+my %hash = ();
+$hash{'disabled'} = '' unless $opt{'showdisabled'};
+
+if ( exists($opt{'classnum'}) && defined($opt{'classnum'}) ) {
+ if ( $opt{'classnum'} > 0 ) {
+ $hash{'classnum'} = $opt{'classnum'};
+ } elsif ( $opt{'classnum'} eq '' || $opt{'classnum'} == 0 ) {
+ $hash{'classnum'} = '';
+ } #else -1 or not specified, all classes, so don't set classnum
+}
+
+$opt{'extra_sql'} .= ( keys(%hash) ? ' AND ' : ' WHERE ' ).
+ FS::part_pkg->curuser_pkgs_sql;