anchor.diff:          {value, {_, <<"on">>}}  -> put(datetime_mod, pgsql_idatetime);
           {value, {_, <<"off">>}} -> put(datetime_mod, pgsql_fdatetime)
       end,
  -    notify(State, ok),
  +    notify(State, done),
       {noreply, State#state{handler = on_message,
                            txstatus = Status,
                            queue = queue:drop(Queue)}};
  
positive.code: send(#state{mod = Mod, sock = Sock}, Type, Data) ->
      Mod:send(Sock, pgsql_wire:encode(Type, Data)).
  
  notify(#state{queue = Q} = State, Message) ->
      {{From, Ref}, _} = queue:get(Q),
      From ! {Ref, Message}.
  
  
negative.code: init([]) ->
      {ok, #state{}}.
  
  handle_call({get_parameter, Name}, _From, State) ->
      case lists:keysearch(Name, 1, State#state.parameters) of
          {value, {Name, Value}} -> Value;
          false                  -> Value = undefined
  