<?php

namespace Ulmus\Common\PdoObject;

class SqlPdoObject extends \Ulmus\Common\PdoObject
{
    protected int $openedTransaction = 0;

    public function beginTransaction(): bool
    {
        if ( 0 === ++$this->openedTransaction ) {
            return parent::beginTransaction();
        }

        return $this->exec('SAVEPOINT transaction_'.$this->openedTransaction) !== false;
    }

    public function commit() : bool
    {
        if ( 0 === --$this->openedTransaction) {
            return parent::commit();
        }

        return false;
    }

    public function rollback() : bool
    {
        if (0 !== $this->openedTransaction) {
            return $this->exec('ROLLBACK TO transaction_' . $this->openedTransaction--) !== false;
        }

        return parent::rollback();
    }
}