Question

我正在尝试读取xml并将其存储在SQL server中。

DECLARE @xml XML
SET @xml = 
 '<report>
    <personal>
       <search>
           <subject>
               <name>SearchName</name>
           </subject>
       </search>    
    </personal>
    <personal>
       <search>
           <subject>
               <name>SearchName</name>
           </subject>
       </search>
       <result>
           <history>
              <name>HistoryName</name>
           </history>
       </result>
    </personal>
  </report>
'

我在这里尝试的是 - 选择名称，但这里的条件是如果<personal>包含<result>，请选择name下的history/name

如果<personal>不包含<result>，请选择name下的subject/name

目前我正在从个人/主题中选择姓名，如下所示：

Select 
A.Search.value('(subject/name)[1]','varchar(max)')
FROM  @xml.nodes('/report/personal/search') as A(Search)

期待结果：

SearchName
HistoryName

如何在两者之间添加条件？

我们有什么方法可以在这里添加存在条件

 SELECT @xml.exist('//report//personal//search//subject//name')

Answer 1

Select coalesce(A.Search.value('(result/history/name)[1]', 'varchar(max)'), A.Search.value('(search/subject/name)[1]','varchar(max)'))
FROM @xml.nodes('/report/personal') as A(Search)

Answer 2

此：

SELECT 
    COALESCE(
       A.Search.value('(result/history/name)[1]','varchar(max)'),
       A.Search.value('(search/subject/name)[1]','varchar(max)')
    ) AS Name
FROM @xml.nodes('/report/personal') as A(Search)

将返回：

Name
------------
SearchName
HistoryName

如果条件在SQL中选择XML节点

2 个答案: