459 lines
13 KiB
PHP
459 lines
13 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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/**
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* @var \OC\DB\Connection $connection
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*/
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static private $connection; //the preferred connection to use, only Doctrine
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/**
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* connects to the database
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* @return boolean|null true if connection can be established or false on error
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*
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* Connects to the database as specified in config.php
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*/
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public static function connect() {
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if(self::$connection) {
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return true;
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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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$factory = new \OC\DB\ConnectionFactory();
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if (!$factory->isValidType($type)) {
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return false;
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}
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if ($factory->normalizeType($type) === 'sqlite3') {
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$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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);
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} else {
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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' => $name,
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);
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if (!empty($port)) {
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$connectionParams['port'] = $port;
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}
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}
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$connectionParams['tablePrefix'] = OC_Config::getValue('dbtableprefix', 'oc_');
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try {
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self::$connection = $factory->getConnection($type, $connectionParams);
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} catch(\Doctrine\DBAL\DBALException $e) {
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OC_Log::write('core', $e->getMessage(), OC_Log::FATAL);
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OC_User::setUserId(null);
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// send http status 503
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header('HTTP/1.1 503 Service Temporarily Unavailable');
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header('Status: 503 Service Temporarily Unavailable');
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OC_Template::printErrorPage('Failed to connect to database');
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die();
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}
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return true;
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}
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/**
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* @return \OC\DB\Connection
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*/
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static public function getConnection() {
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self::connect();
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return self::$connection;
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}
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/**
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* get MDB2 schema manager
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*
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* @return \OC\DB\MDB2SchemaManager
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*/
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private static function getMDB2SchemaManager()
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{
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return new \OC\DB\MDB2SchemaManager(self::getConnection());
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}
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/**
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* 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 OC_DB_StatementWrapper 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, $isManipulation = null) {
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self::connect();
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if ($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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try {
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$result = self::$connection->prepare($query, $limit, $offset);
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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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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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* @return bool
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*/
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static public function isManipulation( $sql ) {
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$selectOccurrence = stripos($sql, 'SELECT');
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if ($selectOccurrence !== false && $selectOccurrence < 10) {
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return false;
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}
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$insertOccurrence = stripos($sql, 'INSERT');
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if ($insertOccurrence !== false && $insertOccurrence < 10) {
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return true;
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}
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$updateOccurrence = stripos($sql, 'UPDATE');
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if ($updateOccurrence !== false && $updateOccurrence < 10) {
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return true;
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}
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$deleteOccurrence = stripos($sql, 'DELETE');
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if ($deleteOccurrence !== false && $deleteOccurrence < 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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* 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 OC_DB_StatementWrapper
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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($stmt, 'LIMIT') !== false) { //OFFSET requires LIMIT, so we only need to check for LIMIT
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// TODO try to convert LIMIT OFFSET notation to parameters, see fixLimitClauseForMSSQL
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$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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* gets last value of autoincrement
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* @param string $table The optional table name (will replace *PREFIX*) and add sequence suffix
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* @return string id
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* @throws DatabaseException
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*
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* \Doctrine\DBAL\Connection lastInsertId
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*
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* Call this method right after the insert command or other functions may
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* cause trouble!
