field ) {
+		$table = $this->tableName( $table );
+		$sql = "SHOW COLUMNS FROM $table LIKE \"$field\";";
+		$res = $this->query( $sql, 'Database::textFieldSize' );
+		$row = $this->fetchObject( $res );
+		$this->freeResult( $res );
+
+		if ( preg_match( "/\((.*)\)/", $row->Type, $m ) ) {
+			$size = $m[1];
+		} else {
+			$size = -1;
+		}
+		return $size;
+	}
+
+	/**
+	 * @return string Returns the text of the low priority option if it is supported, or a blank string otherwise
+	 */
+	function lowPriorityOption() {
+		return 'LOW_PRIORITY';
+	}
+
+	/**
+	 * DELETE query wrapper
+	 *
+	 * Use $conds == "*" to delete all rows
+	 */
+	function delete( $table, $conds, $fname = 'Database::delete' ) {
+		if ( !$conds ) {
+			throw new DBUnexpectedError( $this, 'Database::delete() called with no conditions' );
+		}
+		$table = $this->tableName( $table );
+		$sql = "DELETE FROM $table";
+		if ( $conds != '*' ) {
+			$sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
+		}
+		return $this->query( $sql, $fname );
+	}
+
+	/**
+	 * INSERT SELECT wrapper
+	 * $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
+	 * Source items may be literals rather than 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.
+	 */
+	function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'Database::insertSelect',
+		$insertOptions = array(), $selectOptions = array() )
+	{
+		$destTable = $this->tableName( $destTable );
+		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 );
+		}
+		$sql = "INSERT $insertOptions INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
+			" SELECT $startOpts " . implode( ',', $varMap ) .
+			" FROM $srcTable $useIndex ";
+		if ( $conds != '*' ) {
+			$sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
+		}
+		$sql .= " $tailOpts";
+		return $this->query( $sql, $fname );
+	}
+
+	/**
+	 * Construct a LIMIT query with optional offset
+	 * This is used for query pages
+	 * $sql string SQL query we will append the limit too
+	 * $limit integer the SQL limit
+	 * $offset integer the SQL offset (default false)
+	 */
+	function limitResult($sql, $limit, $offset=false) {
+		if( !is_numeric($limit) ) {
+			throw new DBUnexpectedError( $this, "Invalid non-numeric limit passed to limitResult()\n" );
+		}
+		return " $sql LIMIT "
+				. ( (is_numeric($offset) && $offset != 0) ? "{$offset}," : "" )
+				. "{$limit} ";
+	}
+	function limitResultForUpdate($sql, $num) {
+		return $this->limitResult($sql, $num, 0);
+	}
+
+	/**
+	 * Returns an SQL expression for a simple conditional.
+	 * Uses IF on MySQL.
+	 *
+	 * @param string $cond SQL expression which will result in a boolean value
+	 * @param string $trueVal SQL expression to return if true
+	 * @param string $falseVal SQL expression to return if false
+	 * @return string SQL fragment
+	 */
+	function conditional( $cond, $trueVal, $falseVal ) {
+		return " IF($cond, $trueVal, $falseVal) ";
+	}
+
+	/**
+	 * Determines if the last failure was due to a deadlock
+	 */
+	function wasDeadlock() {
+		return $this->lastErrno() == 1213;
+	}
+
+	/**
+	 * Perform a deadlock-prone transaction.
+	 *
+	 * This function invokes a callback function to perform a set of write
+	 * queries. If a deadlock occurs during the processing, the transaction
+	 * will be rolled back and the callback function will be called again.
+	 *
+	 * Usage:
+	 *   $dbw->deadlockLoop( callback, ... );
+	 *
+	 * Extra arguments are passed through to the specified callback function.
+	 *
+	 * Returns whatever the callback function returned on its successful,
+	 * iteration, or false on error, for example if the retry limit was
+	 * reached.
