Having a problem running a query

[!Alive]

So what I'm trying to accomplish is every time the page changes/reloaded check to see if the user has won a random, mystery prize. Right now I have got the random prize page working and I already have the piece of code that randomly decides if the user wins something.
My problem is that it doesn't run my query to update the info in the table. I think my problem may be where I have put the code, which I currently have located in the functions.php.

Any help would be greatly appreciated.
Thank you much in advance.