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*/
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public static function insertid($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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* 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 $input An array of fieldname/value pairs
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* @return boolean number of updated rows
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*/
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public static function insertIfNotExist($table, $input) {
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self::connect();
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return self::$connection->insertIfNotExist($table, $input);
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}
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/**
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* Start a transaction
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*/
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public static function beginTransaction() {
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self::connect();
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self::$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() {
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self::connect();
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self::$connection->commit();
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}
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/**
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* saves database schema 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, $mode = 0) {
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$schemaManager = self::getMDB2SchemaManager();
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return $schemaManager->getDbStructure($file);
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}
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/**
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* 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( $file ) {
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$schemaManager = self::getMDB2SchemaManager();
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$result = $schemaManager->createDbFromStructure($file);
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return $result;
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}
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/**
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* update the database schema
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* @param string $file file to read structure from
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* @param bool $simulate whether to simulate the upgrade on separate tables
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* @throws Exception
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* @return string|boolean
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*/
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public static function updateDbFromStructure($file, $simulate = false) {
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$schemaManager = self::getMDB2SchemaManager();
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try {
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$result = $schemaManager->updateDbFromStructure($file, false, $simulate);
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} catch (Exception $e) {
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if ($simulate) {
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OC_Log::write('core', 'Database structure update simulation failed ('.$e.')', OC_Log::FATAL);
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}
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else {
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OC_Log::write('core', 'Failed to update database structure ('.$e.')', OC_Log::FATAL);
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}
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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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* drop a table - the database prefix will be prepended
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* @param string $tableName the table to drop
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*/
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public static function dropTable($tableName) {
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$tableName = OC_Config::getValue('dbtableprefix', 'oc_' ) . trim($tableName);
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self::$connection->beginTransaction();
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$platform = self::$connection->getDatabasePlatform();
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$sql = $platform->getDropTableSQL($platform->quoteIdentifier($tableName));
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self::$connection->query($sql);
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self::$connection->commit();
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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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$schemaManager = self::getMDB2SchemaManager();
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$schemaManager->removeDBStructure($file);
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}
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/**
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* check if a result is an error, works with Doctrine
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* @param mixed $result
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* @return bool
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*/
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public static function isError($result) {
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//Doctrine returns false on error (and throws an exception)
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return $result === false;
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}
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/**
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* check if a result is an error and throws an exception, works with \Doctrine\DBAL\DBALException
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* @param mixed $result
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* @param string $message
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* @return void
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* @throws DatabaseException
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*/
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public static function raiseExceptionOnError($result, $message = null) {
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if(self::isError($result)) {
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if ($message === null) {
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$message = self::getErrorMessage($result);
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} else {
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$message .= ', Root cause:' . self::getErrorMessage($result);
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}
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throw new DatabaseException($message, self::getErrorCode($result));
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}
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}
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public static function getErrorCode($error) {
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$code = self::$connection->errorCode();
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return $code;
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}
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/**
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* returns the error code and message as a string for logging
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* works with DoctrineException
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* @param mixed $error
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* @return string
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*/
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public static function getErrorMessage($error) {
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if (self::$connection) {
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return self::$connection->getError();
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}
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return '';
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}
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/**
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* @param bool $enabled
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*/
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static public function enableCaching($enabled) {
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if ($enabled) {
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self::$connection->enableQueryStatementCaching();
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} else {
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self::$connection->disableQueryStatementCaching();
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}
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}
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/**
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* Checks if a table exists in the database - the database prefix will be prepended
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*
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* @param string $table
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* @return bool
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* @throws DatabaseException
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*/
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public static function tableExists($table) {
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$table = OC_Config::getValue('dbtableprefix', 'oc_' ) . trim($table);
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$dbType = OC_Config::getValue( 'dbtype', 'sqlite' );
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switch ($dbType) {
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case 'sqlite':
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case 'sqlite3':
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$sql = "SELECT name FROM sqlite_master "
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. "WHERE type = 'table' AND name = ? "
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. "UNION ALL SELECT name FROM sqlite_temp_master "
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. "WHERE type = 'table' AND name = ?";
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$result = \OC_DB::executeAudited($sql, array($table, $table));
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break;
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case 'mysql':
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$sql = 'SHOW TABLES LIKE ?';
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$result = \OC_DB::executeAudited($sql, array($table));
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break;
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case 'pgsql':
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$sql = 'SELECT tablename AS table_name, schemaname AS schema_name '
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. 'FROM pg_tables WHERE schemaname NOT LIKE \'pg_%\' '
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. 'AND schemaname != \'information_schema\' '
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. 'AND tablename = ?';
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$result = \OC_DB::executeAudited($sql, array($table));
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break;
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case 'oci':
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$sql = 'SELECT TABLE_NAME FROM USER_TABLES WHERE TABLE_NAME = ?';
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$result = \OC_DB::executeAudited($sql, array($table));
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break;
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case 'mssql':
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$sql = 'SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = ?';
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$result = \OC_DB::executeAudited($sql, array($table));
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break;
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default:
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throw new DatabaseException("Unknown database type: $dbType");
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}
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return $result->fetchOne() === $table;
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}
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}
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