Assigning score based on criteria

Question

I have the following test case on Oracle 10gR2
CREATE TABLE t (id  VARCHAR2 (60), data clob)
INSERT ALL
    INTO t (id, data) VALUES ('Test_1', '<book title="Tale">
            It was the best of times.
     </book> ')
    INTO t (id, data) VALUES ('Test_2', '<book title="Disclosure">
            Opening times.
     </book>')
    INTO t (id, data) VALUES ('Test_3', '<book title="Blue">
            No of times.
     </book> ')
    INTO t (id, data) VALUES ('Test_4', '<book title="Olympics">
            It was the best of times.
     </book> ')
    SELECT * FROM DUAL
BEGIN
     Ctx_Ddl.drop_Preference ('my_lexer');
END;
BEGIN
     Ctx_Ddl.Create_Preference ('my_lexer','BASIC_LEXER');
     Ctx_Ddl.Set_Attribute ( 'my_lexer', 'mixed_case', 'FALSE');
     Ctx_Ddl.Set_Attribute ( 'my_lexer', 'base_letter','TRUE');
END;
BEGIN
     Ctx_Ddl.drop_section_group ('myxmlgroup');
END;
begin
     ctx_ddl.create_section_group('myxmlgroup', 'XML_SECTION_GROUP');
     ctx_ddl.add_zone_section('myxmlgroup', 'book', 'book');
     ctx_ddl.add_attr_section('myxmlgroup', 'booktitle', 'book@title');
end;
CREATE INDEX t_data_idx ON t (data) INDEXTYPE IS ctxsys.context
     PARAMETERS
          ('LEXER  my_lexer
                  datastore ctxsys.default_datastore
                  filter ctxsys.null_filter
                  section group myxmlgroup'
If searching with the string "times", would it be possible to get the following result
     1. for hits in <book title="Blue"> should have highest score
     2. for hits in <book title="Disclosure"> should have second highest score
     3. for hits in <book title="Tale"> should have third highest score
     4. for hits other than the above 3 should have the lowest score
The result should be for example
ID                         Element                       Score
Test_3                    Blue                    10     -- sample score
Test_2                    Disclosure               8     
Test_1                    Tale                    6     
Test_4                    Olympics               3Could anyone kindly help me on this please
Thanking you in advance
Raj
Edited by: udayaraj on Sep 11, 2012 1:29 AM
Edited by: udayaraj on Sep 11, 2012 1:30 AM
Edited by: udayaraj on Sep 11, 2012 1:34 AM
Edited by: udayaraj on Sep 11, 2012 1:36 AM

