Using XML clob in loop

Question

Hi,
I need to extract data from a given piece of XML. If I pass the xml to the procedure as clob and query it in a loop, it returns no rows. However if I include the actuall xml in the loop query it returns the data I'm looking for. Why doesn't it return data when using the clob?
1. Example code below works with xml included in the loop query:
BEGIN
   FOR x IN (    SELECT x.*
                   FROM XMLTABLE (
                           xmlnamespaces (
                              'http://schemas.xmlsoap.org/soap/envelope' AS "x",
                              'http://www.w3.org/2001/XMLSchema-instance' AS "xsi"),
                           PASSING xmltype (
                                      '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <soapenv:Body>
      <loadServiceListResponse soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
         <loadServiceListReturn href="#id0"/>
      </loadServiceListResponse>
      <multiRef id="id0" soapenc:root="0" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="ns1:ExternalSystemOutput" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns1="java:ExternalSystemOutput.TestIPA.nhsia.nhs">
         <standardOutput href="#id1"/>
         <systemData soapenc:arrayType="ns2:ExternalSystemData[2]" xsi:type="soapenc:Array" xmlns:ns2="java:ExternalSystemData.TestIPA.nhsia.nhs">
            <systemData href="#id2"/>
            <systemData href="#id3"/>
         </systemData>
      </multiRef>
      <multiRef id="id3" soapenc:root="0" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="ns3:ExternalSystemData" xmlns:ns3="java:ExternalSystemData.TestIPA.nhsia.nhs" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
         <description xsi:type="soapenc:string">Prescription</description>
         <url xsi:type="soapenc:string">http://192.168.21.131:8080/nhsia/TestIPA/validate.jsp?sdwlhqw@5)vhuylfh@Suhvfulswlrq33509</url>
      </multiRef>
      <multiRef id="id1" soapenc:root="0" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="ns4:StandardOutput" xmlns:ns4="java:StandardOutput.TestIPA.nhsia.nhs" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
         <auditID xsi:type="soapenc:string"/>
         <statusID xsi:type="soapenc:string">0</statusID>
         <systemAvailability xsi:type="soapenc:string">Available</systemAvailability>
      </multiRef>
      <multiRef id="id2" soapenc:root="0" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="ns5:ExternalSystemData" xmlns:ns5="java:ExternalSystemData.TestIPA.nhsia.nhs" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
         <description xsi:type="soapenc:string">Appointment</description>
         <url xsi:type="soapenc:string">http://192.168.21.131:8080/nhsia/TestIPA/validate.jsp?vgzoktzC8,ykx|oikCGvvuotzsktz61409</url>
      </multiRef>
   </soapenv:Body>
</soapenv:Envelope>').
                                   EXTRACT (
                                      '//multiRef',
                                      'xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"')
                           COLUMNS description VARCHAR2 (30) PATH 'description',
                                   url VARCHAR2 (250) PATH 'url') x)
   LOOP
      DBMS_OUTPUT.PUT_LINE('Rec:  '||x.description||' '||x.url);
   END LOOP;
END;
/Returns:
Rec:  
Rec:  Prescription http://192.168.21.131:8080/nhsia/TestIPA/validate.jsp?sdwlhqw@5)vhuylfh@Suhvfulswlrq33509
Rec:  
Rec:  Appointment http://192.168.21.131:8080/nhsia/TestIPA/validate.jsp?vgzoktzC8,ykx|oikCGvvuotzsktz614092. If I assign the XML to CLOB variable and reference the clob variable in loop query it returns no data:
DECLARE
   resp   CLOB :=             
                   '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <soapenv:Body>
      <loadServiceListResponse soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
         <loadServiceListReturn href="#id0"/>
      </loadServiceListResponse>
      <multiRef id="id0" soapenc:root="0" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="ns1:ExternalSystemOutput" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns1="java:ExternalSystemOutput.TestIPA.nhsia.nhs">
         <standardOutput href="#id1"/>
         <systemData soapenc:arrayType="ns2:ExternalSystemData[2]" xsi:type="soapenc:Array" xmlns:ns2="java:ExternalSystemData.TestIPA.nhsia.nhs">
            <systemData href="#id2"/>
            <systemData href="#id3"/>
         </systemData>
      </multiRef>
      <multiRef id="id3" soapenc:root="0" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="ns3:ExternalSystemData" xmlns:ns3="java:ExternalSystemData.TestIPA.nhsia.nhs" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
         <description xsi:type="soapenc:string">Prescription</description>
         <url xsi:type="soapenc:string">http://192.168.21.131:8080/nhsia/TestIPA/validate.jsp?sdwlhqw@5)vhuylfh@Suhvfulswlrq33509</url>
      </multiRef>
      <multiRef id="id1" soapenc:root="0" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="ns4:StandardOutput" xmlns:ns4="java:StandardOutput.TestIPA.nhsia.nhs" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
         <auditID xsi:type="soapenc:string"/>
         <statusID xsi:type="soapenc:string">0</statusID>
         <systemAvailability xsi:type="soapenc:string">Available</systemAvailability>
      </multiRef>
      <multiRef id="id2" soapenc:root="0" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="ns5:ExternalSystemData" xmlns:ns5="java:ExternalSystemData.TestIPA.nhsia.nhs" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
         <description xsi:type="soapenc:string">Appointment</description>
         <url xsi:type="soapenc:string">http://192.168.21.131:8080/nhsia/TestIPA/validate.jsp?vgzoktzC8,ykx|oikCGvvuotzsktz61409</url>
      </multiRef>
   </soapenv:Body>
</soapenv:Envelope>';
BEGIN
   FOR x IN (    SELECT x.*
                   FROM XMLTABLE (
                           xmlnamespaces (
                              'http://schemas.xmlsoap.org/soap/envelope' AS "x",
                              'http://www.w3.org/2001/XMLSchema-instance' AS "xsi"),
                           PASSING xmltype (resp).
                                   EXTRACT (
                                      '//multiRef',
                                      'xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"')
                           COLUMNS description VARCHAR2 (30) PATH 'description',
                                   url VARCHAR2 (250) PATH 'url') x)
   LOOP
      DBMS_OUTPUT.PUT_LINE('Rec:  '||x.description||' '||x.url);
   END LOOP;
END;
/I would appreciate any help this one.
Cheers,
Andy.

