Question

I have a list of users in a specific order. Each week I’d like to bump the order of the queue by one, for example

Week 1
User | Order
a    | 1
b    | 2
c    | 3

Week 2
User | Order
b    | 1
c    | 2
a    | 3

and so on…

Is there a simple way to achieve this with just PHP and MySQL?

Answer 1

Set a weekly cron job:

1. First you have to subtract 1 Order to all rows: UPDATE TABLE SET Order = Order-1
2. Then you have to change “0” value Order: UPDATE TABLE SET Order = MAX(Order)+1 WHERE Order = 0

If you have a restriction to “0” value in Order colummn:

1. First you have to change “1” value Order: UPDATE TABLE SET Order = MAX(Order)+1 WHERE Order = 1
2. Then you have to subtract 1 Order to all rows: UPDATE TABLE SET Order = Order-1