从SQL生成XML nil ='true'

下面的示例代码生成3行输出，前2个是正确的，但是，我需要第三个渲染出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

来源

2015-09-01 Jonnie

首先打谷歌我们/库/ bb510413％28V = sql.120％29.aspx）。第二次谷歌命中：[用XSINIL参数生成NULL值元素]（https://msdn.microsoft.com/en-us/library/ms178079%28v=sql.120%29.aspx）。 – GSerg

感谢您花时间回复，但是，这两个页面都不能回答我问的问题。添加XSINIL参数到ELEMENTS指令设置内部元素'IndexDescription'和'Value''xsi：nil =“true”'，而不是根元素'ComparativeInvestments' – Jonnie

刚将XSINIL添加到您的ELEMENTS中。这是缺少的吗？

编辑：有了这一招，你可以创建一个XSI：零上一级，如果这两个元素是空的，但我宁愿去想设计...

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;

还有一个尝试：

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;

来源

2015-09-01 11:36:12 Shnugo

谢谢，但我恐怕不会，这会将IndexDescription和Value设置为的xsi：零，而不是根元素 'ComparativeInvestments'：<值xsi：nil =“true”/> – Jonnie

@JonathonRalfe，根元素本身是否应该是NULL？我编辑我的答案，但我觉得有什么不对的设计... – Shnugo

感谢@Shnugo，这似乎给我一个很好XSI：无=真上ComparisonValue，而不是根元素ComparisonInvestment上。我了解到，您对根元素非常不空点，但这个位于这是其他地方缝合在一起的SSIS包内，所以是不是真正的根元素，但我的双手被缚。 – Jonnie

我最终选择的选项是嵌套两个select语句，丢失了XMLRoot元素，转而将两个单独的XML PATH语句应用于外部（旧根）元素。

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

这让我在XML所需的输出：[：指定XSINIL与ELEMENTS指令实施例：（https://msdn.microsoft.com/en-

<ComparativeInvestments xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>

来源

2015-09-01 16:43:35 Jonnie

从SQL生成XML nil ='true'

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