MediaWiki 1.7.1 wiederhergestellt

1 files changed, 609 insertions, 0 deletions

diff --git a/includes/DatabasePostgres.php b/includes/DatabasePostgres.php
new file mode 100644
index 00000000..5897386f
--- /dev/null
+++ b/includes/DatabasePostgres.php
@@ -0,0 +1,609 @@
+<?php
+
+/**
+ * This is PostgreSQL database abstraction layer.
+ *
+ * As it includes more generic version for DB functions,
+ * than MySQL ones, some of them should be moved to parent
+ * Database class.
+ *
+ * @package MediaWiki
+ */
+
+/**
+ * Depends on database
+ */
+require_once( 'Database.php' );
+
+class DatabasePostgres extends Database {
+	var $mInsertId = NULL;
+	var $mLastResult = NULL;
+
+	function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
+		$failFunction = false, $flags = 0 )
+	{
+
+		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;
+
+		$this->open( $server, $user, $password, $dbName);
+
+	}
+
+	static function newFromParams( $server = false, $user = false, $password = false, $dbName = false,
+		$failFunction = false, $flags = 0)
+	{
+		return new DatabasePostgres( $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 ) {
+		# Test for PostgreSQL support, to avoid suppressed fatal error
+		if ( !function_exists( 'pg_connect' ) ) {
+			throw new DBConnectionError( $this, "PostgreSQL functions missing, have you compiled PHP with the --with-pgsql option?\n" );
+		}
+
+		global $wgDBport;
+
+		$this->close();
+		$this->mServer = $server;
+		$port = $wgDBport;
+		$this->mUser = $user;
+		$this->mPassword = $password;
+		$this->mDBname = $dbName;
+
+		$success = false;
+
+		$hstring="";
+		if ($server!=false && $server!="") {
+			$hstring="host=$server ";
+		}
+		if ($port!=false && $port!="") {
+			$hstring .= "port=$port ";
+		}
+
+		error_reporting( E_ALL );
+
+		@$this->mConn = pg_connect("$hstring dbname=$dbName user=$user password=$password");
+
+		if ( $this->mConn == false ) {
+			wfDebug( "DB connection error\n" );
+			wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
+			wfDebug( $this->lastError()."\n" );
+			return false;
+		}
+
+		$this->mOpened = true;
+		## If this is the initial connection, setup the schema stuff
+		if (defined('MEDIAWIKI_INSTALL') and !defined('POSTGRES_SEARCHPATH')) {
+			global $wgDBmwschema, $wgDBts2schema, $wgDBname;
+
+			## Do we have the basic tsearch2 table?
+			print "<li>Checking for tsearch2 ...";
+			if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
+				print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
+				print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
+				print " for instructions.</li>\n";
+				dieout("</ul>");
+			}				
+			print "OK</li>\n";
+
+			## Do we have plpgsql installed?
+			print "<li>Checking for plpgsql ...";
+			$SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
+			$res = $this->doQuery($SQL);
+			$rows = $this->numRows($this->doQuery($SQL));
+			if ($rows < 1) {
+				print "<b>FAILED</b>. Make sure the language plpgsql is installed for the database <tt>$wgDBname</tt>t</li>";
+				## XXX Better help
+				dieout("</ul>");
+			}
+			print "OK</li>\n";
+
+			## Does the schema already exist? Who owns it?
