databasepostgres.php

来自「php 开发的内容管理系统」· PHP 代码 · 共 610 行 · 第 1/2 页

<?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':