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<?php
/**
* @author Bart Visscher <bartv@thisnet.nl>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <icewind@owncloud.com>
* @author Roeland Jago Douma <rullzer@owncloud.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @copyright Copyright (c) 2016, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\DB;
use Doctrine\DBAL\Platforms\MySqlPlatform;
use Doctrine\DBAL\Platforms\OraclePlatform;
use Doctrine\DBAL\Platforms\PostgreSqlPlatform;
use Doctrine\DBAL\Platforms\SqlitePlatform;
use OCP\IDBConnection;
class MDB2SchemaManager {
/** @var \OC\DB\Connection $conn */
protected $conn;
/**
* @param IDBConnection $conn
*/
public function __construct($conn) {
$this->conn = $conn;
}
/**
* saves database scheme to xml file
* @param string $file name of file
* @return bool
*
* TODO: write more documentation
*/
public function getDbStructure($file) {
return \OC\DB\MDB2SchemaWriter::saveSchemaToFile($file, $this->conn);
}
/**
* Creates tables from XML file
* @param string $file file to read structure from
* @return bool
*
* TODO: write more documentation
*/
public function createDbFromStructure($file) {
$schemaReader = new MDB2SchemaReader(\OC::$server->getConfig(), $this->conn->getDatabasePlatform());
$toSchema = $schemaReader->loadSchemaFromFile($file);
return $this->executeSchemaChange($toSchema);
}
/**
* @return \OC\DB\Migrator
*/
public function getMigrator() {
$random = \OC::$server->getSecureRandom();
$platform = $this->conn->getDatabasePlatform();
$config = \OC::$server->getConfig();
$dispatcher = \OC::$server->getEventDispatcher();
if ($platform instanceof SqlitePlatform) {
return new SQLiteMigrator($this->conn, $random, $config, $dispatcher);
} else if ($platform instanceof OraclePlatform) {
return new OracleMigrator($this->conn, $random, $config, $dispatcher);
} else if ($platform instanceof MySqlPlatform) {
return new MySQLMigrator($this->conn, $random, $config, $dispatcher);
} else if ($platform instanceof PostgreSqlPlatform) {
return new Migrator($this->conn, $random, $config, $dispatcher);
} else {
return new NoCheckMigrator($this->conn, $random, $config, $dispatcher);
}
}
/**
* Reads database schema from file
*
* @param string $file file to read from
* @return \Doctrine\DBAL\Schema\Schema
*/
private function readSchemaFromFile($file) {
$platform = $this->conn->getDatabasePlatform();
$schemaReader = new MDB2SchemaReader(\OC::$server->getConfig(), $platform);
return $schemaReader->loadSchemaFromFile($file);
}
/**
* update the database scheme
* @param string $file file to read structure from
* @param bool $generateSql only return the sql needed for the upgrade
* @return string|boolean
*/
public function updateDbFromStructure($file, $generateSql = false) {
$toSchema = $this->readSchemaFromFile($file);
$migrator = $this->getMigrator();
if ($generateSql) {
return $migrator->generateChangeScript($toSchema);
} else {
$migrator->migrate($toSchema);
return true;
}
}
/**
* update the database scheme
* @param string $file file to read structure from
* @return boolean
*/
public function simulateUpdateDbFromStructure($file) {
$toSchema = $this->readSchemaFromFile($file);
$this->getMigrator()->checkMigrate($toSchema);
return true;
}
/**
* @param \Doctrine\DBAL\Schema\Schema $schema
* @return string
*/
public function generateChangeScript($schema) {
$migrator = $this->getMigrator();
return $migrator->generateChangeScript($schema);
}
/**
* remove all tables defined in a database structure xml file
*
* @param string $file the xml file describing the tables
*/
public function removeDBStructure($file) {
$schemaReader = new MDB2SchemaReader(\OC::$server->getConfig(), $this->conn->getDatabasePlatform());
$fromSchema = $schemaReader->loadSchemaFromFile($file);
$toSchema = clone $fromSchema;
/** @var $table \Doctrine\DBAL\Schema\Table */
foreach ($toSchema->getTables() as $table) {
$toSchema->dropTable($table->getName());
}
$comparator = new \Doctrine\DBAL\Schema\Comparator();
$schemaDiff = $comparator->compare($fromSchema, $toSchema);
$this->executeSchemaChange($schemaDiff);
}
/**
* @param \Doctrine\DBAL\Schema\Schema|\Doctrine\DBAL\Schema\SchemaDiff $schema
* @return bool
*/
private function executeSchemaChange($schema) {
$this->conn->beginTransaction();
foreach ($schema->toSql($this->conn->getDatabasePlatform()) as $sql) {
$this->conn->query($sql);
}
$this->conn->commit();
if ($this->conn->getDatabasePlatform() instanceof SqlitePlatform) {
$this->conn->close();
$this->conn->connect();
}
return true;
}
}
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