nextcloud/lib/private/db.php

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<?php
/**
* ownCloud
*
* @author Frank Karlitschek
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* @copyright 2012 Frank Karlitschek frank@owncloud.org
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*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
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define('MDB2_SCHEMA_DUMP_STRUCTURE', '1');
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class DatabaseException extends Exception {
private $query;
//FIXME getQuery seems to be unused, maybe use parent constructor with $message, $code and $previous
public function __construct($message, $query = null){
parent::__construct($message);
$this->query = $query;
}
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public function getQuery() {
return $this->query;
}
}
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/**
* This class manages the access to the database. It basically is a wrapper for
* Doctrine with some adaptions.
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*/
class OC_DB {
/**
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* @var \OC\DB\Connection $connection
*/
static private $connection; //the preferred connection to use, only Doctrine
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static private $prefix=null;
static private $type=null;
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/**
* connects to the database
* @return boolean|null true if connection can be established or false on error
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*
* Connects to the database as specified in config.php
*/
public static function connect() {
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if(self::$connection) {
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" );
$host = OC_Config::getValue( "dbhost", "" );
$user = OC_Config::getValue( "dbuser", "" );
$pass = OC_Config::getValue( "dbpassword", "" );
$type = OC_Config::getValue( "dbtype", "sqlite" );
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if(strpos($host, ':')) {
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list($host, $port)=explode(':', $host, 2);
} else {
$port=false;
}
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$factory = new \OC\DB\ConnectionFactory();
if (!$factory->isValidType($type)) {
return false;
}
if ($factory->normalizeType($type) === 'sqlite3') {
$datadir = OC_Config::getValue("datadirectory", OC::$SERVERROOT.'/data');
$connectionParams = array(
'user' => $user,
'password' => $pass,
'path' => $datadir.'/'.$name.'.db',
);
} else {
$connectionParams = array(
'user' => $user,
'password' => $pass,
'host' => $host,
'dbname' => $name,
);
if (!empty($port)) {
$connectionParams['port'] = $port;
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}
}
$connectionParams['tablePrefix'] = OC_Config::getValue('dbtableprefix', 'oc_');
try {
self::$connection = $factory->getConnection($type, $connectionParams);
} catch(\Doctrine\DBAL\DBALException $e) {
OC_Log::write('core', $e->getMessage(), OC_Log::FATAL);
OC_User::setUserId(null);
// send http status 503
header('HTTP/1.1 503 Service Temporarily Unavailable');
header('Status: 503 Service Temporarily Unavailable');
OC_Template::printErrorPage('Failed to connect to database');
die();
}
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return true;
}
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/**
* @return \OC\DB\Connection
*/
static public function getConnection() {
self::connect();
return self::$connection;
}
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/**
* get MDB2 schema manager
*
* @return \OC\DB\MDB2SchemaManager
*/
private static function getMDB2SchemaManager()
{
return new \OC\DB\MDB2SchemaManager(self::getConnection());
}
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/**
* Prepare a SQL query
* @param string $query Query string
* @param int $limit
* @param int $offset
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* @param bool $isManipulation
* @throws DatabaseException
* @return OC_DB_StatementWrapper prepared SQL query
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*
* SQL query via Doctrine prepare(), needs to be execute()'d!
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*/
static public function prepare( $query , $limit = null, $offset = null, $isManipulation = null) {
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self::connect();
if ($isManipulation === null) {
//try to guess, so we return the number of rows on manipulations
$isManipulation = self::isManipulation($query);
}
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// return the result
try {
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$result = self::$connection->prepare($query, $limit, $offset);
} catch (\Doctrine\DBAL\DBALException $e) {
throw new \DatabaseException($e->getMessage(), $query);
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}
// differentiate between query and manipulation
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$result = new OC_DB_StatementWrapper($result, $isManipulation);
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return $result;
}
/**
* tries to guess the type of statement based on the first 10 characters
* the current check allows some whitespace but does not work with IF EXISTS or other more complex statements
*
* @param string $sql
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* @return bool
*/
static public function isManipulation( $sql ) {
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$selectOccurrence = stripos($sql, 'SELECT');
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if ($selectOccurrence !== false && $selectOccurrence < 10) {
return false;
}
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$insertOccurrence = stripos($sql, 'INSERT');
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if ($insertOccurrence !== false && $insertOccurrence < 10) {
return true;
}
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$updateOccurrence = stripos($sql, 'UPDATE');
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if ($updateOccurrence !== false && $updateOccurrence < 10) {
return true;
}
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$deleteOccurrence = stripos($sql, 'DELETE');
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if ($deleteOccurrence !== false && $deleteOccurrence < 10) {
return true;
}
return false;
}
/**
* execute a prepared statement, on error write log and throw exception
* @param mixed $stmt OC_DB_StatementWrapper,
* an array with 'sql' and optionally 'limit' and 'offset' keys
* .. or a simple sql query string
* @param array $parameters
* @return OC_DB_StatementWrapper
* @throws DatabaseException
*/
static public function executeAudited( $stmt, array $parameters = null) {
if (is_string($stmt)) {
// 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
// TODO try to convert LIMIT OFFSET notation to parameters, see fixLimitClauseForMSSQL
$message = 'LIMIT and OFFSET are forbidden for portability reasons,'
. ' pass an array with \'limit\' and \'offset\' instead';
throw new DatabaseException($message);
}
$stmt = array('sql' => $stmt, 'limit' => null, 'offset' => null);
}
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if (is_array($stmt)) {
// convert to prepared statement
