How can I combine the escaping of a search string and the specification of progression sequences within an oracle text query
so that in all cases the correct results are delivered (see example below)?
The scenario in which to use this is the following:
+ Database: Oracle Database 10g Enterprise Edition Release 10.2.0.2.0
+ Requirement: Hitlist of results ordered by score whereby the different part within
the result list are specified using progression sequences within oracle text query
Example:
create table service_provider (
id number,
name_c varchar(100),
uri_c varchar(255)
);
insert into service_provider values (1,'ABB Company Mgmt','http://www.abb-company-mgmt.de');
insert into service_provider values (2,'Dr. Abbas Ming','http://www.dr-abbas-ming.de');
insert into service_provider values (3,'SABBATA United','http://www.sabbata-united.de');
insert into service_provider values (4,'ABB','http://www.abb.de');
insert into service_provider values (5,'AND Company Mgmt','http://www.and-company-mgmt.de');
insert into service_provider values (6,'Dr. Andas Ming','http://www.dr-andas-ming.de');
insert into service_provider values (7,'SANDATA United','http://www.sandata-united.de');
insert into service_provider values (8,'AND','http://www.and.de');
Query 1: works correctly in this case
select * from (
select /*+ FIRST_ROWS */ score(1), this_.*
from service_provider this_
where
CONTAINS ( this_.NAME_C , '<QUERY><textquery grammar="CONTEXT">' ||
'<progression>' ||
'<seq>abb</seq>' ||
'<seq>abb%</seq>' ||
'<seq>%abb%</seq>' ||
'<seq>fuzzy(abb,1,100,WEIGHT)</seq>' ||
'</progression></textquery></QUERY>', 1 ) > 0
order by score(1) desc, this_.NAME_C
) where rownum < 21
delivers
76 4 ABB http://www.abb.de
76 1 ABB Company Mgmt http://www.abb-company-mgmt.de
51 2 Dr. Abbas Ming http://www.dr-abbas-ming.de
26 3 SABBATA United http://www.sabbata-united.de
Query 2: procudes error
select * from (
select /*+ FIRST_ROWS */ score(1), this_.*
from service_provider this_
where
CONTAINS ( this_.NAME_C , '<QUERY><textquery grammar="CONTEXT">' ||
'<progression>' ||
'<seq>and</seq>' ||
'<seq>and%</seq>' ||
'<seq>%and%</seq>' ||
'<seq>fuzzy(and,1,100,WEIGHT)</seq>' ||
'</progression></textquery></QUERY>', 1 ) > 0
order by score(1) desc, this_.NAME_C
) where rownum < 21
produces ORA-29902, ORA-20000, DRG-50901 because AND is a reserved word in oracle text
So we need escaping ...
Query 3: does not work correctly
select * from (
select /*+ FIRST_ROWS */ score(1), this_.*
from service_provider this_
where
CONTAINS ( this_.NAME_C , '<QUERY><textquery grammar="CONTEXT">' ||
'<progression>' ||
'<seq>{abb}</seq>' ||
'<seq>{abb%}</seq>' ||
'<seq>{%abb%}</seq>' ||
'<seq>fuzzy({abb},1,100,WEIGHT)</seq>' ||
'</progression></textquery></QUERY>', 1 ) > 0
order by score(1) desc, this_.NAME_C
) where rownum < 21
delivers
76 4 ABB http://www.abb.de
76 1 ABB Company Mgmt http://www.abb-company-mgmt.de
Query 4: does not produce an error, but also does not work correctly
select * from (
select /*+ FIRST_ROWS */ score(1), this_.*
from service_provider this_
where
CONTAINS ( this_.NAME_C , '<QUERY><textquery grammar="CONTEXT">' ||
'<progression>' ||
'<seq>{and}</seq>' ||
'<seq>{and%}</seq>' ||
'<seq>{%and%}</seq>' ||
'<seq>fuzzy({and},1,100,WEIGHT)</seq>' ||
'</progression></textquery></QUERY>', 1 ) > 0
order by score(1) desc, this_.NAME_C
) where rownum < 21
delivers
76 8 AND http://www.and.de
76 5 AND Company Mgmt http://www.and-company-mgmt.de