从 XML 中选择所有匹配的字符串值答案

【问题标题】：Selecting all the string values that match, from XML从 XML 中选择所有匹配的字符串值
【发布时间】：2019-09-12 23:09:32
【问题描述】：

我需要从 XML 列中检索所有以“+”结尾的句子。我当前的查询仅检索第一句话。

以下是 XML 内容：

<file>
  <row>Addendum and/or contract providing additional event details and conditions. +</row>
  <row />
  <row>Special duty officer(s) required for event. There are charges for these services.+</row>
  <row />
  <row>Notify Mall Crew of electrical needs for activities.+</row>
  <row />
  <row>8’ pedestrian pathway must be maintained on sidewalks throughout event area.~</row>
  <row />
  <row>Provide and maintain access to the Hotel during event.~</row>
  <row />
  <row>Event organizer/sponsor is responsible for cleanup of event area.|</row>
  <row />  
</file>

您可以看到有三行以“+”结尾的句子。我运行这个查询：

SELECT b.value('(./row/text())[1]','nvarchar(max)') as [row]
FROM @xmlstr.nodes('/file') AS a(b)
WHERE right(b.value('(./row/text())[1]','nvarchar(max)'), 1) = '+'

但我只得到第一句话，我需要所有最后带有加号的句子。

如果有人能帮我解决这个问题，我将非常感激

提前谢谢你。

【问题讨论】：

标签： sql xml tsql parsing sql-server-2012

【解决方案1】：

John 的解决方案很棒，只是为了提供替代方案，您可以致电 XQuery 来检查最后一个字符，如下所示：

DECLARE @xml XML=N'<file>
  <row>Addendum and/or contract providing additional event details and conditions. +</row>
  <row />
  <row>Special duty officer(s) required for event. There are charges for these services.+</row>
  <row />
  <row>Notify Mall Crew of electrical needs for activities.+</row>
  <row />
  <row>8’ pedestrian pathway must be maintained on sidewalks throughout event area.~</row>
  <row />
  <row>Provide and maintain access to the Hotel during event.~</row>
  <row />
  <row>Event organizer/sponsor is responsible for cleanup of event area.|</row>
  <row />  
</file>';

SELECT r.value('text()[1]','nvarchar(1000)')
FROM @xml.nodes('/file/row[substring(text()[1],string-length(text()[1]),1)="+"]') A(r);

结果

Addendum and/or contract providing additional event details and conditions. +
Special duty officer(s) required for event. There are charges for these services.+
Notify Mall Crew of electrical needs for activities.+

【讨论】：

哇！ xquery 方法有 15% 的执行计划批处理，而我的 85%。我又一次学到了一些新东西。 +1
@JohnCappelletti 真的有那么多吗？没想到会这样......你的可能会用text()[1]而不是.和/file/row而不是file/*来改进。此外，我希望RIGHT(REVERSE(),1) 比LIKE '%+' 更快...或SUBSTRING 以获取XQuery 中的最后一个字符...但是，感谢您的支持:-)
/file/row 没有变化，但我确实通过 right(...,1) 获得了四个完整的百分点 :)

【解决方案2】：

大概是这样的

SELECT b.value('.','nvarchar(max)') as [row]
 FROM  @xmlstr.nodes('file/*') AS a(b)
WHERE  b.value('.','nvarchar(max)') like '%+'

退货

row
Addendum and/or contract providing additional event details and conditions. +
Special duty officer(s) required for event. There are charges for these services.+
Notify Mall Crew of electrical needs for activities.+

【讨论】：