$sth->execute;
     my @cols = ( );
     @cols[0..2] = ( );
     $sth->bind_columns( undef, \(@cols) );
     while ( $sth->fetch ) {
       my $o = Forum::Post->new([ @cols[0..2] ]);
       push( @{ $children{ $o->pid } }, $o->id ) and $obj{ $o->id } = $o; 
     }