SQL trigger after update update next row - mysql

Question

I have a table that looks something like this:
Columns:
user_id int(11) PK
module_id int(11) PK
academy_team_id int(11) PK
academy_id int(11) PK
sort_number int(11)
is_complete int(11)
score_to_pass int(11)
is_open int(11)
Now i wish to add a trigger so that when you update this table if the value is_complete is equal to 1 then update the next row's is_open and set it to1
I have attempted with the following trigger sql:
begin
if new.is_complete = 1 then
set next.is_open = 1;
end if ;
end
Sadly this did not work so im not sure how to do it can anyone push me in the right direction?
According to pala_ Answer
im getting the following error when updating my row:
ERROR 1442: 1442: Can't update table 'user_has_academy_module' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
SQL Statement:
UPDATE `system`.`user_has_academy_module` SET `is_complete`='1' WHERE `user_id`='1' and`module_id`='11' and`academy_team_id`='49' and`academy_id`='29'

Answer 1

Your basic trigger body should be something like this:
begin
if new.is_complete = 1 and (select id from <table> where user_id = new.user_id and module_id = new.module_id and academy_team_id = new.academy_team_id sort_number = new.sort_number +1 ) then
update <table> set is_open = 1
where user_id = new.user_id
and academy_team_id = new.academy_team_id
and module_id = new.module_id
and sort_number = new.sort_number + 1;
end if
end
It will check to see if there IS another thing to set open (based on same user_id, academy_team_id and module_id, and next sequential sort_number), and if there is, set it open.
MySQL cant update the same table the trigger is set on. It will need to be done with a stored procedure instead.
delimiter //
create procedure completeandopen(IN param INT)
begin
declare next_id integer;
declare _user_id integer;
declare _module_id integer;
declare _academy_team_id integer;
declare _sort_number integer;
select user_id,
module_id,
academy_team_id,
sort_number
into _user_id,
_module_id,
_academy_team_id,
_sort_number
from tester
where id = param;
update tester set is_complete = 1 where id = param;
select id
into next_id
from tester
where id = param + 1
and user_id = _user_id
and module_id = _module_id
and academy_team_id = _academy_team_id
and sort_number = _sort_number + 1;
if (next_id is not null) then
update tester set is_open = 1 where id = next_id;
end if;
end//
delimiter ;
I think this should work - i haven't tested on your table structure, and it does assume a unique primary key on your table. If it doesn't have that - it's easy enough to modify.
To use it, just call completeandopen(id of the row to be completed) (after changing the table name from tester to your table name)