402 lines
11 KiB
PHP
402 lines
11 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Frank Karlitschek
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* @copyright 2010 Frank Karlitschek karlitschek@kde.org
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* This class manages the access to the database. It basically is a wrapper for
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* MDB2 with some adaptions.
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*/
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class OC_DB {
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static private $DBConnection=false;
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static private $schema=false;
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static private $affected=0;
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static private $result=false;
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/**
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* @brief connects to the database
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* @returns true if connection can be established or nothing (die())
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*
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* Connects to the database as specified in config.php
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*/
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static public function connect(){
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// The global data we need
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$CONFIG_DBNAME = OC_Config::getValue( "dbname", "owncloud" );;
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$CONFIG_DBHOST = OC_Config::getValue( "dbhost", "" );;
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$CONFIG_DBUSER = OC_Config::getValue( "dbuser", "" );;
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$CONFIG_DBPASSWORD = OC_Config::getValue( "dbpassword", "" );;
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$CONFIG_DBTYPE = OC_Config::getValue( "dbtype", "sqlite" );;
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$datadir=OC_Config::getValue( "datadirectory", OC::$SERVERROOT."/data" );
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// do nothing if the connection already has been established
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if(!self::$DBConnection){
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// Require MDB2.php (not required in the head of the file so we only load it when needed)
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require_once('MDB2.php');
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// Prepare options array
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$options = array(
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'portability' => MDB2_PORTABILITY_ALL,
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'log_line_break' => '<br>',
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'idxname_format' => '%s',
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'debug' => true,
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'quote_identifier' => true );
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// Add the dsn according to the database type
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if( $CONFIG_DBTYPE == 'sqlite' or $CONFIG_DBTYPE == 'sqlite3' ){
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// sqlite
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$dsn = array(
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'phptype' => $CONFIG_DBTYPE,
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'database' => "$datadir/$CONFIG_DBNAME.db",
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'mode' => '0644' );
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}
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elseif( $CONFIG_DBTYPE == 'mysql' ){
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// MySQL
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$dsn = array(
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'phptype' => 'mysql',
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'username' => $CONFIG_DBUSER,
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'password' => $CONFIG_DBPASSWORD,
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'hostspec' => $CONFIG_DBHOST,
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'database' => $CONFIG_DBNAME );
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}
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elseif( $CONFIG_DBTYPE == 'pgsql' ){
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// PostgreSQL
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$dsn = array(
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'phptype' => 'pgsql',
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'username' => $CONFIG_DBUSER,
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'password' => $CONFIG_DBPASSWORD,
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'hostspec' => $CONFIG_DBHOST,
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'database' => $CONFIG_DBNAME );
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}
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// Try to establish connection
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self::$DBConnection = MDB2::factory( $dsn, $options );
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// Die if we could not connect
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if( PEAR::isError( self::$DBConnection )){
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echo( '<b>can not connect to database, using '.$CONFIG_DBTYPE.'. ('.self::$DBConnection->getUserInfo().')</center>');
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$error = self::$DBConnection->getMessage();
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if(defined("DEBUG") && DEBUG) {error_log( $error);}
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if(defined("DEBUG") && DEBUG) {error_log( self::$DBConnection->getUserInfo());}
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die( $error );
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}
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// We always, really always want associative arrays
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self::$DBConnection->setFetchMode(MDB2_FETCHMODE_ASSOC);
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//we need to function module for query pre-procesing
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self::$DBConnection->loadModule('Function');
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}
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// we are done. great!
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return true;
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}
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/**
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* @brief SQL query
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* @param $query Query string
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* @returns result as MDB2_Result
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*
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* SQL query via MDB2 query()
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*/
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static public function query( $query ){
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// Optimize the query
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$query = self::processQuery( $query );
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self::connect();
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//fix differences between sql versions
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// return the result
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$result = self::$DBConnection->exec( $query );
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// Die if we have an error (error means: bad query, not 0 results!)
