8

I have a stored procedure (SS2k8) with a couple table-valued parameters that will sometimes be null or empty. I have seen this StackOverflow post that says that null/empty TVPs should simply be omitted from the calling parameter list. My problem is that I can't figure out how to check for empty or null inside the stored procedure as "IF (@tvp IS NULL)" fails on procedure creation with the message 'Must declare the scalar variable "@tvp"'. Do I have to do a SELECT COUNT(*) on the TVP and check for zero?

Code excerpt:

CREATE PROCEDURE [foo] (@tvp [TvpType] READONLY) AS

IF (@tvp IS NOT NULL) -- doesn't work
BEGIN
  -- lots of expensive processing
END
ELSE
BEGIN
  -- a little bit of cheap processing
END
...
13

A table can't be NULL, nor can a TVP. How do you check if a table is empty? You certainly don't say IF Sales.SalesOrderHeader IS NULL. :-)

IF EXISTS (SELECT 1 FROM @tvp)
BEGIN
  -- lots of expensive processing
END
ELSE
BEGIN
  -- a little bit of cheap processing
END
...
3

The table valued parameter isn't going to be null. Treat it more like a table and @aaraon Bertrand beat me to the punch. So yes, check for whether there are rows.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.