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authorPierre Schmitz <pierre@archlinux.de>2006-10-11 18:12:39 +0000
committerPierre Schmitz <pierre@archlinux.de>2006-10-11 18:12:39 +0000
commit183851b06bd6c52f3cae5375f433da720d410447 (patch)
treea477257decbf3360127f6739c2f9d0ec57a03d39 /includes/Database.php
MediaWiki 1.7.1 wiederhergestellt
Diffstat (limited to 'includes/Database.php')
-rw-r--r--includes/Database.php2020
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 );
+ }
+
+}
+
+?>