使用名称空间的T-Sql xml查询。

This is a follow up question to

这是一个后续问题

t - sql xml查询

If I add a namespace to xml data, nothing is returned again.

如果我向xml数据添加一个名称空间，则不会再次返回任何内容。

DECLARE @xVar XML
SET @xVar = 
  '<ReportData ObjectId="123" xmlns="http://ait.com/reportdata">
  <ReportId>AAAA-BBBB-CCCCC-DDDDD</ReportId>
  <DocId>100</DocId>
  <ReportName>Drag Scraper Troubleshooting</ReportName>
  <DocType>Name</DocType>
  <StatusId>1</StatusId>
  <AuthorId>1</AuthorId>
   </ReportData>'

SELECT [ReportId]= reportdata.item.value('.', 'varchar(40)') 
FROM   @xVar.nodes('/ReportData/ReportId[1]') AS reportdata(item)

The above query returns nothing. Secondly, how would I select all elements in a single select and return a row with all elements as fields?

上面的查询不返回任何内容。其次，如何在单个选择中选择所有元素，并返回以所有元素为字段的行?

I want to return a record constructed as the following:

我想返回如下所构建的记录:

ReportId              | DocId | ReportName | 
AAAA-BBBB-CCCCC-DDDDD | 100   | AAAA-BBBB-CCCCC-DDDDD |

2 个解决方案

#1

Look at WITH XMLNAMESPACES

看与XMLNAMESPACES

;WITH XMLNAMESPACES(DEFAULT 'http://ait.com/reportdata')
SELECT [ReportId]= reportdata.item.value('.', 'varchar(40)') 
FROM   @xVar.nodes('/ReportData/ReportId[1]') AS reportdata(item)

#2

If my assumptions are correct and you want to list ALL ReportData elements in your XML document and want their child elements as different columns, you could look at something like this:

如果我的假设是正确的，并且您希望列出XML文档中的所有ReportData元素，并希望它们的子元素作为不同的列，您可以查看以下内容:

;WITH XMLNAMESPACES(DEFAULT 'http://ait.com/reportdata')
SELECT 
    [ReportId] = reportdata.item.value('(./ReportId)[1]', 'varchar(40)') 
  , [DocId] = reportdata.item.value('(./DocId)[1]', 'varchar(40)') 
  , [ReportName] = reportdata.item.value('(./ReportName)[1]', 'varchar(40)') 
  , [DocType] = reportdata.item.value('(./DocType)[1]', 'varchar(40)') 
  , [StatusId] = reportdata.item.value('(./StatusId)[1]', 'varchar(40)') 
  , [AuthorId] = reportdata.item.value('(./AuthorId)[1]', 'varchar(40)') 
FROM @xVar.nodes('//ReportData') AS reportdata(item)

I'll need to look at cleaning up the namespace declarations a bit, but it seems to work for me...

我需要稍微清理一下名称空间声明，但它似乎对我有用……

EDIT: Amended my answer with the WITH XMLNAMESPACES clause as recommended by Martin. :)

编辑:根据Martin推荐的xmlnamespace子句修改了我的答案。:)

#1