Problems with multiple query

Hi, I've recently migrated a system with PHP 4.0.3pl1 and PostgreSQL 7.0.2 - RedHat Linux 5.1 (yes 5) to a new one with PHP 4.0.4pl1 - PostgreSQL 7.0.2 - RedHat Linux 7.0. All my database applications work fine except one which does strange things: this is a piece of code: ----8<------- CUT ---- $conn = pg_connect("dbname=aaaa user=yyyyy password=xxxxxx"); $sql = "select * from table_a where condition_a"; $qry1 = pg_exec ($conn,$sql); $obj1 = pg_fetchobject($qry1,0); // Until here everything works fine $sql2 = "select * from table_b where condition_b=".$obj1->value_a; $qry2 = pg_exec ($conn,$sql2); ----8<------- CUT ---- The second query is nested in a for-loop running for every object in the first query; for performance reason I need to maintain the two queries independent. After executing (correctly) the first one, the system starts doing strange things with the second one: Warning: Unable to jump to row 0 on PostgreSQL result index 23 in cerca.php3 on line 467 and it fails to read data. The strange thing is that the system does the same things for EVERY database where I must use two consecutive queries ! Is there anyone who can help me ? Thanks in advance Luca Lazzeroni