private function _checkBinds()
    {
        if ($this->_fetch_sty!=\PDO::FETCH_BOUND) {
            return;
        }
        foreach ($this->_binds as $key => &$value) {
            if (is_numeric($key)) {
                $key --;
            } else {
                $key = strtoupper($key);
            }
            if (!array_key_exists($key, $this->_current)) {
                continue;
            }
            $value = $this->_current[$key];
        }
    }