Question

三个看似相同的XML nodes（）查询，但第一个查询列的第一行返回不同的结果：Location1，Location2，Location3
为什么不同？
提前谢谢。

declare @xml xml
set @xml =
'<root>
  <Location1 LocationID="10">
     <step1>apple</step1>
     <step2>banana</step2>
  </Location1>
  <Location2 LocationID="20">
     <step1>carrot</step1>
     <step2>donut</step2>
  </Location2>
  <Location3 LocationID="30">
     <step1>egg</step1>
     <step2>fry</step2>
  </Location3>
</root>'

declare @SQL nvarchar(max) = ''
declare @Col nvarchar(max) = ', N.value(''[COLNAME][1]'', ''varchar(100)'') as [COLNAME]' 
select @SQL = @SQL + replace(@Col, '[COLNAME]', N.value('local-name(.)', 'sysname'))
from @XML.nodes('//*') as T(N)
set @SQL = 'select '+stuff(@SQL, 1, 2, '')+' from @XML.nodes(''//*'') as T(N)' 
exec sp_executesql @SQL, N'@XML xml', @XML

declare @sql2 nvarchar(max) = ''
set @sql2 =
'select
n.value(''root[1]'',''varchar(100)'') as root,
n.value(''location1[1]'',''varchar(100)'') as location1,
n.value(''step1[1]'',''varchar(100)'') as step1,
n.value(''step2[1]'',''varchar(100)'') as step2,
n.value(''location2[1]'',''varchar(100)'') as location2,
n.value(''step1[1]'',''varchar(100)'') as step1,
n.value(''step2[1]'',''varchar(100)'') as step2,
n.value(''location3[1]'',''varchar(100)'') as location3,
n.value(''step1[1]'',''varchar(100)'') as step1,
n.value(''step2[1]'',''varchar(100)'') as step2
from @xml.nodes(''//*'') as t(n)'
exec sp_executesql @SQL2, N'@XML xml', @XML

select
n.value('root[1]','varchar(100)') as root,
n.value('location1[1]','varchar(100)') as location1,
n.value('step1[1]','varchar(100)') as step1,
n.value('step2[1]','varchar(100)') as step2,
n.value('location2[1]','varchar(100)') as location2,
n.value('step1[1]','varchar(100)') as step1,
n.value('step2[1]','varchar(100)') as step2,
n.value('location3[1]','varchar(100)') as location3,
n.value('step1[1]','varchar(100)') as step1,
n.value('step2[1]','varchar(100)') as step2
from @xml.nodes('//*') as t(n)

PS：好的。它不会让我发布这个没有写更多，所以：最终，我试图让SQL将XML文件解析成一个表，其中节点，元素和属性作为列标题，其各自的值或子节点列在它们下面。像这样的东西（我无法上传图像，希望格式化仍然存在）：

root      Location1      LocationID      Step1      Step2      Location2      Location3
Location1 LocationID     10
          Step1                          apple
          Step2                                     banana
Location2                20                                    LocationID
                                         carrot                Step1
                                                    donut      Step2
Location3                30                                                   LocationID
                                         egg                                  Step1
                                                    fry                       Step2

出于某种原因，这是一个很高的SQL订单，但我仍然对上述查询中的差异感到好奇。

Answer 1

原因是xml元素名称区分大小写。在第一个查询中，您有Location1，Location2，Location3，第二个location1，location2，location3

SQL：XML nodes（）：相同的查询：不同的结果

1 个答案: