| From: | Michael Fuhr <mike(at)fuhr(dot)org> |
|---|---|
| To: | Doug Homoelle <homoelle(at)ll(dot)mit(dot)edu> |
| Cc: | pgsql-interfaces(at)postgresql(dot)org |
| Subject: | Re: newbie libpq question... |
| Date: | 2004-11-14 01:23:41 |
| Message-ID: | 20041114012339.GA73251@winnie.fuhr.org |
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| Thread: | |
| Lists: | pgsql-interfaces |
On Mon, Nov 08, 2004 at 05:23:59PM -0500, Doug Homoelle wrote:
>
> 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.
You're using floating-point (%f) conversions to print integers; use
%d or %i instead. Some compilers have options to warn you of such
mistakes -- with gcc, for example, you can use -Wall.
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
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