672 lines
20 KiB
PHP
672 lines
20 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 2012 Frank Karlitschek frank@owncloud.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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define('MDB2_SCHEMA_DUMP_STRUCTURE', '1');
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class DatabaseException extends Exception {
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private $query;
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//FIXME getQuery seems to be unused, maybe use parent constructor with $message, $code and $previous
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public function __construct($message, $query = null){
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parent::__construct($message);
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$this->query = $query;
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}
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public function getQuery() {
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return $this->query;
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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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* Doctrine with some adaptions.
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*/
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class OC_DB {
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const BACKEND_DOCTRINE=2;
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/**
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* @var \Doctrine\DBAL\Connection
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*/
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static private $connection; //the preferred connection to use, only Doctrine
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static private $backend=null;
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/**
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* @var \Doctrine\DBAL\Connection
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*/
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static private $DOCTRINE=null;
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static private $inTransaction=false;
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static private $type=null;
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/**
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* check which backend we should use
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* @return int BACKEND_DOCTRINE
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*/
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private static function getDBBackend() {
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return self::BACKEND_DOCTRINE;
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}
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/**
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* @brief connects to the database
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* @param int $backend
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* @return bool true if connection can be established or false on error
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*
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* Connects to the database as specified in config.php
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*/
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public static function connect($backend=null) {
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if(self::$connection) {
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return true;
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}
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if(is_null($backend)) {
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$backend=self::getDBBackend();
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}
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if($backend==self::BACKEND_DOCTRINE) {
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$success = self::connectDoctrine();
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self::$connection=self::$DOCTRINE;
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self::$backend=self::BACKEND_DOCTRINE;
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}
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return $success;
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}
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/**
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* connect to the database using doctrine
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*
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* @return bool
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*/
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public static function connectDoctrine() {
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if(self::$connection) {
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if(self::$backend!=self::BACKEND_DOCTRINE) {
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self::disconnect();
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} else {
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return true;
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}
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}
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// The global data we need
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$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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if(strpos($host, ':')) {
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list($host, $port)=explode(':', $host, 2);
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} else {
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$port=false;
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}
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// do nothing if the connection already has been established
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if(!self::$DOCTRINE) {
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$config = new \Doctrine\DBAL\Configuration();
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switch($type) {
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case 'sqlite':
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case 'sqlite3':
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$datadir=OC_Config::getValue( "datadirectory", OC::$SERVERROOT.'/data' );
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$connectionParams = array(
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'user' => $user,
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'password' => $pass,
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'path' => $datadir.'/'.$name.'.db',
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'driver' => 'pdo_sqlite',
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);
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$connectionParams['adapter'] = '\OC\DB\AdapterSqlite';
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break;
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case 'mysql':
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$connectionParams = array(
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'user' => $user,
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'password' => $pass,
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'host' => $host,
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'port' => $port,
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'dbname' => $name,
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'charset' => 'UTF8',
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'driver' => 'pdo_mysql',
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);
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$connectionParams['adapter'] = '\OC\DB\Adapter';
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break;
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case 'pgsql':
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$connectionParams = array(
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'user' => $user,
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'password' => $pass,
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'host' => $host,
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'port' => $port,
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'dbname' => $name,
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'driver' => 'pdo_pgsql',
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);
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$connectionParams['adapter'] = '\OC\DB\AdapterPgSql';
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break;
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case 'oci':
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$connectionParams = array(
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'user' => $user,
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'password' => $pass,
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'host' => $host,
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'dbname' => $name,
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'charset' => 'AL32UTF8',
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'driver' => 'oci8',
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);
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if (!empty($port)) {
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$connectionParams['port'] = $port;
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}
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$connectionParams['adapter'] = '\OC\DB\AdapterOCI8';
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break;
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case 'mssql':
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$connectionParams = array(
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'user' => $user,
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'password' => $pass,
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'host' => $host,
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'port' => $port,
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'dbname' => $name,
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'charset' => 'UTF8',
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'driver' => 'pdo_sqlsrv',
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);
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$connectionParams['adapter'] = '\OC\DB\AdapterSQLSrv';
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break;
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default:
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return false;
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}
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$connectionParams['wrapperClass'] = 'OC\DB\Connection';
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$connectionParams['table_prefix'] = OC_Config::getValue( "dbtableprefix", "oc_" );
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try {
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self::$DOCTRINE = \Doctrine\DBAL\DriverManager::getConnection($connectionParams, $config);
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if ($type === 'sqlite' || $type === 'sqlite3') {
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// Sqlite doesn't handle query caching and schema changes
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// TODO: find a better way to handle this
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self::$connection->disableQueryStatementCaching();
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}
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} catch(\Doctrine\DBAL\DBALException $e) {
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OC_Log::write('core', $e->getMessage(), OC_Log::FATAL);
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OC_User::setUserId(null);
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// send http status 503
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header('HTTP/1.1 503 Service Temporarily Unavailable');
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header('Status: 503 Service Temporarily Unavailable');
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OC_Template::printErrorPage('Failed to connect to database');
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die();
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}
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}
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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 string $query Query string
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* @param int $limit
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* @param int $offset
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* @param bool $isManipulation
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* @throws DatabaseException
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* @return \Doctrine\DBAL\Statement prepared SQL query
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*
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* SQL query via Doctrine prepare(), needs to be execute()'d!
