Passing a SQL parameter to an IN() clause using typed datasets in .NET

Question

First apologies as there are similar questions on this site, but none of them answer this problem directly.

Im using typed datasets in VS 2010. I create a TableAdapt

Answer 1

You can't use a single parameter for a list of values in this way. But there may be database-specific ways to achieve what you want. For example, with SQL Server 2005 or later you could create a table-valued function to split your string parameter, something like:

CREATE FUNCTION dbo.F_Split
(
@InputString VARCHAR(MAX)
,@Separator VARCHAR(MAX)
)
RETURNS @ValueTable TABLE (Value VARCHAR(MAX))
AS
BEGIN

    DECLARE @SeparatorIndex INT, @TotalLength INT, @StartIndex INT, @Value VARCHAR(MAX)
    SET @TotalLength=LEN(@InputString)
    SET @StartIndex = 1

    IF @Separator IS NULL RETURN

    WHILE @StartIndex <= @TotalLength
    BEGIN
        SET @SeparatorIndex = CHARINDEX(@Separator, @InputString, @StartIndex)
        IF @SeparatorIndex > 0
        BEGIN
            SET @Value = SUBSTRING(@InputString, @StartIndex, @SeparatorIndex-@StartIndex)
            SET @StartIndex = @SeparatorIndex + 1
        END
        ELSE
        BEGIN
            Set @Value = SUBSTRING(@InputString, @StartIndex, @TotalLength-@StartIndex+1)
            SET @StartIndex = @TotalLength+1
        END
        INSERT INTO @ValueTable
        (Value)
        VALUES
        (@Value)
    END

    RETURN
END

You would then use it as follows:

SELECT * from Table WHERE ID IN (SELECT CAST(Value AS INT) FROM F_Split(@IDs, ','))