if($Hydra_db->Sql("SELECT * FROM $qry")){
    print "SQL Error: ".$Hydra_db.Error()."\n";
}

##</code><code>##

if($Hydra_db->Sql("SELECT * FROM $qry")){
    print "SQL Error: ".$Hydra_db.Error()."\n";
}else{
    # keep retrieving rows until nothing is left
    while($Hydra_db->FetchRow()){
        # pull one record into a variable for use       
        @groupapps = $Hydra_db->Data(); 
        print @groupapps,"\n";
    }
}