public function error()
{
if (!empty($this->_mysqli->connect_errno)) {
return array('code' => $this->_mysqli->connect_errno, 'message' => is_php('5.2.9') ? $this->_mysqli->connect_error : mysqli_connect_error());
}
return array('code' => $this->conn_id->errno, 'message' => $this->conn_id->error);
}