使用 SQL Server 从名称相同的 XML 节点获取所有数据 [英] Use SQL Server to get all the data from XML nodes named the same

问题描述

我有一个 XML 文件，我需要从中获取数据的节点的名称都相同.我了解如何访问第一条(或第二条记录)，因此以下查询仅提供第二位作者( 标记).如何将所有作者作为一个列?

I have an XML file where the nodes that I need the data from are all named the same. I understand how to access the first (or second record) so the following query only gives me the second author (the <a1> tag). How do I get all the authors as a single column ?

      DECLARE @MyXML XML
      SET @MyXML = '<refworks>
            <reference>
               <rt>Journal Article</rt> 
               <sr>Print(0)</sr> 
               <id>869</id> 
               <a1>Aabye,Martine G.</a1> 
               <a1>Hermansen,Thomas Stig</a1> 
               <a1>Ruhwald,Morten</a1> 
               <a1>PrayGod,George</a1> 
               <a1>Faurholt-Jepsen,Daniel</a1> 
               <a1>Jeremiah,Kidola</a1> 
               <a1>Faurholt-Jepsen,Maria</a1> 
               <a1>Range,Nyagosya</a1> 
           </reference>
         </refworks>'

      SELECT 
          author.value('(a1)[2]', 'varchar(MAX)') AS 'Author'
      FROM @MyXML.nodes('/refworks/reference') AS ref(author)

推荐答案

试试这个 :-

  SELECT 
      author.value('./text()[1]', 'varchar(MAX)') AS 'Author'
  FROM @MyXML.nodes('//refworks/reference/child::node()') AS ref(author)
  where  author.value('local-name(.)[1]', 'varchar(100)') ='a1'

child::node() 表示轴说明符，它是 child，:: 是轴分隔符.

child::node() represents an axis specifier which is child and :: is the axis separator.

要了解用于在节点中向下钻取的子轴，可以在此MSDN 文档.

For understanding child axis which is used to drill down in the node can be found in this MSDN document.

或 在sql server

更新:-

一个更简单的方法你在正确的轨道上.在 from 子句中指定子节点来过滤数据

A much simplier way You were on the right track .Specify the child node in the from clause for filtering the data

 SELECT 
      author.value('(.)[1]', 'varchar(MAX)') AS 'Author'
  FROM @MyXML.nodes('/refworks/reference/a1') AS ref(author)

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