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*/
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static public function prepare( $query , $limit = null, $offset = null, $isManipulation = null) {
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if (!is_null($limit) && $limit != -1) {
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if ($limit === -1) {
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$limit = null;
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}
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$platform = self::$connection->getDatabasePlatform();
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$query = $platform->modifyLimitQuery($query, $limit, $offset);
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}
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}
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// Optimize the query
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$query = self::processQuery( $query );
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if(OC_Config::getValue( "log_query", false)) {
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OC_Log::write('core', 'DB prepare : '.$query, OC_Log::DEBUG);
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}
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self::connect();
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if ($isManipulation === null) {
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//try to guess, so we return the number of rows on manipulations
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$isManipulation = self::isManipulation($query);
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}
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// return the result
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if (self::$backend == self::BACKEND_DOCTRINE) {
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try {
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$result=self::$connection->prepare($query);
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} catch(\Doctrine\DBAL\DBALException $e) {
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throw new \DatabaseException($e->getMessage(), $query);
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}
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// differentiate between query and manipulation
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$result=new OC_DB_StatementWrapper($result, $isManipulation);
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}
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return $result;
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}
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/**
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* tries to guess the type of statement based on the first 10 characters
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* the current check allows some whitespace but does not work with IF EXISTS or other more complex statements
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*
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* @param string $sql
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*/
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static public function isManipulation( $sql ) {
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$selectOccurence = stripos ($sql, "SELECT");
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if ($selectOccurence !== false && $selectOccurence < 10) {
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return false;
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}
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$insertOccurence = stripos ($sql, "INSERT");
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if ($insertOccurence !== false && $insertOccurence < 10) {
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return true;
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}
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$updateOccurence = stripos ($sql, "UPDATE");
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if ($updateOccurence !== false && $updateOccurence < 10) {
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return true;
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}
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$deleteOccurance = stripos ($sql, "DELETE");
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if ($deleteOccurance !== false && $deleteOccurance < 10) {
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return true;
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}
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return false;
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}
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/**
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* @brief execute a prepared statement, on error write log and throw exception
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* @param mixed $stmt OC_DB_StatementWrapper,
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* an array with 'sql' and optionally 'limit' and 'offset' keys
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* .. or a simple sql query string
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* @param array $parameters
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* @return result
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* @throws DatabaseException
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*/
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static public function executeAudited( $stmt, array $parameters = null) {
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if (is_string($stmt)) {
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// convert to an array with 'sql'
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if (stripos($stmt,'LIMIT') !== false) { //OFFSET requires LIMIT, se we only neet to check for LIMIT
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// TODO try to convert LIMIT OFFSET notation to parameters, see fixLimitClauseForMSSQL
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$message = 'LIMIT and OFFSET are forbidden for portability reasons,'
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. ' pass an array with \'limit\' and \'offset\' instead';
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throw new DatabaseException($message);
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}
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$stmt = array('sql' => $stmt, 'limit' => null, 'offset' => null);
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}
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if (is_array($stmt)){
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// convert to prepared statement
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if ( ! array_key_exists('sql', $stmt) ) {
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$message = 'statement array must at least contain key \'sql\'';
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throw new DatabaseException($message);
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}
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if ( ! array_key_exists('limit', $stmt) ) {
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$stmt['limit'] = null;
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}
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if ( ! array_key_exists('limit', $stmt) ) {
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$stmt['offset'] = null;
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}
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$stmt = self::prepare($stmt['sql'], $stmt['limit'], $stmt['offset']);
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}
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self::raiseExceptionOnError($stmt, 'Could not prepare statement');
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if ($stmt instanceof OC_DB_StatementWrapper) {
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$result = $stmt->execute($parameters);
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self::raiseExceptionOnError($result, 'Could not execute statement');
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} else {
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if (is_object($stmt)) {
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$message = 'Expected a prepared statement or array got ' . get_class($stmt);
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} else {
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$message = 'Expected a prepared statement or array got ' . gettype($stmt);
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}
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throw new DatabaseException($message);
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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 string $table The optional table name (will replace *PREFIX*) and add sequence suffix
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* @return int id
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* @throws DatabaseException
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*
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* \Doctrine\DBAL\Connection lastInsertId
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*
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* Call this method right after the insert command or other functions may
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* cause trouble!
