return 1 if(defined(%{$reverse_chardb{$atr}}));
if(defined($reverse_db{$atr}) and -f $reverse_db{$atr}){
tie %{$reverse_chardb{$atr}}, "BerkeleyDB::Hash",
return 1 if(defined(%{$reverse_chardb{$atr}}));
if(defined($reverse_db{$atr}) and -f $reverse_db{$atr}){
tie %{$reverse_chardb{$atr}}, "BerkeleyDB::Hash",