我有一个名为dsReplicated.matDB
的表和一个列fee_earner
。当该列更新时,我想记录两条信息:
fee_earner
已更新的行中。
当列更新时,我已经掌握了执行某些操作的基本语法,但是需要上面的帮助才能使它生效。
ALTER TRIGGER [dsReplicated].[tr_mfeModified]
ON [dsReplicated].[matdb]
AFTER UPDATE
AS
BEGIN
IF (UPDATE(fee_earner))
BEGIN
print 'Matter fee earner changed to '
END
END
答案 0 :(得分:2)
SQL服务器中的触发器的问题在于,每个SQL语句将它们称为一个-每行不会一次。因此,如果您的 <html>
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语句更新10行,则您的触发器称为一次,并且触发器中的UPDATE
和Inserted
伪表每个包含10行数据
为了查看Deleted
是否已更改,我建议使用这种方法代替fee_earner
函数:
UPDATE()
ALTER TRIGGER [dsReplicated].[tr_mfeModified]
ON [dsReplicated].[matdb]
AFTER UPDATE
AS
BEGIN
-- I'm just *speculating* here what you want to do with that information - adapt as needed!
INSERT INTO dbo.AuditTable (Id, TriggerTimeStamp, Mt_Code, Old_Fee_Earner, New_Fee_Earner)
SELECT
i.PrimaryKey, SYSDATETIME(), i.Mt_Code, d.fee_earner, i.fee_earner
FROM Inserted i
-- use the two pseudo tables to detect if the column "fee_earner" has
-- changed with the UPDATE operation
INNER JOIN Deleted d ON i.PrimaryKey = d.PrimaryKey
AND d.fee_earner <> i.fee_earner
END
伪表包含Deleted
之前 的值-因此,我将UPDATE
用作d.fee_earner
的值审核表中的“列”。
Old_Fee_Earner
伪表包含Inserted
之后的 值,因此这就是为什么我从该UPDATE
伪表中取出其他值插入审核表。
请注意,您实际上必须在该表中具有不可更改主键,此触发器才能起作用。无论如何,对于SQL Server中的任何数据表,这都是推荐的最佳实践。