MySQL - 問題集 - 觸發器更新本表數據異常"Can’t update table ‘tbl’ in stored function/trigger because it is already used by statement which invoked this"

如果你在觸發器里面對剛剛插入的數據進行了 insert/update, 則出現這個問題。因為會造成循環的調用.

create trigger test
before update on test
for each row
  update test set NEW.updateTime = NOW() where id=NEW.ID;
END

應該使用set操作，而不是在觸發器里使用 update,比如

create trigger test
before update on test
for each row
set NEW.updateTime = NOW();
END