Answer 1

Hello Roger
I was trying the solution you had given me on the original data, but the result seems to be not in proper order. Could you kindly have a look?
Oracle DB version - Enterprise edition 10.2.0.5.0
raj@cms> drop table c
  2  /
Table dropped.
Elapsed: 00:00:00.18
raj@cms>
raj@cms> create table c(id varchar2(255), c_type_id number(4), data clob)
  2  /
Table created.
Elapsed: 00:00:00.02
raj@cms>
raj@cms> alter table c add constraint c_PK primary key (id, c_type_id)
  2  /
Table altered.
Elapsed: 00:00:00.02
raj@cms> insert all
  2  into c (id, c_Type_id, data) values
  3  ('POI_DE3_TAX_19701106_0001', 1701, '<n-docbody>
  4                 <poi class="id">POI_DE3_TAX_19701106_0001 DE3_TAX_19701106_0001</poi>
  5                 <poi class="pk">昭和45年11月 6日</poi>
  6                 <poi class="fk">昭和45年 9月30日</poi>
  7                 <poi class="abstract">共同相続人</poi>
  8            </n-docbody>')
  9  into c (id, c_type_id, data) values
10  ('POI_DE3_TAX_19700930_0002', 1701, '<n-docbody>
11                 <poi class="id">POI_DE3_TAX_19700930_0002 DE3_TAX_19700930_0002</poi>
12                 <poi class="pk">DE3 昭和45年 9月30日</poi>
13                 <poi class="fk">昭和45年11月 6日</poi>
14                 <poi class="abstract">有価証券の売買は</poi>
15            </n-docbody>')
16  into c (id, c_type_id, data) values
17  ('POI_DE3_TAX_19701029_0003', 1701, '<n-docbody>
18                 <poi class="id">POI_DE3_TAX_19701029_0003 DE3_TAX_19701029_0003</poi>
19                 <poi class="pk">昭和45年10月29日</poi>
20                 <poi class="abstract">昭和45年11月6日 0001、　昭和45年9月30日 </poi>
21            </n-docbody>')
22  select * from dual
23  /
3 rows created.
Elapsed: 00:00:00.02
raj@cms>
raj@cms> begin
  2       Ctx_Ddl.Drop_Preference('my_jp_lexer');
  3  end;
  4  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01
raj@cms>
raj@cms> begin
  2       Ctx_Ddl.Create_Preference('my_jp_lexer','JAPANESE_VGRAM_LEXER');
  3  end;
  4  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01
raj@cms>
raj@cms>
raj@cms> begin
  2       ctx_ddl.drop_section_group('poigroup');
  3  end;
  4  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01
raj@cms>
raj@cms> begin
  2       ctx_ddl.create_section_group('poigroup', 'XML_SECTION_GROUP');
  3       ctx_ddl.add_zone_section('poigroup', 'poi', 'poi');
  4       ctx_ddl.add_attr_section('poigroup', 'poiclass', 'poi@class');
  5  end;
  6  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01
raj@cms>
raj@cms> CREATE INDEX
  2       c_text_index ON c(DATA)
  3  INDEXTYPE
  4       IS CTXSYS.CONTEXT
  5  PARAMETERS(
  6            'transactional
  7            LEXER my_jp_lexer
  8            sync (every "SYSDATE+30/1440" MEMORY 300M PARALLEL 2)
  9            STOPLIST ctxsys.default_stoplist
10            filter ctxsys.null_filter
11            section group poigroup
12            '
13         )
14  /
Index created.
Elapsed: 00:00:00.13
raj@cms> select
  2       id, score(1)
  3  from c
  4  where
  5       contains (data, '<query>
  6                        <textquery>
  7                               <progression>
  8                                      <seq>昭和45年11月 6日 AND (id WITHIN poiclass)*10*10</seq>
  9                                      <seq>昭和45年11月 6日 AND (pk WITHIN poiclass)*10*10</seq>
10                                      <seq>昭和45年11月 6日 AND (fk WITHIN poiclass)*10*10</seq>
11                                      <seq>昭和45年11月 6日</seq>
12                              </progression>
13                        </textquery>
14                 </query>', 1) > 0
15  order by
16       score(1) desc
17  /
ID                                         SCORE(1)
POI_DE3_TAX_19701106_0001                        76
POI_DE3_TAX_19701029_0003                        76
POI_DE3_TAX_19700930_0002                        76
Elapsed: 00:00:00.04
raj@cms>
raj@cms> select
  2       id, xt.class, score(1)
  3  from c, xmltable( '/n-docbody/poi' PASSING XMLTYPE(c.data)
  4                    COLUMNS class VARCHAR2(30) PATH '@class'
  5                  ) as xt
  6  where
  7       contains (data, '<query>
  8                        <textquery>
  9                               <progression>
10                                      <seq>昭和45年11月 6日 AND (id WITHIN poiclass)*10*10</seq>
11                                      <seq>昭和45年11月 6日 AND (pk WITHIN poiclass)*10*10</seq>
12                                      <seq>昭和45年11月 6日 AND (fk WITHIN poiclass)*10*10</seq>
13                                      <seq>昭和45年11月 6日</seq>
14                              </progression>
15                        </textquery>
16                 </query>', 1) > 0
17  order by
18       score(1) desc
19  /
ID                                       CLASS                                                          SCORE(1)
POI_DE3_TAX_19701106_0001                id                                                                   76
POI_DE3_TAX_19701106_0001                pk                                                                   76
POI_DE3_TAX_19701106_0001                fk                                                                   76
POI_DE3_TAX_19701106_0001                abstract                                                             76
POI_DE3_TAX_19700930_0002                id                                                                   76
POI_DE3_TAX_19701029_0003                abstract                                                             76
POI_DE3_TAX_19700930_0002                fk                                                                   76
POI_DE3_TAX_19700930_0002                abstract                                                             76
POI_DE3_TAX_19701029_0003                id                                                                   76
POI_DE3_TAX_19701029_0003                pk                                                                   76
POI_DE3_TAX_19700930_0002                pk                                                                   76
11 rows selected.
Elapsed: 00:00:00.07The results should be in the following order
1. POI_DE3_TAX_19701106_0001 => The string "昭和45年11月 6日" which is being searched, exists in <poi class=pk> so should have higher score
2. POI_DE3_TAX_19700930_0002 => The string "昭和45年11月 6日" which is being searched, exists in <poi class=fk> so should have second highest score
3. POI_DE3_TAX_19701029_0003 => The string "昭和45年11月 6日" which is being searched, does not exist in <poi class=pk> or <poi class=fk> but in <poi class=abstract> so should have the lowest score
Also for the query which extracts the "class", the resultset shows matches for <poi class="id">. The string "昭和45年11月 6日" does'nt exist in <poi class="id"> at all.
Thanking you in advance
Kind Regards
Raj