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Passing CSV to Stored Procedure

There are many occasions when it would be easier to pass an array of values to a Stored Procedure instead of looping.

This can be done and is very simple to use once implemented, all it needs is a new UDF (User Defined Function).

CREATE FUNCTION dbo.CSVToList (@CSV varchar(3000)) 
    RETURNS @Result TABLE (Value varchar(30))
AS   
BEGIN
    DECLARE @List TABLE
    (
        Value varchar(30)
    )

    DECLARE
        @Value varchar(30),
        @Pos int

    SET @CSV = LTRIM(RTRIM(@CSV))+ ','
    SET @Pos = CHARINDEX(',', @CSV, 1)

    IF REPLACE(@CSV, ',', '') <> ''
    BEGIN
        WHILE @Pos > 0
        BEGIN
            SET @Value = LTRIM(RTRIM(LEFT(@CSV, @Pos - 1)))

            IF @Value <> ''
                INSERT INTO @List (Value) VALUES (@Value) 

            SET @CSV = RIGHT(@CSV, LEN(@CSV) - @Pos)
            SET @Pos = CHARINDEX(',', @CSV, 1)
        END
    END     

    INSERT @Result
    SELECT
        Value
    FROM
        @List
    
    RETURN
END

Then to use this you only need to do the following:

DECLARE @CSV varchar(100)
SET @CSV = '30,32,34,36,40'

SELECT 
    ProductID, 
    ProductName, 
    UnitPrice
FROM 
    Products
WHERE
    ProductID IN (SELECT * FROM dbo.CSVToLIst(@CSV))

Author Greg Duffield

Greg has too many years experience in developement from VB for DOS all the way through to Windows Workflow and LINQ while covering pretty much every technology in between. A complete MS evangelist he is now Director of the only MS Gold Partner IT services company in Norfolk. Wehere they are producing Web 2 Applications for various sectors, and are currently entering the Haulage industry with their latest product.

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