Passing multiple values for one SQL parameter

Question

I have a CheckBoxList where users can select multiple items from the list. I then need to be able to pass these values to my Stored Procedure so they can be used in a WHERE

Answer 1

There's a few ways of doing it. You could pass in the parameter as an XML blob like this example:

CREATE PROCEDURE [dbo].[uspGetCustomersXML]
    @CustomerIDs XML
AS
BEGIN
SELECT c.ID, c.Name
FROM [dbo].[Customer] c
JOIN @CustomerIDs.nodes('IDList/ID') AS x(Item) ON c.ID = Item.value('.', 'int' )
END
GO

--Example Use:
EXECUTE [dbo].[uspGetCustomersXML] '110100'

Or pass in the values as CSV and use a split function to split the values out into a table variable (there's a lot of split functions out there, quick search will throw one up).

CREATE PROCEDURE [dbo].[uspGetCustomersCSV]
    @CustomerIDs VARCHAR(8000)
AS
BEGIN
SELECT c.Id, c.Name
FROM [dbo].[Customer] c
JOIN dbo.fnSplit(@CustomerIDs, ',') t ON c.Id = t.item
END
GO

--Example Use:
EXECUTE [dbo].[uspGetCustomersCSV] '1,10,100'

If you were using SQL 2008 or later, you could have used Table Valued Parameters which allow you to pass a TABLE variable in as a parameter. I blogged about these 3 approaches a while back, with a quick performance comparison.