如何在SQL Server中读取此XML

Question

I am having xml as result for webservice api . i need to parse the result and update to database table. my xml is below . it is a response text.

<?xml version="1.0" encoding="utf-8"?> 
<double>1</double>

Sqlserver 2008 Code :

    declare @xml xml, @rate DECIMAL(10,4)
  set @xml=REPLACE(@ResponseText ,'encoding="utf-8"','')
  select @rate= @xml.value('(/double)[1]','decimal')

I want to get the value of double but it always return the null .

Please help me out .

Hi , have Done changes as per your suggestion still no getting.

 declare @xml XML
 DECLARE @responsetext VARCHAR(900)

 declare @rate DECIMAL(10,4)
 SET @responsetext = '<?xml version="1.0" encoding="utf-8"?>
  <double xmlns="http://www.webserviceX.NET/">1</double>'
 set @xml=REPLACE(@ResponseText ,'encoding="utf-8"','')
 select @rate= @xml.value('(/double)[1]','decimal')
 select @rate

Answer 1

You need to declare the namespace when querying using the value() Method.

Change the first parameter of value() from

'(/double)[1]'

to

'declare namespace x="http://www.webserviceX.NET/"; (/x:double)[1]'

So the full example will look like this

declare @xml XML
 DECLARE @responsetext VARCHAR(900)

 declare @rate DECIMAL(10,4)
 SET @responsetext = '<?xml version="1.0" encoding="utf-8"?>
  <double xmlns="http://www.webserviceX.NET/">1</double>'
 set @xml=REPLACE(@ResponseText ,'encoding="utf-8"','')
 select @rate= @xml.value('declare namespace x="http://www.webserviceX.NET/"; (/x:double)[1]','decimal')
 select @rate

which should return 1.000 (decimal)

Answer 2

DECLARE @X XML = '<?xml version="1.0" encoding="utf-8"?> 
<double xmlns="http://www.webserviceX.NET/">1</double>'

SELECT @X.value ('declare namespace x="http://www.webserviceX.NET/"; (/x:double)[1]', 'decimal')

Updated to reflect your use of namespace; the general point is that you don't need to do string manipulation to make this work. The header is fully supported. However, namespaces are important.

Answer 3

Not an answer, just some sample code - this returns a 1, not a NULL:

declare @xml xml,        @rate DECIMAL(10,4)
declare @ResponseText varchar(900)

set @ResponseText = '<?xml version="1.0" encoding="utf-8"?> <double>1</double>'

set @xml=REPLACE(@ResponseText ,'encoding="utf-8"','')
select @rate= @xml.value('(/double)[1]','decimal')
select @rate