717 lines
20 KiB
PHP
717 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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/**
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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 $inTransaction=false;
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static private $prefix=null;
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static private $type=null;
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/**
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* check which backend we should use
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* @return BACKEND_MDB2 or BACKEND_PDO
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*/
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private static function getDBBackend(){
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//check if we can use PDO, else use MDB2 (installation always needs to be done my mdb2)
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if(class_exists('PDO') && OC_Config::getValue('installed', false)) {
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$type = OC_Config::getValue( "dbtype", "sqlite" );
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if($type=='oci') { //oracle also always needs mdb2
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return self::BACKEND_MDB2;
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}
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if($type=='sqlite3') $type='sqlite';
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$drivers=PDO::getAvailableDrivers();
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if(array_search($type, $drivers)!==false) {
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return self::BACKEND_PDO;
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}
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}
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return self::BACKEND_MDB2;
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}
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/**
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* @brief connects to the database
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* @returns true if connection can be established or nothing (die())
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*
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* Connects to the database as specified in config.php
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*/
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public static function connect($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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$backend=self::getDBBackend();
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}
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if($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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$type = OC_Config::getValue( "dbtype", "sqlite" );
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if(strpos($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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$opts = array();
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$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.'/'.$name.'.db';
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break;
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case 'mysql':
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if($port) {
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$dsn='mysql:dbname='.$name.';host='.$host.';port='.$port;
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}else{
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$dsn='mysql:dbname='.$name.';host='.$host;
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}
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$opts[PDO::MYSQL_ATTR_INIT_COMMAND] = "SET NAMES 'UTF8'";
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break;
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case 'pgsql':
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if($port) {
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$dsn='pgsql:dbname='.$name.';host='.$host.';port='.$port;
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}else{
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$dsn='pgsql:dbname='.$name.';host='.$host;
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}
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/**
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* Ugly fix for pg connections pbm when password use spaces
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*/
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$e_user = addslashes($user);
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$e_password = addslashes($pass);
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$pass = $user = null;
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$dsn .= ";user='$e_user';password='$e_password'";
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/** END OF FIX***/
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break;
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case 'oci': // Oracle with PDO is unsupported
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if ($port) {
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$dsn = 'oci:dbname=//' . $host . ':' . $port . '/' . $name;
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} else {
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$dsn = 'oci:dbname=//' . $host . '/' . $name;
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}
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break;
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}
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try{
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self::$PDO=new PDO($dsn, $user, $pass, $opts);
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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 & (!MDB2_PORTABILITY_FIX_CASE),
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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' => $name
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);
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break;
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case 'oci':
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$dsn = array(
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'phptype' => 'oci8',
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'username' => $user,
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'password' => $pass,
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);
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if ($host != '') {
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$dsn['hostspec'] = $host;
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$dsn['database'] = $name;
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} else { // use dbname for hostspec
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$dsn['hostspec'] = $name;
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}
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break;
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}
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// Try to establish connection
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self::$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 , $limit=null, $offset=null ){
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if (!is_null($limit) && $limit != -1) {
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if (self::$backend == self::BACKEND_MDB2) {
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//MDB2 uses or emulates limits & offset internally
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self::$MDB2->setLimit($limit, $offset);
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} else {
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//PDO does not handle limit and offset.
