From 9db190c7e736ec8d063187d4241b59feaf7dc2d1 Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Wed, 22 Jun 2011 11:28:20 +0200
Subject: update to MediaWiki 1.17.0

---
 includes/db/DatabasePostgres.php | 922 ++++++++++-----------------------------
 1 file changed, 228 insertions(+), 694 deletions(-)

(limited to 'includes/db/DatabasePostgres.php')

diff --git a/includes/db/DatabasePostgres.php b/includes/db/DatabasePostgres.php
index 9072a5b2..bc71a9a5 100644
--- a/includes/db/DatabasePostgres.php
+++ b/includes/db/DatabasePostgres.php
@@ -1,46 +1,59 @@
 <?php
 /**
- * @ingroup Database
- * @file
  * This is the Postgres database abstraction layer.
  *
+ * @file
+ * @ingroup Database
  */
-class PostgresField {
-	private $name, $tablename, $type, $nullable, $max_length;
+
+class PostgresField implements Field {
+	private $name, $tablename, $type, $nullable, $max_length, $deferred, $deferrable, $conname;
 
 	static function fromText($db, $table, $field) {
 	global $wgDBmwschema;
 
 		$q = <<<SQL
 SELECT
-CASE WHEN typname = 'int2' THEN 'smallint'
-WHEN typname = 'int4' THEN 'integer'
-WHEN typname = 'int8' THEN 'bigint'
-WHEN typname = 'bpchar' THEN 'char'
-ELSE typname END AS typname,
-attnotnull, attlen
-FROM pg_class, pg_namespace, pg_attribute, pg_type
-WHERE relnamespace=pg_namespace.oid
-AND relkind='r'
-AND attrelid=pg_class.oid
-AND atttypid=pg_type.oid
+ attnotnull, attlen, COALESCE(conname, '') AS conname,
+ COALESCE(condeferred, 'f') AS deferred,
+ COALESCE(condeferrable, 'f') AS deferrable,
+ CASE WHEN typname = 'int2' THEN 'smallint'
+  WHEN typname = 'int4' THEN 'integer'
+  WHEN typname = 'int8' THEN 'bigint'
+  WHEN typname = 'bpchar' THEN 'char'
+ ELSE typname END AS typname
+FROM pg_class c
+JOIN pg_namespace n ON (n.oid = c.relnamespace)
+JOIN pg_attribute a ON (a.attrelid = c.oid)
+JOIN pg_type t ON (t.oid = a.atttypid)
+LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
+WHERE relkind = 'r'
 AND nspname=%s
 AND relname=%s
 AND attname=%s;
 SQL;
-		$res = $db->query(sprintf($q,
-				$db->addQuotes($wgDBmwschema),
-				$db->addQuotes($table),
-				$db->addQuotes($field)));
-		$row = $db->fetchObject($res);
-		if (!$row)
+
+		$table = $db->tableName( $table );
+		$res = $db->query(
+			sprintf( $q,
+				$db->addQuotes( $wgDBmwschema ),
+				$db->addQuotes( $table ),
+				$db->addQuotes( $field )
+			)
+		);
+		$row = $db->fetchObject( $res );
+		if ( !$row ) {
 			return null;
+		}
 		$n = new PostgresField;
 		$n->type = $row->typname;
-		$n->nullable = ($row->attnotnull == 'f');
+		$n->nullable = ( $row->attnotnull == 'f' );
 		$n->name = $field;
 		$n->tablename = $table;
 		$n->max_length = $row->attlen;
+		$n->deferrable = ( $row->deferrable == 't' );
+		$n->deferred = ( $row->deferred == 't' );
+		$n->conname = $row->conname;
 		return $n;
 	}
 
@@ -56,13 +69,26 @@ SQL;
 		return $this->type;
 	}
 
-	function nullable() {
+	function isNullable() {
 		return $this->nullable;
 	}
 
 	function maxLength() {
 		return $this->max_length;
 	}
+
+	function is_deferrable() {
+		return $this->deferrable;
+	}
+
+	function is_deferred() {
+		return $this->deferred;
+	}
+
+	function conname() {
+		return $this->conname;
+	}
+
 }
 
 /**
@@ -74,16 +100,6 @@ class DatabasePostgres extends DatabaseBase {
 	var $numeric_version = null;
 	var $mAffectedRows = null;
 
-	function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
-		$failFunction = false, $flags = 0 )
-	{
-
-		$this->mFailFunction = $failFunction;
-		$this->mFlags = $flags;
-		$this->open( $server, $user, $password, $dbName);
-
-	}
-
 	function getType() {
 		return 'postgres';
 	}
@@ -115,18 +131,18 @@ class DatabasePostgres extends DatabaseBase {
 
 	function hasConstraint( $name ) {
 		global $wgDBmwschema;
-		$SQL = "SELECT 1 FROM pg_catalog.pg_constraint c, pg_catalog.pg_namespace n WHERE c.connamespace = n.oid AND conname = '" . pg_escape_string( $name ) . "' AND n.nspname = '" . pg_escape_string($wgDBmwschema) ."'";
-		return $this->numRows($res = $this->doQuery($SQL));
+		$SQL = "SELECT 1 FROM pg_catalog.pg_constraint c, pg_catalog.pg_namespace n WHERE c.connamespace = n.oid AND conname = '" .
+				pg_escape_string( $this->mConn, $name ) . "' AND n.nspname = '" . pg_escape_string( $this->mConn, $wgDBmwschema ) ."'";
+		$res = $this->doQuery( $SQL );
+		return $this->numRows( $res );
 	}
 
-	static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
-	{
-		return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
+	static function newFromParams( $server, $user, $password, $dbName, $flags = 0 ) {
+		return new DatabasePostgres( $server, $user, $password, $dbName, $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 Postgres support, to avoid suppressed fatal error
@@ -136,7 +152,7 @@ class DatabasePostgres extends DatabaseBase {
 
 		global $wgDBport;
 
