Driver_Database_Driver_MySQLI_Transaction::commit

public function commit()
{
    if (!$this->id || ! $this->_haveid()) return false;

    if ($this->is_root())
    {
        # 父事务
        while (count(Database_Driver_MySQLI_Transaction::$transactions[$this->_connection_id]) > 1)
        {
            # 还有没有提交的子事务
            end(Database_Driver_MySQLI_Transaction::$transactions[$this->_connection_id]);
            $subid = key(Database_Driver_MySQLI_Transaction::$transactions[$this->_connection_id]);
            if (!$this->_release_save_point($subid))
            {
                throw new Exception('commit error');
            }
        }
        $status = $this->_query('COMMIT;');
        $this->_query('SET AUTOCOMMIT=1;');
        if ($status) unset(Database_Driver_MySQLI_Transaction::$transactions[$this->_connection_id]);
    }
    else
    {
        # 子事务
        $status = $this->_release_save_point($this->id);
    }
    if ($status)
    {
        $this->id = null;
        return true;
    }
    else
    {
        throw new Exception('not commit transaction');
    }
}