mysql tigger怎么了

Question

This is the trigger im trying to add. I keep getting "Updating of NEW row is not allowed in after trigger"

DELIMITER $$

DROP TRIGGER IF EXISTS leaderboard.badges_AUPD$$
USE leaderboard$$
CREATE TRIGGER `badges_AUPD` AFTER UPDATE ON `badges` FOR EACH ROW

set new.badgelevel := case when badgepercent < 50 then 0
                    when badgepercent < 75 then 1
                    else 2 end;
    $$
DELIMITER ;

Answer 1

Your trigger should be before update since after update you cant set any column of the same table, and also missing the begin part

DELIMITER $$
DROP TRIGGER IF EXISTS leaderboard.badges_AUPD$$
USE leaderboard$$
CREATE TRIGGER `badges_AUPD` BEFORE UPDATE ON `badges` 
FOR EACH ROW
BEGIN
 if new.badgepercent < 50 then
   set new.badgelevel = 0 ;
 elseif new.badgepercent < 75 then
   set new.badgelevel = 1 ;
 else 
   set new.badgelevel = 2;
 end if;

end;$$

delimiter ;