Nette\Database\Connection::rollBack PHP Method

    public function rollBack()
    {
        $this->query('::rollBack');
    }

 /** @return void */
 public function rollback()
 {
     if (self::$transactionCounter[$dsn = $this->getDsnKey()] !== 0) {
         $this->connection->rollBack();
     }
     self::$transactionCounter[$dsn] = 0;
 }