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Go Back   Code Forums > Application and Web Development > Everything SQL ( MySQL, MSSQL, DB2, Postgre, Oracle, etc...)
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Old 06-27-2006, 02:55 PM   #1 (permalink)
DJMaze
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MySQL TRIGGER statements

It's nice to see that MySQL 5 now supports triggers.
The only thing i'm missing is exception/error handling

For example you have a members table and when a member gets deleted then you want to clean up other tables as well.
Code:
DROP TRIGGER IF EXISTS del_member; CREATE TRIGGER del_member BEFORE DELETE ON members FOR EACH ROW BEGIN DELETE FROM groups_user WHERE member_id = OLD.member_id; DELETE FROM members_details WHERE member_id = OLD.member_id; DELETE FROM members_stats WHERE member_id = OLD.member_id; END;
But now i want to protect my own account for getting deleted.
Code:
DROP TRIGGER IF EXISTS del_member; CREATE TRIGGER del_member BEFORE DELETE ON members FOR EACH ROW BEGIN IF (OLD.member_id = 1) THEN EXCEPTION "not allowed to delete djmaze"; DELETE FROM groups_user WHERE member_id = OLD.member_id; DELETE FROM members_details WHERE member_id = OLD.member_id; DELETE FROM members_stats WHERE member_id = OLD.member_id; END;
MySQL still doesn't support this.

Someone already found a workaround, or should i just run a query that crashes

Code:
DROP TRIGGER IF EXISTS del_member; CREATE TRIGGER del_member BEFORE DELETE ON members FOR EACH ROW BEGIN IF (OLD.member_id = 1) THEN INSERT INTO members VALUES (NULL); .......... END;
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