The text index can do for me?
Hi allI have the following question to und of the oracle text index requirements:
I saved in the VARCHAR2 column some channels:
CREATE TABLE t1
(STR VARCHAR2(200));
INSERT INTO t1 (STR)
VALUES ('Abcd');
INSERT INTO t1 (STR)
VALUES ('abcd');
INSERT INTO t1 (STR)
VALUES ('Aabcd');
INSERT INTO t1 (STR)
VALUES ('Abcd-ef');
INSERT INTO t1 (STR)
VALUES ('Abcd ef');
INSERT INTO t1 (STR)
VALUES ('Abcd - ef');
INSERT INTO t1 (STR)
VALUES ('Abcd - 12');
INSERT INTO t1 (STR)
VALUES ('Abcd_ef12');
INSERT INTO t1 (STR)
VALUES ('Abcdef');
INSERT INTO t1 (STR)
VALUES ('Abcdgh');
INSERT INTO t1 (STR)
VALUES ('Abcdij');
INSERT INTO t1 (STR)
VALUES ('Abcdklmnop');
COMMIT;
Then I create an index of text with the following script:BEGIN
CTX_DDL.CREATE_PREFERENCE('SUBSTR_PREF','BASIC_WORDLIST');
CTX_DDL.SET_ATTRIBUTE('SUBSTR_PREF','SUBSTRING_INDEX','TRUE');
CTX_DDL.CREATE_PREFERENCE('pj_lex', 'BASIC_LEXER');
CTX_DDL.SET_ATTRIBUTE('pj_lex', 'PRINTJOINS', '-');
CTX_DDL.CREATE_PREFERENCE('mcds_t1_str', 'MULTI_COLUMN_DATASTORE');
CTX_DDL.SET_ATTRIBUTE('mcds_t1_str', 'COLUMNS', '''XZX''||STR');
END;
/
CREATE INDEX IDX_T1_STR ON T1
(STR)
INDEXTYPE IS CTXSYS.CONTEXT
PARAMETERS('wordlist SUBSTRING_PREF
LEXER pj_lex
DATASTORE mcds_t1_str
memory 50m')
NOPARALLEL;
My requirements are: when I look for "abcd" (WHERE contains (STR, "Frederick" |: var1 |)) » %') > 0) :I should get: Abcd, abcd, Abcd-ef, ef Abcd, Abcd - ef, Abcd - 12, Abcd_ef12, but not Abcdef*, Abcdgh*, *Abcdij*, Abcdklmnop*, Aabcd*.
The search text must begin with "abcd" (case sensitive), after "abcd", he must have 1 or more characters that start with test blank, '-', '_', or any other special characters, but should not begin with a letter.
Is it possible to do this with the oracle text index?
Concerning
S Max wrote:
Hi, thanks!
Is it possible to the value ' * ' as PRINTJOINS and SKIPJOINS?
Of course, everything is in the base lexer:
INSERT INTO t1 (STR)
VALUES ('Abcd*ef');
BEGIN
CTX_DDL.DROP_PREFERENCE('SUBSTR_PREF');
CTX_DDL.DROP_PREFERENCE('pj_lex');
end;
drop INDEX IDX_T1_STR
CREATE INDEX IDX_T1_STR ON T1
(STR)
INDEXTYPE IS CTXSYS.CONTEXT
select *
from t1
where
contains (str,'abcd') > 0
STR
Abcd ef
Abcd
abcd
Abcd-ef
Abcd - ef
Abcd - 12
Abcd_ef12
Abcd*ef
But you don't do this with XYZ as a prefix and a wild card.
Tags: Database
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