I am working on a GPL version of a boolean text search engine for
PostgreSQL.
How it works:
You run a program which executes a query and builds a set of external
indexes.
Then you run a daemon process which does the processing of the text
query.
In postgres, you create a temporary table of results, call textsearch
which populates the table,
lastly, you join with the results table. The code looks like this:
>>>>>>>>>>>>>
--
-- Create a temporary table for search results
--
create temp table search_result (key integer, rank integer);
--
-- Call search daemon to populate table
--
select textsearch('performer2{ waitresses } song { i know what boys like
}');
--
-- Join result table with data tables
--
select title, song, performer2, rank from zsong, ztitles, search_result
where search_result.key = zsong.trackid and
zsong.muzenbr = ztitles.muzenbr
order by search_result.rank desc;
--
-- Finished with result table, drop it.
--
drop table search_result ;
<<<<<<<<<<<<<<<<
he textsearch function looks like:
>>>>>>>>>>>>>>>>>>>>>>>>
create function textsearch(varchar) returns integer as
'
DECLARE
handle integer;
count integer;
pos integer;
BEGIN
handle = search_exec( \'localhost\', $1);
count = search_count(handle);
for pos in 0 .. count-1 loop
insert into search_result(key, rank)
values (search_key(handle,pos),
search_rank(handle,pos));
end loop;
return search_done(handle);
END;
' language 'plpgsql';
What I would like to do is create the result table in the function
and/or accept a table name as a parameter. I can't seem to do this,
perhaps I am missing something trivial.
Is there a way to create a table from within 'c' and return it? I am
not a postgres pro, I am a C/C++ guy and do not know the ins and outs of
Postgres, and it should be a lot easier to make something more eficient.
Any insign would be appreciated.
