SQL Server 2008-在插入/更新时触发将值复制到另一个表的触发器吗？

Question

I have these two tables: Tasks and TasksHistory, from the name you can guess that I want to create a history of everything that's been going on in Tasks. So, every new row inserted or updated needs to go into the history table, just ignoring when it's deleted, keeping the row safe in history. My idea is that history be an exact replica of the original table.

How can I achieve this?

Answer 1

Quite simple...

CREATE TRIGGER TRG_Tasks_UI ON Tasks FOR INSERT,UPDATE
AS
SET XACT_ABORT, NOCOUNT ON

--Ignore zero row updates, inserts
IF NOT EXISTS (SELECT * FROM INSERTED) RETURN;

BEGIN TRY
    INSERT TasksHistory
       (col1, col2, ...)
    SELECT
       I.*
    FROM
       INSERTED I
       LEFT JOIN
       DELETED D ON I.key = D.Key
    WHERE
       D.Key IS NULL --insert only
       OR -- need null handling here
       I.col1 <> D.col1 OR I.col2 <> D.col2 OR ...;
END TRY
BEGIN CATCH
   IF XACT_STATE() <> 0 ROLLBACK TRANSACTION
    RAISERROR [rethrow caught error using @ErrorNumber, @ErrorMessage, etc]
END CATCH
GO