Cant read xml nodes from namespace - sql

Question

Basically I have an XML file which resembles this:
<gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref">
<Cube>
<Cube time="2018-06-15">
<Cube currency="USD" rate="1.2345"/>
<Cube currency="ZAR" rate="10.1"/>
</Cube>
<Cube time="2018-06-16">
<Cube currency="USD" rate="1.1596"/>
<Cube currency="ZAR" rate="9.546"/>
</Cube>
</Cube>
</gesmes:Envelope>
And I insert it like this:
INSERT INTO
fxRatesXml(xmlData, updatedOn)
SELECT
CONVERT(XML, bulkColumn),
GETDATE()
FROM
OPENROWSET(BULK 'I:\Downloads\eurofxref-hist-90d.xml', SINGLE_BLOB) as fxRateXmlData;
I then try to read the time, currency and rate like so:
DECLARE #xml AS XML, #hDoc AS INT, #sql NVARCHAR (MAX)
SELECT
#xml = xmlData
FROM
fxRatesXml
EXEC sp_xml_preparedocument #hDoc OUTPUT, #xml, '<root xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref"/>'
SELECT
*
FROM
OPENXML(#hDoc, 'gesmes:Cube')
WITH
(
[time] nvarchar(max) 'Cube/time',
currency nvarchar(max) 'Cube/Cube/currency',
rate nvarchar(max) 'Cube/Cube/rate'
)
EXEC sp_xml_removedocument #hDoc
but no luck.
I am not sure where I'm going wrong any help would be appreciated.
UPDATED
Updated XML to be more specific. It can include more then just 2 cubes of time and more then 2 currencies per cube of time.
How would I iterate/select them all?

Answer 1

Once you have populated the #xml variable, instead of using EXEC sp_xml_preparedocument, try to define the namespaces you need using ;WITH XMLNAMESPACES:
I added the missing closing tag </gesmes:Envelope> at the end of the xml, so I tested my query with the following xml:
<gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref">
<Cube>
<Cube time="2018-06-15">
<Cube currency="USD" rate="1.1596"/>
</Cube>
</Cube>
</gesmes:Envelope>
This is the query to retrieve tha data from xml variable #xml:
declare #xml xml = '<gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref"> <Cube> <Cube time="2018-06-15"> <Cube currency="USD" rate="1.1596"/> </Cube> </Cube> </gesmes:Envelope>'
;WITH XMLNAMESPACES('http://www.gesmes.org/xml/2002-08-01' AS gesmes,
'http://www.ecb.int/vocabulary/2002-08-01/eurofxref' as ns)
SELECT
T.X.value('ns:Cube[1]/#currency','varchar(500)') AS [currency],
T.X.value('ns:Cube[1]/#rate','varchar(500)') AS [rate],
T.X.value('./#time','varchar(500)') AS [time]
FROM
#xml.nodes('/gesmes:Envelope/ns:Cube/ns:Cube') AS T(X)
Results:
To handle multiple <Cube> tags:
<gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref">
<Cube>
<Cube time="2018-06-15">
<Cube currency="USD" rate="1.2345"/>
<Cube currency="ZAR" rate="10.1"/>
</Cube>
<Cube time="2018-06-16">
<Cube currency="USD" rate="1.1596"/>
<Cube currency="ZAR" rate="9.546"/>
</Cube>
</Cube>
</gesmes:Envelope>
you can use this query:
declare #xml xml ='<gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref"> <Cube> <Cube time="2018-06-15"> <Cube currency="USD" rate="1.2345"/> <Cube currency="ZAR" rate="10.1"/> </Cube> <Cube time="2018-06-16"> <Cube currency="USD" rate="1.1596"/> <Cube currency="ZAR" rate="9.546"/> </Cube> </Cube> </gesmes:Envelope>'
;WITH XMLNAMESPACES('http://www.gesmes.org/xml/2002-08-01' AS gesmes,
'http://www.ecb.int/vocabulary/2002-08-01/eurofxref' as ns)
SELECT T.X.value('(.)[1]/#currency','varchar(500)') AS [currency]
,T.X.value('(.)[1]/#rate','varchar(500)') AS [rate]
,T.X.value('(..)[1]/#time','varchar(500)') AS [time]
FROM #xml.nodes('/gesmes:Envelope/ns:Cube/ns:Cube/ns:Cube') AS T(X)
Results: