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SQL trigger change data in inserted table??

Posted on 2006-07-21
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How can I change data in inserted table before MS SQL insert data from inserted table to real table?
Thanks for any helping
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Question by:hungxadieu
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Brendt Hess earned 450 total points
ID: 17155381
What version of SQL Server?  

Assuming SQL2K or up, use an INSTEAD OF INSERT Trigger (look in BoL for information on this type of trigger).  Substitute the data you need for the data you get.
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by:Brian Crowe
Brian Crowe earned 300 total points
ID: 17155388
you would need to create an INSTEAD OF INSERT trigger.
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by:hungxadieu
ID: 17155431
Can you give me a simple example?
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by:Sirees
Sirees earned 150 total points
ID: 17155463
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Expert Comment

by:brigzy
ID: 23027527
You could use an AFTER UPDATE trigger.

I think it is an alternative solution to consider because an INSTEAD OF trigger has wide ranging maintenance issues: ie when a new field is added the INSTEAD OF trigger must allways be modified.
Here is my example:
I want to blank out a Solictor and PartyType fields when a Guardian field has been assigned .  (see code snippet)
Note : I have recursive triggers Disabled
Cheers
Brigzy

ALTER TRIGGER [dbo].[trg_usrChildren_Update]
   ON  [dbo].[Usr_Children] 
   AFTER UPDATE
AS 
BEGIN
	-- If Guardian set - blank out Solictor and PartyType
	UPDATE usr_Children
	SET Solicitor = NULL, PartyType = NULL
	FROM usr_Children uc INNER JOIN Inserted i ON uc.ID = i.ID
	WHERE RTRIM(ISNULL(i.GuardianAdLitem,'')) <> ''
END

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Expert Comment

by:brigzy
ID: 23027567

Additional note :
Just to explain that the same above method can be applied to an AFTER INSERT, as more relevent to your initial question.
Cheers
Brigzy

ALTER TRIGGER [dbo].[trg_usrChildren_AfterInsert]
   ON  [dbo].[Usr_Children] 
   AFTER INSERT
AS 
BEGIN
	-- If Guardian set - blank out Solictor and PartyType
	UPDATE usr_Children
	SET Solicitor = NULL, PartyType = NULL
	FROM usr_Children uc INNER JOIN Inserted i ON uc.ID = i.ID
	WHERE RTRIM(ISNULL(i.GuardianAdLitem,'')) <> ''
END

Open in new window

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