MySQL触发器触发更改或删除

我遇到了一个有趣的问题.我想创建两个触发器，触发器1将在DROP TABLE上触发，触发器2将在ALTER TABLE上触发.如果要删除或更改任何表，我希望触发器1和触发器2触发，但是，不幸的是，我不知道执行该操作的语法，而且我也找不到此类触发器的语法.在MySQL中，我只能编写在INSERT，UPDATE或DELETE之前/之后触发的触发器，但是现在我想编写适用于数据库级别并在表事件上触发的触发器.有人可以帮我吗?

I've encountered an interesting problem. I would like to create two triggers, trigger1 would fire on DROP TABLE and trigger2 on ALTER TABLE. I would like trigger1 and trigger2 to fire if any table is dropped or altered, but, unfortunately I don't know the syntax to do that and I couldn't find a syntax for such triggers either. In MySQL I can only write triggers which fire before/after INSERT, UPDATE, or DELETE, but now I would like to write triggers which would be applicable on database level and would fire on table events. Can somebody help me?