Question

I want to call procedure at certain time, so I instatinate an event that will do it (call procedure) for me. Code looks like this:

CALL MainProcedure(@firstOutParam, @secondOutParam);

SELECT @moveId, @endTime; #select just for check if parameters are ok

CREATE EVENT myevent1 ON SCHEDULE AT @endTime DO CALL 
`database`.`SupportingProcedure`(@firstOutParam);

CREATE EVENT myevent2 ON SCHEDULE AT @endTime DO CALL `database`.`OnlyForTestProcedure`();

Both SupportingProcedure and OnlyForTestProcedure when called not from event work properly, also, myevent2 calls .OnlyForTestProcedure.

The only thing that doesn’t work is myevent1. It appears on show events, it then disappears but it doesn’t work (SupportingProcedure either isn’t called or doesn’t work..).

Do you see anything I do wrong? What should I do to make it work?
Any help appreciated, I have no clue what else to check.

Answer 1

As I mentioned earlier CREATE EVENT within procedure is not possible, it probably shuts the topic, but read on.

1) If you use MySQL with PHP and need single event in database, you can instantinate one via mysqli query method.

2) If you need to keep track of certain changes in tables you may can create an event that is some sort of daemon. Just set it to:

CREATE EVENT EventDaemon
ON SCHEDULE EVERY 1 SECOND STARTS NOW() DO
CALL procedure();

where procedure executes its body only if specific requirements occurs (that would make you CREATE EVENT in original situation). Can’t really tell if it’s efficient, but it works fine for me.

I hope I’ve made myself clear.