Question

I have a stored procedure that returns me a set of data based on 2 input parameters. One of the parameter is optional so I am using

WHERE 
(tbl_Process.ProjectID = @ProjectID)
AND 
(tbl_AnalysisLookup.AnalysisCodeID = 7)
AND
(tbl_ProcessSubStep.ProcessID = ISNULL(@ProcessID,tbl_ProcessSubStep.ProcessID))

The @ProcessID is optional parameter so the user may/may not provide it.
Now I need to change my stored procedure to accommodate multiple ProcessId’s i.e. the user can now select a list of multiple ProcessId’s, Single ProcessID or No ProcessID and the stored proc should handle all these scenarios. What is the best way to achieve this without using Dynamic queries unless absolutely required.
In a nutshell, I wanted my stored proc to handle optional parameters with multiple values(WHERE IN Clause). The solution and relative link to the webpage I got it from has been provided below. It’s a very good article and will help you to choose the right solution based on your requirements.

Answer 1

I have finally figured out how to achieve this. There are a couple of ways to do this, what I am using now is a function to split a string of ProcessID’s based on delimiter and Then Inserting them into a table. Then using that table in my stored proc. Here is the code and the link to the webpage.

http://www.codeproject.com/Articles/58780/Techniques-for-In-Clause-and-SQL-Server

CREATE FUNCTION [dbo].[ufnDelimitedBigIntToTable]
(
@List varchar(max), @Delimiter varchar(10)
)
RETURNS @Ids TABLE
(Id bigint) AS
BEGIN
DECLARE @list1 VARCHAR(MAX), @Pos INT, @rList VARCHAR(MAX)
SET @List = LTRIM(RTRIM(@List)) + @Delimiter
SET @pos = CHARINDEX(@Delimiter, @List, 1)
WHILE @pos > 0
    BEGIN
    SET @list1 = LTRIM(RTRIM(LEFT(@List, @pos - 1)))
    IF @list1 <> ''
        INSERT INTO @Ids(Id) VALUES (CAST(@list1 AS bigint))
    SET @List = SUBSTRING(@List, @pos+1, LEN(@List))
    SET @pos = CHARINDEX(@Delimiter, @list, 1)
END
RETURN 
END

Once made, the table-function can be used in a query:

 Collapse | Copy Code
CREATE PROCEDURE [dbo].[GetUsingDelimitedFunctionTable]
@Ids varchar(max)
AS
BEGIN
SET NOCOUNT ON
SELECT s.Id,s.SomeString 
FROM SomeString s (NOLOCK)
WHERE EXISTS ( SELECT *
               FROM ufnDelimitedBigIntToTable(@Ids,',') Ids
               WHERE s.Id = Ids.id )
END

The Link also provides more ways to achieve this.