DB interface problem

I started having trouble with a DBI interface to my PostgreSQL database after I built a new Ubuntu machine. The Postgres version is 8.3 and the DBI was written several years ago (by someone else). I'm using PHP version 5.2.6-3ubuntu4.2 with apache2. The problem is that I get the error: Warning: pg_num_rows(): supplied argument is not a valid PostgreSQL result resource in /var/www/lib/dbi_pgsql.php on line 202 I don't know what to check next to figure out why this is happening. Here is what I have done so far: - Updated the old PHP commands in the dbi file to reflect new ones var -> public pg_numrows -> pg_num_rows pg_cmdtuples -> pg_affected_rows pg_exec -> pg_execute - Connected to the database as the same user by using straight PHP calls vs the DBI. It worked fine. - Connected to the database via psql and that worked fine, too. There is something with the DBI class that is not right, but I am a novice with objects and classes, so I can't pin it down. The whole file is here: http://www.sv-phoenix.com/dbi_pgsql.php - it's 205 lines so I didn't want to put the whole thing in this post. If anyone can take a look at it and let me know what to check next, I would really appreciate it. Giff