SQL Server中的表历史记录触发器? [英] Table history trigger in SQL Server?
问题描述
我想创建一个触发器,该触发器将使用插入的值以及更新前后的值写入历史记录表。我还要尽可能多地提供有关该帐户的信息。我将如何在触发器中包含帐户信息?
I'd like to create a trigger that writes to a history table with inserted values and before and after update values. I would also like to include as much information about the account doing the update as is possible. How would i include the account information in my trigger?
这是我到目前为止的内容:
Here is what I have so far:
CREATE TRIGGER [update_history] ON MyTable
FOR UPDATE
AS
INSERT MyTable_History (id, BudgetNumber, PositionNumber, ModifiedDate, action, userId)
SELECT id, BudgetNumber, PositionNumber, GETDATE(), 'BEFORE UPDATE', '???'
FROM deleted
INSERT MyTable_History (id, BudgetNumber, PositionNumber, ModifiedDate, action, userId)
SELECT id, BudgetNumber, PositionNumber, GETDATE(), 'AFTER UPDATE', '???'
FROM inserted
我可以代替'???'吗?
What do i put in place of the '???'?
推荐答案
如果每个如果用户有一个帐户,则可以使用 SYSTEM_USER
函数确定当前用户。但是,如果您的所有连接都通过代理帐户(大多数网站设置中通常是这样)进行,则您必须依靠将正确的userId传递给Update语句:
If each user has an account, you can use the SYSTEM_USER
function to determine the current user. However, if all your connections go through a proxy account, as is typical in most web site setups, then you have to rely on the proper userId being passed to the Update statement:
CREATE TRIGGER [update_history] ON MyTable
FOR UPDATE
AS
INSERT MyTable_History (id, BudgetNumber, PositionNumber, ModifiedDate, action, userId)
SELECT id, BudgetNumber, PositionNumber, GETDATE(), 'BEFORE UPDATE', inserted.userId
FROM MyTable
Join inserted
On inserted.id = MyTable.id
INSERT MyTable_History (id, BudgetNumber, PositionNumber, ModifiedDate, action, userId)
SELECT id, BudgetNumber, PositionNumber, GETDATE(), 'AFTER UPDATE', userId
FROM inserted
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