+	 */
+	function deadlockLoop() {
+		$myFname = 'Database::deadlockLoop';
+
+		$this->begin();
+		$args = func_get_args();
+		$function = array_shift( $args );
+		$oldIgnore = $this->ignoreErrors( true );
+		$tries = DEADLOCK_TRIES;
+		if ( is_array( $function ) ) {
+			$fname = $function[0];
+		} else {
+			$fname = $function;
+		}
+		do {
+			$retVal = call_user_func_array( $function, $args );
+			$error = $this->lastError();
+			$errno = $this->lastErrno();
+			$sql = $this->lastQuery();
+
+			if ( $errno ) {
+				if ( $this->wasDeadlock() ) {
+					# Retry
+					usleep( mt_rand( DEADLOCK_DELAY_MIN, DEADLOCK_DELAY_MAX ) );
+				} else {
+					$this->reportQueryError( $error, $errno, $sql, $fname );
+				}
+			}
+		} while( $this->wasDeadlock() && --$tries > 0 );
+		$this->ignoreErrors( $oldIgnore );
+		if ( $tries <= 0 ) {
+			$this->query( 'ROLLBACK', $myFname );
+			$this->reportQueryError( $error, $errno, $sql, $fname );
+			return false;
+		} else {
+			$this->query( 'COMMIT', $myFname );
+			return $retVal;
+		}
+	}
+
+	/**
+	 * Do a SELECT MASTER_POS_WAIT()
+	 *
+	 * @param string $file the binlog file
+	 * @param string $pos the binlog position
+	 * @param integer $timeout the maximum number of seconds to wait for synchronisation
+	 */
+	function masterPosWait( $file, $pos, $timeout ) {
+		$fname = 'Database::masterPosWait';
+		wfProfileIn( $fname );
+
+
+		# Commit any open transactions
+		$this->immediateCommit();
+
+		# Call doQuery() directly, to avoid opening a transaction if DBO_TRX is set
+		$encFile = $this->strencode( $file );
+		$sql = "SELECT MASTER_POS_WAIT('$encFile', $pos, $timeout)";
+		$res = $this->doQuery( $sql );
+		if ( $res && $row = $this->fetchRow( $res ) ) {
+			$this->freeResult( $res );
+			wfProfileOut( $fname );
+			return $row[0];
+		} else {
+			wfProfileOut( $fname );
+			return false;
+		}
+	}
+
+	/**
+	 * Get the position of the master from SHOW SLAVE STATUS
+	 */
+	function getSlavePos() {
+		$res = $this->query( 'SHOW SLAVE STATUS', 'Database::getSlavePos' );
+		$row = $this->fetchObject( $res );
+		if ( $row ) {
+			return array( $row->Master_Log_File, $row->Read_Master_Log_Pos );
+		} else {
+			return array( false, false );
+		}
+	}
+
+	/**
+	 * Get the position of the master from SHOW MASTER STATUS
+	 */
+	function getMasterPos() {
+		$res = $this->query( 'SHOW MASTER STATUS', 'Database::getMasterPos' );
+		$row = $this->fetchObject( $res );
+		if ( $row ) {
+			return array( $row->File, $row->Position );
+		} else {
+			return array( false, false );
+		}
+	}
+
+	/**
+	 * Begin a transaction, committing any previously open transaction
+	 */
+	function begin( $fname = 'Database::begin' ) {
+		$this->query( 'BEGIN', $fname );
+		$this->mTrxLevel = 1;
+	}
+
+	/**
+	 * End a transaction
+	 */
+	function commit( $fname = 'Database::commit' ) {
+		$this->query( 'COMMIT', $fname );
+		$this->mTrxLevel = 0;
+	}
+
+	/**
+	 * Rollback a transaction
+	 */
+	function rollback( $fname = 'Database::rollback' ) {
