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 table，其中 xml 字段的内容如下：

<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>

我的目标是有一个查询，我可以在其中找到（例如）包含文本 "Make a Friend" 的 <p>，然后获取 [=15= 的 xlink:href ] 元素在同一个 <section> 标签中。

我尝试了以下帖子中的几个选项：here and 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

如何获取？

提前致谢。吉列尔莫.

Answer 1

这样试试：

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使搜索字符串动态化：

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

--您的 XML 在最外层元素中有一个默认名称空间。
-- 是什么让事情变得有点奇怪：元素 <p>
上还有另一个默认命名空间 --我们可以用口语前缀声明这个

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：

从 <ContentBlock> 开始。查找 <section>，其中 <content> 下面 <p> 的 text() 是搜索字符串。重要提示：现阶段我们还处于 <section> 的水平。所以我们可以用 <name> 继续 XPath 并在那里找到属性。

Answer 2

Shnugo 抢了我的风头，但我仍在 post 整理我放在一起的东西，因为它也能正常工作并演示了一些技巧（例如 *: 当你懒得添加正确的命名空间语法）；）。我打算提到使用 sql:variable 将 SQL 变量传递到您的 XPath 表达式中 - shnugo 的 post 演示了如何做到这一点（它在我 posting).

-- 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;

Returns:

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

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

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