-		if (!strlen($user)) { ## e.g. the class is being loaded
+		if ( !strlen( $user ) ) { # e.g. the class is being loaded
 			return;
 		}
 		$this->close();
@@ -149,11 +165,12 @@ class DatabasePostgres extends DatabaseBase {
 		$connectVars = array(
 			'dbname' => $dbName,
 			'user' => $user,
-			'password' => $password );
-		if ($server!=false && $server!="") {
+			'password' => $password
+		);
+		if ( $server != false && $server != '' ) {
 			$connectVars['host'] = $server;
 		}
-		if ($port!=false && $port!="") {
+		if ( $port != false && $port != '' ) {
 			$connectVars['port'] = $port;
 		}
 		$connectString = $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW );
@@ -162,35 +179,30 @@ class DatabasePostgres extends DatabaseBase {
 		$this->mConn = pg_connect( $connectString );
 		$phpError = $this->restoreErrorHandler();
 
-		if ( $this->mConn == false ) {
+		if ( !$this->mConn ) {
 			wfDebug( "DB connection error\n" );
 			wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
-			wfDebug( $this->lastError()."\n" );
-			if ( !$this->mFailFunction ) {
-				throw new DBConnectionError( $this, $phpError );
-			} else {
-				return false;
-			}
+			wfDebug( $this->lastError() . "\n" );
+			throw new DBConnectionError( $this, str_replace( "\n", ' ', $phpError ) );
 		}
 
 		$this->mOpened = true;
 
 		global $wgCommandLineMode;
-		## If called from the command-line (e.g. importDump), only show errors
-		if ($wgCommandLineMode) {
+		# If called from the command-line (e.g. importDump), only show errors
+		if ( $wgCommandLineMode ) {
 			$this->doQuery( "SET client_min_messages = 'ERROR'" );
 		}
 
 		$this->doQuery( "SET client_encoding='UTF8'" );
 
 		global $wgDBmwschema, $wgDBts2schema;
-		if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
+		if ( isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 			&& $wgDBmwschema !== 'mediawiki'
 			&& preg_match( '/^\w+$/', $wgDBmwschema )
 			&& preg_match( '/^\w+$/', $wgDBts2schema )
 		) {
-			$safeschema = $this->quote_ident($wgDBmwschema);
-			$safeschema2 = $this->quote_ident($wgDBts2schema);
+			$safeschema = $this->addIdentifierQuotes( $wgDBmwschema );
 			$this->doQuery( "SET search_path = $safeschema, $wgDBts2schema, public" );
 		}
 
@@ -205,365 +217,6 @@ class DatabasePostgres extends DatabaseBase {
 		return $s;
 	}
 