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*/
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public static function insertid($table=null) {
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self::connect();
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return self::$connection->lastInsertId($table);
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}
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/**
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* @brief Disconnect
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* @return bool
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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::$connection) {
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self::$connection->close();
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}
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return true;
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}
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/** else {
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* @brief saves database scheme to xml file
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* @param string $file name of file
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* @param int $mode
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* @return bool
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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, $mode=MDB2_SCHEMA_DUMP_STRUCTURE) {
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self::connectDoctrine();
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return OC_DB_Schema::getDbStructure(self::$DOCTRINE, $file);
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}
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/**
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* @brief Creates tables from XML file
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* @param string $file file to read structure from
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* @return bool
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*
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* TODO: write more documentation
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*/
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public static function createDbFromStructure( $file ) {
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self::connectDoctrine();
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return OC_DB_Schema::createDbFromStructure(self::$DOCTRINE, $file);
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}
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/**
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* @brief update the database scheme
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* @param string $file file to read structure from
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* @throws Exception
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* @return bool
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*/
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public static function updateDbFromStructure($file) {
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self::connectDoctrine();
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try {
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$result = OC_DB_Schema::updateDbFromStructure(self::$DOCTRINE, $file);
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} catch (Exception $e) {
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OC_Log::write('core', 'Failed to update database structure ('.$e.')', OC_Log::FATAL);
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throw $e;
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}
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return $result;
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}
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/**
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* @brief Insert a row if a matching row doesn't exists.
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* @param string $table. The table to insert into in the form '*PREFIX*tableName'
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* @param array $input. An array of fieldname/value pairs
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* @returns int number of updated rows
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*/
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public static function insertIfNotExist($table, $input) {
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self::connect();
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$table = self::$connection->replaceTablePrefix( $table );
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if(is_null(self::$type)) {
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self::$type=OC_Config::getValue( "dbtype", "sqlite" );
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}
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$type = self::$type;
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$query = '';
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$inserts = array_values($input);
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// differences in escaping of table names ('`' for mysql) and getting the current timestamp
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if( $type == 'sqlite' || $type == 'sqlite3' ) {
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// NOTE: For SQLite we have to use this clumsy approach
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// otherwise all fieldnames used must have a unique key.
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$query = 'SELECT * FROM `' . $table . '` WHERE ';
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foreach($input as $key => $value) {
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$query .= '`' . $key . '` = ? AND ';
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}
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$query = substr($query, 0, strlen($query) - 5);
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try {
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$result = self::executeAudited($query, $inserts);
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} catch(DatabaseException $e) {
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OC_Template::printExceptionErrorPage( $e );
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}
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if((int)$result->numRows() === 0) {
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$query = 'INSERT INTO `' . $table . '` (`'
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. implode('`,`', array_keys($input)) . '`) VALUES('
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. str_repeat('?,', count($input)-1).'? ' . ')';
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} else {
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return 0; //no rows updated
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}
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} elseif( $type == 'pgsql' || $type == 'oci' || $type == 'mysql' || $type == 'mssql') {
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$query = 'INSERT INTO `' .$table . '` (`'
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. implode('`,`', array_keys($input)) . '`) SELECT '
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. str_repeat('?,', count($input)-1).'? ' // Is there a prettier alternative?
