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246 lines
7.6 KiB
246 lines
7.6 KiB
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Andreas Fischer <bantu@owncloud.com>
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* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
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* @author Bart Visscher <bartv@thisnet.nl>
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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* @author Vincent Petry <pvince81@owncloud.com>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program 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 License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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use OCP\ILogger;
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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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* 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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return new \OC\DB\MDB2SchemaManager(\OC::$server->getDatabaseConnection());
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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|null $limit
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* @param int|null $offset
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* @param bool|null $isManipulation
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* @throws \OC\DatabaseException
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* @return OC_DB_StatementWrapper prepared SQL query
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*
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* SQL query via Doctrine prepare(), needs to be execute()'d!
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*/
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public static function prepare($query , $limit = null, $offset = null, $isManipulation = null) {
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$connection = \OC::$server->getDatabaseConnection();
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if ($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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$result =$connection->prepare($query, $limit, $offset);
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} catch (\Doctrine\DBAL\DBALException $e) {
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throw new \OC\DatabaseException($e->getMessage());
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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 $sql
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* @return bool
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*/
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public static function isManipulation($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 $parameters
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* @return OC_DB_StatementWrapper
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* @throws \OC\DatabaseException
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*/
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public static function executeAudited($stmt, array $parameters = []) {
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if (is_string($stmt)) {
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// convert to an array with 'sql'
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if (stripos($stmt, 'LIMIT') !== false) { //OFFSET requires LIMIT, so we only need to check for LIMIT
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// TODO try to convert LIMIT OFFSET notation to parameters
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$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 \OC\DatabaseException($message);
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}
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$stmt = ['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 \OC\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 \OC\DatabaseException($message);
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}
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return $result;
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}
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/**
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* saves database schema to xml file
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* @param string $file name of file
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* @return bool
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*
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* TODO: write more documentation
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*/
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public static function getDbStructure($file) {
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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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return $schemaManager->createDbFromStructure($file);
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}
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/**
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* update the database schema
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* @param string $file file to read structure from
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* @throws Exception
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* @return string|boolean
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* @suppress PhanDeprecatedFunction
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*/
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public static function updateDbFromStructure($file) {
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$schemaManager = self::getMDB2SchemaManager();
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try {
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$result = $schemaManager->updateDbFromStructure($file);
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} catch (Exception $e) {
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\OCP\Util::writeLog('core', 'Failed to update database structure ('.$e.')', ILogger::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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* 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 and throws an exception, works with \Doctrine\DBAL\DBALException
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* @param mixed $result
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* @param string $message
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* @return void
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* @throws \OC\DatabaseException
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*/
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public static function raiseExceptionOnError($result, $message = null) {
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if ($result === false) {
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if ($message === null) {
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$message = self::getErrorMessage();
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} else {
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$message .= ', Root cause:' . self::getErrorMessage();
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}
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throw new \OC\DatabaseException($message);
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}
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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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* @return string
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*/
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public static function getErrorMessage() {
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$connection = \OC::$server->getDatabaseConnection();
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return $connection->getError();
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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 $table
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* @return bool
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* @throws \OC\DatabaseException
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*/
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public static function tableExists($table) {
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$connection = \OC::$server->getDatabaseConnection();
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return $connection->tableExists($table);
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}
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}
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