+		$this->query( 'ROLLBACK', $fname );
+		$this->mTrxLevel = 0;
+	}
+
+	/**
+	 * Begin a transaction, committing any previously open transaction
+	 * @deprecated use begin()
+	 */
+	function immediateBegin( $fname = 'Database::immediateBegin' ) {
+		$this->begin();
+	}
+
+	/**
+	 * Commit transaction, if one is open
+	 * @deprecated use commit()
+	 */
+	function immediateCommit( $fname = 'Database::immediateCommit' ) {
+		$this->commit();
+	}
+
+	/**
+	 * Return MW-style timestamp used for MySQL schema
+	 */
+	function timestamp( $ts=0 ) {
+		return wfTimestamp(TS_MW,$ts);
+	}
+
+	/**
+	 * Local database timestamp format or null
+	 */
+	function timestampOrNull( $ts = null ) {
+		if( is_null( $ts ) ) {
+			return null;
+		} else {
+			return $this->timestamp( $ts );
+		}
+	}
+
+	/**
+	 * @todo document
+	 */
+	function resultObject( $result ) {
+		if( empty( $result ) ) {
+			return NULL;
+		} else {
+			return new ResultWrapper( $this, $result );
+		}
+	}
+
+	/**
+	 * Return aggregated value alias
+	 */
+	function aggregateValue ($valuedata,$valuename='value') {
+		return $valuename;
+	}
+
+	/**
+	 * @return string wikitext of a link to the server software's web site
+	 */
+	function getSoftwareLink() {
+		return "[http://www.mysql.com/ MySQL]";
+	}
+
+	/**
+	 * @return string Version information from the database
+	 */
+	function getServerVersion() {
+		return mysql_get_server_info();
+	}
+
+	/**
+	 * Ping the server and try to reconnect if it there is no connection
+	 */
+	function ping() {
+		if( function_exists( 'mysql_ping' ) ) {
+			return mysql_ping( $this->mConn );
+		} else {
+			wfDebug( "Tried to call mysql_ping but this is ancient PHP version. Faking it!\n" );
+			return true;
+		}
+	}
+
+	/**
+	 * Get slave lag.
+	 * At the moment, this will only work if the DB user has the PROCESS privilege
+	 */
+	function getLag() {
+		$res = $this->query( 'SHOW PROCESSLIST' );
+		# Find slave SQL thread. Assumed to be the second one running, which is a bit
+		# dubious, but unfortunately there's no easy rigorous way
+		$slaveThreads = 0;
+		while ( $row = $this->fetchObject( $res ) ) {
+			/* 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'
+				) {
+				# This is it, return the time (except -ve)
+				if ( $row->Time > 0x7fffffff ) {
+					return false;
+				} else {
+					return $row->Time;
+				}
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Get status information from SHOW STATUS in an associative array
+	 */
+	function getStatus($which="%") {
+		$res = $this->query( "SHOW STATUS LIKE '{$which}'" );
+		$status = array();
+		while ( $row = $this->fetchObject( $res ) ) {
+			$status[$row->Variable_name] = $row->Value;
+		}
+		return $status;
+	}
+
+	/**
+	 * Return the maximum number of items allowed in a list, or 0 for unlimited.
+	 */
+	function maxListLen() {
+		return 0;
+	}
+
+	function encodeBlob($b) {
+		return $b;
+	}
+
+	function decodeBlob($b) {
+		return $b;
+	}
+
+	/**
+	 * Read and execute SQL commands from a file.
