about libpq-C FETCH ALL performance issue

Hello,

I'm working on a project where libpq-C is envolved. We
have several background processes keep querying
certain data from database and send them out as ip
packets. With libpq-C interface, I have to use

res = PQexec(conn, "DECLARE myportal CURSOR FOR select
* from pg_database");

and then res = PQexec(conn, "FETCH ALL in myportal");

to get the data.

I found when our database has more and more data, res
= PQexec(conn, "FETCH ALL in myportal"); cost more and
more time, much more than

res = PQexec(conn, "DECLARE myportal CURSOR FOR select
* from pg_database");

and make our sending packet rate extremely low. We get
into big problems here.

I wonder if there is other faster way ( I mean other
than FETCH ALL command) to get data from database with
libpq-C, or If you have a patch to fix this problem.

Hope to hear from you soon.

Best Regards

jing

__________________________________
Do you Yahoo!?
Check out the new Yahoo! Front Page.
www.yahoo.com