从SQL Server 2012中的XML列中提取值

Question

I have seen many questions addressing this issue, but unfortunately I still was not able to make it work.

Here's an example of the XML data contained in an XML column called RentalValueAmount in a table called Units :

<X C="1" I="0">
  <E D="1000Y0M0W0D" P="1" A="36500" />
</X>

I tried this but did not get any values:

select 
    cast(RentalValueAmount as XML).value('data(/X/E)[1]','varchar(10)') as test
from dbo.units

I need to extract or return 36500 as a number using a query but I have not been able to do so. Obviously I do not know XML, so I would really appreciate the help.

Answer 1

Try this:

select 
cast(RentalValueAmount as XML).value('(/X/E)[1]/@A','varchar(10)') as test
from dbo.units

If the column is already of XML data type, you don't need to cast it to XML again.