Vote up-down using Mysql , Jquery and Php - php

Question

I am trying to make vote up-down system using php ,mysql and jquery. It works perfectly on front-end but, at the back-end it does not add data in the database. Any help/suggestions will be appreciated..!! Following is the code..
<span id="links-<?php echo $rec1['que_id']; ?>">
<input type="hidden" id="votes-<?php echo $rec1['que_id']; ?>" value="<?php echo $rec1['votes']; ?>">
<?php
$vote_rank = 0;
$query ="SELECT SUM(vote_rank) as vote_rank FROM cvotes WHERE que_id = '".$rec1['que_id']."' and username = '$logged_user'";
$result2 = $conn->query($query);
foreach ($result2 as $roww) {
$up = "";
$down = "";
if(!empty($roww["vote_rank"])) {
$vote_rank = $roww["vote_rank"];
if($vote_rank == -1) {
$up = "enabled";
$down = "disabled";
}
if($vote_rank == 1) {
$up = "disabled";
$down = "enabled";
}
}
?>
<input type="hidden" id="vote_rank_status-<?php echo $rec1['que_id']; ?>" value="<?php echo $vote_rank; ?>">
<span class="btn-votes">
<input type="button" title="Up" class="up" onClick="addVote(<?php echo $rec1['que_id']; ?>,'1')" <?php echo $up; ?> />
<span class="label-votes"><?php echo $rec1['votes']; ?></span>
<input type="button" title="Down" class="down" onClick="addVote(<?php echo $rec1['que_id']; ?>,'-1')" <?php echo $down; ?> />
<p id='show'></p>
</span>
function addVote(que_id,vote_rank) {
$.ajax({
data:'que_id='+que_id+'&vote_rank='+vote_rank,
url: "add_vote.php",
type: "POST",
beforeSend: function(){
$('#links-'+que_id+' .btn-votes').html("<img src='LoaderIcon.gif' />");
},
success: function(vote_rank_status){
var votes = parseInt($('#votes-'+que_id).val());
var vote_rank_status;// = parseInt($('#vote_rank_status-'+que_id).val());
switch(vote_rank) {
case "1":
votes = votes+1;
vote_rank_status = vote_rank_status+1;
break;
case "-1":
votes = votes-1;
vote_rank_status = vote_rank_status-1;
break;
}
$('#votes-'+que_id).val(votes);
$('#vote_rank_status-'+que_id).val(vote_rank_status);
var up,down;
if(vote_rank_status == 1) {
up="disabled";
down="enabled";
}
if(vote_rank_status == -1) {
up="enabled";
down="disabled";
}
var vote_button_html = '<input type="button" title="Up" class="up" onClick="addVote('+que_id+',\'1\')" '+up+' /><span class="label-votes">'+votes+'</span><input type="button" title="Down" class="down" onClick="addVote('+que_id+',\'-1\')" '+down+' />';
$('#links-'+que_id+' .btn-votes').html(vote_button_html);
}
});
}
<?php
//-----add_vote.php-----
if(!empty($que_id)) {
if(isset($_SESSION['login_user']))
{
$logged_user = $_SESSION['login_user'];
}
$que_id=$_POST["que_id"];
$vote_rank = $_POST["vote_rank"];
require_once("dbcontroller.php");
$db_handle = new DBController();
$query = "INSERT INTO cvotes (que_id,username,vote_rank) VALUES ('$que_id','$logged_user','$vote_rank')";
$result = $db_handle->insertQuery($query);
if(!empty($result)) {
$query = "SELECT SUM(vote_rank) as vote_rank FROM cvotes WHERE que_id = '$que_id' and username = '$logged_user'";
$row = $db_handle->runQuery($query);
switch($vote_rank) {
case "1":
$update_query ="UPDATE questions SET votes = votes+1 WHERE que_id='" . $que_id . "'";
break;
case "-1":
$update_query ="UPDATE questions SET votes = votes-1 WHERE que_id='" . $que_id . "'";
break;
}
$result = $db_handle->updateQuery($update_query);
print $roww["vote_rank"];
}
}
?>

Answer 1

Seems to that your insert query is wrong "INSERT INTO cvotes (que_id,username,vote_rank) VALUES ('$que_id','$logged_user','$vote_rank')", try to use the quotes according to the data type.. you have gave quotes for all the values, i think except username rest are integer datatypes then change the query as
"INSERT INTO cvotes (que_id,username,vote_rank) VALUES ($que_id,"'"+$logged_user+"'",$vote_rank)";

Answer 2

Okay,so finally issue solved..!! Had just minor errors of variables and linking..below is the code..
Added hidden input :
">
Some changes in add_vote.php :
<?php
include('../connection.php');
session_start();
if(isset($_SESSION['login_user']))
{
$logged_u = $_SESSION['login_user'];
}
if(!empty($_POST["que_id"])) {
require_once("dbcontroller.php");
$db_handle = new DBController();
$query = "INSERT INTO cvotes (username,que_id,vote_rank) VALUES ('".$logged_u."','" . $_POST["que_id"] . "','" . $_POST["vote_rank"] . "')";
$result = $db_handle->insertQuery($query);
if(!empty($result)) {
$query = "SELECT SUM(vote_rank) as vote_rank FROM cvotes WHERE que_id = '" . $_POST["que_id"] . "' and username = '".$logged_u."' ";
$row = $db_handle->runQuery($query);
switch($_POST["vote_rank"]) {
case "1":
$update_query ="UPDATE questions SET votes = votes+1 WHERE que_id='" . $_POST["que_id"] . "'";
break;
case "-1":
$update_query ="UPDATE questions SET votes = votes-1 WHERE que_id='" . $_POST["que_id"] . "'";
break;
}
$result = $db_handle->updateQuery($update_query);
print $roww["vote_rank"];
}
}
?>