PHP Mysql update statement with embedded _POST

$result = mysql_query("UPDATE orders SET order_id='".$data['order_id']."',project_ref='".$data['project_ref']."',supp_short_code='".$data['supp_short_code']."',om_part_no='".$data['om_part_no']."',description='".$data['description']."',quantity='".$data['quantity_input']."',cost_of_items='".$data['cost_of_items']."',cost_total='".$data['cost_total_td']."' WHERE order_id = '".$data['order_id']."'") or die(mysql_error());

Oddly its set all fiel开发者_StackOverflowds to "2" (the order_id value) i'm trying to create an "edit orders" page but its not going to plan!?

EDIT:

How i send the data to the PHP:

$('#submit').live('click',function(){ 

                        var postData = {};
                        postData['data[order_id]'] = $('#order_id').text();
                        $('#items tr').not(':first').each(function(index, value) {
                            var keyPrefix = 'data[' + index + ']';
                            postData[keyPrefix + '[supp_short_code]'] = $(this).closest('tr').find('.supp_short_code').text();
                            postData[keyPrefix + '[project_ref]'] = $(this).closest('tr').find('.project_ref').text();
                            postData[keyPrefix + '[om_part_no]'] = $(this).closest('tr').find('.om_part_no').text();
                            postData[keyPrefix + '[description]'] = $(this).closest('tr').find('.description').text();
                            postData[keyPrefix + '[quantity_input]'] = $(this).closest('tr').find('.quantity_input').val();
                            postData[keyPrefix + '[cost_of_items]'] = $(this).closest('tr').find('.cost_of_items').text();
                            postData[keyPrefix + '[cost_total_td]'] = $(this).closest('tr').find('.cost_total_td').text();
                        });

                    $.ajax
                        ({
                        type: "POST",
                        url: "updateorder.php",
                        dataType: "json",
                        data: postData,
                        cache: false,
                        success: function()
                            {
                                alert("Order Updated");
                            }
                        });
                });

Complete PHP Code:

if (isset($_POST['data']) && is_array($_POST['data'])) {
                    foreach ($_POST['data'] as $row => $data) {
                        $result = mysql_query("UPDATE orders SET project_ref='".$data['project_ref']."',supp_short_code='".$data['supp_short_code']."',om_part_no='".$data['om_part_no']."',description='".$data['description']."',quantity='".$data['quantity_input']."',cost_of_items='".$data['cost_of_items']."',cost_total='".$data['cost_total_td']."' WHERE order_id = '".$data['order_id']."'") or die(mysql_error());
                    }
                }
                var_dump($data);

1. This is unsafe. You should escape any values sent to MySQL, using mysql_real_escape_string
2. What does the data look like? Are you sure $data contains the right values?
3. What does the generated query look like, before it's sent to MySQL?
4. There's no need to update the order_id (thanks, Fosco)