UPDATE SQL query won't update database in my php script - php

Question

I am trying to have an Edit page that fetch the data selected by user and display them in a form. I manage to display the data from database and allow user to edit the data in the form. But my UPDATE query won't work in php. I tried echo the query and run it manual in xampp, it turns out to be ok and it was able to update manual in xampp but not in php. Can anyone help me with the codes? many thanks
this is my php coding
<?php
session_start();
include_once 'dbconnect.php';
if(isset($_POST['btn-update']))
{
$ProdCode = mysql_real_escape_string($_POST['productCode']);
$ProdType = mysql_real_escape_string($_POST['productType']);
$ProdDes = mysql_real_escape_string($_POST['product_description']);
$ProdCol = mysql_real_escape_string($_POST['productColour']);
$ProdPrice = floatval($_POST['productPrice']);
$XSsize = mysql_real_escape_string($_POST['XSquantity']);
$Ssize = mysql_real_escape_string($_POST['Squantity']);
$Msize = mysql_real_escape_string($_POST['Mquantity']);
$Lsize = mysql_real_escape_string($_POST['Lquantity']);
$XLsize = mysql_real_escape_string($_POST['XLquantity']);
$XXLsize = mysql_real_escape_string($_POST['XXLquantity']);
if(isset($_FILES['productImg'])){
$file_name = $_FILES['productImg']['name'];
$file_size = $_FILES['productImg']['size'];
$file_tmp = $_FILES['productImg']['tmp_name'];
$file_type = $_FILES['productImg']['type'];
$file_ext=strtolower(end(explode('.',$_FILES['productImg']['name'])));
$expensions= array("jpeg","jpg","png");
if(in_array($file_ext,$expensions)=== false){
$errors="Please choose JPEG/PNG file.";
$errorTrigger =true;
}
if($file_size > 2097152) {
$errors='File size must be excately 2 MB';
$errorTrigger =true;
}
if(empty($errors)==true) {
move_uploaded_file($file_tmp,"images/".$file_name);
} }
$query = "UPDATE product SET product_code='$ProdCode', product_type='$ProdType' ,description='$ProdDes' ,colour='$ProdCol',price= '$ProdPrice',size_xs='$XSsize',size_s='$Ssize',size_m='$Msize',size_l='$Lsize',size_xl='$XLsize',size_xxl='$XXLsize' WHERE product_code='%". $ProdCode ."%'";
echo $query;
if(mysql_query($query))
{
echo "<script>
alert('Product Updated');
</script>";
}
else
{
echo mysql_error();
?>
<script>alert('Error while updating');</script>
<?php
}
}
?>