protected function after() {
		if($this->connection->getDatabasePlatform() instanceof SQLServerPlatform) {
			$this->connection->executeUpdate('exec sp_msforeachtable "ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all"');
		} else if($this->connection->getDatabasePlatform() instanceof MySqlPlatform) {
			$this->connection->executeUpdate('SET FOREIGN_KEY_CHECKS=1');
		} else if($this->connection->getDatabasePlatform() instanceof SqlitePlatform) {
			$this->connection->executeUpdate('PRAGMA foreign_keys = ON');
		}
	}