-
-	function initial_setup($password, $dbName) {
-		// If this is the initial connection, setup the schema stuff and possibly create the user
-		global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema, $wgDBts2schema;
-
-		print "<li>Checking the version of Postgres...";
-		$version = $this->getServerVersion();
-		$PGMINVER = '8.1';
-		if ($version < $PGMINVER) {
-			print "<b>FAILED</b>. Required version is $PGMINVER. You have " . htmlspecialchars( $version ) . "</li>\n";
-			dieout("</ul>");
-		}
-		print "version " . htmlspecialchars( $this->numeric_version ) . " is OK.</li>\n";
-
-		$safeuser = $this->quote_ident($wgDBuser);
-		// Are we connecting as a superuser for the first time?
-		if ($wgDBsuperuser) {
-			// Are we really a superuser? Check out our rights
-			$SQL = "SELECT
-                      CASE WHEN usesuper IS TRUE THEN
-                      CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
-                      ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
-                    END AS rights
-                    FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
-			$rows = $this->numRows($res = $this->doQuery($SQL));
-			if (!$rows) {
-				print "<li>ERROR: Could not read permissions for user \"" . htmlspecialchars( $wgDBsuperuser ) . "\"</li>\n";
-				dieout('</ul>');
-			}
-			$perms = pg_fetch_result($res, 0, 0);
-
-			$SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
-			$rows = $this->numRows($this->doQuery($SQL));
-			if ($rows) {
-				print "<li>User \"" . htmlspecialchars( $wgDBuser ) . "\" already exists, skipping account creation.</li>";
-			}
-			else {
-				if ($perms != 1 and $perms != 3) {
-					print "<li>ERROR: the user \"" . htmlspecialchars( $wgDBsuperuser ) . "\" cannot create other users. ";
-					print 'Please use a different Postgres user.</li>';
-					dieout('</ul>');
-				}
-				print "<li>Creating user <b>" . htmlspecialchars( $wgDBuser ) . "</b>...";
-				$safepass = $this->addQuotes($wgDBpassword);
-				$SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
-				$this->doQuery($SQL);
-				print "OK</li>\n";
-			}
-			// User now exists, check out the database
-			if ($dbName != $wgDBname) {
-				$SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
-				$rows = $this->numRows($this->doQuery($SQL));
-				if ($rows) {
-					print "<li>Database \"" . htmlspecialchars( $wgDBname ) . "\" already exists, skipping database creation.</li>";
-				}
-				else {
-					if ($perms < 1) {
-						print "<li>ERROR: the user \"" . htmlspecialchars( $wgDBsuperuser ) . "\" cannot create databases. ";
-						print 'Please use a different Postgres user.</li>';
-						dieout('</ul>');
-					}
-					print "<li>Creating database <b>" . htmlspecialchars( $wgDBname ) . "</b>...";
-					$safename = $this->quote_ident($wgDBname);
-					$SQL = "CREATE DATABASE $safename OWNER $safeuser ";
-					$this->doQuery($SQL);
-					print "OK</li>\n";
-					// Hopefully tsearch2 and plpgsql are in template1...
-				}
-
-				// Reconnect to check out tsearch2 rights for this user
-				print "<li>Connecting to \"" . htmlspecialchars( $wgDBname ) . "\" as superuser \"" .
-					htmlspecialchars( $wgDBsuperuser ) . "\" to check rights...";
-
-				$connectVars = array();
-				if ($this->mServer!=false && $this->mServer!="") {
-					$connectVars['host'] = $this->mServer;
-				}
-				if ($this->mPort!=false && $this->mPort!="") {
-					$connectVars['port'] = $this->mPort;
-				}
-				$connectVars['dbname'] = $wgDBname;
-				$connectVars['user'] = $wgDBsuperuser;
-				$connectVars['password'] = $password;
-
-				@$this->mConn = pg_connect( $this->makeConnectionString( $connectVars ) );
-				if ( $this->mConn == false ) {
-					print "<b>FAILED TO CONNECT!</b></li>";
-					dieout("</ul>");
-				}
-				print "OK</li>\n";
-			}
-
-			if ($this->numeric_version < 8.3) {
-				// Tsearch2 checks
-				print "<li>Checking that tsearch2 is installed in the database \"" . 
-					htmlspecialchars( $wgDBname ) . "\"...";
-				if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
-					print "<b>FAILED</b>. tsearch2 must be installed in the database \"" . 
-						htmlspecialchars( $wgDBname ) . "\".";
-					print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
-					print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
-					dieout("</ul>");
-				}
-				print "OK</li>\n";
-				print "<li>Ensuring that user \"" . htmlspecialchars( $wgDBuser ) . 
-					"\" has select rights on the tsearch2 tables...";
-				foreach (array('cfg','cfgmap','dict','parser') as $table) {
-					$SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
-					$this->doQuery($SQL);
-				}
-				print "OK</li>\n";
-			}
-
-			// Setup the schema for this user if needed
-			$result = $this->schemaExists($wgDBmwschema);
-			$safeschema = $this->quote_ident($wgDBmwschema);
-			if (!$result) {
-				print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
-				$result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
-				if (!$result) {
-					print "<b>FAILED</b>.</li>\n";
-					dieout("</ul>");
-				}
-				print "OK</li>\n";
-			}
-			else {
-				print "<li>Schema already exists, explicitly granting rights...\n";
-				$safeschema2 = $this->addQuotes($wgDBmwschema);
-				$SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
-					"FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
-					"WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
-					"AND p.relkind IN ('r','S','v')\n";
-				$SQL .= "UNION\n";
-				$SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
-					"pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
-					"FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
-					"WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
-				$res = $this->doQuery($SQL);
-				if (!$res) {
-					print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
-					dieout("</ul>");
-				}
-				$this->doQuery("SET search_path = $safeschema");
-				$rows = $this->numRows($res);
-				while ($rows) {
-					$rows--;
-					$this->doQuery(pg_fetch_result($res, $rows, 0));
-				}
-				print "OK</li>";
-			}
-
-			// Install plpgsql if needed
-			$this->setup_plpgsql();
-
-			$wgDBsuperuser = '';
-			return true; // Reconnect as regular user
-
-		} // end superuser
-
-		if (!defined('POSTGRES_SEARCHPATH')) {
-
-			if ($this->numeric_version < 8.3) {
-				// Do we have the basic tsearch2 table?
-				print "<li>Checking for tsearch2 in the schema \"" . htmlspecialchars( $wgDBts2schema ) . "\"...";
-				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";
-
-				// Does this user have the rights to the tsearch2 tables?
-				$ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
-				print "<li>Checking tsearch2 permissions...";
-				// Let's check all four, just to be safe
-				error_reporting( 0 );
-				$ts2tables = array('cfg','cfgmap','dict','parser');
-				$safetsschema = $this->quote_ident($wgDBts2schema);
-				foreach ( $ts2tables AS $tname ) {
-					$SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
-					$res = $this->doQuery($SQL);
-					if (!$res) {
-						print "<b>FAILED</b> to access " . htmlspecialchars( "pg_ts_$tname" ) . 
-							". Make sure that the user \"". htmlspecialchars( $wgDBuser ) . 
-							"\" has SELECT access to all four tsearch2 tables</li>\n";
-						dieout("</ul>");
-					}
-				}
-				$SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = " . $this->addQuotes( $ctype ) ;
-				$SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
-				$res = $this->doQuery($SQL);
-				error_reporting( E_ALL );
-				if (!$res) {
-					print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
-					dieout("</ul>");
-				}
-				print "OK</li>";
-
-				// Will the current locale work? Can we force it to?
-				print "<li>Verifying tsearch2 locale with " . htmlspecialchars( $ctype ) . "...";
-				$rows = $this->numRows($res);
-				$resetlocale = 0;
-				if (!$rows) {
-					print "<b>not found</b></li>\n";
-					print "<li>Attempting to set default tsearch2 locale to \"" . htmlspecialchars( $ctype ) . "\"...";
-					$resetlocale = 1;
-				}
-				else {
-					$tsname = pg_fetch_result($res, 0, 0);
-					if ($tsname != 'default') {
-						print "<b>not set to default (" . htmlspecialchars( $tsname ) . ")</b>";
-						print "<li>Attempting to change tsearch2 default locale to \"" . 
-							htmlspecialchars( $ctype ) . "\"...";
-						$resetlocale = 1;
-					}
-				}
-				if ($resetlocale) {
-					$SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = " . $this->addQuotes( $ctype ) . " WHERE ts_name = 'default'";
-					$res = $this->doQuery($SQL);
-					if (!$res) {
-						print "<b>FAILED</b>. ";
-						print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"" . 
-							htmlspecialchars( $ctype ) . "\"</li>\n";
-						dieout("</ul>");
-					}
-					print "OK</li>";
-				}
-
-				// Final test: try out a simple tsearch2 query
-				$SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
-				$res = $this->doQuery($SQL);
-				if (!$res) {
-					print "<b>FAILED</b>. Specifically, \"" . htmlspecialchars( $SQL ) . "\" did not work.</li>";
-					dieout("</ul>");
-				}
-				print "OK</li>";
-			}
-
-			// Install plpgsql if needed
-			$this->setup_plpgsql();
-
-			// Does the schema already exist? Who owns it?
-			$result = $this->schemaExists($wgDBmwschema);
-			if (!$result) {
-				print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
-				error_reporting( 0 );
-				$safeschema = $this->quote_ident($wgDBmwschema);
-				$result = $this->doQuery("CREATE SCHEMA $safeschema");
-				error_reporting( E_ALL );
-				if (!$result) {
-					print "<b>FAILED</b>. The user \"" . htmlspecialchars( $wgDBuser ) . 
-						"\" must be able to access the schema. ".
-						"You can try making them the owner of the database, or try creating the schema with a ".
-						"different user, and then grant access to the \"" . 
-						htmlspecialchars( $wgDBuser ) . "\" user.</li>\n";
-					dieout("</ul>");
-				}
-				print "OK</li>\n";
-			}
-			else if ($result != $wgDBuser) {
-				print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists but is not owned by \"" . 
-					htmlspecialchars( $wgDBuser ) . "\". Not ideal.</li>\n";
-			}
-			else {
-				print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists and is owned by \"" . 
-					htmlspecialchars( $wgDBuser ) . "\". Excellent.</li>\n";
-			}
-
-			// Always return GMT time to accomodate the existing integer-based timestamp assumption
-			print "<li>Setting the timezone to GMT for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
-			$SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
-			$result = pg_query($this->mConn, $SQL);
-			if (!$result) {
-				print "<b>FAILED</b>.</li>\n";
-				dieout("</ul>");
-			}
-			print "OK</li>\n";
-			// Set for the rest of this session
-			$SQL = "SET timezone = 'GMT'";
-			$result = pg_query($this->mConn, $SQL);
-			if (!$result) {
-				print "<li>Failed to set timezone</li>\n";
-				dieout("</ul>");
-			}
-
-			print "<li>Setting the datestyle to ISO, YMD for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
-			$SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
-			$result = pg_query($this->mConn, $SQL);
-			if (!$result) {
-				print "<b>FAILED</b>.</li>\n";
-				dieout("</ul>");
-			}
-			print "OK</li>\n";
-			// Set for the rest of this session
-			$SQL = "SET datestyle = 'ISO, YMD'";
-			$result = pg_query($this->mConn, $SQL);
-			if (!$result) {
-				print "<li>Failed to set datestyle</li>\n";
-				dieout("</ul>");
-			}
-
-			// Fix up the search paths if needed
-			print "<li>Setting the search path for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
-			$path = $this->quote_ident($wgDBmwschema);
-			if ($wgDBts2schema !== $wgDBmwschema)
-				$path .= ", ". $this->quote_ident($wgDBts2schema);
-			if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
-				$path .= ", public";
-			$SQL = "ALTER USER $safeuser SET search_path = $path";
-			$result = pg_query($this->mConn, $SQL);
-			if (!$result) {
-				print "<b>FAILED</b>.</li>\n";
-				dieout("</ul>");
-			}
-			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";
-				dieout("</ul>");
-			}
-			define( "POSTGRES_SEARCHPATH", $path );
-		}
-	}
-
-
-	function setup_plpgsql() {
-		print "<li>Checking for Pl/Pgsql ...";
-		$SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
-		$rows = $this->numRows($this->doQuery($SQL));
-		if ($rows < 1) {
-			// plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
-			print "not installed. Attempting to install Pl/Pgsql ...";
-			$SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
-				"WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
-			$rows = $this->numRows($this->doQuery($SQL));
-			if ($rows >= 1) {
-			$olde = error_reporting(0);
-				error_reporting($olde - E_WARNING);
-				$result = $this->doQuery("CREATE LANGUAGE plpgsql");
-				error_reporting($olde);
-				if (!$result) {
-					print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>" . 
-						htmlspecialchars( $wgDBname ) . "</tt></li>";
-					dieout("</ul>");
-				}
-			}
-			else {
-				print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>" . 
-					htmlspecialchars( $wgDBname ) . "</tt></li>";
-				dieout("</ul>");
-			}
-		}
-		print "OK</li>\n";
-	}
-
-
 	/**
 	 * Closes a database connection, if it is open
 	 * Returns success, true if already closed
@@ -578,15 +231,15 @@ class DatabasePostgres extends DatabaseBase {
 	}
 
