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我正在努力修改一些 SQL 生成的 XML。

以下示例代码生成 3 行输出，前 2 行是正确的，但是，我需要将第 3 行渲染到 xsi:nil=true 的根元素。

非常感谢。

CREATE TABLE #ReportPackComparativeIndices 
(
    ReportPackRequestID INT,
    IndexDescription VARCHAR(250),
    Value DECIMAL(18,1)
)

INSERT INTO #ReportPackComparativeIndices VALUES  (25984,   'ClientIndexID0',   28.3)
INSERT INTO #ReportPackComparativeIndices VALUES  (25984,   'ClientIndexID1',   43.5)
INSERT INTO #ReportPackComparativeIndices VALUES  (25984,   'ClientIndexID2',   81.1)
INSERT INTO #ReportPackComparativeIndices VALUES  (25984,   'ClientIndexID3',   24.5)
INSERT INTO #ReportPackComparativeIndices VALUES  (25985,   'ClientIndexID0',   93.9)
INSERT INTO #ReportPackComparativeIndices VALUES  (25985,   'ClientIndexID1',   53.8)
INSERT INTO #ReportPackComparativeIndices VALUES  (25985,   'ClientIndexID2',   69.3)
INSERT INTO #ReportPackComparativeIndices VALUES  (25985,   'ClientIndexID3',   26.8)
INSERT INTO #ReportPackComparativeIndices VALUES  (25986,   NULL,   NULL)

SELECT * FROM #ReportPackComparativeIndices


-- Render out the XML Fragments
SELECT ti.ReportPackRequestID,
CAST(
(
    SELECT 
        ti2.IndexDescription,
        ti2.Value
    FROM 
        #ReportPackComparativeIndices AS ti2
    WHERE 
        ti.ReportPackRequestID = ti2.ReportPackRequestID
    FOR XML PATH('ComparisonValue'),
        ROOT('ComparativeInvestments'), 
        ELEMENTS, 
        TYPE
) AS NVARCHAR(MAX)) AS XmlFragment
FROM 
    #ReportPackComparativeIndices AS ti
    GROUP BY 
        ti.ReportPackRequestID  
    ORDER BY
        ti.ReportPackRequestID
4

2 回答 2

2

刚刚将 XSINIL 添加到您的 ELEMENTS 中。这是缺少的吗？

编辑：有了这个技巧，你可以创建一个 xsi:nil 上一级，如果两个元素都是 NULL，但我宁愿考虑设计......

    SELECT ti.ReportPackRequestID,
CAST(
(
    SELECT 
        CASE WHEN ti2.IndexDescription IS NULL AND ti2.Value IS NULL THEN 'true' ELSE NULL END AS [@xsi:nil],
        ti2.IndexDescription,
        ti2.Value
    FROM 
        #ReportPackComparativeIndices AS ti2
    WHERE 
        ti.ReportPackRequestID = ti2.ReportPackRequestID
    FOR XML PATH('ComparisonValue'),
        ROOT('ComparativeInvestments'), 
        ELEMENTS XSINIL, 
        TYPE
) AS NVARCHAR(MAX)) AS XmlFragment
FROM 
    #ReportPackComparativeIndices AS ti
    GROUP BY 
        ti.ReportPackRequestID  
    ORDER BY
        ti.ReportPackRequestID;

又一次尝试：

SELECT ti.ReportPackRequestID,
CAST(
(
    SELECT 
        CASE WHEN ti2.IndexDescription IS NULL AND ti2.Value IS NULL THEN 'true' ELSE NULL END AS [ComparativeInvestments/@xsi:nil],
        ti2.IndexDescription AS [ComparativeInvestments/ComparisonValue/IndexDescription],
        ti2.Value AS [ComparativeInvestments/ComparisonValue/Value]
    FROM 
        #ReportPackComparativeIndices AS ti2
    WHERE 
        ti.ReportPackRequestID = ti2.ReportPackRequestID
    FOR XML PATH('dummy'),
        ELEMENTS XSINIL, 
        TYPE
) AS NVARCHAR(MAX)) AS XmlFragment
FROM 
    #ReportPackComparativeIndices AS ti
    GROUP BY 
        ti.ReportPackRequestID  
    ORDER BY
        ti.ReportPackRequestID;
于 2015-09-01T11:36:12.090 回答
1

我最终选择的选项是嵌套两个丢失 XMLRoot 元素的 select 语句，以支持将 XSINIL 应用于外部（旧根）元素的两个单独的 XML PATH 语句。

SELECT ti.ReportPackRequestID,
CAST(
(
    SELECT
    (
        SELECT 
            CASE WHEN ti2.IndexID IS NOT NULL 
                 THEN 'ClientIndexID' + CAST(ti2.RowNumber -1 AS VARCHAR(5)) 
                 ELSE NULL
            END AS IndexID,
            ti2.IndexTotalReturn AS Value
        FROM 
            #ReportPackComparativeIndices AS ti2
        WHERE 
            ti.ReportPackRequestID = ti2.ReportPackRequestID
        ORDER BY 
            ti2.RowNumber
        FOR XML PATH('ComparisonValue'), 
            ELEMENTS, 
            TYPE
    )
    FOR XML PATH('ComparativeInvestments'), 
        ELEMENTS XSINIL, 
        TYPE
) AS NVARCHAR(MAX)) AS XmlFragment
FROM 
    #ReportPackComparativeIndices AS ti
GROUP BY 
    ti.ReportPackRequestID  
ORDER BY
    ti.ReportPackRequestID

这让我得到了 XML 中所需的输出：

<ComparativeInvestments xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>
于 2015-09-01T16:43:35.383 回答