XQuery 在属性中拉取数据

Question

我有这个疑问

;WITH XMLNAMESPACES ('http://schemas.microsoft.com/sqlserver/DMF/2007/08'AS DMF)
       SELECT
             Res.Expr.value('(../DMF:ResultDetail/Operator/Attribute/@ResultValue)[1]', 'nvarchar(150)') AS [Trying_to_Show_ResultValue_from_XML_Below]
             ,CAST(Expr.value('(../DMF:ResultDetail)[1]', 'nvarchar(max)')AS XML) AS ResultDetail
       FROM [SomeTable_With_EvaluationResults_XML_Column] AS PH
       CROSS APPLY EvaluationResults.nodes('
      declare default element namespace "http://schemas.microsoft.com/sqlserver/DMF/2007/08";
      //TargetQueryExpression'
       ) AS Res(Expr)

生成 XML 类型的第二列 ResultDetail

<Operator>
  <Attribute>
    <?char 13?>
    <TypeClass>DateTime</TypeClass>
    <?char 13?>
    <Name>LastBackupDate</Name>
    <?char 13?>
    <ResultObjType>System.DateTime</ResultObjType>
    <?char 13?>
    <ResultValue>638320511970000000</ResultValue>
    <?char 13?>
  </Attribute>
</Operator>

我试图在上面的 SELECT 子句的第一列中显示 ResultValue 属性。 有什么帮助如何建立这条线吗？谢谢你。

Answer 1

未提供最小可重现示例。所以，我是从臀部开始拍摄的。

SQL

-- DDL and sample data population, start
DECLARE @tbl TABLE (ID INT IDENTITY PRIMARY KEY, EvaluationResults XML);
INSERT @tbl (EvaluationResults) VALUES
(N'<DMF:ResultDetail xmlns:DMF="http://schemas.microsoft.com/sqlserver/DMF/2007/08">
    <Operator>
        <Attribute>
            <?char 13?>
            <TypeClass>DateTime</TypeClass>
            <?char 13?>
            <Name>LastBackupDate</Name>
            <?char 13?>
            <ResultObjType>System.DateTime</ResultObjType>
            <?char 13?>
            <ResultValue>638320511970000000</ResultValue>
            <?char 13?>
        </Attribute>
    </Operator>
</DMF:ResultDetail>');
-- DDL and sample data population, end

WITH XMLNAMESPACES ('http://schemas.microsoft.com/sqlserver/DMF/2007/08'AS DMF)
SELECT t.ID
    , c.value('(Attribute/ResultValue/text())[1]', 'VARCHAR(50)') AS ResultValue 
    , c.query('.') AS ResultDetail 
FROM @tbl AS t
CROSS APPLY EvaluationResults.nodes('/DMF:ResultDetail/Operator') AS t1(c);