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昨天我从一个 SO 用户那里得到了一些很棒的帮助（见这里），这让我朝着我的目标取得了很大的进步。现在我正在尝试确定是否可以将建议的神奇添加嵌入到生成 xml 输出的现有查询中。

现有查询如下：

PROCEDURE [dbo].[CreateLandingPurchaseOrderDetails]

-- Add the parameters for the stored procedure here


@startDate DATE,
@endDate DATE


AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    SELECT (SELECT
            Contacts.ContactId AS '@ContactId',
            VesselOwner AS '@Owner',
            FORMAT(SUM(LandingDetails.Quantity * LandingDetails.UnitPrice), 'N2') AS '@Owed',
            SocietyMemberships.WeeklyDeductionRate AS '@WeeklyDeductionRate',
            SocietyMemberships.FromMinimumReturn AS '@FromMinimumReturn',
            Deductions.DeductionRate AS '@DeductionRate',


            (SELECT DISTINCT
                ld1.ProductId AS '@ProductId',
                FORMAT(AVG(ld1.UnitPrice), 'N2') AS '@Cost',
                FORMAT(SUM(ld1.Quantity), 'N2') AS '@Quantity'


            FROM LandingDetails ld1
            INNER JOIN dbo.LandingHeaders lh1
                ON ld1.LandingId = lh1.LandingId
            WHERE Posted = 0
            AND lh1.VesselOwner = LandingHeaders.VesselOwner
            GROUP BY ld1.ProductId
            FOR XML PATH ('Products'), TYPE)

        FROM dbo.LandingDetails
        INNER JOIN dbo.LandingHeaders
            ON LandingDetails.LandingId = LandingHeaders.LandingId
        INNER JOIN dbo.Vessels
            ON LandingHeaders.VesselId = Vessels.VesselId
        INNER JOIN dbo.Contacts
            ON Vessels.OwnerId = Contacts.ContactId
        INNER JOIN dbo.SocietyMemberships
            ON Contacts.SocietyId = SocietyMemberships.SocietyId
        INNER JOIN dbo.Deductions
            ON Vessels.DeductionId = Deductions.DeductionId
        WHERE LandingHeaders.Posted = 0
        AND LandingDate1 BETWEEN @startDate AND @endDate
        GROUP BY    ContactId,
                    VesselOwner,
                    SocietyMemberships.WeeklyDeductionRate,
                    SocietyMemberships.FromMinimumReturn,
                    Deductions.DeductionRate
        ORDER BY ContactId

        FOR XML PATH ('Owner'), TYPE)

    FOR XML PATH ('PurchaseOrders'), TYPE

END

这会沿着这些线产生 xml 输出；

<PurchaseOrders>
  <Owner ContactId="39" Owner="Paul Joy" Owed="1,609.39" WeeklyDeductionRate="10.00" FromMinimumReturn="110.00" DeductionRate="0.0150">
    <Products ProductId="33" Cost="5.00" Quantity="0.40" />
    <Products ProductId="34" Cost="1.80" Quantity="0.90" />
    <Products ProductId="41" Cost="2.30" Quantity="1.30" />

我想向 Owner 元素（ TotalDeductions ）再添加一个属性。从我问的上一个问题中，我可以看到 sql 如何计算我所追求的信息以生成总扣除额字段。然而，将这种逻辑添加到 FOR XML 查询中被证明是难以捉摸的。我不愿意说它不能完成，因为在 SQL 中，如果有一点横向思考，似乎几乎没有什么是不能完成的。

如果我只是将查询的大小写部分剪切并粘贴到我的 FOR XML 查询中，编译器会指出 Owed 不是有效名称。我明白了。但是，如果我只是按以下方式嵌入 for xml 的所有者部分；

WITH cte AS (
 'embed the part of the FOR XML producing the owner element here
)

SELECT 
    ContactId,
    Owed,
    WeeklyDeductionRate,
    FromMinimumReturn,
    DeductionRate,
    CASE 
       WHEN Owed - (Owed * DeductionRate + WeeklyDeductionRate) > FromMinimumReturn 
       THEN Owed * DeductionRate + WeeklyDeductionRate
       ELSE Owed * DeductionRate END
    AS TotalDeductions
FROM cte

然后暂时将编译错误放在一边，我不会生成我所追求的 xml。

我是否终于找到了一些在 SQL 中实际上无法完成的事情，或者我只是错过了我应该有的明显的“横向想法”？

谢谢

4

1 回答 1

1

我认为在正确的位置插入原始 case 表达式应该可以。尝试这个：

PROCEDURE [dbo].[CreateLandingPurchaseOrderDetails]

-- Add the parameters for the stored procedure here
@startDate DATE, @endDate DATE

AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    SELECT (
       SELECT
            Contacts.ContactId AS '@ContactId',
            LandingHeaders.VesselOwner AS '@Owner',
            FORMAT(SUM(LandingDetails.Quantity * LandingDetails.UnitPrice), 'N2') AS '@Owed',
            SocietyMemberships.WeeklyDeductionRate AS '@WeeklyDeductionRate',
            SocietyMemberships.FromMinimumReturn AS '@FromMinimumReturn',
            Deductions.DeductionRate AS '@DeductionRate',

          CASE 
             WHEN SUM(LandingDetails.Quantity * LandingDetails.UnitPrice) - (SUM(LandingDetails.Quantity * LandingDetails.UnitPrice) * DeductionRate + WeeklyDeductionRate) > FromMinimumReturn 
             THEN SUM(LandingDetails.Quantity * LandingDetails.UnitPrice) * DeductionRate + WeeklyDeductionRate
             ELSE SUM(LandingDetails.Quantity * LandingDetails.UnitPrice) * DeductionRate 
          END AS '@TotalDeductions',

            (SELECT DISTINCT
                ld1.ProductId AS '@ProductId',
                FORMAT(AVG(ld1.UnitPrice), 'N2') AS '@Cost',
                FORMAT(SUM(ld1.Quantity), 'N2') AS '@Quantity'

            FROM LandingDetails ld1
            INNER JOIN dbo.LandingHeaders lh1
                ON ld1.LandingId = lh1.LandingId
            WHERE Posted = 0
            AND lh1.VesselOwner = LandingHeaders.VesselOwner
            GROUP BY ld1.ProductId
            FOR XML PATH ('Products'), TYPE)

        FROM dbo.LandingDetails
        INNER JOIN dbo.LandingHeaders
            ON LandingDetails.LandingId = LandingHeaders.LandingId
        INNER JOIN dbo.Vessels
            ON LandingHeaders.VesselId = Vessels.VesselId
        INNER JOIN dbo.Contacts
            ON Vessels.OwnerId = Contacts.ContactId
        INNER JOIN dbo.SocietyMemberships
            ON Contacts.SocietyId = SocietyMemberships.SocietyId
        INNER JOIN dbo.Deductions
            ON Vessels.DeductionId = Deductions.DeductionId
        WHERE LandingHeaders.Posted = 0
        AND LandingDate1 BETWEEN @startDate AND @endDate
        GROUP BY    ContactId,
                    LandingHeaders.VesselOwner,
                    SocietyMemberships.WeeklyDeductionRate,
                    SocietyMemberships.FromMinimumReturn,
                    Deductions.DeductionRate
        ORDER BY ContactId

        FOR XML PATH ('Owner'), TYPE)

    FOR XML PATH ('PurchaseOrders'), TYPE

END

查询可能可以改进，但没有表定义和一些示例数据，测试它有点困难。

查看这个SQL Fiddle以获得稍微调整过的版本，它应该会给出相同的结果。

于 2015-07-05T13:33:31.793 回答