557 lines
16 KiB
PHP
557 lines
16 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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const BACKEND_PDO=0;
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const BACKEND_MDB2=1;
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static private $connection; //the prefered connection to use, either PDO or MDB2
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static private $backend=null;
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static private $MDB2=false;
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static private $PDO=false;
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static private $schema=false;
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static private $affected=0;
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static private $result=false;
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/**
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* @brief connects to the database
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* @returns true if connection can be established or nothing (die())
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*
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* Connects to the database as specified in config.php
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*/
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public static function connect($backend=null){
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if(self::$connection){
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return;
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}
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if(is_null($backend)){
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$backend=self::BACKEND_MDB2;
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if(class_exists('PDO') && OC_Config::getValue('installed', false)){//check if we can use PDO, else use MDB2 (instalation always needs to be done my mdb2)
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$type = OC_Config::getValue( "dbtype", "sqlite" );
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if($type=='sqlite3') $type='sqlite';
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$drivers=PDO::getAvailableDrivers();
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if(array_search($type,$drivers)!==false){
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$backend=self::BACKEND_PDO;
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}
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}
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}
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if($backend==self::BACKEND_PDO){
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self::connectPDO();
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self::$connection=self::$PDO;
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self::$backend=self::BACKEND_PDO;
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}else{
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self::connectMDB2();
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self::$connection=self::$MDB2;
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self::$backend=self::BACKEND_MDB2;
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}
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}
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/**
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* connect to the database using pdo
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*/
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public static function connectPDO(){
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if(self::$connection){
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if(self::$backend==self::BACKEND_MDB2){
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self::disconnect();
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}else{
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return;
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}
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}
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// The global data we need
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$name = OC_Config::getValue( "dbname", "owncloud" );
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$host = OC_Config::getValue( "dbhost", "" );
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$user = OC_Config::getValue( "dbuser", "" );
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$pass = OC_Config::getValue( "dbpassword", "" );
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$type = OC_Config::getValue( "dbtype", "sqlite" );
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$datadir=OC_Config::getValue( "datadirectory", OC::$SERVERROOT.'/data' );
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// do nothing if the connection already has been established
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if(!self::$PDO){
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// Add the dsn according to the database type
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switch($type){
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case 'sqlite':
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$dsn='sqlite2:'.$datadir.'/'.$name.'.db';
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break;
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case 'sqlite3':
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$dsn='sqlite:'.$datadir.'/'.$name.'.db';
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break;
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case 'mysql':
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$dsn='mysql:dbname='.$name.';host='.$host;
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break;
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case 'pgsql':
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$dsn='pgsql:dbname='.$name.';host='.$host;
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break;
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}
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try{
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self::$PDO=new PDO($dsn,$user,$pass);
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}catch(PDOException $e){
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echo( '<b>can not connect to database, using '.$type.'. ('.$e->getMessage().')</center>');
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die();
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}
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// We always, really always want associative arrays
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self::$PDO->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE,PDO::FETCH_ASSOC);
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self::$PDO->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
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}
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return true;
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}
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/**
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* connect to the database using mdb2
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*/
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public static function connectMDB2(){
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if(self::$connection){
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if(self::$backend==self::BACKEND_PDO){
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self::disconnect();
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}else{
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return;
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}
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}
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// The global data we need
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$name = OC_Config::getValue( "dbname", "owncloud" );
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$host = OC_Config::getValue( "dbhost", "" );
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$user = OC_Config::getValue( "dbuser", "" );
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$pass = OC_Config::getValue( "dbpassword", "" );
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$type = OC_Config::getValue( "dbtype", "sqlite" );
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$SERVERROOT=OC::$SERVERROOT;