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. 'FROM `' . $table . '` WHERE ';
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foreach($input as $key => $value) {
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$query .= '`' . $key . '` = ? AND ';
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}
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$query = substr($query, 0, strlen($query) - 5);
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$query .= ' HAVING COUNT(*) = 0';
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$inserts = array_merge($inserts, $inserts);
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}
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try {
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$result = self::executeAudited($query, $inserts);
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} catch(\Doctrine\DBAL\DBALException $e) {
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OC_Template::printExceptionErrorPage( $e );
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}
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return $result;
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}
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/**
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* @brief does minor changes to query
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* @param string $query Query string
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* @return string 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 ` with ' or " according to the database driver.
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*/
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private static function processQuery( $query ) {
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self::connect();
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// We need Database type
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if(is_null(self::$type)) {
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self::$type=OC_Config::getValue( "dbtype", "sqlite" );
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}
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$type = self::$type;
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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_ireplace( 'NOW()', 'datetime(\'now\')', $query );
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$query = str_ireplace( 'UNIX_TIMESTAMP()', 'strftime(\'%s\',\'now\')', $query );
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} elseif( $type == 'pgsql' ) {
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$query = str_replace( '`', '"', $query );
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$query = str_ireplace( 'UNIX_TIMESTAMP()', 'cast(extract(epoch from current_timestamp) as integer)',
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$query );
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} elseif( $type == 'oci' ) {
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$query = str_replace( '`', '"', $query );
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$query = str_ireplace( 'NOW()', 'CURRENT_TIMESTAMP', $query );
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$query = str_ireplace( 'UNIX_TIMESTAMP()', "(cast(sys_extract_utc(systimestamp) as date) - date'1970-01-01') * 86400", $query );
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}elseif( $type == 'mssql' ) {
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$query = preg_replace( "/\`(.*?)`/", "[$1]", $query );
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$query = str_ireplace( 'NOW()', 'CURRENT_TIMESTAMP', $query );
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$query = str_replace( 'LENGTH(', 'LEN(', $query );
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$query = str_replace( 'SUBSTR(', 'SUBSTRING(', $query );
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$query = str_ireplace( 'UNIX_TIMESTAMP()', 'DATEDIFF(second,{d \'1970-01-01\'},GETDATE())', $query );
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$query = self::fixLimitClauseForMSSQL($query);
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}
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return $query;
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}
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private static function fixLimitClauseForMSSQL($query) {
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$limitLocation = stripos ($query, "LIMIT");
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if ( $limitLocation === false ) {
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return $query;
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}
