src/Persist/Connection/MySql.php
function commitTransaction(){
		$this->log("COMMIT SAVE_POINT_".$this->transactionCount);
		$this->transactionCount--;
		if($this->transactionCount == 0){
			parent::commit();
			$this->log("COMMIT REAL");
		}
		return $this->transactionCount;
	}
function commitTransaction(){
		$this->log("COMMIT SAVE_POINT_".$this->transactionCount);
		$this->transactionCount--;
		if($this->transactionCount == 0){
			parent::commit();
			$this->log("COMMIT REAL");
		}
		return $this->transactionCount;
	}
commits the last transaction

@return integer , number of live transactions after executing this method