 	function doQuery( $sql ) {
-		if (function_exists('mb_convert_encoding')) {
-			$sql = mb_convert_encoding($sql,'UTF-8');
+		if ( function_exists( 'mb_convert_encoding' ) ) {
+			$sql = mb_convert_encoding( $sql, 'UTF-8' );
 		}
-		$this->mLastResult = pg_query( $this->mConn, $sql);
+		$this->mLastResult = pg_query( $this->mConn, $sql );
 		$this->mAffectedRows = null; // use pg_affected_rows(mLastResult)
 		return $this->mLastResult;
 	}
 
-	function queryIgnore( $sql, $fname = '' ) {
+	function queryIgnore( $sql, $fname = 'DatabasePostgres::queryIgnore' ) {
 		return $this->query( $sql, $fname, true );
 	}
 
@@ -595,7 +248,7 @@ class DatabasePostgres extends DatabaseBase {
 			$res = $res->result;
 		}
 		if ( !@pg_free_result( $res ) ) {
-			throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
+			throw new DBUnexpectedError( $this, "Unable to free Postgres result\n" );
 		}
 	}
 
@@ -609,8 +262,8 @@ class DatabasePostgres extends DatabaseBase {
 		# TODO:
 		# hashar : not sure if the following test really trigger if the object
 		#          fetching failed.
-		if( pg_last_error($this->mConn) ) {
-			throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
+		if( pg_last_error( $this->mConn ) ) {
+			throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
 		}
 		return $row;
 	}
@@ -620,8 +273,8 @@ class DatabasePostgres extends DatabaseBase {
 			$res = $res->result;
 		}
 		@$row = pg_fetch_array( $res );
-		if( pg_last_error($this->mConn) ) {
-			throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
+		if( pg_last_error( $this->mConn ) ) {
+			throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
 		}
 		return $row;
 	}
@@ -631,17 +284,19 @@ class DatabasePostgres extends DatabaseBase {
 			$res = $res->result;
 		}
 		@$n = pg_num_rows( $res );
-		if( pg_last_error($this->mConn) ) {
-			throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
+		if( pg_last_error( $this->mConn ) ) {
+			throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
 		}
 		return $n;
 	}
+
 	function numFields( $res ) {
 		if ( $res instanceof ResultWrapper ) {
 			$res = $res->result;
 		}
 		return pg_num_fields( $res );
 	}
+
 	function fieldName( $res, $n ) {
 		if ( $res instanceof ResultWrapper ) {
 			$res = $res->result;
@@ -666,9 +321,8 @@ class DatabasePostgres extends DatabaseBase {
 	function lastError() {
 		if ( $this->mConn ) {
 			return pg_last_error();
-		}
-		else {
-			return "No database connection";
+		} else {
+			return 'No database connection';
 		}
 	}
 	function lastErrno() {
@@ -680,8 +334,9 @@ class DatabasePostgres extends DatabaseBase {
 			// Forced result for simulated queries
 			return $this->mAffectedRows;
 		}
-		if( empty( $this->mLastResult ) )
+		if( empty( $this->mLastResult ) ) {
 			return 0;
+		}
 		return pg_affected_rows( $this->mLastResult );
 	}
 
