Accessing values in XML from a variable in Oracle SQL - oracle

Question

I have a XML data as below in a variable p_val:
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:wsa="http://www.w3.org/2005/08/addressing">
<env:Header>
<wsa:MessageID>urn:bda29066-5961-11ec-87ec-0242c5d8b376</wsa:MessageID>
<wsa:ReplyTo>
<wsa:Address>http://www.w3.org/2005/08/addressing/anonymous</wsa:Address>
<wsa:ReferenceParameters>
<instra:tracking.ecid xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">9b657011-42e4-4cf4-a78e-537551de4cc0-0057ca4a</instra:tracking.ecid>
<instra:tracking.FlowEventId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">27818206</instra:tracking.FlowEventId>
<instra:tracking.FlowId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">169007626</instra:tracking.FlowId>
<instra:tracking.CorrelationFlowId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">0000NqYCMWFDGfdLxeG7yW1X_Nsm0003Yk</instra:tracking.CorrelationFlowId>
<instra:tracking.quiescing.SCAEntityId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">1830036</instra:tracking.quiescing.SCAEntityId>
</wsa:ReferenceParameters>
</wsa:ReplyTo>
<wsa:FaultTo>
<wsa:Address>http://www.w3.org/2005/08/addressing/anonymous</wsa:Address>
</wsa:FaultTo>
</env:Header>
<env:Body>
<LaunchSpreadSheetWorkFlowResponse xmlns="http://xmlns.oracle.com/bpmn/bpmnCloudProcess/ISV_ROYALTIES/ISVSpreadSheetMainProcess">
<instanceNumber xmlns:def="http://www.w3.org/2001/XMLSchema" xsi:type="def:long"
xmlns=""
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">79630772</instanceNumber>
</LaunchSpreadSheetWorkFlowResponse>
</env:Body>
</env:Envelope>
I want to access the value of the tag: instanceNumber which is 79630772.
If it is a direct payload instead of a variable I tried accessing it using:
select *
FROM XMLTABLE('/Envelope/Body/LaunchSpreadSheetWorkFlowResponse'
PASSING
xmltype('
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:wsa="http://www.w3.org/2005/08/addressing">
<env:Header>
<wsa:MessageID>urn:bda29066-5961-11ec-87ec-0242c5d8b376</wsa:MessageID>
<wsa:ReplyTo>
<wsa:Address>http://www.w3.org/2005/08/addressing/anonymous</wsa:Address>
<wsa:ReferenceParameters>
<instra:tracking.ecid xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">9b657011-42e4-4cf4-a78e-537551de4cc0-0057ca4a</instra:tracking.ecid>
<instra:tracking.FlowEventId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">27818206</instra:tracking.FlowEventId>
<instra:tracking.FlowId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">169007626</instra:tracking.FlowId>
<instra:tracking.CorrelationFlowId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">0000NqYCMWFDGfdLxeG7yW1X_Nsm0003Yk</instra:tracking.CorrelationFlowId>
<instra:tracking.quiescing.SCAEntityId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">1830036</instra:tracking.quiescing.SCAEntityId>
</wsa:ReferenceParameters>
</wsa:ReplyTo>
<wsa:FaultTo>
<wsa:Address>http://www.w3.org/2005/08/addressing/anonymous</wsa:Address>
</wsa:FaultTo>
</env:Header>
<env:Body>
<LaunchSpreadSheetWorkFlowResponse xmlns="http://xmlns.oracle.com/bpmn/bpmnCloudProcess/ISV_ROYALTIES/ISVSpreadSheetMainProcess">
<instanceNumber xmlns:def="http://www.w3.org/2001/XMLSchema" xsi:type="def:long"
xmlns=""
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">79630772</instanceNumber>
<name>XYZ</name>
</LaunchSpreadSheetWorkFlowResponse>
</env:Body>
</env:Envelope>
')
COLUMNS
temp2 varchar2(20) PATH './instanceNumber'
) xmlt
;
The above query returned an empty value.
How should I access the value from a variable?

Answer 1

You need to specify and supply the namespaces:
select *
FROM XMLTABLE(
XMLNAMESPACES(
default 'http://xmlns.oracle.com/bpmn/bpmnCloudProcess/ISV_ROYALTIES/ISVSpreadSheetMainProcess',
'http://schemas.xmlsoap.org/soap/envelope/' AS "env"
),
'/env:Envelope/env:Body/LaunchSpreadSheetWorkFlowResponse'
PASSING
...
COLUMNS
temp2 varchar2(20) PATH '*:instanceNumber'
) xmlt
;
The Envelope and Body come under the SOAP env namespace. In the XML document the LaunchSpreadSheetWorkFlowResponse node doesn't have a namespace prefix but defines a default namespace, so that default needs to be supplied too. Then it gets slightly awkward for instanceNumber as that node redefines (or clears) the default, and defines additional namespaces, but doesn't use them - which puts that node in limbo a bit. I've taken the easy route and wildcarded that with the *: prefix.
The less lazy way, I think, is to treat the LaunchSpreadSheetWorkFlowResponse as a separate XML fragment with a seconf XMLTable call:
select xmlt2.instanceNumber
FROM XMLTABLE(
XMLNAMESPACES(
default 'http://xmlns.oracle.com/bpmn/bpmnCloudProcess/ISV_ROYALTIES/ISVSpreadSheetMainProcess',
'http://schemas.xmlsoap.org/soap/envelope/' AS "env"
),
'/env:Envelope/env:Body/LaunchSpreadSheetWorkFlowResponse'
PASSING
...
COLUMNS
LaunchSpreadSheetWorkFlowResponse xmlType PATH '.'
) xmlt1
CROSS JOIN XMLTABLE(
'.'
PASSING
xmlt1.LaunchSpreadSheetWorkFlowResponse
COLUMNS
instanceNumber varchar2(20) PATH 'instanceNumber'
) xmlt2
;
I'm not sure it's worth it here, and I'd be tempted to stick to the wildcard version.
db<>fiddle showing both.