Question

I am developing an Auction site in asp.net3.5 and sql server 2008R2, My Database has an Auction Table that has a calculated column “AuctionStatus” –
(case when [EndDateTime] < getdate() then ‘0’ else ‘1’ end)
that gives auction status Active or inactive based on End Date.

Now I want to call a stored procedure that sends email notifications to buyers and sellers as soon as AuctionStatus becomes ‘0’. For that i tried to create a after update trigger that could call the email notification sp, but i am not able to do so.
I am getting the following error message :-

Msg 2114, Level 16, State 1, Procedure trgAuctionEmailNotification,
Line 6 Column ‘AuctionStatus’ cannot be used in an IF UPDATE clause
because it is a computed column.

The trigger is:

CREATE TRIGGER trgAuctionEmailNotification ON SE_Auctions
AFTER UPDATE
AS
BEGIN
    IF (UPDATE (AuctionStatus))

BEGIN

 IF EXISTS (SELECT * FROM inserted WHERE currentbidderid > 0
                                      AND AuctionStatus='0' )
     BEGIN
        DECLARE @ID int
        SELECT @ID = AuctionID from inserted
        EXEC spSelectSE_AuctionsByAuctionID @ID         
     END
    END
END

Answer 1

You could just replace AuctionStatus with the corresponding expression :

IF EXISTS (SELECT * FROM inserted WHERE currentbidderid > 0 AND [EndDateTime] < getdate() )

But, the point is I don’t see how your trigger will be “triggered” as [AuctionStatus] is never “updated”. Its Value is just calculated whenever you need it.

You could go for a sql job that runs every x minutes and send a notification for each auction which ended during the last x minutes.