How to query a simple XML - any example?

Question

Folks, I have a below XML stored within table, column type XMLTYPE.
I would like to extract all data from it by using some simple query + later insert returned rows into some dummy table.
This should be an easy task for somebody who is using XML on daily basis.
<env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'>
  <env:Header></env:Header>
  <env:Body>
    <ns1:getVehiclesResponse xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns1="http://wirelesscar.com/dynafleet/api/types">
      <result>
        <vehicleInfos>
          <displayName>TRUCK 1</displayName>
          <vehicleId>
            <id>15631444</id>
          </vehicleId>
        </vehicleInfos>
        <vehicleInfos>
          <displayName>TRUCK 2</displayName>
          <vehicleId>
            <id>1564652</id>
          </vehicleId>
        </vehicleInfos>
        <vehicleInfos>
          <displayName>TRUCK 3</displayName>
          <vehicleId>
            <id>15634543</id>
          </vehicleId>
        </vehicleInfos>
      </result>
    </ns1:getVehiclesResponse>
  </env:Body>
</env:Envelope>XML is stored in table TEST_XML column XML_DATA:
select  ...
           extract(dr.response_env, '//result/vehicleInfos/displayName/text()').getStringVal()
   from TEST_XMLI would like to extract all nodes from <result> through some query.
Kind regards,
Tomas

Answer 1

the "extract" function is deprecated from 11g. You'd be better using XMLTABLE...
e.g.
SQL> ed
Wrote file afiedt.buf
  1  WITH t as (select XMLTYPE('
  2  <RECSET xmlns:aa="http://www.w3.org">
  3    <aa:REC>
  4      <aa:COUNTRY>1</aa:COUNTRY>
  5      <aa:POINT>1800</aa:POINT>
  6      <aa:USER_INFO>
  7        <aa:USER_ID>1</aa:USER_ID>
  8        <aa:TARGET>28</aa:TARGET>
  9        <aa:STATE>6</aa:STATE>
10        <aa:TASK>12</aa:TASK>
11      </aa:USER_INFO>
12      <aa:USER_INFO>
13        <aa:USER_ID>5</aa:USER_ID>
14        <aa:TARGET>19</aa:TARGET>
15        <aa:STATE>1</aa:STATE>
16        <aa:TASK>90</aa:TASK>
17      </aa:USER_INFO>
18    </aa:REC>
19    <aa:REC>
20      <aa:COUNTRY>2</aa:COUNTRY>
21      <aa:POINT>2400</aa:POINT>
22      <aa:USER_INFO>
23        <aa:USER_ID>3</aa:USER_ID>
24        <aa:TARGET>14</aa:TARGET>
25        <aa:STATE>7</aa:STATE>
26        <aa:TASK>5</aa:TASK>
27      </aa:USER_INFO>
28    </aa:REC>
29  </RECSET>') as xml from dual)
30  -- END OF TEST DATA
31  select x.country, x.point, y.user_id, y.target, y.state, y.task
32  from t
33      ,XMLTABLE(XMLNAMESPACES('http://www.w3.org' as "aa"),
34                '/RECSET/aa:REC'
35                PASSING t.xml
36                COLUMNS country NUMBER PATH '/aa:REC/aa:COUNTRY'
37                       ,point   NUMBER PATH '/aa:REC/aa:POINT'
38                       ,user_info XMLTYPE PATH '/aa:REC/*'
39               ) x
40      ,XMLTABLE(XMLNAMESPACES('http://www.w3.org' as "aa"),
41                '/aa:USER_INFO'
42                PASSING x.user_info
43                COLUMNS user_id NUMBER PATH '/aa:USER_INFO/aa:USER_ID'
44                       ,target  NUMBER PATH '/aa:USER_INFO/aa:TARGET'
45                       ,state   NUMBER PATH '/aa:USER_INFO/aa:STATE'
46                       ,task    NUMBER PATH '/aa:USER_INFO/aa:TASK'
47*              ) y
SQL> /
   COUNTRY      POINT    USER_ID     TARGET      STATE       TASK
         1       1800          1         28          6         12
         1       1800          5         19          1         90
         2       2400          3         14          7          5
SQL>Have a go at applying that to your own XML, passing your own XMLTYPE data into the XMLTABLE and specifying your own Xquery paths
(I provided you with an example with namespaces in it as they can be tricky too)