@@Rowcount is not reliable?

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@@Rowcount is not reliable?

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Raghavendra-499237

Posted Wednesday, June 03, 2009 1:51 AM

SSChasing Mays

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I have used @@RowCount next to one update statement in a stored procedure.
It was working fine in one of our production database, but recently we observed sometimes it will not work properly.

is @@RowCount is not reliable?

please advice.

Post #727944

Sergiy

Posted Wednesday, June 03, 2009 2:16 AM

SSCarpal Tunnel

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It never failed on my memory.
Unexpected results it returned only in cases when it was used incorrectly.

Can you show your code?
But don't modify anything, every detail may be very important.

Post #727954

Raghavendra-499237

Posted Wednesday, June 03, 2009 4:11 AM

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Hi Sergiy,
my stored procedure is as follows..
basically this procedure should return @NewStatus only once if it is called multiple times for a given @ID

UPDATE Table SET Status=@NewStatus WHERE ID=@ID AND Status=@CurrentStatus
IF @@ROWCOUNT=1
RETURN @NewStatus
ELSE
RETURN @CurrentStatus

Post #728030

Sergiy

Posted Wednesday, June 03, 2009 4:24 AM

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Try to run this:

SELECT ID, Status, COUNT(*)
FROM Table
GROUP BY ID, Status
HAVING COUNT(*) > 1

Post #728036

EdVassie

Posted Thursday, June 04, 2009 7:09 AM

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You have to be careful when using @@ROWCOUNT. Your example should work as you expect, but the example below will not...

UPDATE .....
SELECT @MyErr = @@ERROR
IF @@ROWCOUNT > 1 ...

In this situation @@ROWCOUNT will always be 1 because of the SELECT running after the update that saves the error code.

If you need to save both the @@ERROR and @@ROWCOUNT values, use something similar to the code below. You can then refer to @MyErr and @MyCount whenever you want and always get the values from the UPDATE statement.
UPDATE...
SELECT @MyErr = @@ERROR, @MyCount = @@ROWCOUNT

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Post #728911

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