How to fulltext index more words - for example P A NC

Question

Hi everybody,
I need to fulltext index a special phrase, for example P A NC, B A KLP, PO A BZ, etc. White space is standard delimiter words.
I need oposite to stopwords
Could you help me
Thanks
Martin

Answer 1

Not quite sure what you're looking for.  You can turn off stopwords by using "stoplist ctxsys.empty_stoplist" in the parameters clause.  But are you looking to index those phrases as single tokens?  That can't be done without pre-processing the text in some fashion, perhaps replacing the spaces with a special character and defining that as a PRINTJOINS character, so that "P A NC" is indexed as "P+A+NC" or similar.
SQL> create table foo (bar varchar2(2000));
Table created.
SQL> insert into foo values ('the quick brown P A NC jumps over the lazy B A KLP');
1 row created.
SQL> update foo set bar = regexp_replace( bar, 'P A NC', 'P+A+NC');
1 row updated.
SQL> update foo set bar = regexp_replace( bar, 'B A KLP', 'B+A+KLP');
1 row updated.
SQL> select bar from foo;
BAR
the quick brown P+A+NC jumps over the lazy B+A+KLP
SQL> exec ctx_ddl.create_preference('mylex', 'BASIC_LEXER')
PL/SQL procedure successfully completed.
SQL> exec ctx_ddl.add_attribute('mylex', 'PRINTJOINS', '+')
BEGIN ctx_ddl.add_attribute('mylex', 'PRINTJOINS', '+'); END;
ERROR at line 1:
ORA-06550: line 1, column 15:
PLS-00302: component 'ADD_ATTRIBUTE' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
SQL> exec ctx_ddl.set_attribute('mylex', 'PRINTJOINS', '+')
PL/SQL procedure successfully completed.
SQL> create index fooindex on foo(bar) indextype is ctxsys.context
  2  parameters ('lexer mylex stoplist ctxsys.empty_stoplist');
Index created.
SQL> select * from foo where contains (bar, 'B+A+KLP') > 0;
BAR
the quick brown P+A+NC jumps over the lazy B+A+KLP