create update trigger

Question

create update trigger

icampbell

Right there with Babe

Points: 770
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December 13, 2007 at 7:18 am

#377458

I have a view called view_badge and a table called t_badge.
Both the table and the view have the same structure
create table t_badge
YEAR (varchar(12),not null),
STU_CODE (varchar(12) primary key,not null),
JOIN_CODE (varchar(12),not null),
FORENAME1 (varchar(30),null),
FORENAME2 (varchar(30),null),
SURNAME (varchar(40),null),
DOB (datetime,null)
COURSE (varchar(18),not null),
END_DATE (datetime,null))
how would a create an update trigger on view_badge to update t_badge on updates to view_badge.

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Steve Jones - SSC Editor SSC Guru Points: 734449 More actions · Answer 1

I'm not sure what you mean? If you update the view, it updates the table. The view is just a window into the table, there is nothing in the view to update.

If you need a trigger, then create it on the table and when someone updates the view, which updates the table, the trigger will fire.

icampbell Right there with Babe Points: 770 More actions · Answer 2

The view is not created from the table,

The table is created from the view.

So i created the table then inserted the data from the view.

I have a script which fires every minutes if there any any new rows.

Gail Shaw SSC Guru Points: 1004504 More actions · Answer 3

icampbell (12/13/2007)
The view is not created from the table,
The table is created from the view.

So what's view based on? Another table? Several tables?

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

icampbell Right there with Babe Points: 770 More actions · Answer 4

icampbell

Right there with Babe

Points: 770

December 19, 2007 at 8:04 am

#761412

The view is based on several tables

Keith DuAime Ten Centuries Points: 1129 More actions · Answer 5

Keep in mind that this only works when the view is updated and not the underlying table changes that make up the view. If you need to track the changes made to the underlying tables that make up the view you will have to create multiple triggers, one on each table, and/or just create a procedure to handle everything.

IF OBJECT_ID('tr_view_badge') IS NOT NULL

DROP TRIGGER tr_view_badge

go

create trigger tr_view_badge

on view_badge

instead of insert, update, delete

as

BEGIN

DECLARE @action CHAR(1)

IF(EXISTS(SELECT * FROM inserted) AND EXISTS(SELECT * FROM deleted))

SET @action = 'U'

ELSE IF(EXISTS(SELECT * FROM inserted))

SET @action = 'I'

ELSE IF(EXISTS(SELECT * FROM deleted))

SET @action = 'D'

IF @action IS NULL

return

--Do what you need to the table based on the action

END

GO