mysql trigger stored trigger is already used by statement which invoked stored trigger

Question

I want to set up a trigger so that if on an update the prediction field is = 3 then the trigger changes the value to 4 and saves it in the database. The trigger is below.

Answer 1

MySQL triggers can't manipulate the table they are assigned to. All other major DBMS support this feature so hopefully MySQL will add this support soon.

http://forums.mysql.com/read.php?99,122354,240978#msg-240978

Answer 2

Also, you need to ensure that you don't have other procedures or functions that perform updates on the table that this particular procedure is assigned to or you end up in a recursion. For instance

create trigger trig1 After update on table1 FOR EACH ROW 
BEGIN 
UPDATE table2 SET colum1 = column1 + 1
END;

create trigger trig2 After update on table2 FOR EACH ROW 
BEGIN 
UPDATE table1 SET colum2 = column2 + 1
END;

This will end up in a recursion so beware of the existing stored procedures and functions.