if (_rs != null) return "MysqliResult[" + _rs + "]"; else return "MysqliResult[closed]";
return "MysqliResult[" + super.toString() + "]";
  public String toString()  {    if (_rs != null)      return "MysqliResult[" + _rs + "]";    else      return "MysqliResult[closed]";  }