How to write multiple queries in stored procedure - php

Question

What I'm trying to do is when user roles changed to 1 or from 1 then delete all his entries from ForumManager table which IsDirect value is 0 or if its value changes to 1 then I need to insert person's entry to ForumManager table for all ForumID.
But for inserting it I have to run 1 more queries to get ForumID and insert in ForumManager with loop.
What I try till now is incomplete and maybe not correct or right way I don't know how to run loop inside stored procedure.
delimiter //
CREATE PROCEDURE update_forum_admin (IN user_id INT, IN previous_role INT,IN new_role INT)
BEGIN
if(previous_role == 1)
{
DELETE ForumManager WHERE UserID=user_id AND IsDirect=0
}
elseif(new_role == 1)
{
SELECT ForumID FROM Forum
INSERT ForumManager (ForumID,UserID,IsDirect) VALUES (forum_id,user_id,0)
}
END//
delimiter ;

Answer 1

If you have a column name user_id in Forum table than rename the parameter from user_id to userId.
delimiter //
CREATE PROCEDURE update_forum_admin (IN userId INT, IN previous_role INT,IN new_role INT)
BEGIN
if(previous_role == 1)
{
DELETE ForumManager WHERE UserID=userId AND IsDirect=0
}
elseif(new_role == 1)
{
INSERT ForumManager (ForumID, UserID, IsDirect)
SELECT ForumID, userId, 0 FROM Forum group by ForumID, userId, 0
}
END//
delimiter ;

Answer 2

You can declare a coursor with ID_forum and iterate it inside an elseif statement like below(is a pseudo code, if you have e problem to implement it let me know):
CREATE PROCEDURE update_forum_admin (IN user_id INT, IN previous_role INT,IN new_role INT)
BEGIN
CURSOR CUR_ID_FORUM
IS
SELECT ForumID FROM Forum;
if(previous_role == 1)
{
DELETE ForumManager WHERE UserID=user_id AND IsDirect=0
}
elseif(new_role == 1)
{
FOR REC_ID_FORUM IN CUR_ID_FORUM
LOOP
INSERT ForumManager (ForumID,UserID,IsDirect) VALUES (REC_ID_FORUM,user_id,0)
END LOOP;
}
END update_forum_admin ;

Answer 3

its quiet late but Mohit you can get rid of syntax error by modifying code like
CREATE PROCEDURE update_forum_admin (IN user_id INT, IN previous_role INT,IN new_role INT)
BEGIN
if(previous_role = 1)
BEGIN
DELETE ForumManager WHERE UserID=user_id AND IsDirect=0
END
if(new_role = 1)
BEGIN
SELECT ForumID FROM Forum
INSERT ForumManager (ForumID,UserID,IsDirect) VALUES (forum_id,user_id,0)
END
Also I Can see when you delete a user from ForumManager you do not delete for particular Forum. May be you have only one Forum and if that is the case then take top 1 Forum Id from Forum table