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if( PEAR::isError($result)) {
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$entry = 'DB Error: "'.$result->getMessage().'"<br />';
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$entry .= 'Offending command was: '.$query.'<br />';
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if(defined("DEBUG") && DEBUG) {error_log( $entry );}
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die( $entry );
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}
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return $result;
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}
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/**
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* @brief Prepare a SQL query
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* @param $query Query string
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* @returns prepared SQL query
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*
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* SQL query via MDB2 prepare(), needs to be execute()'d!
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*/
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static public function prepare( $query ){
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// Optimize the query
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$query = self::processQuery( $query );
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self::connect();
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// return the result
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$result = self::$DBConnection->prepare( $query );
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// Die if we have an error (error means: bad query, not 0 results!)
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if( PEAR::isError($result)) {
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$entry = 'DB Error: "'.$result->getMessage().'"<br />';
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$entry .= 'Offending command was: '.$query.'<br />';
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if(defined("DEBUG") && DEBUG) {error_log( $entry );}
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die( $entry );
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}
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return $result;
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}
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/**
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* @brief gets last value of autoincrement
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* @returns id
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*
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* MDB2 lastInsertID()
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*
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* Call this method right after the insert command or other functions may
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* cause trouble!
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*/
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public static function insertid(){
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self::connect();
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return self::$DBConnection->lastInsertID();
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}
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/**
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* @brief Disconnect
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* @returns true/false
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*
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* This is good bye, good bye, yeah!
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*/
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public static function disconnect(){
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// Cut connection if required
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if(self::$DBConnection){
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self::$DBConnection->disconnect();
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self::$DBConnection=false;
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}
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return true;
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}
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/**
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* @brief Escapes bad characters
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* @param $string string with dangerous characters
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* @returns escaped string
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*
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* MDB2 escape()
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*/
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public static function escape( $string ){
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self::connect();
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return self::$DBConnection->escape( $string );
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}
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/**
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* @brief saves database scheme to xml file
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* @param $file name of file
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* @returns true/false
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*
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* TODO: write more documentation
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*/
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public static function getDbStructure( $file ){
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self::connectScheme();
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// write the scheme
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$definition = self::$schema->getDefinitionFromDatabase();
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$dump_options = array(
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'output_mode' => 'file',
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'output' => $file,
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'end_of_line' => "\n"
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);
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self::$schema->dumpDatabase( $definition, $dump_options, MDB2_SCHEMA_DUMP_STRUCTURE );
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return true;
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}
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/**
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* @brief Creates tables from XML file
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* @param $file file to read structure from
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* @returns true/false
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*
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* TODO: write more documentation
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*/
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public static function createDbFromStructure( $file ){
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$CONFIG_DBNAME = OC_Config::getValue( "dbname", "owncloud" );
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$CONFIG_DBTABLEPREFIX = OC_Config::getValue( "dbtableprefix", "oc_" );
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$CONFIG_DBTYPE = OC_Config::getValue( "dbtype", "sqlite" );
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self::connectScheme();
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// read file
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$content = file_get_contents( $file );
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// Make changes and save them to a temporary file
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$file2 = tempnam( sys_get_temp_dir(), 'oc_db_scheme_' );
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$content = str_replace( '*dbname*', $CONFIG_DBNAME, $content );
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$content = str_replace( '*dbprefix*', $CONFIG_DBTABLEPREFIX, $content );
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if( $CONFIG_DBTYPE == 'pgsql' ){ //mysql support it too but sqlite don't
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$content = str_replace( '<default>0000-00-00 00:00:00</default>', '<default>CURRENT_TIMESTAMP</default>', $content );
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}
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file_put_contents( $file2, $content );
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// Try to create tables
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$definition = self::$schema->parseDatabaseDefinitionFile( $file2 );
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// Delete our temporary file
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unlink( $file2 );
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// Die in case something went wrong
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if( $definition instanceof MDB2_Schema_Error ){
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die( $definition->getMessage().': '.$definition->getUserInfo());
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}
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// if(OC_Config::getValue('dbtype','sqlite')=='sqlite'){
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// $definition['overwrite']=true;//always overwrite for sqlite
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// }
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$ret=self::$schema->createDatabase( $definition );
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// Die in case something went wrong
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if( $ret instanceof MDB2_Error ){
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die ($ret->getMessage() . ': ' . $ret->getUserInfo());
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}
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return true;
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}
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/**
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* @brief connects to a MDB2 database scheme
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* @returns true/false
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*
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* Connects to a MDB2 database scheme
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*/
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private static function connectScheme(){
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// We need a database connection
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self::connect();
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// Connect if this did not happen before
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if(!self::$schema){
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require_once('MDB2/Schema.php');
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self::$schema=MDB2_Schema::factory(self::$DBConnection);
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}
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return true;
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}
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/**
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* @brief does minor chages to query
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* @param $query Query string
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* @returns corrected query string
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*
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* This function replaces *PREFIX* with the value of $CONFIG_DBTABLEPREFIX
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* and replaces the ` woth ' or " according to the database driver.
