/**
* @return void
*/
public function beginTransaction()
{
++$this->transactions;
if ($this->transactions == 1) {
$this->pdo->beginTransaction();
} elseif ($this->transactions > 1 && $this->queryGrammar->supportsSavepoints()) {
$this->pdo->exec($this->queryGrammar->compileSavepoint('trans' . $this->transactions));
}
$this->fireConnectionEvent('beganTransaction');
}
