MySQL query is running but not running

Alright let me explain myself here:

I am making an online text based game. I have a page where 3 things can happen:

So far I have creating a position working. I moved on deleting a position next. All was good and I got no errors, no warnings, etc.. And when I ran it, it came back to the screen it was supposed to after the script to delete the position ran. It is only supposed to come here after the query runs.

Well nothing happened and after 3 hours of trying crap I'm coming to you guys b/c I'm on my last leg. I still have no critical errors, nothing is making it fail: Here is my code.

<?php
//In the include file is the connection to the db
include("library/new_library.php");

//Below is the session id, gets their position id from the DB, than grabs whether or not they can edit the company
$user_id = $_SESSION['user_id'];
$sql = "SELECT ID, PositionID FROM users WHERE ID = '$user_id'";
$query = mysql_query($sql);
while($row = mysql_fetch_assoc($query))
{
    $position = $row['PositionID'];
}
$sql = "SELECT * FROM tblCPositions WHERE PositionID = '$position'";
$query = mysql_query($sql);
while($row = mysql_fetch_assoc($query))
{
    $editCompany = $row['Edit_Company'];
}


//Next I check for position edit and if they try to put in the position id of a position the company does not control it gives them a "nice" message.
$company = $_SESSION['company'];
if($_GET['pidedit']){
    $position = $_GET['pidedit'];
    $sql = "SELECT * FROM tblCPositions WHERE PositionID = '$position'";
    $query = mysql_query($sql);
    while($row = mysql_fetch_assoc($query))
    {
        if($row['CompanyID'] != $company)
        {
            $warning = "<div class='warning'>You are trying to edit a position that does not belong to your company.  DO NOT TRY TO CHEAT THE SYSTEM!</div>";
        }
        else
        {
            $positionArray[] = array(ID => $row['PositionID'], name => $row['Name'], hire => $row['Hire'], fire => $row['Fire'], bid => $row['Contract'], edit => $row['Edit_Company'], finances => $row['Finances']);
        }
    }
}

//Here I check for $_GET delete
elseif($_GET['piddelete'])
{
    $position = $_GET['piddelete'];
    $sql = "SELECT * FROM tblCPositions WHERE PositionID = '$position'";
    $query = mysql_query($sql);
    while($row = mysql_fetch_assoc($query))
    {
        if($row['CompanyID'] != $company)
        {
            $warning = "<div class='warning'>You are trying to delete a position that does not belong to your company.  DO NOT TRY TO CHEAT THE SYSTEM!</div>";
        }
    }
}
else
{
    $sql = "SELECT * FROM tblCPositions WHERE CompanyID = '$company'";
    $query = mysql_query($sql);
    $number = mysql_num_rows($query);
    $numberLeft = 12 - $number;
    while($row = mysql_fetch_assoc($query))
    {
        $positionArray[] = array(ID => $row['PositionID'], name => $row['Name'], hire => $row['Hire'], fire => $row['Fire'], bid => $row['Contract'], edit => $row['Edit_Company'], finances => $row['Finances']);
    }
}

//
if($_POST['submitNewPosition'])
{
    $name = $_POST['positionName'];
    $hire = $_POST['hire'];
    $fire = $_POST['fire'];
    $bid = $_POST['bid'];
    $edit = $_POST['edit'];
    $finances = $_POST['finances'];
    $cid = $_SESSION['company'];
    $sql = "INSERT INTO tblCPositions(CompanyID, Name, Hire, Fire, Co开发者_如何转开发ntract, Edit_Company, Finances) VALUES ('$cid','$name','$hire','$fire','$bid','$edit','$finances')";
    $query = mysql_query($sql);
    if($query)
    {
        header("location: view_company.php?newp=success");
    }
}

//Haven't finished this section yet
if($_POST['submitEditPosition'])
{
    $name = $_POST['positionName'];
    $fire = $_POST['hire'];
    $fire = $_POST['fire'];
    $bid = $_POST['bid'];
    $edit = $_POST['edit'];
    $finances = $_POST['finances'];
}

//This this is my problem area, this is where it says its running the query but its not.
if(isset($_POST['deletePosition']))
{
    $deleteID = $_GET['piddelete'];
    $deleteSql = "DELETE FROM tblCPositions WHERE PositionID = '$deleteID'";
    $deleteQuery = mysql_query($deleteSql);
    if($deleteQuery)
    {
        header("location: view_company.php?delete=success");
    }
    if(!$deleteQuery)
    {
        header("location: view_company.php?delete=failure");
    }
}

UPDATE -

Ok so I got it working the problem was something I forgot, this form was just meant to be a "yes or no form" so I was doing post only to post the submit button, nothing else was on the form. What I had forgot was on the action="file.php" (what I had) I had forgotten to pass on the get variable so once I changed it to action="file.php?piddelete=12" it worked.

Thanks for everyones help I really appreciate it.

10 to 1 your variable $_GET['piddelete']; is empty. What do you get when you do this:

var_dump($_GET['piddelete']);

Disable the header redirect so that you can see the output.

edit

Or, as Nick pointed out, you can add die() statements to your queries:

$deleteQuery = mysql_query($deleteSql) or die(mysql_error());

If your query still runs, and the script doesn't die, and the position is still not deleted, you should check the query, it may be deleting 0 rows successfully. try killing at die($deleteSql); and run the query through MySQL's console.

/edit

Also, I'm compelled to introduce you to my good friend SQL injection attack. You should filter all data contained in the $_POST and $_GET superglobals before handing them over to the MySQL server. use mysql_real_escape_string().

Try to grok this:

whatever.com/your_url.php?pidedit=x'%3B%20DROP%20TABLE%20tblCPositions%3B%20--

If I were to execute that query string on your application, your tblCPositions table would be dropped.