The default values of punctuation Lexer and endjoins
I use Oracle Text 11.2.0.2.0. I have a CTXCAT index with prefix.I am the lexer as creation
ctx_ddl.create_preference ("MY_LEXER", "BASIC_LEXER");
ctx_ddl.set_attribute ('MY_LEXER', ' PRINTJOINS', ' ',.-"() / ^ &" ');
in my ctxcat index.
However if the period is the end of a word I can't do to precede the search inside.
Select * from mytab where catsearch
(SRCH_NM, "b.b. *", ") > 0
Is dot (.) punctuation or endjoins considered.
How can I know what is is the default values used for punctuation signs, endjoins? and how can I can so that the punctuation is empty?
Thank you.
Have a good holiday.
As you can imagine, the period is punctuation by default. You can view the attributes for the basic_lexer, followed by their default values here:
http://docs.Oracle.com/CD/E11882_01/text.112/e24436/cdatadic.htm#CIHHBAAD
So, if you reset the attributes for punctuation for your lexer to just the question mark and exclamation point, then it works as you want, as shown below. You can see the tokens that are created as a result of indexing by selecting Dr.$ symbolic column of the Dr.$ your_index_name$ I index of area table. Keep in mind that, if you are looking for any word which is the last word in a sentence, followed by a period, you will now have to include this period, or a wildcard character in your search.
SCOTT@orcl_11gR2> create table mytab
2 (srch_nm varchar2 (30))
3 /
Table created.
SCOTT@orcl_11gR2> insert all
2 into mytab values ('B.B. HEMPHIL')
3 select * from dual
4 /
1 row created.
SCOTT@orcl_11gR2> begin
2 ctx_ddl.create_preference ('MY_LEXER', 'BASIC_LEXER');
3 ctx_ddl.set_attribute ('MY_LEXER', 'PRINTJOINS', ',.-''()/^&"');
4 ctx_ddl.set_attribute ('MY_LEXER', 'PUNCTUATIONS', '?!');
5 end;
6 /
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> create index my_index
2 on mytab (srch_nm)
3 indextype is ctxsys.ctxcat
4 parameters ('lexer my_lexer')
5 /
Index created.
SCOTT@orcl_11gR2> -- tokens created by indexing:
SCOTT@orcl_11gR2> select dr$token from dr$my_index$i
2 /
DR$TOKEN
----------------------------------------------------------------
B.B.
HEMPHIL
2 rows selected.
SCOTT@orcl_11gR2> select * from mytab where catsearch
2 (SRCH_NM, 'b.b.*', '') > 0
3 /
SRCH_NM
------------------------------
B.B. HEMPHIL
1 row selected.
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