Querying res column of RESOURCE_VIEW

Question

Mark ,
i want to create a resource on the repository, and then create views based on xpath, update some tables and then delete the resource.
Now when i place the xml file in a xmltpye column every thing works fine. But it seems to be bit tricky wheni want to query from RES column. Might be problem with multiple namespace being used for each resource, not sure about it.
Now till here i am able to query successfully as you see the output.
SQL> select
  2   extract(res, '/Resource/Contents').getclobval()
  3  from resource_view
  4  where any_path like '/public/labor/sequencedata.xml'
  5  /
<Contents xmlns="http://xmlns.oracle.com/xdb/XDBResource.xsd">
  <SequenceData>
    <Header>
      <id>285062</id>
      <TemplateName>1 dup</TemplateName>
      <TemplateVersion>1</TemplateVersion>
      <CreUser>AJB2KOR</CreUser>
      <CreDate>02-SEP-05</CreDate>
    </Header>
    <Variables>
      <SetPhaseVariables/>
      <MeasPhaseVariables>
        <MeasPhaseVariable>
          <Name>TimeStamp</Name>
          <Unit>Sec</Unit>
        </MeasPhaseVariable>
      </MeasPhaseVariables>
      <MonitoredVariables>
        <MonitoredVariable>
          <Name>Svar b</Name>
          <Unit>b</Unit>
        </MonitoredVariable>
        <MonitoredVariable>
          <Name>Svar c</Name>
          <Unit>c</Unit>
        </MonitoredVariable>
      </MonitoredVariables>
    </Variables>
    <LoadPoint LevelNumber="1" id="114103" Description="LOADPOINT: (werwrwrw)">
      <LoopCount InnerLoop="1" OuterLoop="1">
        <MonitoredVariables/>
        <SetPhase>
          <MonitoredVariables/>
          <SetPhaseVariables/>
        </SetPhase>
        <WaitPhase>
          <WaitingTime>0</WaitingTime>
          <MonitoredVariables/>
        </WaitPhase>
        <MeasPhase>
          <MeasPhaseLoopRun/>
          <Manual>N</Manual>
          <MeasPhaseVariables/>
        </MeasPhase>
      </LoopCount>
    </LoadPoint>
  </SequenceData>
</Contents>
now when i want to navigate one more level below to the SequenceData it does not work.
SQL> select
  2   extract(res, '/Resource/Contents/SequenceData').getclobval()
  3  from resource_view
  4  where any_path like '/public/labor/sequencedata.xml'
  5  /
SQL>

