Skip site navigation (1) Skip section navigation (2)

newbie libpq question...

From: Doug Homoelle <homoelle(at)ll(dot)mit(dot)edu>
To: pgsql-interfaces(at)postgresql(dot)org
Subject: newbie libpq question...
Date: 2004-11-08 22:23:59
Message-ID: 1099952639.2819.8.camel@ (view raw or flat)
Thread:
Lists: pgsql-interfaces
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


Responses

pgsql-interfaces by date

Next:From: Doug HomoelleDate: 2004-11-08 22:36:09
Subject: newbie libpq question...
Previous:From: Cal McPhersonDate: 2004-11-08 04:54:44
Subject: libpqxx not compiling against native windows postresql install

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group