Question

Hey i have a trigger that fires after update that’s defined as following:

CREATE DEFINER =  `root`@`localhost` TRIGGER `logs_m` AFTER UPDATE ON  
`logs_month` FOR EACH ROW
 BEGIN IF NEW.status =1 THEN INSERT INTO logs_payments( direction, 
TYPE , amount, agent_id, invoice_number ) 
VALUES ( 0, 3, NEW.reward_minutes, NEW.agent_id, NULL ) ,
 ( 0, 5, NEW.credit, NEW.agent_id, NULL ) ;

END IF ;
END

Now on logs_payments i have a trigger on after insert which is defined like this :

CREATE DEFINER =  `root`@`localhost` TRIGGER `payments_invoice` BEFORE INSERT ON 
 `logs_payments` 
FOR EACH
ROW BEGIN 
IF NEW.direction =0
THEN 
SET NEW.invoice_number = ( SELECT MAX( IFNULL( invoice_number, 100000000 ) ) +1
FROM logs_payments l
WHERE l.direction =0 ) ;

END IF ;

IF NEW.direction =1 THEN SET NEW.invoice_number = 
( SELECT MAX( IFNULL( invoice_number, 200000000 ) ) +1
FROM logs_payments l
WHERE l.direction =1 ) ;

END IF ;

END

Now the the first inserted row invoice_number gets null and the 2nd gets the right value.

Any idea why that should happen?

Answer 1

Solved it, the triggers where fine I had a problem in my query, since I didn’t have value on first I set :

SELECT MAX( IFNULL( invoice_number, 100000000 ) ) +1

Which was wrong it should be

select ifnull(max(invoice_number),100000000)+1

And now it works fine.