T-SQL 中的 XML 解析

Question

我正在嘗試在 T-SQL 中解析 XML 文檔。 當有一些客戶端時，XML 文檔看起來像：

<?xml version="1.0" encoding="utf-16"?> 
<ArrayOfServerSettings>
   <ServerSettings>
     <Address>10.0.1.1</Address>
     <Nodes>
        <NodeSettings>
            <PortNumber>5000</PortNumber>
            <ClientIds>
                <int>1</int>
                <int>2</int>
                <int>3</int>
            </ClientIds>
        </NodeSettings>
      </Nodes>
   </ServerSettings>
</ArrayOfServerSettings>

如果沒有任何客戶，它看起來像

<?xml version="1.0" encoding="utf-16"?> 
<ArrayOfServerSettings>
   <ServerSettings>
     <Address>10.0.1.1</Address>
     <Nodes>
        <NodeSettings>
            <PortNumber>5000</PortNumber>
            <ClientIds />
        </NodeSettings>
      </Nodes>
   </ServerSettings>
</ArrayOfServerSettings>

在第一種情況下，表格應如下所示

Address     PortNumber     ClientId
10.0.1.1      5000           1
10.0.1.1      5000           2
10.0.1.1      5000           3

當沒有客戶端時，我應該像這樣解析它們

Address     PortNumber     ClientId
10.0.1.1      5000           0

這是我的 t-sql 語句

declare @xml XML
set @xml = N'<?xml version="1.0" encoding="utf-16"?>
<ArrayOfCalculationServerSettings>
   <CalculationServerSettings>
      <Address>10.0.1.1</Address>
      <Nodes>
         <NodeSettings>
            <PortNumber>10009</PortNumber>
            <ClientIds>
               <int>1</int>
               <int>2</int>
               <int>3</int>
            </ClientIds>
         </NodeSettings>
      </Nodes>
  </CalculationServerSettings>

'

DECLARE @DocID INT 
EXEC sp_xml_preparedocument @DocID OUTPUT, @xml

SELECT *   
FROM
    OPENXML(@DocID, '/ArrayOfServerSettings/ServerSettings/Nodes/NodeSettings/ClientIds/int', 1)
    WITH (
        Address NVARCHAR(256) '../../../../Address[1]',
        PortNumber    INT           '../../PortNumber[1]',
        ClientID      INT           '.'
    ) AS D0

EXEC sp_xml_removedocument @DocID

但我的方法不適用於第二種選擇

Answer 1

如果我們可以假設您有有效的 XML（您的不是），並且您只有 1 個 PortNumber 節點，您可以這樣做：

declare @xml XML
set @xml = N'<?xml version="1.0" encoding="utf-16"?>
<ArrayOfCalculationServerSettings>
   <CalculationServerSettings>
      <Address>10.0.1.1</Address>
      <Nodes>
         <NodeSettings>
            <PortNumber>10009</PortNumber>
            <ClientIds>
               <int>1</int>
               <int>2</int>
               <int>3</int>
            </ClientIds>
         </NodeSettings>
      </Nodes>
  </CalculationServerSettings>
</ArrayOfCalculationServerSettings>'; --This is missing in your XML

SELECT ACSS.CSS.value('(Address/text())[1]','nvarchar(15)') AS Address,
       ACSS.CSS.value('(Nodes/NodeSettings/PortNumber/text())[1]','int') AS PortNumber, --I assume always the same port number
       ISNULL(CS.I.value('text()[1]','int'),0) AS int
FROM @xml.nodes('ArrayOfCalculationServerSettings/CalculationServerSettings') ACSS(CSS)
     OUTER APPLY ACSS.CSS.nodes('Nodes/NodeSettings/ClientIds/int')CS(I);

如果您有多個端口號，並且具有更多int值，那么您需要對nodes方法進行一些進一步的嵌套。