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*/
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private static function processQuery( $query ){
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self::connect();
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// We need Database type and table prefix
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$CONFIG_DBTYPE = OC_Config::getValue( "dbtype", "sqlite" );
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$CONFIG_DBTABLEPREFIX = OC_Config::getValue( "dbtableprefix", "oc_" );
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// differences is getting the current timestamp
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$query = str_replace( 'NOW()', self::$DBConnection->now(), $query );
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$query = str_replace( 'now()', self::$DBConnection->now(), $query );
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// differences in escaping of table names (` for mysql)
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// Problem: what if there is a ` in the value we want to insert?
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if( $CONFIG_DBTYPE == 'sqlite' ){
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$query = str_replace( '`', '\'', $query );
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}
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elseif( $CONFIG_DBTYPE == 'pgsql' ){
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$query = str_replace( '`', '"', $query );
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}
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// replace table name prefix
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$query = str_replace( '*PREFIX*', $CONFIG_DBTABLEPREFIX, $query );
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return $query;
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}
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/**
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* @brief drop a table
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* @param string $tableNamme the table to drop
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*/
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public static function dropTable($tableName){
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self::connect();
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self::$DBConnection->loadModule('Manager');
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self::$DBConnection->dropTable($tableName);
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}
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/**
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* remove all tables defined in a database structure xml file
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* @param string $file the xml file describing the tables
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*/
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public static function removeDBStructure($file){
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$CONFIG_DBNAME = OC_Config::getValue( "dbname", "owncloud" );
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$CONFIG_DBTABLEPREFIX = OC_Config::getValue( "dbtableprefix", "oc_" );
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self::connectScheme();
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// read file
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$content = file_get_contents( $file );
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// Make changes and save them to a temporary file
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$file2 = tempnam( sys_get_temp_dir(), 'oc_db_scheme_' );
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$content = str_replace( '*dbname*', $CONFIG_DBNAME, $content );
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$content = str_replace( '*dbprefix*', $CONFIG_DBTABLEPREFIX, $content );
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file_put_contents( $file2, $content );
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// get the tables
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$definition = self::$schema->parseDatabaseDefinitionFile( $file2 );
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// Delete our temporary file
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unlink( $file2 );
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foreach($definition['tables'] as $name=>$table){
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self::dropTable($name);
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}
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}
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/**
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* Start a transaction or set a savepoint.
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* @param string $savePoint (optional) name of the savepoint to set
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*/
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public static function beginTransaction($savePoint=''){
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self::connect();
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if (!self::$DBConnection->supports('transactions')) {
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return false;
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}
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if($savePoint && !self::$DBConnection->supports('savepoints')){
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return false;
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}
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if($savePoint){
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self::$DBConnection->beginTransaction($savePoint);
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}else{
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self::$DBConnection->beginTransaction();
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}
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}
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/**
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* Commit the database changes done during a transaction that is in progress or release a savepoint.
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* @param string $savePoint (optional) name of the savepoint to commit
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*/
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public static function commit($savePoint=''){
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self::connect();
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if(!self::$DBConnection->inTransaction()){
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return false;
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}
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if($savePoint){
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self::$DBConnection->commit($savePoint);
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}else{
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self::$DBConnection->commit();
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}
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}
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}
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