Answer 1

Hi Raghu
You were on the right lines.. See below
SQL> set long 1000 pages 0
SQL> --
SQL> var targetPath varchar2(256)
SQL> --
SQL> begin
  2    :targetPath := '/public/testcase.xml';
  3  end;
  4  /
PL/SQL procedure successfully completed.
SQL> declare
  2    res boolean;
  3    contents xmltype := xmltype(
  4  '<SequenceData>
  5     <Header>
  6             <id>285062</id>
  7             <TemplateName>1 dup</TemplateName>
  8             <TemplateVersion>1</TemplateVersion>
  9             <CreUser>AJB2KOR</CreUser>
10             <CreDate>02-SEP-05</CreDate>
11     </Header>
12     <Variables>
13             <SetPhaseVariables/>
14             <MeasPhaseVariables>
15                     <MeasPhaseVariable>
16                             <Name>TimeStamp</Name>
17                             <Unit>Sec</Unit>
18                     </MeasPhaseVariable>
19             </MeasPhaseVariables>
20             <MonitoredVariables>
21                     <MonitoredVariable>
22                             <Name>Svar b</Name>
23                             <Unit>b</Unit>
24                     </MonitoredVariable>
25                     <MonitoredVariable>
26                             <Name>Svar c</Name>
27                             <Unit>c</Unit>
28                     </MonitoredVariable>
29             </MonitoredVariables>
30     </Variables>
31     <LoadPoint LevelNumber="1" id="114103" Description="LOADPOINT: (werwrwrw)">
32             <LoopCount InnerLoop="1" OuterLoop="1">
33                     <MonitoredVariables/>
34                     <SetPhase>
35                             <MonitoredVariables/>
36                             <SetPhaseVariables/>
37                     </SetPhase>
38                     <WaitPhase>
39                             <WaitingTime>0</WaitingTime>
40                             <MonitoredVariables/>
41                     </WaitPhase>
42                     <MeasPhase>
43                             <MeasPhaseLoopRun/>
44                             <Manual>N</Manual>
45                             <MeasPhaseVariables/>
46                     </MeasPhase>
47             </LoopCount>
48     </LoadPoint>
49  </SequenceData>');
50  begin
51    if (dbms_xdb.existsResource(:targetPath)) then
52      dbms_xdb.deleteResource(:targetPath);
53    end if;
54    res := dbms_xdb.createResource(:targetPath,contents);
55  end;
56  /
PL/SQL procedure successfully completed.
SQL> commit;
Commit complete.
SQL> /
Commit complete.
SQL> select extract(res, '/Resource/Contents', 'xmlns="http://xmlns.oracle.com/xdb/XDBResource.xsd"').getclobval()
  2    from resource_view
  3   where equals_path(res, :targetPath) = 1
  4  /
<Contents xmlns="http://xmlns.oracle.com/xdb/XDBResource.xsd"><SequenceData xmln
s=""><Header><id>285062</id><TemplateName>1 dup</TemplateName><TemplateVersion>1
</TemplateVersion><CreUser>AJB2KOR</CreUser><CreDate>02-SEP-05</CreDate></Header
<Variables><SetPhaseVariables/><MeasPhaseVariables><MeasPhaseVariable><Name>TimeStamp</Name><Unit>Sec</Unit></MeasPhaseVariable></MeasPhaseVariables><Monitored
Variables><MonitoredVariable><Name>Svar b</Name><Unit>b</Unit></MonitoredVariabl
e><MonitoredVariable><Name>Svar c</Name><Unit>c</Unit></MonitoredVariable></Moni
toredVariables></Variables><LoadPoint LevelNumber="1" id="114103" Description="L
OADPOINT: (werwrwrw)"><LoopCount InnerLoop="1" OuterLoop="1"><MonitoredVariables
/><SetPhase><MonitoredVariables/><SetPhaseVariables/></SetPhase><WaitPhase><Wait
ingTime>0</WaitingTime><MonitoredVariables/></WaitPhase><MeasPhase><MeasPhaseLoo
pRun/><Manual>N</Manual><MeasPhaseVariables/></MeasPhase></LoopCount></LoadPoint
</SequenceData></Contents>
SQL> select extract(res, '/r:Resource/r:Contents/SequenceData', 'xmlns:r="http://xmlns.oracle.com/xdb/XDBResource.xsd"').getclobval()
  2    from resource_view
  3   where equals_path(res, :targetPath) = 1
  4  /
<SequenceData><Header><id>285062</id><TemplateName>1 dup</TemplateName><Template
Version>1</TemplateVersion><CreUser>AJB2KOR</CreUser><CreDate>02-SEP-05</CreDate
</Header><Variables><SetPhaseVariables/><MeasPhaseVariables><MeasPhaseVariable><Name>TimeStamp</Name><Unit>Sec</Unit></MeasPhaseVariable></MeasPhaseVariables><
MonitoredVariables><MonitoredVariable><Name>Svar b</Name><Unit>b</Unit></Monitor
edVariable><MonitoredVariable><Name>Svar c</Name><Unit>c</Unit></MonitoredVariab
le></MonitoredVariables></Variables><LoadPoint LevelNumber="1" id="114103" Descr
iption="LOADPOINT: (werwrwrw)"><LoopCount InnerLoop="1" OuterLoop="1"><Monitored
Variables/><SetPhase><MonitoredVariables/><SetPhaseVariables/></SetPhase><WaitPh
ase><WaitingTime>0</WaitingTime><MonitoredVariables/></WaitPhase><MeasPhase><Mea
sPhaseLoopRun/><Manual>N</Manual><MeasPhaseVariables/></MeasPhase></LoopCount></
LoadPoint></SequenceData>
SQL> select xdburitype(:targetPath).getClob()
  2    from dual
  3  /
<SequenceData>
  <Header>
    <id>285062</id>
    <TemplateName>1 dup</TemplateName>
    <TemplateVersion>1</TemplateVersion>
    <CreUser>AJB2KOR</CreUser>
    <CreDate>02-SEP-05</CreDate>
  </Header>
  <Variables>
    <SetPhaseVariables/>
    <MeasPhaseVariables>
      <MeasPhaseVariable>
        <Name>TimeStamp</Name>
        <Unit>Sec</Unit>
      </MeasPhaseVariable>
    </MeasPhaseVariables>
    <MonitoredVariables>
      <MonitoredVariable>
        <Name>Svar b</Name>
        <Unit>b</Unit>
      </MonitoredVariable>
      <MonitoredVariable>
        <Name>Svar c</Name>
        <Unit>c</Unit>
      </MonitoredVariable>
    </MonitoredVariables>
  </Variables>
  <LoadPoint LevelNumber="1" id="114103" Description="LOADPOINT: (werwrwrw)">
    <LoopCount InnerLoop="1" OuterLoop="1">
      <MonitoredVariables/>
      <SetPhase>
        <MonitoredVariables/>
        <SetPhaseVariables/>
      </SetPhase>
      <WaitPhase>
        <WaitingTime>0</WaitingTime>
        <MonitoredVariabl
SQL>The problem is that we will assume the default namespace is the targetNamespace for SB XMLType, which is fine until you try and access a node that is in the 'noNamespace' namespace. Making use of that assumption is bad programming practice, you should always explicitly provide namespace declarations for all namespaces when querying XML.
BTW as you can see you can also get direct access to the contents of a resource using xdburitype.