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//FIXME: check limit notation for other dbs
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//the following sql thus might needs to take into account db ways of representing it
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//(oracle has no LIMIT / OFFSET)
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$limitsql = ' LIMIT ' . $limit;
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if (!is_null($offset)) {
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$limitsql .= ' OFFSET ' . $offset;
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}
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//insert limitsql
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if (substr($query, -1) == ';') { //if query ends with ;
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$query = substr($query, 0, -1) . $limitsql . ';';
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} else {
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$query.=$limitsql;
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}
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}
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}
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// Optimize the query
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$query = self::processQuery( $query );
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self::connect();
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// return the result
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if(self::$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', $entry,OC_Log::FATAL);
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error_log('DB error: '.$entry);
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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', $entry,OC_Log::FATAL);
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error_log('DB error: '.$entry);
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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( $file );
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// Make changes and save them to an in-memory file
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$file2 = 'static://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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/* FIXME: REMOVE this commented code
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* actually mysql, postgresql, sqlite and oracle support CURRENT_TIMESTAMP
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* http://dev.mysql.com/doc/refman/5.0/en/timestamp-initialization.html
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* http://www.postgresql.org/docs/8.1/static/functions-datetime.html
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* http://www.sqlite.org/lang_createtable.html
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* http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions037.htm
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*/
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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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//clean up memory
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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')==='oci') {
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unset($definition['charset']); //or MDB2 tries SHUTDOWN IMMEDIATE
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$oldname = $definition['name'];
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$definition['name']=OC_Config::getValue( "dbuser", $oldname );
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}
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$ret=self::$schema->createDatabase( $definition );
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// Die in case something went wrong
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if( $ret instanceof MDB2_Error ) {
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echo (self::$MDB2->getDebugOutput());
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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::$schema->getDefinitionFromDatabase();
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if (PEAR::isError($previousSchema)) {
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$error = $previousSchema->getMessage();
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OC_Log::write('core', 'Failed to get existing database structure for upgrading ('.$error.')', OC_Log::FATAL);
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return false;
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}
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// Make changes and save them to an in-memory file
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$file2 = 'static://db_scheme';
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$content = str_replace( '*dbname*', $previousSchema['name'], $content );
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$content = str_replace( '*dbprefix*', $CONFIG_DBTABLEPREFIX, $content );
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/* FIXME: REMOVE this commented code
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* actually mysql, postgresql, sqlite and oracle support CUURENT_TIMESTAMP
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* http://dev.mysql.com/doc/refman/5.0/en/timestamp-initialization.html
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* http://www.postgresql.org/docs/8.1/static/functions-datetime.html
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* http://www.sqlite.org/lang_createtable.html
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* http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions037.htm
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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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*/
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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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//clean up memory
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unlink( $file2 );
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if (PEAR::isError($op)) {
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$error = $op->getMessage();
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$detail = $op->getDebugInfo();
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OC_Log::write('core', 'Failed to update database structure ('.$error.', '.$detail.')', OC_Log::FATAL);
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return false;
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}
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return true;
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}
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/**
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* @brief connects to a MDB2 database scheme
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* @returns true/false
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*
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* Connects to a MDB2 database scheme
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*/
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private static function connectScheme(){
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// We need a mdb2 database connection
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self::connectMDB2();
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self::$MDB2->loadModule('Manager');
|
|
self::$MDB2->loadModule('Reverse');
|
|
|
|
// Connect if this did not happen before
|
|
if(!self::$schema) {
|
|
require_once 'MDB2/Schema.php';
|
|
self::$schema=MDB2_Schema::factory(self::$MDB2);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief does minor chages to query
|
|
* @param $query Query string
|
|
* @returns corrected query string
|
|
*
|
|
* This function replaces *PREFIX* with the value of $CONFIG_DBTABLEPREFIX
|
|
* and replaces the ` woth ' or " according to the database driver.