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// total == 0 means all results - not zero results
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|
//
|
|
// First number is either total or offset, locate it by first space
|
|
//
|
|
$offset = substr ($query, $limitLocation + 5);
|
|
$offset = substr ($offset, 0, stripos ($offset, ' '));
|
|
$offset = trim ($offset);
|
|
|
|
// check for another parameter
|
|
if (stripos ($offset, ',') === false) {
|
|
// no more parameters
|
|
$offset = 0;
|
|
$total = intval ($offset);
|
|
} else {
|
|
// found another parameter
|
|
$offset = intval ($offset);
|
|
|
|
$total = substr ($query, $limitLocation + 5);
|
|
$total = substr ($total, stripos ($total, ','));
|
|
|
|
$total = substr ($total, 0, stripos ($total, ' '));
|
|
$total = intval ($total);
|
|
}
|
|
|
|
$query = trim (substr ($query, 0, $limitLocation));
|
|
|
|
if ($offset == 0 && $total !== 0) {
|
|
if (strpos($query, "SELECT") === false) {
|
|
$query = "TOP {$total} " . $query;
|
|
} else {
|
|
$query = preg_replace('/SELECT(\s*DISTINCT)?/Dsi', 'SELECT$1 TOP '.$total, $query);
|
|
}
|
|
} else if ($offset > 0) {
|
|
$query = preg_replace('/SELECT(\s*DISTINCT)?/Dsi', 'SELECT$1 TOP(10000000) ', $query);
|
|
$query = 'SELECT *
|
|
FROM (SELECT sub2.*, ROW_NUMBER() OVER(ORDER BY sub2.line2) AS line3
|
|
FROM (SELECT 1 AS line2, sub1.* FROM (' . $query . ') AS sub1) as sub2) AS sub3';
|
|
|
|
if ($total > 0) {
|
|
$query .= ' WHERE line3 BETWEEN ' . ($offset + 1) . ' AND ' . ($offset + $total);
|
|
} else {
|
|
$query .= ' WHERE line3 > ' . $offset;
|
|
}
|
|
}
|
|
return $query;
|
|
}
|
|
|
|
/**
|
|
* @brief drop a table
|
|
* @param string $tableName the table to drop
|
|
*/
|
|
public static function dropTable($tableName) {
|
|
self::connectDoctrine();
|
|
OC_DB_Schema::dropTable(self::$DOCTRINE, $tableName);
|
|
}
|
|
|
|
/**
|
|
* remove all tables defined in a database structure xml file
|
|
* @param string $file the xml file describing the tables
|
|
*/
|
|
public static function removeDBStructure($file) {
|
|
self::connectDoctrine();
|
|
OC_DB_Schema::removeDBStructure(self::$DOCTRINE, $file);
|
|
}
|
|
|
|
/**
|
|
* @brief replaces the ownCloud tables with a new set
|
|
* @param $file string path to the MDB2 xml db export file
|
|
*/
|
|
public static function replaceDB( $file ) {
|
|
self::connectDoctrine();
|
|
OC_DB_Schema::replaceDB(self::$DOCTRINE, $file);
|
|
}
|
|
|
|
/**
|
|
* Start a transaction
|
|
* @return bool
|
|
*/
|
|
public static function beginTransaction() {
|
|
self::connect();
|
|
self::$connection->beginTransaction();
|
|
self::$inTransaction=true;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Commit the database changes done during a transaction that is in progress
|
|
* @return bool
|
|
*/
|
|
public static function commit() {
|
|
self::connect();
|
|
if(!self::$inTransaction) {
|
|
return false;
|
|
}
|
|
self::$connection->commit();
|
|
self::$inTransaction=false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* check if a result is an error, works with Doctrine
|
|
* @param mixed $result
|
|
* @return bool
|
|
*/
|
|
public static function isError($result) {
|
|
//Doctrine returns false on error (and throws an exception)
|
|
return $result === false;
|
|
}
|
|
/**
|
|
* check if a result is an error and throws an exception, works with \Doctrine\DBAL\DBALException
|
|
* @param mixed $result
|
|
* @param string $message
|
|
* @return void
|
|
* @throws DatabaseException
|
|
*/
|
|
public static function raiseExceptionOnError($result, $message = null) {
|
|
if(self::isError($result)) {
|
|
if ($message === null) {
|
|
$message = self::getErrorMessage($result);
|
|
} else {
|
|
$message .= ', Root cause:' . self::getErrorMessage($result);
|
|
}
|
|
throw new DatabaseException($message, self::getErrorCode($result));
|
|
}
|
|
}
|
|
|
|
public static function getErrorCode($error) {
|
|
$code = self::$connection->errorCode();
|
|
return $code;
|
|
}
|
|
/**
|
|
* returns the error code and message as a string for logging
|
|
* works with DoctrineException
|
|
* @param mixed $error
|
|
* @return string
|
|
*/
|
|
public static function getErrorMessage($error) {
|
|
if (self::$backend==self::BACKEND_DOCTRINE and self::$DOCTRINE) {
|
|
$msg = self::$DOCTRINE->errorCode() . ': ';
|
|
$errorInfo = self::$DOCTRINE->errorInfo();
|
|
if (is_array($errorInfo)) {
|
|
$msg .= 'SQLSTATE = '.$errorInfo[0] . ', ';
|
|
$msg .= 'Driver Code = '.$errorInfo[1] . ', ';
|
|
$msg .= 'Driver Message = '.$errorInfo[2];
|
|
}
|
|
return $msg;
|
|
}
|
|
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* @param bool $enabled
|
|
*/
|
|
static public function enableCaching($enabled) {
|
|
if ($enabled) {
|
|
self::$connection->enableQueryStatementCaching();
|
|
} else {
|
|
self::$connection->disableQueryStatementCaching();
|
|
}
|
|
}
|
|
}
|