如何用QT实现一个计时器的程序

database infomastion
$db_info=array(
'h'=>'localhost'，
'u'=>'root'，
'pwd'=>'program'，
'dbname'=>'agency'
);
$mysqli = new mysql($db_info);
$query = $mysqli->query("select * from user_list");
while($row=$mysqli->fetch_row($query)){
echo $row[1];
}