@@ -692,8 +347,7 @@ class DatabasePostgres extends DatabaseBase {
 	 * Returns -1 if count cannot be found
 	 * Takes same arguments as Database::select()
 	 */
-
-	function estimateRowCount( $table, $vars='*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
+	function estimateRowCount( $table, $vars = '*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
 		$options['EXPLAIN'] = true;
 		$res = $this->select( $table, $vars, $conds, $fname, $options );
 		$rows = -1;
@@ -703,12 +357,10 @@ class DatabasePostgres extends DatabaseBase {
 			if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 				$rows = $count[1];
 			}
-			$this->freeResult($res);
 		}
 		return $rows;
 	}
 
-
 	/**
 	 * Returns information about an index
 	 * If errors are explicitly ignored, returns NULL on failure
@@ -719,7 +371,7 @@ class DatabasePostgres extends DatabaseBase {
 		if ( !$res ) {
 			return null;
 		}
-		while ( $row = $this->fetchObject( $res ) ) {
+		foreach ( $res as $row ) {
 			if ( $row->indexname == $this->indexName( $index ) ) {
 				return $row;
 			}
@@ -727,18 +379,19 @@ class DatabasePostgres extends DatabaseBase {
 		return false;
 	}
 
-	function indexUnique ($table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
+	function indexUnique( $table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
 		$sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
-			" AND indexdef LIKE 'CREATE UNIQUE%(" . 
+			" AND indexdef LIKE 'CREATE UNIQUE%(" .
 			$this->strencode( $this->indexName( $index ) ) .
 			")'";
 		$res = $this->query( $sql, $fname );
-		if ( !$res )
+		if ( !$res ) {
 			return null;
-		while ($row = $this->fetchObject( $res ))
+		}
+		foreach ( $res as $row ) {
 			return true;
+		}
 		return false;
-
 	}
 
 	/**
@@ -755,25 +408,23 @@ class DatabasePostgres extends DatabaseBase {
 	 * @return bool Success of insert operation. IGNORE always returns true.
 	 */
 	function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
-		global $wgDBversion;
-
 		if ( !count( $args ) ) {
 			return true;
 		}
 
 		$table = $this->tableName( $table );
-		if (! isset( $wgDBversion ) ) {
-			$wgDBversion = $this->getServerVersion();
+		if (! isset( $this->numeric_version ) ) {
+			$this->getServerVersion();
 		}
 
-		if ( !is_array( $options ) )
+		if ( !is_array( $options ) ) {
 			$options = array( $options );
+		}
 
 		if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 			$multi = true;
 			$keys = array_keys( $args[0] );
-		}
-		else {
+		} else {
 			$multi = false;
 			$keys = array_keys( $args );
 		}
@@ -784,7 +435,7 @@ class DatabasePostgres extends DatabaseBase {
 		// If we are not in a transaction, we need to be for savepoint trickery
 		$didbegin = 0;
 		if ( $ignore ) {
-			if (! $this->mTrxLevel) {
+			if ( !$this->mTrxLevel ) {
 				$this->begin();
 				$didbegin = 1;
 			}
@@ -797,7 +448,7 @@ class DatabasePostgres extends DatabaseBase {
 		$sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 
 		if ( $multi ) {
-			if ( $wgDBversion >= 8.2 && !$ignore ) {
+			if ( $this->numeric_version >= 8.2 && !$ignore ) {
 				$first = true;
 				foreach ( $args as $row ) {
 					if ( $first ) {
@@ -808,8 +459,7 @@ class DatabasePostgres extends DatabaseBase {
 					$sql .= '(' . $this->makeList( $row ) . ')';
 				}
 				$res = (bool)$this->query( $sql, $fname, $ignore );
-			}
-			else {
+			} else {
 				$res = true;
 				$origsql = $sql;
 				foreach ( $args as $row ) {
@@ -817,17 +467,16 @@ class DatabasePostgres extends DatabaseBase {
 					$tempsql .= '(' . $this->makeList( $row ) . ')';
 
 					if ( $ignore ) {
-						pg_query($this->mConn, "SAVEPOINT $ignore");
+						pg_query( $this->mConn, "SAVEPOINT $ignore" );
 					}
 
 					$tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 
 					if ( $ignore ) {
 						$bar = pg_last_error();
-						if ($bar != false) {
+						if ( $bar != false ) {
 							pg_query( $this->mConn, "ROLLBACK TO $ignore" );
-						}
-						else {
+						} else {
 							pg_query( $this->mConn, "RELEASE $ignore" );
 							$numrowsinserted++;
 						}
@@ -835,12 +484,12 @@ class DatabasePostgres extends DatabaseBase {
 
 					// If any of them fail, we fail overall for this function call
 					// Note that this will be ignored if IGNORE is set
-					if (! $tempres)
+					if ( !$tempres ) {
 						$res = false;
+					}
 				}
 			}
-		}
-		else {
+		} else {
 			// Not multi, just a lone insert
 			if ( $ignore ) {
 				pg_query($this->mConn, "SAVEPOINT $ignore");
@@ -850,10 +499,9 @@ class DatabasePostgres extends DatabaseBase {
 			$res = (bool)$this->query( $sql, $fname, $ignore );
 			if ( $ignore ) {
 				$bar = pg_last_error();
-				if ($bar != false) {
+				if ( $bar != false ) {
 					pg_query( $this->mConn, "ROLLBACK TO $ignore" );
-				}
-				else {
+				} else {
 					pg_query( $this->mConn, "RELEASE $ignore" );
 					$numrowsinserted++;
 				}
@@ -861,7 +509,7 @@ class DatabasePostgres extends DatabaseBase {
 		}
 		if ( $ignore ) {
 			$olde = error_reporting( $olde );
-			if ($didbegin) {
+			if ( $didbegin ) {
 				$this->commit();
 			}
 
