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% The clientdatabase
-module(cldb).
-export([init/0]).
-record(user, {name, passwd, votes, rights}).
init() ->
mnesia:create_schema([node()]),
mnesia:start(),
mnesia:create_table(user, [{attributes, record_info(fields, user)}]),
io:format("Userdb up and running \n").
ask(User, Pwd) ->
F = fun() ->
mnesia:match_object({user, User, Pwd, '_'})
end,
mnesia:transaction(F).
login(User, Pwd) ->
{_, Reason} = ask(User, Pwd),
Reason.
register(User, Pwd, Root) ->
F = fun() ->
mnesia:write(#user{name = User, passwd = Pwd, votes = 5, rights = Root})
end,
{_, Reason} = mnesia:transaction(F),
Reason.
decVote(User, Pwd) ->
F = fun() ->
[Head|_] = ask(User, Pwd),
Votes = Head#user.votes - 1,
New = Head#user{votes = Votes},
mnesia:write(New)
end,
mnesia:transaction(F).
incVote(User, Pwd) ->
F = fun() ->
[Head|_] = ask(User, Pwd),
Votes = Head#user.votes + 1,
New = Head#user{votes = Votes},
mnesia:write(New)
end,
mnesia:transaction(F).
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