1

有没有办法从 SSIS 的派生列转换中执行标量值函数？

-设想-

我的源数据库中有一个函数可以根据记录的 UOM 列中的 UOM 值转换权重。我想在 ETL 过程中利用这个功能来确保我的体重测量值始终是磅。我可以从派生列中调用此函数吗？如果没有，我是否可以在数据流中使用另一个转换任务（试图避免暂存列）？

dbo.Tasks 表

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

dbo.MeasurementUnits 表

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

dbo.GetConvertedWeight 函数

    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

示例函数调用

dbo.GetConvertedWeight(dbo.Tasks.netWeight, dbo.Tasks.weightUOM, 14) AS netWeight
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1 回答 1

2

没有。您需要的是一个OLE DB 命令来执行此操作。将结果发送到输出列，生活应该对你充满热情——至少在 SSIS 方面。

于 2009-06-12T15:33:10.820 回答