Query XML value in sql - sql-server

Question

I need to get some information from XML in SQL Server 2008, but I cannot even get basic attribute from it. All samples that I tried failed. Table name is Item, xml column name is Data.
Simplified xml looks like this:
<AnchoredXml xmlns="urn:schema:Microsoft.Rtc.Management.ScopeFramework.2008" SchemaWriteVersion="2">
<Key ScopeClass="Global">
<SchemaId Namespace="urn:schema:Microsoft.Rtc.Management.Deploy.Topology.2008" ElementName="Topology" />
<AuthorityId Class="Host" InstanceId="00000000-0000-0000-0000-000000000000" />
</Key>
<Dictionary Count="1">
<Item>
<Key />
<Value Signature="a3502dd0-8c16-4023-9eea-30ea1c7a3a2b">
<Topology xmlns="urn:schema:Microsoft.Rtc.Management.Deploy.Topology.2008">
<Services>
<Service RoleVersion="1" ServiceVersion="6" Type="Microsoft.Rtc.Management.Deploy.Internal.ServiceRoles.FileStoreService">
<ServiceId SiteId="1" RoleName="FileStore" Instance="1" />
<DependsOn />
<InstalledOn>
<ClusterId SiteId="1" Number="1" />
</InstalledOn>
<Ports xmlns="urn:schema:Microsoft.Rtc.Management.Deploy.ServiceRoles.2008" />
<FileStoreService xmlns="urn:schema:Microsoft.Rtc.Management.Deploy.ServiceRoles.2008" ShareName="lyncShare" />
</Service>
</Services>
</Topology>
</Value>
</Item>
</Dictionary>
</AnchoredXml>
I need to read information in AnchoredXml/Key/SchemaId/#NameSpace to select the right xml (there are more rows). Sample xml above is the right one. And after that I need to find the right service with
Type="Microsoft.Rtc.Management.Deploy.Internal.ServiceRoles.FileStoreService"
where is FileStoreService/#ShareName that I need.
I've tried to print the Namespace attributte for the start, but no sample code is working.
A few tries:
SELECT c.p.value('(#Namespace)[1]', 'varchar(50)') as 'Nmspace'
FROM Item
CROSS APPLY Data.nodes('/AnchoredXml/Key/SchemaId') c(p)
returns empty result set
SELECT Data.value('(/AnchoredXml/Key/SchemaId/#Namespace)[1]', 'varchar(50)')
FROM Item
returns NULL for all rows
SELECT
It.Data.exist('/AnchoredXml/Key/SchemaId[#Namespace="Microsoft.Rtc.Management.Deploy.Topology.2008"]')
FROM [xds].[dbo].[Item] AS It
returns 0's for all rows also without quotes ("")
A working sample code to get at least attribute test would be maybe sufficient and I would figure out the rest.
Could you please help me find errors in my queries or maybe identify some other problem?
Thanks

Answer 1

You're ignoring all the XML namespaces in your XML document! You need to pay attention to those and respect them!
There are XML namespaces on:
the root node <AnchoredXml>
(XML namespace: urn:schema:Microsoft.Rtc.Management.ScopeFramework.2008)
the subnode <Topology>
(XML ns: urn:schema:Microsoft.Rtc.Management.Deploy.Topology.2008)
the subnode <FileStoreService>
(XML ns: urn:schema:Microsoft.Rtc.Management.Deploy.ServiceRoles.2008)
Try this:
-- respect the XML namespaces!!
;WITH XMLNAMESPACES(DEFAULT 'urn:schema:Microsoft.Rtc.Management.ScopeFramework.2008',
'urn:schema:Microsoft.Rtc.Management.Deploy.Topology.2008' AS t,
'urn:schema:Microsoft.Rtc.Management.Deploy.ServiceRoles.2008' AS fss)
SELECT
ShareName = Data.value('(/AnchoredXml/Dictionary/Item/Value/t:Topology/t:Services/t:Service/fss:FileStoreService/#ShareName)[1]', 'varchar(50)')
FROM
dbo.Item
In my case, this returns:
ShareName
-----------
lyncShare