How to select a particular Node name and its values in XML using Oracle SQL query?

问题

I have a table called SOAP_MONITORING in which i have RESPONSE_XML column which is CLOB datatype. In this column large xml string is stored. I want to get the node name and node value from this xml string. Here is my xml :

<?xml version='1.0' encoding='utf-8'?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><ns:placeShopOrderResponse xmlns:ns="http://service.soap.CDRator.com">
<ns:return xmlns:ax2133="http://signup.data.soap.CDRator.com/xsd" xmlns:ax2134="http://core.signup.data.soap.CDRator.com/xsd" xmlns:ax2127="http://data.soap.CDRator.com/xsd" xmlns:ax2129="http://webshop.data.soap.CDRator.com/xsd" xmlns:ax2130="http://core.data.soap.CDRator.com/xsd" xmlns:ax2140="http://core.result.service.soap.CDRator.com/xsd" xmlns:ax2139="http://result.service.soap.CDRator.com/xsd" xmlns:ax2147="http://webshop.result.service.soap.CDRator.com/xsd" xmlns:ax2148="http://mandate.result.service.soap.CDRator.com/xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ax2147:PlaceShopOrderResultDTO">
<ax2130:id xsi:nil="true" /><ax2140:description>SOAP_GLOBAL_SUCCESS</ax2140:description>
<ax2147:subscriptions xsi:type="ax2127:SubscriptionDTO"><ax2130:id>201501070917439804</ax2130:id>
<ax2130:id>201501070917439804</ax2130:id>
</ns:return></ns:placeShopOrderResponse>
</soapenv:Body>
</soapenv:Envelope>

I want to query this column in order to get the SUBSCRIPTION_ID which is 201501070917439804. I tried the above query

SELECT extractvalue(RESPONSE_XML, '/*/ax2130/*/id/@value')
FROM SOAP_MONITORING where WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder'

but received an error

ORA-00932: inconsistent datatypes: expected - got -
00932. 00000 -  "inconsistent datatypes: expected %s got %s"

I am very much new in order to run such queries to get the node value from xml.

回答1:

You can convert your CLOB to an XMLType, assuming it's valid, just with:

extractvalue(XMLType(RESPONSE_XML), ...

Not sure why your column type isn't XMLType if you're storing XML in it, but that's not entirely relevant.

You could then supply the namespace to extractvalue():

SELECT extractvalue(XMLType(RESPONSE_XML),
  '//ax2130:id/text()',
  'xmlns:ax2130="http://core.data.soap.CDRator.com/xsd"')
FROM SOAP_MONITORING
where WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder';

.. but you have multiple IDs, so you get: ORA-19025: EXTRACTVALUE returns value of only one node.

And extractvalue is deprecated, as noted in the documentation

You can use XQuery instead, specifically here an XMLTable.

Assuming you only want the ax2130:id values nested inside ax2147:subscription, you can use this XQuery:

SELECT xt.id
FROM SOAP_MONITORING sm
CROSS JOIN XMLTable(XMLNAMESPACES (
      'http://schemas.xmlsoap.org/soap/envelope/' AS "soapenv",
      'http://service.soap.CDRator.com' as "ns",
      'http://core.data.soap.CDRator.com/xsd' as "ax2130",
      'http://webshop.result.service.soap.CDRator.com/xsd' as "ax2147"
    ),
    'for $i in /soapenv:Envelope/soapenv:Body/ns:placeShopOrderResponse/ns:return/ax2147:subscriptions
      return $i/ax2130:id'
    passing XMLType(sm.RESPONSE_XML)
    columns "ID" number path '/') xt
where WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder';

                   ID
---------------------
   201501070917439804 
   201501070917439804 

 2 rows selected

Or if you want any ax:2130 node anywhere, including the blank one, you can use:

SELECT xt.id
FROM SOAP_MONITORING sm
CROSS JOIN XMLTable(XMLNAMESPACES (
      'http://core.data.soap.CDRator.com/xsd' as "ax2130"
    ),
    'for $i in //ax2130:id return $i'
    passing XMLType(sm.RESPONSE_XML)
    columns "ID" number path '/') xt
where WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder';

                   ID
---------------------

   201501070917439804 
   201501070917439804 

 3 rows selected

Only the namespaces referred to in the XQuery need to be specified in the XMLNamespaces clause.

You can join to another table based on the selected IDs if you need to:

SELECT xt.id
FROM SOAP_MONITORING sm
CROSS JOIN XMLTable(XMLNAMESPACES (
    ...) xt
JOIN someothertable sot on sot.id = xt.id
where sm.WEB_SERVICE_NAME='RatorWebShopService'
and sm.WEB_METHOD_NAME='placeShopOrder';

回答2:

Do:

"SELECT extractvalue(XMLTYPE(RESPONSE_XML), '/*/ax2130/*/id/@value')
     FROM SOAP_MONITORING where WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder'"

In stead of:

SELECT extractvalue(RESPONSE_XML, '/*/ax2130/*/id/@value')
    FROM SOAP_MONITORING where WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder'

来源：https://stackoverflow.com/questions/28214725/how-to-select-a-particular-node-name-and-its-values-in-xml-using-oracle-sql-quer

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xml-parsing

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