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$datadir=OC_Config::getValue( "datadirectory", "$SERVERROOT/data" );
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// do nothing if the connection already has been established
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if(!self::$MDB2){
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// Require MDB2.php (not required in the head of the file so we only load it when needed)
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require_once('MDB2.php');
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// Prepare options array
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$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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switch($type){
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case 'sqlite':
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case 'sqlite3':
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$dsn = array(
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'phptype' => $type,
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'database' => "$datadir/$name.db",
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'mode' => '0644'
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);
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break;
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case 'mysql':
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$dsn = array(
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'phptype' => 'mysql',
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'username' => $user,
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'password' => $pass,
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'hostspec' => $host,
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'database' => $name
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);
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break;
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case 'pgsql':
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$dsn = array(
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'phptype' => 'pgsql',
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'username' => $user,
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'password' => $pass,
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'hostspec' => $host,
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'database' => $name
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);
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break;
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}
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// Try to establish connection
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self::$MDB2 = MDB2::factory( $dsn, $options );
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// Die if we could not connect
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if( PEAR::isError( self::$MDB2 )){
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echo( '<b>can not connect to database, using '.$type.'. ('.self::$MDB2->getUserInfo().')</center>');
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OC_Log::write('core',self::$MDB2->getUserInfo(),OC_Log::FATAL);
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OC_Log::write('core',self::$MDB2->getMessage(),OC_Log::FATAL);
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die( $error );
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}
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// We always, really always want associative arrays
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self::$MDB2->setFetchMode(MDB2_FETCHMODE_ASSOC);
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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 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( $query );
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self::connect();
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// return the result
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if(self::$backend==self::BACKEND_MDB2){
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$result = self::$connection->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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OC_Log::write('core',$entry,OC_Log::FATAL);
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die( $entry );
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}
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}else{
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try{
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$result=self::$connection->prepare($query);
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}catch(PDOException $e){
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$entry = 'DB Error: "'.$e->getMessage().'"<br />';
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$entry .= 'Offending command was: '.$query.'<br />';
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OC_Log::write('core',$entry,OC_Log::FATAL);
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die( $entry );
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}
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$result=new PDOStatementWrapper($result);
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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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* @param $table string The optional table name (will replace *PREFIX*) and add sequence suffix
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* @returns id
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*
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* MDB2 lastInsertID()
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*
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* Call this method right after the insert command or other functions may
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* cause trouble!
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*/
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public static function insertid($table=null){
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self::connect();
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if($table !== null){
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$prefix = OC_Config::getValue( "dbtableprefix", "oc_" );
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$suffix = OC_Config::getValue( "dbsequencesuffix", "_id_seq" );
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$table = str_replace( '*PREFIX*', $prefix, $table );
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}
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return self::$connection->lastInsertId($table.$suffix);
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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::$connection){
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if(self::$backend==self::BACKEND_MDB2){
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self::$connection->disconnect();
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}
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self::$connection=false;
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self::$MDB2=false;
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self::$PDO=false;
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}
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return true;
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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( $file ,$mode=MDB2_SCHEMA_DUMP_STRUCTURE){
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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, $mode );
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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( 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( $CONFIG_DBTYPE == 'pgsql' ){ //mysql support it too but sqlite doesn't
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$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 update the database scheme
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* @param $file file to read structure from
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*/
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public static function updateDbFromStructure($file){
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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( $file );
