sql-server - 如何在插入前将触发器写入散列值？

Question

我有一个名为 employees 的表有 3 列:FirstName , LastName , 和 SSN .

数据每晚由 .Net 服务输入此表，我不太愿意更新。

我想要一个触发器:

Hey, I see you're trying to insert something in the SSN column... let's HASH that before it goes in.

Answer 1

一种方法是使用 INSTEAD OF TRIGGER:

CREATE TRIGGER dbo.HashSSN
ON dbo.tablename
INSTEAD OF INSERT
AS
BEGIN
  SET NOCOUNT ON;

  INSERT dbo.tablename(FirstName, LastName, SSN)
    SELECT FirstName, LastName, HASHBYTES('SHA1', SSN)
    FROM inserted;
END
GO