@@ -872,9 +520,7 @@ class DatabasePostgres extends DatabaseBase {
 			return true;
 		}
 
-
 		return $res;
-
 	}
 
 	/**
@@ -884,7 +530,7 @@ class DatabasePostgres extends DatabaseBase {
 	 * $conds may be "*" to copy the whole table
 	 * srcTable may be an array of tables.
 	 * @todo FIXME: implement this a little better (seperate select/insert)?
-	*/
+	 */
 	function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabasePostgres::insertSelect',
 		$insertOptions = array(), $selectOptions = array() )
 	{
@@ -922,7 +568,7 @@ class DatabasePostgres extends DatabaseBase {
 				" SELECT $startOpts " . implode( ',', $varMap ) .
 				" FROM $srcTable $useIndex";
 
-		if ( $conds != '*') {
+		if ( $conds != '*' ) {
 			$sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 		}
 
@@ -951,7 +597,7 @@ class DatabasePostgres extends DatabaseBase {
 
 		return $res;
 	}
-	
+
 	function tableName( $name ) {
 		# Replace reserved words with better ones
 		switch( $name ) {
@@ -968,11 +614,10 @@ class DatabasePostgres extends DatabaseBase {
 	 * Return the next in a sequence, save the value for retrieval via insertId()
 	 */
 	function nextSequenceValue( $seqName ) {
-		$safeseq = preg_replace( "/'/", "''", $seqName );
+		$safeseq = str_replace( "'", "''", $seqName );
 		$res = $this->query( "SELECT nextval('$safeseq')" );
 		$row = $this->fetchRow( $res );
 		$this->mInsertId = $row[0];
-		$this->freeResult( $res );
 		return $this->mInsertId;
 	}
 
@@ -980,27 +625,28 @@ class DatabasePostgres extends DatabaseBase {
 	 * Return the current value of a sequence. Assumes it has been nextval'ed in this session.
 	 */
 	function currentSequenceValue( $seqName ) {
-		$safeseq = preg_replace( "/'/", "''", $seqName );
+		$safeseq = str_replace( "'", "''", $seqName );
 		$res = $this->query( "SELECT currval('$safeseq')" );
 		$row = $this->fetchRow( $res );
 		$currval = $row[0];
-		$this->freeResult( $res );
 		return $currval;
 	}
 
-	# REPLACE query wrapper
-	# Postgres simulates this with a DELETE followed by INSERT
-	# $row is the row to insert, an associative array
-	# $uniqueIndexes is an array of indexes. Each element may be either a
-	# field name or an array of field names
-	#
-	# It may be more efficient to leave off unique indexes which are unlikely to collide.
-	# However if you do this, you run the risk of encountering errors which wouldn't have
-	# occurred in MySQL
+	/**
+	 * REPLACE query wrapper
+	 * Postgres simulates this with a DELETE followed by INSERT
+	 * $row is the row to insert, an associative array
+	 * $uniqueIndexes is an array of indexes. Each element may be either a
+	 * field name or an array of field names
+	 *
+	 * It may be more efficient to leave off unique indexes which are unlikely to collide.
+	 * However if you do this, you run the risk of encountering errors which wouldn't have
+	 * occurred in MySQL
+	 */
 	function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabasePostgres::replace' ) {
 		$table = $this->tableName( $table );
 
-		if (count($rows)==0) {
+		if ( count( $rows ) == 0 ) {
 			return;
 		}
 
@@ -1017,7 +663,7 @@ class DatabasePostgres extends DatabaseBase {
 				foreach ( $uniqueIndexes as $index ) {
 					if ( $first ) {
 						$first = false;
-						$sql .= "(";
+						$sql .= '(';
 					} else {
 						$sql .= ') OR (';
 					}
@@ -1049,7 +695,7 @@ class DatabasePostgres extends DatabaseBase {
 	# DELETE where the condition is a join
 	function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabasePostgres::deleteJoin' ) {
 		if ( !$conds ) {
-			throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
+			throw new DBUnexpectedError( $this, 'DatabasePostgres::deleteJoin() called with empty $conds' );
 		}
 
 		$delTable = $this->tableName( $delTable );
@@ -1070,19 +716,18 @@ class DatabasePostgres extends DatabaseBase {
 			FROM pg_class c, pg_attribute a, pg_type t
 			WHERE relname='$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;
+		$res =$this->query( $sql );
+		$row = $this->fetchObject( $res );
+		if ( $row->ftype == 'varchar' ) {
+			$size = $row->size - 4;
 		} else {
-			$size=$row->size;
+			$size = $row->size;
 		}
-		$this->freeResult( $res );
 		return $size;
 	}
 
-	function limitResult($sql, $limit, $offset=false) {
-		return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
+	function limitResult( $sql, $limit, $offset = false ) {
+		return "$sql LIMIT $limit " . ( is_numeric( $offset ) ? " OFFSET {$offset} " : '' );
 	}
 
 	function wasDeadlock() {
@@ -1093,57 +738,40 @@ class DatabasePostgres extends DatabaseBase {
 		return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName (LIKE $oldName INCLUDING DEFAULTS)", $fname );
 	}
 
-	function timestamp( $ts=0 ) {
-		return wfTimestamp(TS_POSTGRES,$ts);
+	function timestamp( $ts = 0 ) {
+		return wfTimestamp( TS_POSTGRES, $ts );
 	}
 
 	/**
 	 * Return aggregated value function call
 	 */
-	function aggregateValue ($valuedata,$valuename='value') {
+	function aggregateValue( $valuedata, $valuename = 'value' ) {
 		return $valuedata;
 	}
 
-
-	function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
-		// 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 {
-			$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]";
+	public static function getSoftwareLink() {
+		return '[http://www.postgresql.org/ PostgreSQL]';
 	}
 
