Parsing XML with XMLNS in SQL Server 2008 R2 - sql-server

Question

I'm fairly new to querying XML datatypes. We receive XMLs from partners and one such partner sends us XMLs like this:
DECLARE #ResultData XML = '<outGoing xmlns="urn:testsystems-com:HH.2015.Services.Telephony.OutGoing">
<customer>
<ID>158</ID>
</customer>
</outGoing>'
In this example, I would like to pull only the ID out of the XML, but it seems the xmlns is preventing me from getting anything inside the XML:
SELECT cust.value('(ID)[1]', 'VARCHAR(40)') as 'CustomerID'
FROM #ResultData.nodes('/outGoing/customer') as t(cust)
returns NUll, but if I manually remove the XMLNS from the XML I get 158.
I've experimented with WITH XMLNAMESPACES to see if I could use that, but I'm obviously missing something. Since these XMLs will be coming in automatically, I would like to be able to parse the XML, but right now I'm stuck.

Answer 1

That should work:
DECLARE #ResultData XML = '<outGoing xmlns="urn:testsystems-com:HH.2015.Services.Telephony.OutGoing">
<customer>
<ID>158</ID>
</customer>
</outGoing>'
;WITH XMLNAMESPACES(DEFAULT 'urn:testsystems-com:HH.2015.Services.Telephony.OutGoing')
SELECT
#ResultData.value('(/outGoing/customer/ID)[1]', 'int')
or to use your approach:
;WITH XMLNAMESPACES(DEFAULT 'urn:testsystems-com:HH.2015.Services.Telephony.OutGoing')
SELECT
CustomerID = cust.value('(ID)[1]', 'INT')
FROM
#ResultData.nodes('/outGoing/customer') as t(cust)
This will return 158 as its value.
I've used WITH XMLNAMESPACES(DEFAULT .....) since this is the only XML namespace in play, and it's defined at the top-level node - so it applies to every node in the XML structure.