t-sql：創建並添加幾個命名空間到xml

Question

我有點新的工作與XML在SQL中，並必須建立一個這樣的XML My Xml 並替換正確的值在哪裏（...）出現。

替換不是我的問題，否則創建出現在上一張圖片上的幾個名稱空間是。

DECLARE @XML XML 

SET @XML = (SELECT 
       (SELECT 
        (SELECT 'http://www.w3.org/2001/10/xmlexcc14n#' "@Algorithm" 
         FOR XML PATH('CanonicalizationMethod'), TYPE), 
        (SELECT 'http://www.w3.org/2001/04/xmldsigmore#rsasha256' "@Algorithm" 
         FOR XML PATH('SignatureMethod'), TYPE), 
        (SELECT '#FATCA' "@URI", 
          (SELECT 
            (SELECT 'http://www.w3.org/2001/10/xmlexcc14n#' "@Algorithm" 
             FOR XML PATH('Transform'), TYPE) 
           FOR XML PATH('Transforms'), TYPE), 
          (SELECT 'http://www.w3.org/2001/04/xmlenc#sha256' "@Algorithm" 
           FOR XML PATH('DigestMethod'), TYPE), 
          (SELECT '' 
           FOR XML PATH('DigestValue'), TYPE) 
         FOR XML PATH('Reference'), TYPE)        
       FOR XML PATH('SignedInfo'), TYPE), 
       (SELECT '' 
       FOR XML PATH('SignatureValue'), TYPE), 
       (SELECT 
        (SELECT 
          (SELECT '' 
           FOR XML PATH('X509SubjectName'), TYPE), 
          (SELECT '' 
           FOR XML PATH('X509Certificate'), TYPE) 
         FOR XML PATH('X509Data'), TYPE) 
       FOR XML PATH('KeyInfo'), TYPE), 
       (SELECT 'FATCA' "@Id", 
         (SELECT 
          (SELECT 
            (SELECT '' 
             FOR XML PATH('SendingCompanyIN'), TYPE), 
            (SELECT '' 
             FOR XML PATH('TransmittingCountry'), TYPE), 
            (SELECT '' 
             FOR XML PATH('ReceivingCountry'), TYPE), 
            (SELECT '' 
             FOR XML PATH('MessageType'), TYPE), 
            (SELECT '' 
             FOR XML PATH('Warning'), TYPE), 
            (SELECT '' 
             FOR XML PATH('Contact'), TYPE), 
            (SELECT '' 
             FOR XML PATH('MessageRefId'), TYPE), 
            (SELECT '' 
             FOR XML PATH('ReportingPeriod'), TYPE), 
            (SELECT '' 
             FOR XML PATH('Timestamp'), TYPE) 
           FOR XML PATH('MessageSpec'), TYPE), 
          (SELECT '' 
           FOR XML PATH('FATCA'), TYPE) 
         FOR XML PATH('FATCA_OECD'), TYPE) 
       FOR XML PATH('Object'), TYPE) 
      FOR XML PATH('Signature')) 

SELECT @XML 

這是我到目前爲止，它的作品完美。

我已經閱讀過這篇文章https://msdn.microsoft.com/en-us/library/ms177400.aspx，但並沒有真正幫助我，因爲我需要在xml中間使用命名空間並且無法弄清楚它是如何實現的。

有人能幫我嗎？

Answer 1

您可以使用WITH XMLNAMESPACES來創建您需要的XML。將SET更改爲SELECT。

就是這樣。

DECLARE @XML XML; 