if ( ! array_key_exists('sql', $stmt) ) {
$message = 'statement array must at least contain key \'sql\'';
throw new DatabaseException($message);
}
if ( ! array_key_exists('limit', $stmt) ) {
$stmt['limit'] = null;
}
if ( ! array_key_exists('limit', $stmt) ) {
$stmt['offset'] = null;
}
$stmt = self::prepare($stmt['sql'], $stmt['limit'], $stmt['offset']);
}
self::raiseExceptionOnError($stmt, 'Could not prepare statement');
if ($stmt instanceof OC_DB_StatementWrapper) {
$result = $stmt->execute($parameters);
self::raiseExceptionOnError($result, 'Could not execute statement');
} else {
if (is_object($stmt)) {
$message = 'Expected a prepared statement or array got ' . get_class($stmt);
} else {
$message = 'Expected a prepared statement or array got ' . gettype($stmt);
}
throw new DatabaseException($message);
}
return $result;
}
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/**
* gets last value of autoincrement
* @param string $table The optional table name (will replace *PREFIX*) and add sequence suffix
* @return string id
* @throws DatabaseException
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*
* \Doctrine\DBAL\Connection lastInsertId
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*
* Call this method right after the insert command or other functions may
* cause trouble!
*/
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public static function insertid($table=null) {
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self::connect();
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return self::$connection->lastInsertId($table);
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}
/**
* Insert a row if a matching row doesn't exists.
* @param string $table The table to insert into in the form '*PREFIX*tableName'
* @param array $input An array of fieldname/value pairs
* @return boolean number of updated rows
*/
public static function insertIfNotExist($table, $input) {
self::connect();
return self::$connection->insertIfNotExist($table, $input);
}
/**
* Start a transaction
*/
public static function beginTransaction() {
self::connect();
self::$connection->beginTransaction();
}
/**
* Commit the database changes done during a transaction that is in progress
*/
public static function commit() {
self::connect();
self::$connection->commit();
}
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/**
* saves database schema to xml file
* @param string $file name of file
* @param int $mode
* @return bool
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*
* TODO: write more documentation
*/
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public static function getDbStructure( $file, $mode = 0) {
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$schemaManager = self::getMDB2SchemaManager();
return $schemaManager->getDbStructure($file);
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}
/**
* Creates tables from XML file
* @param string $file file to read structure from
* @return bool
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*
* TODO: write more documentation
*/
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public static function createDbFromStructure( $file ) {
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$schemaManager = self::getMDB2SchemaManager();
$result = $schemaManager->createDbFromStructure($file);
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return $result;
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}
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/**
* update the database schema
* @param string $file file to read structure from
* @throws Exception
* @return string|boolean
*/
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public static function updateDbFromStructure($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 $e) {
OC_Log::write('core', 'Failed to update database structure ('.$e.')', OC_Log::FATAL);
throw $e;
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}
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return $result;
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}
/**
* drop a table
* @param string $tableName the table to drop
*/
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public static function dropTable($tableName) {
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$schemaManager = self::getMDB2SchemaManager();
$schemaManager->dropTable($tableName);
}
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/**
* remove all tables defined in a database structure xml file
* @param string $file the xml file describing the tables
*/
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public static function removeDBStructure($file) {
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$schemaManager = self::getMDB2SchemaManager();
$schemaManager->removeDBStructure($file);
}
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/**
* replaces the ownCloud tables with a new set
* @param string $file path to the MDB2 xml db export file
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*/
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public static function replaceDB( $file ) {
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$schemaManager = self::getMDB2SchemaManager();
$schemaManager->replaceDB($file);
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}
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/**
* check if a result is an error, works with Doctrine
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* @param mixed $result
* @return bool
*/
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public static function isError($result) {
//Doctrine returns false on error (and throws an exception)
return $result === false;
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}
/**
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* check if a result is an error and throws an exception, works with \Doctrine\DBAL\DBALException
* @param mixed $result
* @param string $message
* @return void
* @throws DatabaseException
*/
public static function raiseExceptionOnError($result, $message = null) {
if(self::isError($result)) {
if ($message === null) {
$message = self::getErrorMessage($result);
} else {
$message .= ', Root cause:' . self::getErrorMessage($result);
}
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throw new DatabaseException($message, self::getErrorCode($result));
}
}
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public static function getErrorCode($error) {
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$code = self::$connection->errorCode();
return $code;
}
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/**
* returns the error code and message as a string for logging
* works with DoctrineException
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* @param mixed $error
* @return string
*/
public static function getErrorMessage($error) {
if (self::$connection) {
return self::$connection->getError();
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}
return '';
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}
/**
* @param bool $enabled
*/
static public function enableCaching($enabled) {
if ($enabled) {
self::$connection->enableQueryStatementCaching();
} else {
self::$connection->disableQueryStatementCaching();
}
}
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}