XML sql查询，属性作为列

Question

I need to query xml data available in server

<root>
  <Parameter>
     <Param>APP_REG_NUMBER</Param>
     <Value>AL/T/2010/86</Value>
  </Parameter>
  <Parameter>
      <Param>SUBLINEID</Param>
      <Value>235931</Value>
  </Parameter>
</root>

This is the structure I am saving data into SQL Server, I need output as follows:

Filed1     , Filed2   , APP_REG_NUMBER,  SUBLINEID
something   something , AL/T/2010/86, 235931

please do the needful

Answer 1

You can use XQuery for this, but realize you are recreating key-value-pairs in XML, which negates the ability to use schemas or XQuery/XPATH in any reasonable manner. Consider changing the format to:

<root>
    <APP_REG_NUMBER>AL/T/2010/86</APP_REG_NUMBER>
    <SUBLINEID>235931</SUBLINEID>
</root>

I digress... the query you want is:

DECLARE @testXml xml = N'<root>
  <Parameter><Param>APP_REG_NUMBER</Param><Value>AL/T/2010/86</Value></Parameter>
  <Parameter><Param>SUBLINEID</Param><Value>235931</Value></Parameter>
</root>'

SELECT 
    @testXml.value('(//Parameter[Param/text()="APP_REG_NUMBER"]/Value)[1]', 'nvarchar(50)') as APP_REG_NUMBER,
    @testXml.value('(//Parameter[Param/text()="SUBLINEID"]/Value)[1]', 'nvarchar(50)') as SUBLINEID

You use the //Parameter syntax to find all Parameter elements and then filter them ( [Param/text()="foobar"] ) to only those which have a child named Value that have the inner text of SUBLINEID . From there, you navigate to the /Value child element and return the first result ( (query)[1] ).