 	/**
 	 * @return string Version information from the database
 	 */
 	function getServerVersion() {
-		$versionInfo = pg_version( $this->mConn );
-		if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
-			// Old client, abort install
-			$this->numeric_version = '7.3 or earlier';
-		} elseif ( isset( $versionInfo['server'] ) ) {
-			// Normal client
-			$this->numeric_version = $versionInfo['server'];
-		} else {
-			// Bug 16937: broken pgsql extension from PHP<5.3
-			$this->numeric_version = pg_parameter_status( $this->mConn, 'server_version' );
+		if ( !isset( $this->numeric_version ) ) {
+			$versionInfo = pg_version( $this->mConn );
+			if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
+				// Old client, abort install
+				$this->numeric_version = '7.3 or earlier';
+			} elseif ( isset( $versionInfo['server'] ) ) {
+				// Normal client
+				$this->numeric_version = $versionInfo['server'];
+			} else {
+				// Bug 16937: broken pgsql extension from PHP<5.3
+				$this->numeric_version = pg_parameter_status( $this->mConn, 'server_version' );
+			}
 		}
 		return $this->numeric_version;
 	}
@@ -1154,23 +782,23 @@ class DatabasePostgres extends DatabaseBase {
 	 */
 	function relationExists( $table, $types, $schema = false ) {
 		global $wgDBmwschema;
-		if ( !is_array( $types ) )
+		if ( !is_array( $types ) ) {
 			$types = array( $types );
-		if ( !$schema )
+		}
+		if ( !$schema ) {
 			$schema = $wgDBmwschema;
+		}
 		$etable = $this->addQuotes( $table );
 		$eschema = $this->addQuotes( $schema );
 		$SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
 			. "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
-			. "AND c.relkind IN ('" . implode("','", $types) . "')";
+			. "AND c.relkind IN ('" . implode( "','", $types ) . "')";
 		$res = $this->query( $SQL );
 		$count = $res ? $res->numRows() : 0;
-		if ($res)
-			$this->freeResult( $res );
-		return $count ? true : false;
+		return (bool)$count;
 	}
 
-	/*
+	/**
 	 * For backward compatibility, this function checks both tables and
 	 * views.
 	 */
@@ -1191,82 +819,71 @@ class DatabasePostgres extends DatabaseBase {
 		      AND tgrelid=pg_class.oid
 		      AND nspname=%s AND relname=%s AND tgname=%s
 SQL;
-		$res = $this->query(sprintf($q,
-				$this->addQuotes($wgDBmwschema),
-				$this->addQuotes($table),
-				$this->addQuotes($trigger)));
-		if (!$res)
+		$res = $this->query(
+			sprintf(
+				$q,
+				$this->addQuotes( $wgDBmwschema ),
+				$this->addQuotes( $table ),
+				$this->addQuotes( $trigger )
+			)
+		);
+		if ( !$res ) {
 			return null;
+		}
 		$rows = $res->numRows();
-		$this->freeResult( $res );
 		return $rows;
 	}
 
 	function ruleExists( $table, $rule ) {
 		global $wgDBmwschema;
-		$exists = $this->selectField("pg_rules", "rulename",
-				array(	"rulename" => $rule,
-					"tablename" => $table,
-					"schemaname" => $wgDBmwschema ) );
+		$exists = $this->selectField( 'pg_rules', 'rulename',
+			array(
+				'rulename' => $rule,
+				'tablename' => $table,
+				'schemaname' => $wgDBmwschema
+			)
+		);
 		return $exists === $rule;
 	}
 
 	function constraintExists( $table, $constraint ) {
 		global $wgDBmwschema;
-		$SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
+		$SQL = sprintf( "SELECT 1 FROM information_schema.table_constraints ".
 			   "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
-			$this->addQuotes($wgDBmwschema),
-			$this->addQuotes($table),
-			$this->addQuotes($constraint));
-		$res = $this->query($SQL);
-		if (!$res)
+			$this->addQuotes( $wgDBmwschema ),
+			$this->addQuotes( $table ),
+			$this->addQuotes( $constraint )
+		);
+		$res = $this->query( $SQL );
+		if ( !$res ) {
 			return null;
+		}
 		$rows = $res->numRows();
-		$this->freeResult($res);
 		return $rows;
 	}
 
 	/**
-	 * Query whether a given schema exists. Returns the name of the owner
+	 * Query whether a given schema exists. Returns true if it does, false if it doesn't.
 	 */
 	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 );
-		if ( $res && $res->numRows() ) {
-			$row = $res->fetchObject();
-			$owner = $row->rolname;
-		} else {
-			$owner = false;
-		}
-		if ($res)
-			$this->freeResult($res);
-		return $owner;
+		$exists = $this->selectField( '"pg_catalog"."pg_namespace"', 1,
+			array( 'nspname' => $schema ), __METHOD__ );
+		return (bool)$exists;
 	}
 
 	/**
-	 * Query whether a given column exists in the mediawiki schema
+	 * Returns true if a given role (i.e. user) exists, false otherwise.
 	 */
-	function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
-		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, $fname );
-		$count = $res ? $res->numRows() : 0;
-		if ($res)
-			$this->freeResult( $res );
-		return $count;
+	function roleExists( $roleName ) {
+		$exists = $this->selectField( '"pg_catalog"."pg_roles"', 1,
+			array( 'rolname' => $roleName ), __METHOD__ );
+		return (bool)$exists;
 	}
 
 	function fieldInfo( $table, $field ) {
-		return PostgresField::fromText($this, $table, $field);
+		return PostgresField::fromText( $this, $table, $field );
 	}
-	
+
 	/**
 	 * pg_field_type() wrapper
 	 */
@@ -1277,119 +894,35 @@ SQL;
 		return pg_field_type( $res, $index );
 	}
 