|
|
*/
|
|
private static function processQuery( $query ){
|
|
self::connect();
|
|
// We need Database type and table prefix
|
|
if(is_null(self::$type)) {
|
|
self::$type=OC_Config::getValue( "dbtype", "sqlite" );
|
|
}
|
|
$type = self::$type;
|
|
if(is_null(self::$prefix)) {
|
|
self::$prefix=OC_Config::getValue( "dbtableprefix", "oc_" );
|
|
}
|
|
$prefix = self::$prefix;
|
|
|
|
// differences in escaping of table names ('`' for mysql) and getting the current timestamp
|
|
if( $type == 'sqlite' || $type == 'sqlite3' ) {
|
|
$query = str_replace( '`', '"', $query );
|
|
$query = str_ireplace( 'NOW()', 'datetime(\'now\')', $query );
|
|
$query = str_ireplace( 'UNIX_TIMESTAMP()', 'strftime(\'%s\',\'now\')', $query );
|
|
}elseif( $type == 'pgsql' ) {
|
|
$query = str_replace( '`', '"', $query );
|
|
$query = str_ireplace( 'UNIX_TIMESTAMP()', 'cast(extract(epoch from current_timestamp) as integer)', $query );
|
|
}elseif( $type == 'oci' ) {
|
|
$query = str_replace( '`', '"', $query );
|
|
$query = str_ireplace( 'NOW()', 'CURRENT_TIMESTAMP', $query );
|
|
}
|
|
|
|
// replace table name prefix
|
|
$query = str_replace( '*PREFIX*', $prefix, $query );
|
|
|
|
return $query;
|
|
}
|
|
|
|
/**
|
|
* @brief drop a table
|
|
* @param string $tableNamme the table to drop
|
|
*/
|
|
public static function dropTable($tableName){
|
|
self::connectMDB2();
|
|
self::$MDB2->loadModule('Manager');
|
|
self::$MDB2->dropTable($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){
|
|
$CONFIG_DBNAME = OC_Config::getValue( "dbname", "owncloud" );
|
|
$CONFIG_DBTABLEPREFIX = OC_Config::getValue( "dbtableprefix", "oc_" );
|
|
self::connectScheme();
|
|
|
|
// read file
|
|
$content = file_get_contents( $file );
|
|
|
|
// Make changes and save them to a temporary file
|
|
$file2 = tempnam( get_temp_dir(), 'oc_db_scheme_' );
|
|
$content = str_replace( '*dbname*', $CONFIG_DBNAME, $content );
|
|
$content = str_replace( '*dbprefix*', $CONFIG_DBTABLEPREFIX, $content );
|
|
file_put_contents( $file2, $content );
|
|
|
|
// get the tables
|
|
$definition = self::$schema->parseDatabaseDefinitionFile( $file2 );
|
|
|
|
// Delete our temporary file
|
|
unlink( $file2 );
|
|
$tables=array_keys($definition['tables']);
|
|
foreach($tables as $table){
|
|
self::dropTable($table);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @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 ){
|
|
$apps = OC_App::getAllApps();
|
|
self::beginTransaction();
|
|
// Delete the old tables
|
|
self::removeDBStructure( OC::$SERVERROOT . '/db_structure.xml' );
|
|
|
|
foreach($apps as $app){
|
|
$path = OC_App::getAppPath($app).'/appinfo/database.xml';
|
|
if(file_exists($path)) {
|
|
self::removeDBStructure( $path );
|
|
}
|
|
}
|
|
|
|
// Create new tables
|
|
self::createDBFromStructure( $file );
|
|
self::commit();
|
|
}
|
|
|
|
/**
|
|
* Start a transaction
|
|
*/
|
|
public static function beginTransaction(){
|
|
self::connect();
|
|
if (self::$backend==self::BACKEND_MDB2 && !self::$connection->supports('transactions')) {
|
|
return false;
|
|
}
|
|
self::$connection->beginTransaction();
|
|
self::$inTransaction=true;
|
|
}
|
|
|
|
/**
|
|
* Commit the database changes done during a transaction that is in progress
|
|
*/
|
|
public static function commit() {
|
|
self::connect();
|
|
if(!self::$inTransaction) {
|
|
return false;
|
|
}
|
|
self::$connection->commit();
|
|
self::$inTransaction=false;
|
|
}
|
|
|
|
/**
|
|
* check if a result is an error, works with MDB2 and PDOException
|
|
* @param mixed $result
|
|
* @return bool
|
|
*/
|
|
public static function isError($result){
|
|
if(!$result) {
|
|
return true;
|
|
}elseif(self::$backend==self::BACKEND_MDB2 and PEAR::isError($result)){
|
|
return true;
|
|
}else{
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* small wrapper around PDOStatement to make it behave ,more like an MDB2 Statement
|
|
*/
|
|
class PDOStatementWrapper{
|
|
private $statement=null;
|
|
private $lastArguments=array();
|
|
|
|
public function __construct($statement){
|
|
$this->statement=$statement;
|
|
}
|
|
|
|
/**
|
|
* make execute return the result instead of a bool
|
|
*/
|
|
public function execute($input=array()){
|
|
$this->lastArguments=$input;
|
|
if(count($input)>0){
|
|
$result=$this->statement->execute($input);
|
|
}else{
|
|
$result=$this->statement->execute();
|
|
}
|
|
if($result) {
|
|
return $this;
|
|
}else{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}
|