Create where condition from XML value with multiple namespaces - sql-server

Question

I'm looking to return value for my where condition from an XML.
I'd like to return a value from messages table's Request column. Which is in XML data format. Unfortunately all I could achieve is retrieving nothing.
Then I tried to put the value as a column but I always get nulls for the values
Here's an XML from Request column:
<InvoiceRequest xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/InternalReuqests">
<ActiveUserID xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase">0</ActiveUserID>
<LinqConfigId xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase">0</LinqConfigId>
<RequestHeaderInfo xmlns:d2p1="Fix.Services" xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase">
<d2p1:MapArchive i:nil="true" />
<d2p1:HandledSuccessCategory>rscNone</d2p1:HandledSuccessCategory>
</RequestHeaderInfo>
<Username xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase" i:nil="true" />
<SSID>S-1-6-25-123456789-123456789-123456789-12345</SSID>
<miscdata xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
<d2p1:string>date:2020.02.26 08:27:00</d2p1:string>
<d2p1:string>hours:0</d2p1:string>
<d2p1:string>Ready:True</d2p1:string>
<d2p1:string>disct:False</d2p1:string>
<d2p1:string>extdisct:False</d2p1:string>
<d2p1:string>Matmove:False</d2p1:string>
<d2p1:string>Matlim:0</d2p1:string>
<d2p1:string>Comments:</d2p1:string>
</miscdata>
<ffreeID>468545</ffreeID>
</InvoiceRequest>
here's my sql query:
select id, Request.value('(/*:InvoiceRequest/*:ffreeID)[1]','varchar(max)')
from messages
I thought I should get in the first column the id from the database, and next to it the value of the ffreeID, but the Request.value is always null.
Could anyone look into it what am I missing?

Answer 1

You need for declare the default namespace, which for your xml is http://schemas.datacontract.org/2004/07/InternalReuqests:
--Sample XML
DECLARE #xml xml = '<InvoiceRequest xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/InternalReuqests">
<ActiveUserID xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase">0</ActiveUserID>
<LinqConfigId xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase">0</LinqConfigId>
<RequestHeaderInfo xmlns:d2p1="Fix.Services" xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase">
<d2p1:MapArchive i:nil="true" />
<d2p1:HandledSuccessCategory>rscNone</d2p1:HandledSuccessCategory>
</RequestHeaderInfo>
<Username xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase" i:nil="true" />
<SSID>S-1-6-25-123456789-123456789-123456789-12345</SSID>
<miscdata xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
<d2p1:string>date:2020.02.26 08:27:00</d2p1:string>
<d2p1:string>hours:0</d2p1:string>
<d2p1:string>Ready:True</d2p1:string>
<d2p1:string>disct:False</d2p1:string>
<d2p1:string>extdisct:False</d2p1:string>
<d2p1:string>Matmove:False</d2p1:string>
<d2p1:string>Matlim:0</d2p1:string>
<d2p1:string>Comments:</d2p1:string>
</miscdata>
<ffreeID>468545</ffreeID>
</InvoiceRequest>'; --Assumed this should be </InvoiceRequest>, not <InvoiceRequest>.
--Get value
WITH XMLNAMESPACES(DEFAULT 'http://schemas.datacontract.org/2004/07/InternalReuqests')
SELECT X.Request.value('(/InvoiceRequest/ffreeID/text())[1]','int')
FROM (VALUES(#XML))X(Request);

Answer 2

Here is another way by simulating a mock table. Everything else resembles #Larnu's solution. All credit goes to #Larnu.
SQL
-- DDL and sample data population, start
DECLARE #tbl TABLE (ID INT IDENTITY PRIMARY KEY, Request XML);
INSERT INTO #tbl (Request)
VALUES
(N'<InvoiceRequest xmlns:i="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://schemas.datacontract.org/2004/07/InternalReuqests">
<ActiveUserID xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase">0</ActiveUserID>
<LinqConfigId xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase">0</LinqConfigId>
<RequestHeaderInfo xmlns:d2p1="Fix.Services"
xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase">
<d2p1:MapArchive i:nil="true"/>
<d2p1:HandledSuccessCategory>rscNone</d2p1:HandledSuccessCategory>
</RequestHeaderInfo>
<Username xmlns="http://schemas.datacontract.org/2004/07/Fix.ServiceBase" i:nil="true"/>
<SSID>S-1-6-25-123456789-123456789-123456789-12345</SSID>
<miscdata xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
<d2p1:string>date:2020.02.26 08:27:00</d2p1:string>
<d2p1:string>hours:0</d2p1:string>
<d2p1:string>Ready:True</d2p1:string>
<d2p1:string>disct:False</d2p1:string>
<d2p1:string>extdisct:False</d2p1:string>
<d2p1:string>Matmove:False</d2p1:string>
<d2p1:string>Matlim:0</d2p1:string>
<d2p1:string>Comments:</d2p1:string>
</miscdata>
<ffreeID>468545</ffreeID>
</InvoiceRequest>');
-- DDL and sample data population, end
WITH XMLNAMESPACES(DEFAULT 'http://schemas.datacontract.org/2004/07/InternalReuqests')
SELECT ID
, c.value('(ffreeID/text())[1]','INT') AS ffreeID
FROM #tbl AS tbl
CROSS APPLY tbl.Request.nodes('/InvoiceRequest') AS t(c);
Output
+----+---------+
| ID | ffreeID |
+----+---------+
| 1 | 468545 |
+----+---------+