hostname,$this->username,$this->mima,$this->dbname);            $fanhui=$obj->query($str);            if($t==0)            {                return $fanhui;            }            else            {                        while($m=$fanhui->fetch_row())                {                    $attr[]=$m;                                    }                return json_encode($attr);                                }                }                }?>DBDB.class.php