Subject: newbie libpq question...
From: Doug Homoelle <homoelle@ll.mit.edu>
To: pgsql-interfaces@postgresql.org
Content-Type: text/plain
Message-Id: <1099952639.2819.8.camel@             >
Mime-Version: 1.0
Date: Mon, 08 Nov 2004 17:23:59 -0500
Content-Transfer-Encoding: 7bit

I'm trying to use the libpq library for the first time and I'm
experiencing what seems to be a very basic problem.  When I run the
following:

	res = PQexec(conn, "select blah blah blah");
	test_int=PQntuples(res);
	fprintf(stdout,"number of rows: %f\n",test_int);
	test_int=PQnfields(res);
	fprintf(stdout,"number of cols: %f\n",test_int);

where "blah blah blah" is the selection criteria, I get zero rows and
zero columns.  When I do the exact same "select" query through the psql
interface I get 547 rows and 3 columns.  I've checked that
PQresultStatus = PGRES_TUPLES_OK, so it seems like it completed the
command correctly.  I'm new to postgres and I haven't used C in a long
while so I'm a little rusty there.  Am I missing something obvious?

thanks in advance for any insight,
dh