Question

I have this stored Procedure in MS SQL2008 (C#)

ALTER PROCEDURE UpdateProducts
@ProductID INT, @Name nvarchar(50), @Length Float
AS
UPDATE       Product
SET          Name = @Name, Length = @Length
WHERE        (ProductID = @ProductID)

Length are in some cases “” (nothing). But when “” is inserted the value 0 is inserted instead. I want the value to be null. How can I do that? This did not work:

if (Length == "")
{
   Length = null;            
}

Answer 1

Set the defaults to NULL in the proc and you dont have to explicity pass NULL to a proc.

CREATE PROC ..dbo.Proc ( @param1 int =NULL, @param2 varchar(40) = NULL ,etc)

Also, if you have to send NULL from your app you would use DBNull.Value