-	function begin( $fname = 'DatabasePostgres::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 setup_database() {
-		global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
-
-		// Make sure that we can write to the correct schema
-		// If not, Postgres will happily and silently go to the next search_path item
-		$ctest = "mediawiki_test_table";
-		$safeschema = $this->quote_ident($wgDBmwschema);
-		if ($this->tableExists($ctest, $wgDBmwschema)) {
-			$this->doQuery("DROP TABLE $safeschema.$ctest");
-		}
-		$SQL = "CREATE TABLE $safeschema.$ctest(a int)";
-		$olde = error_reporting( 0 );
-		$res = $this->doQuery($SQL);
-		error_reporting( $olde );
-		if (!$res) {
-			print "<b>FAILED</b>. Make sure that the user \"" . htmlspecialchars( $wgDBuser ) . 
-				"\" can write to the schema \"" . htmlspecialchars( $wgDBmwschema ) . "\"</li>\n";
-			dieout(""); # Will close the main list <ul> and finish the page.
-		}
-		$this->doQuery("DROP TABLE $safeschema.$ctest");
-
-		$res = $this->sourceFile( "../maintenance/postgres/tables.sql" );
-		if ($res === true) {
-			print " done.</li>\n";
-		} else {
-			print " <b>FAILED</b></li>\n";
-			dieout( htmlspecialchars( $res ) );
-		}
-
-		## Update version information
-		$mwv = $this->addQuotes($wgVersion);
-		$pgv = $this->addQuotes($this->getServerVersion());
-		$pgu = $this->addQuotes($this->mUser);
-		$mws = $this->addQuotes($wgDBmwschema);
-		$tss = $this->addQuotes($wgDBts2schema);
-		$pgp = $this->addQuotes($wgDBport);
-		$dbn = $this->addQuotes($this->mDBname);
-		$ctype = $this->addQuotes( pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0) );
-
-		$SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
-				"mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
-				"ctype = $ctype ".
-				"WHERE type = 'Creation'";
-		$this->query($SQL);
-
-		echo "<li>Populating interwiki table... ";
-
-		## Avoid the non-standard "REPLACE INTO" syntax
-		$f = fopen( "../maintenance/interwiki.sql", 'r' );
-		if ($f == false ) {
-			print "<b>FAILED</b></li>";
-			dieout( "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);
-			$matches = array();
-			if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
-				continue;
-			}
-			$this->query("$SQL $matches[1],$matches[2])");
-		}
-		print " successfully populated.</li>\n";
-
-		$this->doQuery("COMMIT");
-	}
-
 	function encodeBlob( $b ) {
-		return new Blob ( pg_escape_bytea( $b ) ) ;
+		return new Blob( pg_escape_bytea( $this->mConn, $b ) );
 	}
 
 	function decodeBlob( $b ) {
-		if ($b instanceof Blob) {
+		if ( $b instanceof Blob ) {
 			$b = $b->fetch();
 		}
 		return pg_unescape_bytea( $b );
 	}
 
-	function strencode( $s ) { ## Should not be called by us
-		return pg_escape_string( $s );
+	function strencode( $s ) { # Should not be called by us
+		return pg_escape_string( $this->mConn, $s );
 	}
 
 	function addQuotes( $s ) {
 		if ( is_null( $s ) ) {
 			return 'NULL';
-		} else if ( is_bool( $s ) ) {
+		} elseif ( is_bool( $s ) ) {
 			return intval( $s );
-		} else if ($s instanceof Blob) {
-			return "'".$s->fetch($s)."'";
+		} elseif ( $s instanceof Blob ) {
+			return "'" . $s->fetch( $s ) . "'";
 		}
-		return "'" . pg_escape_string($s) . "'";
-	}
-
-	function quote_ident( $s ) {
-		return '"' . preg_replace( '/"/', '""', $s) . '"';
+		return "'" . pg_escape_string( $this->mConn, $s ) . "'";
 	}
 
 	/**
@@ -1403,15 +936,14 @@ SQL;
 	 * @return string SQL string
 	 */
 	protected function replaceVars( $ins ) {
-
 		$ins = parent::replaceVars( $ins );
 
-		if ($this->numeric_version >= 8.3) {
+		if ( $this->numeric_version >= 8.3 ) {
 			// Thanks for not providing backwards-compatibility, 8.3
 			$ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
 		}
 
-		if ($this->numeric_version <= 8.1) { // Our minimum version
+		if ( $this->numeric_version <= 8.1 ) { // Our minimum version
 			$ins = str_replace( 'USING gin', 'USING gist', $ins );
 		}
 
@@ -1438,33 +970,35 @@ SQL;
 			}
 		}
 
-		if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
-		if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
-		if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
+		if ( isset( $options['GROUP BY'] ) ) {
+			$preLimitTail .= ' GROUP BY ' . $options['GROUP BY'];
+		}
+		if ( isset( $options['HAVING'] ) ) {
+			$preLimitTail .= " HAVING {$options['HAVING']}";
+		}
+		if ( isset( $options['ORDER BY'] ) ) {
+			$preLimitTail .= ' ORDER BY ' . $options['ORDER BY'];
+		}
 
-		//if (isset($options['LIMIT'])) {
-		//	$tailOpts .= $this->limitResult('', $options['LIMIT'],
-		//		isset($options['OFFSET']) ? $options['OFFSET']
-		//		: false);
+		//if ( isset( $options['LIMIT'] ) ) {
+		//	$tailOpts .= $this->limitResult( '', $options['LIMIT'],
+		//		isset( $options['OFFSET'] ) ? $options['OFFSET']
+		//		: false );
 		//}
 
-		if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
-		if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
-		if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
+		if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
+			$postLimitTail .= ' FOR UPDATE';
+		}
+		if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) {
+			$postLimitTail .= ' LOCK IN SHARE MODE';
+		}
+		if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
+			$startOpts .= 'DISTINCT';
+		}
 
 		return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
 	}
 
-	/**
-	 * How lagged is this slave?
-	 *
-	 */
-	public function getLag() {
-		# Not implemented for PostgreSQL
-		return false;
-	}
-
-	function setFakeSlaveLag( $lag ) {}
 	function setFakeMaster( $enabled = true ) {}
 
 	function getDBname() {
@@ -1480,6 +1014,6 @@ SQL;
 	}
 
 	public function getSearchEngine() {
-		return "SearchPostgres";
+		return 'SearchPostgres';
 	}
 } // end DatabasePostgres class
-- 
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