Question

这与XML Query and Retrieving Node Value 有关。

我现在可以查看XML值，并且需要将更新限制为仅这些列。我的结果继续插入NULL值。 XML中有数据。我在前面的问题中只提供了一个小集合，但是有50个节点。

我的示例如下

`Update @temptable_all
    SET Headline = F.X.value('(.[@id="Headline"]/value/text())[1]','nvarchar(512)')
    SET Credits = F.X.value('(.[@id="Credit"]/value/text())[1]','nvarchar(8)')
    FROM @temptable_all ta
    CROSS APPLY
        cross apply T.Attributes.nodes('/cpCollection/group') as I(attributes)
        cross apply I.attributes.nodes('property') as F(X)
    WHERE ta.ArticleId = T.DataId`

更详细的XML示例：

`<cpCollection moduleId="cc5005f4-f1ea-433e-b187-8b769170eae4" dataId="0a0e2ddf-2a38-4739-9a52-000f9698978f">
  <group id="Serialize" name="Serialize">
    <property id="Title">
      <value>One</value>
    </property>
    <property id="StartDate">
      <value>1/1/2019</value>
    </property>
    <property id="EndDate">
      <value>12/31/2019</value>
    </property>
    <property id="Headline">
      <value>One, Two, Three</value>
    </property>
    <property id="Credit">
      <value>0.25</value>
    </property>
  </group>
</cpCollection>`

Answer 1

    DECLARE @cpsys_DataCurrent TABLE ( xmltext XML);
    INSERT INTO  @cpsys_DataCurrent (xmltext)
    VALUES 
    ( N'<cpCollection moduleId="cc5005f4-f1ea-433e-b187-8b769170eae4" dataId="0a0e2ddf-2a38-4739-9a52-000f9698978f">
      <group id="Serialize" name="Serialize">
        <property id="Title">
          <value>One</value>
        </property>
        <property id="StartDate">
          <value>1/1/2019</value>
        </property>
        <property id="EndDate">
          <value>12/31/2019</value>
        </property>
        <property id="Headline">
          <value>One, Two, Three</value>
        </property>
        <property id="Credit">
          <value>0.25</value>
        </property>
      </group>
    </cpCollection>');

    DECLARE @temptable_all TABLE (ArticleId nvarchar(36), HeadLine nvarchar(512), Credits nvarchar(8));
    INSERT INTO @temptable_all (ArticleId,HeadLine,Credits)
    VALUES 
         ('0a0e2ddf-2a38-4739-9a52-000f9698978f',null,null)
        ,('0000000-000000',N'SomeThing',N'SomeMore');
    --Test selected records 
        SELECT ta.ArticleId,
               T.xmltext.value('(cpCollection/@dataId)[1]','nvarchar(100)') as DataId,
    T.xmltext.value('(/cpCollection/group/property[@id="Headline"]/value/text())[1]','nvarchar(512)') AS HeadLine, 
    T.xmltext.value('(/cpCollection/group/property[@id="Credit"]/value/text())[1]','nvarchar(8)') AS Credits
    FROM @temptable_all ta 
    INNER JOIN  @cpsys_DataCurrent  AS T 
            ON ta.ArticleId = T.xmltext.value('(cpCollection/@dataId)[1]','nvarchar(100)');

    --Actual update query
    UPDATE @temptable_all 
        SET Headline = T.xmltext.value('(/cpCollection/group/property[@id="Headline"]/value/text())[1]','nvarchar(512)') , 
            Credits = T.xmltext.value('(/cpCollection/group/property[@id="Credit"]/value/text())[1]','nvarchar(8)') 
        FROM @temptable_all ta 
        INNER JOIN  @cpsys_DataCurrent  AS T 
            ON ta.ArticleId = T.xmltext.value('(cpCollection/@dataId)[1]','nvarchar(100)');

    --Select after updating
    SELECT ArticleId,HeadLine,Credits FROM @temptable_all;

“测试所选记录”的结果：

    ArticleId                                   DataId                          HeadLine    Credits
    0a0e2ddf-2a38-4739-9a52-000f9698978f    0a0e2ddf-2a38-4739-9a52-000f9698978f    One, Two, Three 0.25

“更新后选择”的结果：

    ArticleId                                   HeadLine    Credits
    0a0e2ddf-2a38-4739-9a52-000f9698978f    One, Two, Three 0.25
    0000000-000000  SomeThing   SomeMore

XML查询和使用ID检索节点值

1 个答案: