T-SQL 查找具有匹配文本的节点并从 XML 字段中的兄弟节点中提取值

Question

我有一个包含如下内容的 xml 字段的表格：

<ContentBlock xmlns="http://corp.com/wdpr/ContentBlock">
<key xlink:href="tcm:0-133036" xlink:title="entityCard" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
<template xlink:href="tcm:0-132970" xlink:title="card-header-read-more-all-media" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
<section>
    <name xlink:href="tcm:0-132988" xlink:title="header" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <content>
        <p xmlns="http://www.w3.org/1999/xhtml">Make a Friend</p>
    </content>
</section>
<section>
    <name xlink:href="tcm:0-133110" xlink:title="readMore" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <content>
        <p xmlns="http://www.w3.org/1999/xhtml">Meet and greet friendly animals at the only petting zoo in Disney’s Animal
        Kingdom park.
     </p>
    </content>
</section>
<section>
    <name xlink:href="tcm:0-132939" xlink:title="readAll" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <content>
        <p xmlns="http://www.w3.org/1999/xhtml">Meet and greet friendly animals.
     </p>
        <p xmlns="http://www.w3.org/1999/xhtml">Pet, brush and feed domesticated creatures
     </p>
        <ul xmlns="http://www.w3.org/1999/xhtml">
            <li xmlns="http://www.w3.org/1999/xhtml">Goats</li>
        </ul>
        <p xmlns="http://www.w3.org/1999/xhtml">Handy animal brushes are available .
     </p>
        <p xmlns="http://www.w3.org/1999/xhtml">
            <strong xmlns="http://www.w3.org/1999/xhtml">Keeping Clean</strong>
            <br xmlns="http://www.w3.org/1999/xhtml"/>Guests are encouraged to cleanse.</p>
    </content>
</section>
<media>
    <name xlink:href="tcm:0-201994" xlink:title="media" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <key xlink:href="tcm:0-132952" xlink:title="170 x 96" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <image xlink:href="tcm:0-231377" xlink:title="section-01.jpg" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
</media>
</ContentBlock>

我的目标是进行查询，我可以在其中找到（例如）包含文本“结交朋友”的 <p>，然后在同一 <section> 中获取 <name> 元素的 xlink:href标记。

我尝试了以下帖子中的一些选项：here 和 here，但我没有得到我需要的结果。

这行不通

SELECT  a.value1,
    x.XmlCol.value('(section/content/p)[1]','VARCHAR(100)') AS SendMethod
FROM    @test a
CROSS APPLY a.AppConfig.nodes('/ContentBlock') x(XmlCol)
WHERE x.XmlCol.exist('section/content/p[contains(.,"Make a Friend")]') = 1

我怎样才能得到它？

提前致谢。吉列尔莫。

Answer 1

试试这样：

DECLARE @mockup TABLE(ID INT IDENTITY,YourXML XML);
INSERT INTO @mockup VALUES
('<ContentBlock xmlns="http://corp.com/wdpr/ContentBlock">
  <key xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tcm:0-133036" xlink:title="entityCard" xlink:type="simple" />
  <template xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tcm:0-132970" xlink:title="card-header-read-more-all-media" xlink:type="simple" />
  <section>
    <name xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tcm:0-132988" xlink:title="header" xlink:type="simple" />
    <content>
      <p xmlns="http://www.w3.org/1999/xhtml">Make a Friend</p>
    </content>
  </section>
  <section>
    <name xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tcm:0-133110" xlink:title="readMore" xlink:type="simple" />
    <content>
      <p xmlns="http://www.w3.org/1999/xhtml">Meet and greet friendly animals at the only petting zoo in Disney’s Animal
        Kingdom park.
     </p>
    </content>
  </section>
  <section>
    <name xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tcm:0-132939" xlink:title="readAll" xlink:type="simple" />
    <content>
      <p xmlns="http://www.w3.org/1999/xhtml">Meet and greet friendly animals.
     </p>
      <p xmlns="http://www.w3.org/1999/xhtml">Pet, brush and feed domesticated creatures
     </p>
      <ul xmlns="http://www.w3.org/1999/xhtml">
        <li xmlns="http://www.w3.org/1999/xhtml">Goats</li>
      </ul>
      <p xmlns="http://www.w3.org/1999/xhtml">Handy animal brushes are available .
     </p>
      <p xmlns="http://www.w3.org/1999/xhtml">
        <strong xmlns="http://www.w3.org/1999/xhtml">Keeping Clean</strong>
        <br xmlns="http://www.w3.org/1999/xhtml" />Guests are encouraged to cleanse.</p>
    </content>
  </section>
  <media>
    <name xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tcm:0-201994" xlink:title="media" xlink:type="simple" />
    <key xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tcm:0-132952" xlink:title="170 x 96" xlink:type="simple" />
    <image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tcm:0-231377" xlink:title="section-01.jpg" xlink:type="simple" />
  </media>
</ContentBlock>');

