使用JQuery AJAX和php将数据提取到mysql数据库

Question

Im trying to insert data into my database with AJAX but dont working. I can verify that im connected to the database but when i click it doesnt insert the data. thanks

with a click function i take the 2 parameter that i wanna insert in my database.

$( "#q_answer1" ).click(function () {
      var q_no = $("#q_no").val(); 
      var main_no = $("#total_no").val();

      $.ajax({
         url: "server.php",
         type: "post",
         async: false,
         data: {
            "done": 1,
            "username": q_no,
            "comment": main_no

         }, 
         success: function(){
            $("#q_no").val('');
            $("#total_no").val('');
         }
      });
  });

And here is the php file, first connect to the ddbb and insert the 2 values with the mysql_query.

<?php
include("dbh.php");
if (isset($_POST['done'])) {
   $q_no = mysql_escape_string($_POST['username']);
   $total_no = mysql_escape_string($_POST['comment']);

   mysql_query("INSERT INTO variables(id, names) VALUES('{$q_no}', '{$total_no}')");
   exit();
}
?>

html is like this:

<div id="total_no">1</div>
<div id="q_answer1" class="btn left_b">yes</div>