我可以在 mysql 的一个触发器声明中定义多个事件吗? [英] Can I define multiple events in one Trigger declaration in mysql?

问题描述

这是我的要求，我有一个 mysql 表，任何更改(插入/删除/更新)都应该以完全相同的方式处理.根据mysql文档创建触发器语法如下:

Here is my requirement, I have a mysql table on which any change (insert/delete/update) should be handled in exactly same way. According to mysql documentation create trigger syntax is as follows:

    CREATE
     [DEFINER = { user | CURRENT_USER }]
     TRIGGER trigger_name
     trigger_time **trigger_event**
     ON tbl_name FOR EACH ROW
     trigger_body

当我尝试放置多个事件时，会抛出语法错误.一种解决方案是我可以编写一个过程和 3 个触发器(每个事件一个)并从所有触发器调用相同的过程.

When I'm trying to put more than one event, its throwing syntax error. One solution is I can write one procedure and 3 triggers (one for each event) and call the same procedure from all the triggers.

对此有什么复杂的解决方案吗??

Is there any sophisticated solution for this ??

推荐答案

没有.在 MySQL 中，触发器用于单个 trigger_event.触发器必须是 BEFORE 或 AFTER 和 INSERT、UPDATE、DELETE.

No. In MySQL, a trigger is for a single trigger_event. A trigger has to be either BEFORE or AFTER and one of INSERT, UPDATE, DELETE.

如果我们有很多跨触发器事件共享的逻辑(需要在多个触发器中复制的逻辑)，我们可以编写/创建一个 PROCEDURE 来封装该逻辑，并从多个触发器的主体中调用该过程触发器.

If we have lots of logic that is shared across the trigger events (logic that would need to be duplicated in multiple triggers), we can write/create a PROCEDURE to encapsulate that logic, and call that procedure from the body of multiple triggers.

这篇关于我可以在 mysql 的一个触发器声明中定义多个事件吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！