-首先我声明一个变量来使搜索字符串动态：

DECLARE @SearchFor VARCHAR(100)='Make a Friend';

--您的 XML 在最外层元素中有一个默认命名空间。
--让事情有点奇怪：元素<p>上还有另一个默认命名空间
--我们可以用说话的前缀来声明它

WITH XMLNAMESPACES(DEFAULT 'http://corp.com/wdpr/ContentBlock'
                          ,'http://www.w3.org/1999/xlink' AS xlink
                          ,'http://www.w3.org/1999/xhtml' AS InnerDflt )
SELECT YourXML.value('(/ContentBlock/section[(content/InnerDflt:p/text())[1]=sql:variable("@SearchFor")]/name/@xlink:href)[1]','nvarchar(max)') 
FROM @mockup

查询运行如下：

以<ContentBlock> 开头。查找<section>，其中<p> 下方<content> 的text() 是搜索字符串。重要提示：现阶段我们仍处于<section> 的级别。所以我们可以继续XPath 和<name> 并在那里找到属性。

Answer 2

Shnugo 抢了我的风头，但我仍在发布我整理的内容，因为它也可以工作并演示一些技巧（例如，*:，当你懒得添加正确的命名空间语法时）;)。我将提到使用 sql:variable 将 SQL 变量传递到 XPath 表达式中 - shnugo 的帖子演示了如何做到这一点（我发布的内容中缺少它）。

-- bonus sample data
DECLARE @xml XML = 
'<ContentBlock xmlns="http://corp.com/wdpr/ContentBlock">
<key xlink:href="tcm:0-133036" xlink:title="entityCard" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
<template xlink:href="tcm:0-132970" xlink:title="card-header-read-more-all-media" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
<section>
    <name xlink:href="tcm:0-132988" xlink:title="header" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <content>
        <p xmlns="http://www.w3.org/1999/xhtml">Make a Friend</p>
    </content>
</section>
<section>
    <name xlink:href="tcm:0-133110" xlink:title="readMore" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <content>
        <p xmlns="http://www.w3.org/1999/xhtml">Meet and greet friendly animals at the only petting zoo in Disney’s Animal
        Kingdom park.
     </p>
    </content>
</section>
<section>
    <name xlink:href="tcm:0-132939" xlink:title="readAll" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <content>
        <p xmlns="http://www.w3.org/1999/xhtml">Meet and greet friendly animals.</p>
        <p xmlns="http://www.w3.org/1999/xhtml">Pet, brush and feed domesticated creatures
     </p>
        <ul xmlns="http://www.w3.org/1999/xhtml">
            <li xmlns="http://www.w3.org/1999/xhtml">Goats</li>
        </ul>
        <p xmlns="http://www.w3.org/1999/xhtml">Handy animal brushes are available .
     </p>
        <p xmlns="http://www.w3.org/1999/xhtml">
            <strong xmlns="http://www.w3.org/1999/xhtml">Keeping Clean</strong>
            <br xmlns="http://www.w3.org/1999/xhtml"/>Guests are encouraged to cleanse.</p>
    </content>
</section>
<media>
    <name xlink:href="tcm:0-201994" xlink:title="media" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <key xlink:href="tcm:0-132952" xlink:title="170 x 96" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
    <image xlink:href="tcm:0-231377" xlink:title="section-01.jpg" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink"/>
</media>
</ContentBlock>';

DECLARE @test TABLE (someId INT IDENTITY, AppConfig XML);
INSERT @test (AppConfig) VALUES (@xml),(CAST(REPLACE(REPLACE(CAST(@xml AS VARCHAR(8000)),
  'Make a Friend','xxx'),'Keeping Clean','Make a Friend') AS XML));

-- SOLUTION
WITH XMLNAMESPACES ('http://www.w3.org/1999/xlink' AS xlink)
SELECT t.someId, href = cb.x.value('(../*:name/@xlink:href)[1]', 'varchar(8000)')
FROM @test AS t
CROSS APPLY t.AppConfig.nodes('*:ContentBlock/*:section/*:content') AS cb(x)
WHERE cb.x.exist('*:p[contains(.,"Make a Friend")]') = 1;

返回：

someId      href
----------- -------------
1           tcm:0-132988
2           tcm:0-132939