anchor.diff:  select(Pid, {Schema, View, Filter, Opts}) ->
     select(Pid, Schema, View, Filter, Opts).
   
  +update(Pid, {Schema, Table, {Update, Condition}}) ->
  +  update(Pid, Schema, Table, Update, Condition).
  +
   function(Pid, {Schema, FunName, Params}) ->
     function(Pid, Schema, FunName, Params).
   
  
positive.code:   start_link/8,
    insert/2,
    select/2,
    function/2,
    execute/2
    ]).
  
negative.code:   Values = [Value | Vals],
    prepare_insert_data(T, Columns, Params, Values, N + 1).
  
  prepare_select_data(Data) ->
    prepare_select_data(Data, 1).
  
  prepare_select_data([], _N) ->
    {ok, [], []};
  prepare_select_data(Data, N) ->
    prepare_select_data(Data, [], [], N).
  
  prepare_select_data([], [32 | [$a | [$n | [$d | Condition]]]], Values, _N) ->
    {ok, " where" ++ Condition, lists:reverse(Values)};
  prepare_select_data([{Key, null} | T], Con, Vals, N) ->
    Condition = Con ++ " and " ++ atom_to_list(Key) ++ " is null",
    prepare_select_data(T, Condition, Vals, N);
  