Question

我有一个像这样的XML文档：

helper.updateData(id,question,ans1,ans2,ans3,ans4,sqLiteDatabase);

我的输出结果如下：

DROP TABLE #temp
create table #temp (xml_data xml)

insert into #temp (xml_data) values
('<UPDATE><ENTITY DN="test"><ATTRIBUTE N="test name" V="test value" />     </ENTITY></UPDATE>')

select C.value('@DN', 'varchar(max)') as [ENTITY.DN]
      ,C.value('@N', 'varchar(max)') as [ATTRIBUTE.N]
      ,C.value('@V', 'varchar(max)') as [ATTRIBUTE.V]
from #temp cross apply
     #temp.xml_data.nodes('UPDATE/ENTITY') as X(C)

我想看看：

test | NULL | NULL

有关我如何错误配置的任何想法？

Answer 1

如果一个ENTITY可能在您的评论中有多个ATTRIBUTE子项，那么您需要另一个APPLY粉碎ATTRIBUTE，例如：

declare @temp table(xml_data xml)
insert into @temp (xml_data) values
('<UPDATE>
  <ENTITY DN="test">
    <ATTRIBUTE N="test name" V="test value"/> 
    <ATTRIBUTE N="foo1" V="bar1"/>
    <ATTRIBUTE N="foo2" V="bar2"/>
  </ENTITY>
</UPDATE>')

select ent.value('@DN', 'varchar(max)') as [ENTITY.DN]
      ,attr.value('@N', 'varchar(max)') as [ATTRIBUTE.N]
      ,attr.value('@V', 'varchar(max)') as [ATTRIBUTE.V]
from @temp t 
     cross apply t.xml_data.nodes('UPDATE/ENTITY') as X(ent)
     cross apply ent.nodes('./ATTRIBUTE') as Y(attr)

<强> SQLFiddle Demo

输出

| ENTITY.DN | ATTRIBUTE.N | ATTRIBUTE.V |
|-----------|-------------|-------------|
|      test |   test name |  test value |
|      test |        foo1 |        bar1 |
|      test |        foo2 |        bar2 |

Answer 2

更改为

DROP TABLE #temp
create table #temp (xml_data xml)

insert into #temp (xml_data) values
('<UPDATE><ENTITY DN="test"><ATTRIBUTE N="test name" V="test value" />     </ENTITY></UPDATE>')

select C.value('@DN', 'varchar(max)') as [ENTITY.DN]
      ,C.value('ATTRIBUTE[1]/@N', 'varchar(max)') as [ATTRIBUTE.N]
      ,C.value('ATTRIBUTE[1]/@V', 'varchar(max)') as [ATTRIBUTE.V]
from #temp cross apply
     #temp.xml_data.nodes('UPDATE/ENTITY') as X(C)

Answer 3

DimaSUN提供的答案将有效。这是另一种查询：

SELECT xml_data.query('data(/UPDATE/ENTITY/@DN)') as [ENTITY.DN],
        xml_data.query('data(/UPDATE/ENTITY/ATTRIBUTE/@N)') as [ATTRIBUTE.N],
        xml_data.query('data(/UPDATE/ENTITY/ATTRIBUTE/@V)') as [ATTRIBUTE.V]
    FROM #temp;

访问SQL Server的多个XML文档节点

3 个答案: