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MySQL限制插入/更新/删除要从触发器调用（不是从应用程序代码）

[英]Mysql limit insert/update/delete to being called from trigger (Not from application code)

原文 2014-03-04 07:34:11 5 1 mysql/ sql/ triggers/ innodb

My use case is that I have a MYSQL table which has a change tracking table behind it. 我的用例是我有一个MYSQL表，后面有一个更改跟踪表。 Both tables are InnoDB. 这两个表都是InnoDB。
I'd like to use triggers to enforce two things. 我想使用触发器来强制执行两件事。

One : forcing a copy to be made of previous state on every update (update trigger performs insert select query) This is non-trivial and I have already done it. 一个：强制在每次更新时复制以前的状态（更新触发器执行插入选择查询）这很简单，我已经做过了。

Two : limit access to the second table to read only for users, while triggers can still insert/update/delete as necessary 二：将对第二张表的访问限制为仅对用户只读，而触发器仍可以根据需要插入/更新/删除

1 个解决方案

Further research on user access and triggers has dug up this: 对用户访问和触发器的进一步研究已经挖掘出了这一点：

Mysql 5.5 reference manual: 19.6 Access Control for Stored Programs and Views Mysql 5.5参考手册：19.6存储程序和视图的访问控制

Turns out that stored programs can be assigned a user to run as. 事实证明，可以为存储的程序分配一个用户以其身份运行。 Triggers are stored programs. 触发器是存储的程序。 By restricting Insert, Update, and Delete to a special user which only will be used by a trigger and using the DEFINER attribute of the trigger (or any stored program) I can make the trigger which I want to have access run under that user. 通过将“插入，更新和删除”限制为仅由触发器使用的特殊用户，并使用触发器（或任何存储的程序）的DEFINER属性，可以使要访问的触发器在该用户下运行。

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