Doctrine\DBAL\Connection::setAutoCommit PHP Method

    public function setAutoCommit($autoCommit)
    {
        $autoCommit = (bool) $autoCommit;
        // Mode not changed, no-op.
        if ($autoCommit === $this->autoCommit) {
            return;
        }
        $this->autoCommit = $autoCommit;
        // Commit all currently active transactions if any when switching auto-commit mode.
        if (true === $this->_isConnected && 0 !== $this->_transactionNestingLevel) {
            $this->commitAll();
        }
    }

 /**
  * Deletes all nodes with edges from database
  *
  * @throws DatabaseErrorException
  */
 public function delete()
 {
     try {
         $this->dbal->setAutoCommit(false);
         $this->dbal->beginTransaction();
         $this->dbal->executeQuery('DELETE FROM relations');
         $this->dbal->executeQuery('DELETE FROM organizations');
         $this->dbal->commit();
         $this->dbal->setAutoCommit(true);
     } catch (\Doctrine\DBAL\ConnectionException $exception) {
         throw new DatabaseErrorException($exception);
     } catch (\Doctrine\DBAL\DBALException $exception) {
         $this->dbal->rollBack();
         $this->dbal->setAutoCommit(true);
         throw new DatabaseErrorException($exception);
     }
 }