How to use while loop in mysql (MariaDB) - mysql

Question

I am trying to use while loop in my stored procedure, but it doesn't want to accept the syntax.
I am using HeidiSQL as a Studio, database is MySQL MariaDB.
BEGIN
CREATE TEMPORARY TABLE taskTemp
SELECT jc.Id as JID
FROM jobs as j
left join jobcards as jc on j.JobcardId = jc.Id
left join tasks as t on j.Id = t.JobId
left join assignments as a ON t.Id = a.TaskId
WHERE a.PerformerId = currentUserId
group by jc.Id;
SELECT GROUP_CONCAT(JID SEPARATOR ',') AS result
INTO #test
FROM taskTemp;
CREATE TEMPORARY TABLE UserTasks
Select j.Id ,j.JobcardId as JcID, t.Id as TaskID ,js.Name as TaskStatus
from jobs as j
left join tasks as t on j.Id = t.JobId
Join assignments as a on t.Id = a.TaskId and a.PerformerId = currentUserId
left Join jobstatuses as js on t.StatusId = js.Id
WHERE FIND_IN_SET(j.JobcardId, #test);
alter table UserTasks add UserStatus longtext;
SET #n=0;
SET #i=0;
SELECT COUNT(*) FROM UserTasks INTO #n;
WHILE (#n>0) DO
SET #n=#n-1;
END WHILE;
drop temporary table taskTemp;
drop temporary table UserTasks;
END
Above you can see my whole stored procedure, so the problem is coming at this row:
WHILE (#n>0) DO
SET #n=#n-1;
END WHILE;*
*
I have tried without brackets also #n>0, but also without success

Answer 1

I think this is an issue with SQL mode configuration in your mariadb environment. You can try one of the following options :
1. Use oracle loop syntax :
SET #n=5;
WHILE #n>0 LOOP
SET #n=#n-1;
SELECT #n;
END LOOP;
2. Change sql mode to tradionnal :
SET sql_mode = 'TRADITIONAL';
SET GLOBAL sql_mode = 'TRADITIONAL';