Getting Metadata of previous versions

Question

Hi ,
I have a requirement to store various versions of an XML using oracle Xml db. I also have some custom metadata which is associated to each version of the file.
We are having problems when updating the metadata.
We tried using DBMS_XDB.UPDATERESOURCEMETADATA but the metadata was not updated , only the version of the xml was incrementing.
Can some one help on the usage of "DBMS_XDB.UPDATERESOURCEMETADATA"
I would also like to know how to access the metadata of previous versions of xml.
Any information regarding these would be helpful.

Answer 1

probably doesn't help you anymore but might help others...?
-- Example by Mark D Drake, Oracle, OTN Developer Days
SQL> call dbms_xdb.deleteResource('/public/testcase.txt')
  2  /
Call completed.
SQL> declare
  2     targetPath VARCHAR2(256) := '/public/testcase.txt';
  3     result     BOOLEAN;
  4     resid      DBMS_XDB_VERSION.RESID_TYPE;
  5     token      VARCHAR2(4000);
  6  begin
  7    result := DBMS_XDB.createResource(targetPath,'This is the original Content');
  8    result := DBMS_XDB.lockResource(targetPath,FALSE,FALSE);
  9    resid := DBMS_XDB_VERSION.makeVersioned(targetPath);
10    DBMS_XDB_VERSION.checkout(targetPath);
11
12    update RESOURCE_VIEW set RES = updateXML(
13                                    RES,
14                                    '/Resource/Contents/text/text()',
15                                    'This is the new Content')
16     where equals_path(res,targetPath) = 1;
17
18    resid := DBMS_XDB_VERSION.checkin(targetPath);
19    DBMS_XDB.getLockToken(targetPath,token);
20    result := DBMS_XDB.unlockResource(targetPath,token);
21  end;
22  /
PL/SQL procedure successfully completed.
SQL> select xdburitype('/public/testcase.txt').getClob() from dual
  2  /
XDBURITYPE('/PUBLIC/TESTCASE.TXT').GETCLOB()
This is the new Content
SQL> create or replace type VERSION_HISTORY as table of XMLTYPE
  2  /
Type created.
SQL> create or replace function getVersionHistory(path VARCHAR2)
  2  return XMLSEQUENCETYPE pipelined
  3  as
  4    RESOURCE_ID  RAW(16);
  5    RES          XMLTYPE;
  6    SOURCE_LIST   DBMS_XDB_VERSION.RESID_LIST_TYPE;
  7  begin
  8    select RES, RESID
  9      into RES, RESOURCE_ID
10      from resource_view
11     where equals_path(res,path) = 1;
12     pipe row (RES);
13     SOURCE_LIST := DBMS_XDB_VERSION.GETPREDECESSORS(PATH);
14     while SOURCE_LIST.COUNT > 0 loop
15       pipe row (DBMS_XDB_VERSION.getResourceByResid(SOURCE_LIST(1)));
16       SOURCE_LIST := DBMS_XDB_VERSION.GETPREDSBYRESID(SOURCE_LIST(1));
17     end loop;
18    return;
19  end;
20  /
Function created.
SQL> select det.*
  2    from TABLE(getVersionHistory('/public/testcase.txt')) vh,
  3         XMLTABLE
  4         (
  5            xmlNamespaces(default 'http://xmlns.oracle.com/xdb/XDBResource.xsd' ),
  6            '/Resource'
  7            passing value(vh)
  8            columns
  9            VERSION_NO          NUMBER(3)  PATH '@VersionID',
10            DATE_CREATED     TIMESTAMP(6)  PATH 'CreationDate',
11            DATE_MODIFIED    TIMESTAMP(6)  PATH 'ModificationDate',
12            CONTENT          CLOB          PATH 'Contents/text/text()'
13         ) det
14  /
VERSION_NO
DATE_CREATED
DATE_MODIFIED
CONTENT
         2
06-MAY-11 07.00.53.537000 PM
06-MAY-11 07.00.53.561000 PM
This is the new Content
VERSION_NO
DATE_CREATED
DATE_MODIFIED
CONTENT
         1
06-MAY-11 07.00.53.537000 PM
06-MAY-11 07.00.53.537000 PM
This is the original Content
http://www.liberidu.com/blog/?p=2850