+			$result = $this->schemaExists($wgDBmwschema);
+			if (!$result) {
+				print "<li>Creating schema <b>$wgDBmwschema</b> ...";
+				$result = $this->doQuery("CREATE SCHEMA $wgDBmwschema");
+				if (!$result) {
+					print "FAILED.</li>\n";
+					return false;
+				}
+				print "ok</li>\n";
+			}
+			else if ($result != $user) {
+				print "<li>Schema <b>$wgDBmwschema</b> exists but is not owned by <b>$user</b>. Not ideal.</li>\n";
+			}
+			else {
+				print "<li>Schema <b>$wgDBmwschema</b> exists and is owned by <b>$user ($result)</b>. Excellent.</li>\n";
+			}
+
+			## Fix up the search paths if needed
+			print "<li>Setting the search path for user <b>$user</b> ...";
+			$path = "$wgDBmwschema";
+			if ($wgDBts2schema !== $wgDBmwschema)
+				$path .= ", $wgDBts2schema";
+			if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
+				$path .= ", public";
+			$SQL = "ALTER USER $user SET search_path = $path";
+			$result = pg_query($this->mConn, $SQL);
+			if (!$result) {
+				print "FAILED.</li>\n";
+				return false;
+			}
+			print "ok</li>\n";
+			## Set for the rest of this session
+			$SQL = "SET search_path = $path";
+			$result = pg_query($this->mConn, $SQL);
+			if (!$result) {
+				print "<li>Failed to set search_path</li>\n";
+				return false;
+			}
+			define( "POSTGRES_SEARCHPATH", $path );
+		}
+
+		return $this->mConn;
+	}
+
+	/**
+	 * Closes a database connection, if it is open
+	 * Returns success, true if already closed
+	 */
+	function close() {
+		$this->mOpened = false;
+		if ( $this->mConn ) {
+			return pg_close( $this->mConn );
+		} else {
+			return true;
+		}
+	}
+
+	function doQuery( $sql ) {
+		return $this->mLastResult=pg_query( $this->mConn , $sql);
+	}
+
+	function queryIgnore( $sql, $fname = '' ) {
+		return $this->query( $sql, $fname, true );
+	}
+
+	function freeResult( $res ) {
+		if ( !@pg_free_result( $res ) ) {
+			throw new DBUnexpectedError($this,  "Unable to free PostgreSQL result\n" );
+		}
+	}
+
+	function fetchObject( $res ) {
+		@$row = pg_fetch_object( $res );
+		# FIXME: HACK HACK HACK HACK debug
+
+		# TODO:
+		# hashar : not sure if the following test really trigger if the object
+		#          fetching failled.
+		if( pg_last_error($this->mConn) ) {
+			throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
+		}
+		return $row;
+	}
+
+	function fetchRow( $res ) {
+		@$row = pg_fetch_array( $res );
+		if( pg_last_error($this->mConn) ) {
+			throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
+		}
+		return $row;
+	}
+
+	function numRows( $res ) {
+		@$n = pg_num_rows( $res );
+		if( pg_last_error($this->mConn) ) {
+			throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
+		}
+		return $n;
+	}
+	function numFields( $res ) { return pg_num_fields( $res ); }
+	function fieldName( $res, $n ) { return pg_field_name( $res, $n ); }
+
+	/**
+	 * This must be called after nextSequenceVal
+	 */
+	function insertId() {
+		return $this->mInsertId;
+	}
+
+	function dataSeek( $res, $row ) { return pg_result_seek( $res, $row ); }
+	function lastError() {
+		if ( $this->mConn ) {
+			return pg_last_error();
+		}
+		else {
+			return "No database connection";
+		}
+	}
+	function lastErrno() { return 1; }
+
+	function affectedRows() {
+		return pg_affected_rows( $this->mLastResult );
+	}
+
+	/**
+	 * Returns information about an index
+	 * If errors are explicitly ignored, returns NULL on failure
+	 */
+	function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
+		$sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
+		$res = $this->query( $sql, $fname );
+		if ( !$res ) {
+			return NULL;
+		}
+
+		while ( $row = $this->fetchObject( $res ) ) {
+			if ( $row->indexname == $index ) {
+				return $row;
+			}
+		}
+		return false;
+	}
+
+	function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
+		$sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
+			" AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
+		$res = $this->query( $sql, $fname );
+		if ( !$res )
+			return NULL;
+		while ($row = $this->fetchObject( $res ))
+			return true;
+		return false;
+
+	}
+
+	function insert( $table, $a, $fname = 'Database::insert', $options = array() ) {
+		# PostgreSQL doesn't support options
+		# We have a go at faking one of them
+		# TODO: DELAYED, LOW_PRIORITY
+
+		if ( !is_array($options))
+			$options = array($options);
+
+		if ( in_array( 'IGNORE', $options ) )
+			$oldIgnore = $this->ignoreErrors( true );
+
