Question

I got the two following triggers, each one worked alone, but together they don’t.

How can I make them to work together? They update different fields in table.

trigger 1:

create trigger wys_sk_u after update on `things`
for each row
begin
UPDATE `current` s 
INNER JOIN things u ON s.id_thing = u.id_thing
INNER JOIN dude_base b ON b.id= s.id
SET s.`curr_cash` = u.cash1 * b.cash2/ 100;
end;
$$

trigger 2:

create trigger suma_u after update on `current`
for each row
begin
UPDATE `current`
SET `mysum` = `curr_cash` + `mysum`;
end;
$$

First one should update when cash1 or cash2 updates, and change value of curr_cash.
Second should update when curr_cash updates, and change mysum.

I got following error when I edit table things:

#1442 - Can't update table 'current' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. 

@edit
added new answear to the question.

---

What if I want to do something like this:

CREATE TRIGGER total BEFORE UPDATE ON `current` FOR EACH ROW
BEGIN
if new.`new_pay_date` <> old.`new_pay_date`
  SET new.`total_cash` = new.`curr_cash` + new.`total_cash`;
end if;
END;
$$

Error:

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET new.`total_cash` = new.`curr_cash` + new.`total_cash`; end if;' at line 4

This was working without

if new.`new_pay_date` <> old.`new_pay_date`
end if;

But I need to check this, and only update with date change.

current table:

curr_cash
new_pay_date
id_person
id_thing
total_cash

Anyone can help me with this one?

Answer 1

The problem is in the second trigger. Try to use BEFORE UPDATE trigger to change field value using SET statement –

CREATE TRIGGER suma_u BEFORE UPDATE ON `current` FOR EACH ROW
BEGIN
  SET new.`mysum` = new.`curr_cash` + new.`mysum`;
END;