+	 * Returns true on success, error string on failure
+	 */
+	function sourceFile( $filename ) {
+		$fp = fopen( $filename, 'r' );
+		if ( false === $fp ) {
+			return "Could not open \"{$fname}\".\n";
+		}
+
+		$cmd = "";
+		$done = false;
+		$dollarquote = false;
+
+		while ( ! feof( $fp ) ) {
+			$line = trim( fgets( $fp, 1024 ) );
+			$sl = strlen( $line ) - 1;
+
+			if ( $sl < 0 ) { continue; }
+			if ( '-' == $line{0} && '-' == $line{1} ) { continue; }
+
+			## Allow dollar quoting for function declarations
+			if (substr($line,0,4) == '$mw$') {
+				if ($dollarquote) {
+					$dollarquote = false;
+					$done = true;
+				}
+				else {
+					$dollarquote = true;
+				}
+			}
+			else if (!$dollarquote) {
+				if ( ';' == $line{$sl} && ($sl < 2 || ';' != $line{$sl - 1})) {
+					$done = true;
+					$line = substr( $line, 0, $sl );
+				}
+			}
+
+			if ( '' != $cmd ) { $cmd .= ' '; }
+			$cmd .= "$line\n";
+
+			if ( $done ) {
+				$cmd = str_replace(';;', ";", $cmd);
+				$cmd = $this->replaceVars( $cmd );
+				$res = $this->query( $cmd, 'dbsource', true );
+
+				if ( false === $res ) {
+					$err = $this->lastError();
+					return "Query \"{$cmd}\" failed with error code \"$err\".\n";
+				}
+
+				$cmd = '';
+				$done = false;
+			}
+		}
+		fclose( $fp );
+		return true;
+	}
+
+	/**
+	 * Replace variables in sourced SQL
+	 */
+	protected function replaceVars( $ins ) {
+		$varnames = array(
+			'wgDBserver', 'wgDBname', 'wgDBintlname', 'wgDBuser',
+			'wgDBpassword', 'wgDBsqluser', 'wgDBsqlpassword',
+			'wgDBadminuser', 'wgDBadminpassword',
+		);
+
+		// Ordinary variables
+		foreach ( $varnames as $var ) {
+			if( isset( $GLOBALS[$var] ) ) {
+				$val = addslashes( $GLOBALS[$var] ); // FIXME: safety check?
+				$ins = str_replace( '{$' . $var . '}', $val, $ins );
+				$ins = str_replace( '/*$' . $var . '*/`', '`' . $val, $ins );
+				$ins = str_replace( '/*$' . $var . '*/', $val, $ins );
+			}
+		}
+
+		// Table prefixes
+		$ins = preg_replace_callback( '/\/\*(?:\$wgDBprefix|_)\*\/([a-z_]*)/',
+			array( &$this, 'tableNameCallback' ), $ins );
+		return $ins;
+	}
+
+	/**
+	 * Table name callback
+	 * @private
+	 */
+	protected function tableNameCallback( $matches ) {
+		return $this->tableName( $matches[1] );
+	}
+
+}
+
+/**
+ * Database abstraction object for mySQL
+ * Inherit all methods and properties of Database::Database()
+ *
+ * @package MediaWiki
+ * @see Database
+ */
+class DatabaseMysql extends Database {
+	# Inherit all
+}
+
+
+/**
+ * Result wrapper for grabbing data queried by someone else
+ *
+ * @package MediaWiki
+ */
+class ResultWrapper {
+	var $db, $result;
+
+	/**
+	 * @todo document
+	 */
+	function ResultWrapper( &$database, $result ) {
+		$this->db =& $database;
+		$this->result =& $result;
+	}
+
+	/**
+	 * @todo document
+	 */
+	function numRows() {
+		return $this->db->numRows( $this->result );
+	}
+
+	/**
+	 * @todo document
+	 */
+	function fetchObject() {
+		return $this->db->fetchObject( $this->result );
+	}
+
+	/**
+	 * @todo document
+	 */
+	function fetchRow() {
+		return $this->db->fetchRow( $this->result );
+	}
+
+	/**
+	 * @todo document
+	 */
+	function free() {
+		$this->db->freeResult( $this->result );
+		unset( $this->result );
+		unset( $this->db );
+	}
+
+	function seek( $row ) {
+		$this->db->dataSeek( $this->result, $row );
+	}
+
+}
+
+?>