+		# IGNORE is performed using single-row inserts, ignoring errors in each
+		# FIXME: need some way to distiguish between key collision and other types of error
+		$oldIgnore = $this->ignoreErrors( true );
+		if ( !is_array( reset( $a ) ) ) {
+			$a = array( $a );
+		}
+		foreach ( $a as $row ) {
+			parent::insert( $table, $row, $fname, array() );
+		}
+		$this->ignoreErrors( $oldIgnore );
+		$retVal = true;
+
+		if ( in_array( 'IGNORE', $options ) )
+			$this->ignoreErrors( $oldIgnore );
+
+		return $retVal;
+	}
+
+	function tableName( $name ) {
+		# Replace backticks into double quotes
+		$name = strtr($name,'`','"');
+
+		# Now quote PG reserved keywords
+		switch( $name ) {
+			case 'user':
+			case 'old':
+			case 'group':
+				return '"' . $name . '"';
+
+			default:
+				return $name;
+		}
+	}
+
+	/**
+	 * Return the next in a sequence, save the value for retrieval via insertId()
+	 */
+	function nextSequenceValue( $seqName ) {
+		$safeseq = preg_replace( "/'/", "''", $seqName );
+		$res = $this->query( "SELECT nextval('$safeseq')" );
+		$row = $this->fetchRow( $res );
+		$this->mInsertId = $row[0];
+		$this->freeResult( $res );
+		return $this->mInsertId;
+	}
+
+	/**
+	 * USE INDEX clause
+	 * PostgreSQL doesn't have them and returns ""
+	 */
+	function useIndexClause( $index ) {
+		return '';
+	}
+
+	# 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
+	function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
+		$table = $this->tableName( $table );
+
+		if (count($rows)==0) {
+			return;
+		}
+
+		# Single row case
+		if ( !is_array( reset( $rows ) ) ) {
+			$rows = array( $rows );
+		}
+
+		foreach( $rows as $row ) {
+			# Delete rows which collide
+			if ( $uniqueIndexes ) {
+				$sql = "DELETE FROM $table WHERE ";
+				$first = true;
+				foreach ( $uniqueIndexes as $index ) {
+					if ( $first ) {
+						$first = false;
+						$sql .= "(";
+					} else {
+						$sql .= ') OR (';
+					}
+					if ( is_array( $index ) ) {
+						$first2 = true;
+						foreach ( $index as $col ) {
+							if ( $first2 ) {
+								$first2 = false;
+							} else {
+								$sql .= ' AND ';
+							}
+							$sql .= $col.'=' . $this->addQuotes( $row[$col] );
+						}
+					} else {
+						$sql .= $index.'=' . $this->addQuotes( $row[$index] );
+					}
+				}
+				$sql .= ')';
+				$this->query( $sql, $fname );
+			}
+
+			# Now insert the row
+			$sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
+				$this->makeList( $row, LIST_COMMA ) . ')';
+			$this->query( $sql, $fname );
+		}
+	}
+
+	# DELETE where the condition is a join
+	function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
+		if ( !$conds ) {
+			throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
+		}
+
+		$delTable = $this->tableName( $delTable );
+		$joinTable = $this->tableName( $joinTable );
+		$sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
+		if ( $conds != '*' ) {
+			$sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
+		}
+		$sql .= ')';
+
+		$this->query( $sql, $fname );
+	}
+
+	# Returns the size of a text field, or -1 for "unlimited"
+	function textFieldSize( $table, $field ) {
+		$table = $this->tableName( $table );
+		$sql = "SELECT t.typname as ftype,a.atttypmod as size
+			FROM pg_class c, pg_attribute a, pg_type t
+			WHERE relname='$table' AND a.attrelid=c.oid AND
+				a.atttypid=t.oid and a.attname='$field'";
+		$res =$this->query($sql);
+		$row=$this->fetchObject($res);
+		if ($row->ftype=="varchar") {
+			$size=$row->size-4;
+		} else {
+			$size=$row->size;
+		}
+		$this->freeResult( $res );
+		return $size;
+	}
+
+	function lowPriorityOption() {
+		return '';
+	}
+
+	function limitResult($sql, $limit,$offset) {
+		return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
+	}
+
+	/**
+	 * Returns an SQL expression for a simple conditional.
+	 * Uses CASE on PostgreSQL.
+	 *
+	 * @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 " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
+	}
+
+	# FIXME: actually detecting deadlocks might be nice
+	function wasDeadlock() {
+		return false;
+	}
+
+	# Return DB-style timestamp used for MySQL schema
+	function timestamp( $ts=0 ) {
+		return wfTimestamp(TS_DB,$ts);
+	}
+
+	/**
+	 * Return aggregated value function call
+	 */
+	function aggregateValue ($valuedata,$valuename='value') {
+		return $valuedata;
+	}
+
+
+	function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
+		$message = "A database error has occurred\n" .
+			"Query: $sql\n" .
+			"Function: $fname\n" .
