從SQL生成XML nil ='true'

下面的示例代碼生成3行輸出，前2個是正確的，但是，我需要第三個渲染出xsi：nil = true的根元素。

非常感謝。

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

來源

2015-09-01 Jonnie

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

感謝您花時間回覆，但是，這兩個頁面都不能回答我問的問題。添加XSINIL參數到ELEMENTS指令設置內部元素'IndexDescription'和'Value''xsi：nil =「true」'，而不是根元素'ComparativeInvestments' – Jonnie

剛將XSINIL添加到您的ELEMENTS中。這是缺少的嗎？

編輯：有了這一招，你可以創建一個XSI：零上一級，如果這兩個元素是空的，但我寧願去想設計...

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;

還有一個嘗試：

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;

來源

2015-09-01 11:36:12 Shnugo

謝謝，但我恐怕不會，這會將IndexDescription和Value設置爲的xsi：零，而不是根元素 'ComparativeInvestments'：<值xsi：nil =「true」/> – Jonnie

@JonathonRalfe，根元素本身是否應該是NULL？我編輯我的答案，但我覺得有什麼不對的設計... – Shnugo

感謝@Shnugo，這似乎給我一個很好XSI：無=真上ComparisonValue，而不是根元素ComparisonInvestment上。我瞭解到，您對根元素非常不空點，但這個位於這是其他地方縫合在一起的SSIS包內，所以是不是真正的根元素，但我的雙手被縛。 – Jonnie

我最終選擇的選項是嵌套兩個select語句，丟失了XMLRoot元素，轉而將兩個單獨的XML PATH語句應用於外部（舊根）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

這讓我在XML所需的輸出：[：指定XSINIL與ELEMENTS指令實施例：（https://msdn.microsoft.com/en-

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

來源

2015-09-01 16:43:35 Jonnie

從SQL生成XML nil ='true'

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