一个 MySQL 触发器中的多个事件

Question

我想使用 MYSQL 触发器监视一张表上的多个事件。当这些事件发生时，我可以在这个数据库上做一些事情。下面的代码可以完成这个任务：

DROP TRIGGER if exists trigger_sample1;;  
CREATE TRIGGER trigger_sample1  
after UPDATE on table_1 for each row  
begin  
    /* do something */  
end ;; 

DROP TRIGGER if exists trigger_sample2;;  
CREATE TRIGGER trigger_sample2  
after INSERT on table_1 for each row  
begin  
    /* do something */  
end ;; 

DROP TRIGGER if exists trigger_sample3;;  
CREATE TRIGGER trigger_sample3  
after DELETE on table_1 for each row  
begin  
    /* do something */  
end ;; 

但我希望将这些触发器合并为一个触发器。我尝试了一些代码，例如：

DROP TRIGGER if exists trigger_sample;;  
CREATE TRIGGER trigger_sample  
after UPDATE, INSERT, DELETE on table_1 for each row  
begin  
    /* do something */  
end ;;  

这是行不通的。我也尝试过：

DROP TRIGGER if exists trigger_sample;;  
CREATE TRIGGER trigger_sample  
after UPDATE on table_1  
after INSERT on table_1  
after DELETE on talble_1  
for each row  
begin  
    /* do something */  
end ;;  

这都不起作用。有什么建议吗？