sql - SQL Server 2008 查询中的 XML 数据类型

Question

我在 SQL Server 中有一个表，其中一列是 XML 数据类型。表中还有其他非 XML 列。以下是存储在列中的 XML 示例:

<AdultAsthma>
  <Group>
    <Question text="Act Score:" ForeColor="Green" />
    <Controls>
      <Control type="Label" id="txtScore" text="Enter ACT Score:" ForeColor="Black" />
      <Control type="TextBox" id="txtActScore" Answer="" />
    </Controls>
  </Group>
</AdultAsthma>

我想要的是一个匹配表中其他列的某些值的查询，对于匹配的那些列，我想从问题节点获取文本属性，从控制节点获取答案属性。有人可以帮我解决这个问题吗？

编辑

如果我有多个组节点，需要更改什么？在这个场景中，我希望每个问题的文本和答案都与每个问题一起出现。见下文:

<AdultAsthma>
  <Group>
    <Question text="Act Score:" ForeColor="Green" />
    <Controls>
      <Control type="Label" id="txtScore" text="Enter ACT Score:" ForeColor="Black" />
      <Control type="TextBox" id="txtActScore" Answer="" />
    </Controls>
  </Group>
  <Group>
    <Question text="Do You Have Asthma?:" ForeColor="Black" />
    <Controls>
      <Control type="RadioButton" id="rbHaveAsthmaYes" text="Yes" GroupName="Diagnosed" ForeColor="Black" Answer="False" />
      <Control type="RadioButton" id="rbHaveAsthmaNo" text="No" GroupName="Diagnosed" ForeColor="Black" Answer="False" />
    </Controls>
  </Group>
</AdultAsthma>

Answer 1

declare @T table
(
  XMLCol xml
)

insert into @T values
('<AdultAsthma>
  <Group>
    <Question text="Act Score:" ForeColor="Green" />
    <Controls>
      <Control type="Label" id="txtScore" text="Enter ACT Score:" ForeColor="Black"/>
      <Control type="TextBox" id="txtActScore" Answer="Answer" />
    </Controls>
  </Group>
</AdultAsthma>
')

select XMLCol.value(N'(/AdultAsthma/Group/Question/@text)[1]', 'nvarchar(max)'),
       XMLCol.value(N'(/AdultAsthma/Group/Controls/Control/@Answer)[1]', 'nvarchar(max)')
from @T

更新:

当您需要将 XML 分解为多行时，您可以在 cross apply 中使用 .nodes()。

declare @T table
(
  XMLCol xml
)

insert into @T values
('<AdultAsthma>
  <Group>
    <Question text="Act Score:" ForeColor="Green" />
    <Controls>
      <Control type="Label" id="txtScore" text="Enter ACT Score:" ForeColor="Black" />
      <Control type="TextBox" id="txtActScore" Answer="" />
    </Controls>
  </Group>
  <Group>
    <Question text="Do You Have Asthma?:" ForeColor="Black" />
    <Controls>
      <Control type="RadioButton" id="rbHaveAsthmaYes" text="Yes" GroupName="Diagnosed" ForeColor="Black" Answer="False" />
      <Control type="RadioButton" id="rbHaveAsthmaNo" text="No" GroupName="Diagnosed" ForeColor="Black" Answer="False" />
    </Controls>
  </Group>
</AdultAsthma>
')

select X.N.value(N'(Question/@text)[1]', 'nvarchar(max)'),
       X.N.value(N'(Controls/Control/@Answer)[1]', 'nvarchar(max)')
from @T as T
  cross apply T.XMLCol.nodes(N'/AdultAsthma/Group') as X(N)