+			"Error: $errno $error\n";
+		throw new DBUnexpectedError($this, $message);
+	}
+
+	/**
+	 * @return string wikitext of a link to the server software's web site
+	 */
+	function getSoftwareLink() {
+		return "[http://www.postgresql.org/ PostgreSQL]";
+	}
+
+	/**
+	 * @return string Version information from the database
+	 */
+	function getServerVersion() {
+		$res = $this->query( "SELECT version()" );
+		$row = $this->fetchRow( $res );
+		$version = $row[0];
+		$this->freeResult( $res );
+		return $version;
+	}
+
+
+	/**
+	 * Query whether a given table exists (in the given schema, or the default mw one if not given)
+	 */
+	function tableExists( $table, $schema = false ) {
+		global $wgDBmwschema;
+		if (! $schema )
+			$schema = $wgDBmwschema;
+		$etable = preg_replace("/'/", "''", $table);
+		$eschema = preg_replace("/'/", "''", $schema);
+		$SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
+			. "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema'";
+		$res = $this->query( $SQL );
+		$count = $res ? pg_num_rows($res) : 0;
+		if ($res)
+			$this->freeResult( $res );
+		return $count;
+	}
+
+
+	/**
+	 * Query whether a given schema exists. Returns the name of the owner
+	 */
+	function schemaExists( $schema ) {
+		$eschema = preg_replace("/'/", "''", $schema);
+		$SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
+				."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
+		$res = $this->query( $SQL );
+		$owner = $res ? pg_num_rows($res) ? pg_fetch_result($res, 0, 0) : false : false;
+		if ($res)
+			$this->freeResult($res);
+		return $owner;
+	}
+
+	/**
+	 * Query whether a given column exists in the mediawiki schema
+	 */
+	function fieldExists( $table, $field ) {
+		global $wgDBmwschema;
+		$etable = preg_replace("/'/", "''", $table);
+		$eschema = preg_replace("/'/", "''", $wgDBmwschema);
+		$ecol = preg_replace("/'/", "''", $field);
+		$SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
+			. "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
+			. "AND a.attrelid = c.oid AND a.attname = '$ecol'";
+		$res = $this->query( $SQL );
+		$count = $res ? pg_num_rows($res) : 0;
+		if ($res)
+			$this->freeResult( $res );
+		return $count;
+	}
+
+	function fieldInfo( $table, $field ) {
+		$res = $this->query( "SELECT $field FROM $table LIMIT 1" );
+		$type = pg_field_type( $res, 0 );
+		return $type;
+	}
+
+	function begin( $fname = 'DatabasePostgrs::begin' ) {
+		$this->query( 'BEGIN', $fname );
+		$this->mTrxLevel = 1;
+	}
+	function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
+		return true;
+	}
+	function commit( $fname = 'DatabasePostgres::commit' ) {
+		$this->query( 'COMMIT', $fname );
+		$this->mTrxLevel = 0;
+	}
+
+	/* Not even sure why this is used in the main codebase... */
+	function limitResultForUpdate($sql, $num) {
+		return $sql;
+	}
+
+	function update_interwiki() {
+		## Avoid the non-standard "REPLACE INTO" syntax
+		## Called by config/index.php
+		$f = fopen( "../maintenance/interwiki.sql", 'r' );
+		if ($f == false ) {
+			dieout( "<li>Could not find the interwiki.sql file");
+		}
+		## We simply assume it is already empty as we have just created it
+		$SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
+		while ( ! feof( $f ) ) {
+			$line = fgets($f,1024);
+			if (!preg_match("/^\s*(\(.+?),(\d)\)/", $line, $matches)) {
+				continue;
+			}
+			$yesno = $matches[2]; ## ? "'true'" : "'false'";
+			$this->query("$SQL $matches[1],$matches[2])");
+		}
+		print " (table interwiki successfully populated)...\n";
+	}
+
+	function encodeBlob($b) {
+		return array('bytea',pg_escape_bytea($b));
+	}
+	function decodeBlob($b) {
+		return pg_unescape_bytea( $b );
+	}
+
+	function strencode( $s ) { ## Should not be called by us
+		return pg_escape_string( $s );
+	}
+
+	function addQuotes( $s ) {
+		if ( is_null( $s ) ) {
+			return 'NULL';
+		} else if (is_array( $s )) { ## Assume it is bytea data
+			return "E'$s[1]'";
+		}
+		return "'" . pg_escape_string($s) . "'";
+		return "E'" . pg_escape_string($s) . "'";
+	}
+
+}
+
+?>