WITH XMLNAMESPACES(DEFAULT 'http://www.w3.org/2000/09/xmldsig#', 
        'urn:oecd:ties:fatca:v1' as ftc, 
        'urn:oecd:ties:stffatcatypes' as sfa) 
SELECT @XML = (SELECT 
       (SELECT 
        (SELECT 'http://www.w3.org/2001/10/xmlexcc14n#' "@Algorithm" 
         FOR XML PATH('CanonicalizationMethod'), TYPE), 
        (SELECT 'http://www.w3.org/2001/04/xmldsigmore#rsasha256' "@Algorithm" 
         FOR XML PATH('SignatureMethod'), TYPE), 
        (SELECT '#FATCA' "@URI", 
          (SELECT 
            (SELECT 'http://www.w3.org/2001/10/xmlexcc14n#' "@Algorithm" 
             FOR XML PATH('Transform'), TYPE) 
           FOR XML PATH('Transforms'), TYPE), 
          (SELECT 'http://www.w3.org/2001/04/xmlenc#sha256' "@Algorithm" 
           FOR XML PATH('DigestMethod'), TYPE), 
          (SELECT '' 
           FOR XML PATH('DigestValue'), TYPE) 
         FOR XML PATH('Reference'), TYPE)        
       FOR XML PATH('SignedInfo'), TYPE), 
       (SELECT '' 
       FOR XML PATH('SignatureValue'), TYPE), 
       (SELECT 
        (SELECT 
          (SELECT '' 
           FOR XML PATH('X509SubjectName'), TYPE), 
          (SELECT '' 
           FOR XML PATH('X509Certificate'), TYPE) 
         FOR XML PATH('X509Data'), TYPE) 
       FOR XML PATH('KeyInfo'), TYPE), 
       (SELECT 'FATCA' "@Id", 
         (SELECT 
          (SELECT 
            (SELECT '' 
             FOR XML PATH('sfa:SendingCompanyIN'), TYPE), 
            (SELECT '' 
             FOR XML PATH('sfa:TransmittingCountry'), TYPE), 
            (SELECT '' 
             FOR XML PATH('sfa:ReceivingCountry'), TYPE), 
            (SELECT '' 
             FOR XML PATH('sfa:MessageType'), TYPE), 
            (SELECT '' 
             FOR XML PATH('sfa:Warning'), TYPE), 
            (SELECT '' 
             FOR XML PATH('sfa:Contact'), TYPE), 
            (SELECT '' 
             FOR XML PATH('sfa:MessageRefId'), TYPE), 
            (SELECT '' 
             FOR XML PATH('sfa:ReportingPeriod'), TYPE), 
            (SELECT '' 
             FOR XML PATH('sfa:Timestamp'), TYPE) 
           FOR XML PATH('ftc:MessageSpec'), TYPE), 
          (SELECT '' 
           FOR XML PATH('ftc:FATCA'), TYPE) 
         FOR XML PATH('ftc:FATCA_OECD'), TYPE) 
       FOR XML PATH('Object'), TYPE) 
      FOR XML PATH('Signature')); 

SELECT @XML; 

它看起來不像你在圖片中的樣子，但它在語義上是相同的XML。

更新：

爲了避免命名空間中的子節點腹脹，您可以使用XML變量建立每次一個級別，然後使用該變量在主查詢。

示例代碼：

declare @X xml; 

with xmlnamespaces(default 'N2', 
        'N3' as n3, 
        'N4' as n4) 
select @X = (
      select 2 as Elem2 
      for xml path('n4:SubElem'), type 
      ); 

with xmlnamespaces(default 'N1') 
select 1 as Elem1, 
     @X 
for xml path('Root') 

結果：

<Root xmlns="N1"> 
    <Elem1>1</Elem1> 
    <n4:SubElem xmlns:n4="N4" xmlns:n3="N3" xmlns="N2"> 
    <Elem2>2</Elem2> 
    </n4:SubElem> 
</Root> 

你甚至可以創建你的子節點的功能。

create function [dbo].[GetSubElem]() returns xml 
as 
begin 

    declare @X xml; 

    with xmlnamespaces(default 'N2', 
        'N3' as n3, 
        'N4' as n4) 
    select @X = (
       select 2 as Elem2 
       for xml path('n4:SubElem'), type 
      ); 

    return @x 
end 

並且像這樣使用它。

with xmlnamespaces(default 'N1') 
select 1 as Elem1, 
     dbo.GetSubElem() 
for xml path('Root')