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$previousSchema = self::$schema->getDefinitionFromDatabase();
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// Make changes and save them to a temporary file
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$file2 = tempnam( get_temp_dir(), 'oc_db_scheme_' );
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$content = str_replace( '*dbname*', $previousSchema['name'], $content );
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$content = str_replace( '*dbprefix*', $CONFIG_DBTABLEPREFIX, $content );
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if( $CONFIG_DBTYPE == 'pgsql' ){ //mysql support it too but sqlite doesn't
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$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, $content );
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$op = self::$schema->updateDatabase($file2, $previousSchema, array(), false);
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if (PEAR::isError($op)) {
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$error = $op->getMessage();
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OC_Log::write('core','Failed to update database structure ('.$error.')',OC_Log::FATAL);
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return false;
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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 mdb2 database connection
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self::connectMDB2();
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self::$MDB2->loadModule('Manager');
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// Connect if this did not happen before
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if(!self::$schema){
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require_once('MDB2/Schema.php');
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self::$schema=MDB2_Schema::factory(self::$MDB2);
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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( $query ){
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self::connect();
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// We need Database type and table prefix
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$type = OC_Config::getValue( "dbtype", "sqlite" );
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$prefix = OC_Config::getValue( "dbtableprefix", "oc_" );
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// differences in escaping of table names ('`' for mysql) and getting the current timestamp
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if( $type == 'sqlite' || $type == 'sqlite3' ){
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$query = str_replace( '`', '\'', $query );
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$query = str_replace( 'NOW()', 'datetime(\'now\')', $query );
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$query = str_replace( 'now()', 'datetime(\'now\')', $query );
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}elseif( $type == 'mysql' ){
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$query = str_replace( 'NOW()', 'CURRENT_TIMESTAMP', $query );
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$query = str_replace( 'now()', 'CURRENT_TIMESTAMP', $query );
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}elseif( $type == 'pgsql' ){
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$query = str_replace( '`', '"', $query );
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$query = str_replace( 'NOW()', 'CURRENT_TIMESTAMP', $query );
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$query = str_replace( 'now()', 'CURRENT_TIMESTAMP', $query );
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}
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// replace table name prefix
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$query = str_replace( '*PREFIX*', $prefix, $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::connectMDB2();
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self::$MDB2->loadModule('Manager');
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self::$MDB2->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( 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($name);
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}
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}
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/**
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* Start a transaction
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*/
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public static function beginTransaction(){
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self::connect();
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if (self::$backend=self::BACKEND_MDB2 && !self::$connection->supports('transactions')) {
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return false;
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}
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self::$connection->beginTransaction();
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}
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/**
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* Commit the database changes done during a transaction that is in progress
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*/
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public static function commit($savePoint=''){
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self::connect();
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if(!self::$connection->inTransaction()){
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return false;
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}
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self::$connection->commit();
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}
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}
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/**
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* small wrapper around PDOStatement to make it behave ,more like an MDB2 Statement
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*/
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class PDOStatementWrapper{
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private $statement=null;
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private $lastArguments=array();
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public function __construct($statement){
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$this->statement=$statement;
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}
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/**
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* make execute return the result instead of a bool
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*/
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public function execute($input=array()){
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$this->lastArguments=$input;
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if(count($input)>0){
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$this->statement->execute($input);
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}else{
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$this->statement->execute();
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}
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return $this;
|
|
}
|
|
|
|
/**
|
|
* provide numRows
|
|
*/
|
|
public function numRows(){
|
|
$regex = '/^SELECT\s+(?:ALL\s+|DISTINCT\s+)?(?:.*?)\s+FROM\s+(.*)$/i';
|
|
if (preg_match($regex, $this->statement->queryString, $output) > 0) {
|
|
$query = OC_DB::prepare("SELECT COUNT(*) FROM {$output[1]}", PDO::FETCH_NUM);
|
|
return $query->execute($this->lastArguments)->fetchColumn();
|
|
}else{
|
|
return $this->statement->rowCount();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* provide an alias for fetch
|
|
*/
|
|
public function fetchRow(){
|
|
return $this->statement->fetch();
|
|
}
|
|
|
|
/**
|
|
* pass all other function directly to the PDOStatement
|
|
*/
|
|
public function __call($name,$arguments){
|
|
return call_user_func_array(array($this->statement,$name),$arguments);
|
|
}
|
|
|
|
/**
|
|
* Provide a simple fetchOne.
|
|
* fetch single column from the next row
|
|
* @param int $colnum the column number to fetch
|
|
*/
|
|
public function fetchOne($colnum = 0){
|
|
return $this->statement->fetchColumn($colnum);
|
|
}
|
|
}
|