Question

How can I update multiple tables with an insert? What I’m trying here doesn’t work. Also, how can I add/subtract u.score with the difference between a vote variable and the existing v.weight?

INSERT INTO votes (userid, publication_id, weight) VALUES (1,2,3)
            ON DUPLICATE KEY 
              UPDATE votes v, users u


            SET v.weight=1
              WHERE v.userid=1
              --TODO: update u.score

Answer 1

It sounds like you probably want to use a trigger:

http://dev.mysql.com/doc/refman/5.0/en/triggers.html

Alternatively, you could encapsulate your initial insert, your logic, and any subsequent inserts into a stored procedure:

http://dev.mysql.com/doc/refman/5.0/en/stored-routines.html