Calling a Scalar-valued Function in SSIS

Question

Is there any way to execute a scalar-valued function from within a Derived Column transformation in SSIS?

-Scenario-

I have a function in my source DB that converts weights based on a UOM value in the record's UOM column. I want to utilize this function in the ETL process to ensure that my weight measures are always pounds. Can I call this function from within a Derived Column? If not, is there another transformation task I could utilize within the Data Flow (trying to avoid staging columns)?

dbo.Tasks table

id |  Name  | netWeight | grossWeight | UOM
12   Task12     30000        50000      10

dbo.MeasurementUnits table

id |   Name    | Shortname | Type | Precision
12  Kilogram kg         3 10000  
14  Pound     lb         3 10000

dbo.GetConvertedWeight function

    ALTER  FUNCTION [dbo].[GetConvertedWeight](@iWeight money, @ifromUOM int, @iToUOM int) 
    RETURNS money
    AS  
    BEGIN 
    DECLARE @lConvertedWeight money, 
            @lKgToGrams money,
            @lLbToGrams money,
            @lOzToGrams money,
            @lWeightInGrams money

    --convert the weight to grams first.
    SELECT @lWeightInGrams = CASE WHEN @iFromUOM = 12 THEN (ISNULL(@iWeight,0) * 1000)
                WHEN @iFromUOM = 14 THEN (ISNULL(@iWeight,0) * 453.5924)
                WHEN @iFromUOM = 15 THEN (ISNULL(@iWeight,0) * 28.3495)
                WHEN @iFromUOM = 13 THEN (ISNULL(@iWeight,0))
                ELSE ISNULL(@iWeight,0)
                 END

    --Convert the converted weight to grams to the desired weight
    SELECT @lConvertedWeight = CASE WHEN @iToUOM = 12 THEN (ISNULL(@lWeightInGrams,0) / 1000)
                   WHEN @iToUOM = 13 THEN ISNULL(@lWeightInGrams,0)
                   WHEN @iToUOM = 14 THEN (ISNULL(@lWeightInGrams,0)/453.5924)
                   WHEN @iToUOM = 15 THEN (ISNULL(@lWeightInGrams,0) / 28.3495 )
                   ELSE (ISNULL(@lWeightInGrams,0)/453.5924)
                   END
RETURN @lConvertedWeight

Example function call

dbo.GetConvertedWeight(dbo.Tasks.netWeight, dbo.Tasks.weightUOM, 14) AS netWeight

Answer 1

Nope. What you'll want is an OLE DB Command to do that. Send the results to an Output Column, and life should be peachy keen for you--at least with regards to SSIS.