Answer 1

Why do you have 4 rows? I don't understand why you have two rows for 100 bottles?
Building on Odie's answer and my example plus adding in the needed outer join we have, using Oracle's outer join syntax of (+)
SQL> with my_sample_table as (
  2      select xmltype('<?xml version="1.0" encoding="UTF-8" ?>
  3  <request>
  4  <identification>
  5  <requestid>12345</requestid>
  6  <periodunit>DAY</periodunit>
  7  <days>MONDAY</days>
  8  </identification>
  9  <product>
10  <productname>ABC PRODUCT</productname>
11  <brand>
12  <brandname>CELL</brandname>
13  <ndccode>A58048</ndccode>
14  <ndccode>A49210</ndccode>
15  </brand>
16  </product>
17  <product>
18  <productname>100 bottles</productname>
19  </product>
20  </request>') xmldoc
21      from dual
22    )
23  select x.*, y.*
24    from my_sample_table t
25       , xmltable(
26          'let $e := $d/request/identification
27           for $i in $d/request/product
28           return element r {
29             $e/requestid
30           , $e/days
31           , $e/periodunit
32           , $i/productname
33           , $i/brand/brandname
34           , $i/brand/ndccode
35           }'
36          passing t.xmldoc as "d"
37          columns requestid  number       path 'requestid'
38                , days       varchar2(30) path 'days'
39                , periodunit varchar2(10) path 'periodunit'
40                , prductname varchar2(20) path 'productname'
41                , brandname  varchar2(20) path 'brandname'
42                , ndccodexml xmltype      path 'ndccode'
43         ) x,
44         xmltable('/ndccode'
45                  PASSING x.ndccodexml
46                  COLUMNS
47                  ndccode    VARCHAR2(10) PATH '.') (+) y;
REQUESTID DAYS                           PERIODUNIT PRDUCTNAME           BRANDNAME            NDCCODEXML                                                                       NDCCODE
     12345 MONDAY                         DAY        ABC PRODUCT          CELL                 <ndccode>A58048</ndccode><ndccode>A49210</ndccode>                               A58048
     12345 MONDAY                         DAY        ABC PRODUCT          CELL                 <ndccode>A58048</ndccode><ndccode>A49210</ndccode>                               A49210
     12345 MONDAY                         DAY        100 bottles                                                                                                                If you prefer the ANSI syntax it would be (just showing changed section)
       ) x
       LEFT OUTER JOIN
       xmltable('/ndccode'
                PASSING x.ndccodexml
                COLUMNS
                ndccode    VARCHAR2(10) PATH '.') y
       ON 1=1;