[erlang-questions] gen_server and odbc problem about How to share a odbc connection

[wenew zhang]

i even don't know what's the "State" mean!
now i got!

Best Regards

Wenew Zhang


2008/3/28, Anthony Kong <anthony.hw.kong@REDACTED>:
> "State" is here for you to store per server state information.
>
>  So, you can
>
>
>  init([]) ->
>    process_flag(trap_exit, true),
>    io:format("Authserver init with []~n"),
>
>    {ok,Conn}=odbc:connect("DSN=flashpk;UID=flashpk;PWD=flashpk",[{trace_driver,on}]),
>
>    {ok, [Conn]}. %% keep the connection in the state
>
>
>  handle_info({?PLLOGIN,Uid,Pwd},State) ->
>
>    [Conn] = State, %% get the connection back from the state
>
>    io:format("PLLogin id:~w Uid:~w   Pwd:~w~n",[?PLLOGIN,Uid,Pwd]),
>    odbc:sql_query(Conn,"insert into customer(cno,password) values
>  ('root','123456')"),
>    {noreply, State}.
>
>
>
> Cheers, Anthony
>
>
>  On Fri, Mar 28, 2008 at 10:23 PM, wenew zhang <wenewboy@REDACTED> wrote:
>  > Dear All,
>  >       Maybe another low-level question,but it's make me confused,
>  >
>  >  init([]) ->
>  >     process_flag(trap_exit, true),
>  >     io:format("Authserver init with []~n"),
>  >  %    {ok,Bin}=file:consult(?AUTHCONF),
>  >  %    DDsn=element(2,lists:nth(1,Bin)),
>  >  %    Duser=element(2,lists:nth(2,Bin)),
>  >  %    Dpwd=element(2,lists:nth(3,Bin)),
>  >     %%Ddatabase=element(2,lists:nth(4,Bin)),
>  >  %    DSNString="DSN="++DDsn++";UID="++Duser++";PWD="++Dpwd,
>  >  %    {ok,Conn}=odbc:connect(DSNString,[{trace_driver,on}]),%% read the
>  >  odbc settings
>  >  {ok,Conn}=odbc:connect("DSN=flashpk;UID=flashpk;PWD=flashpk",[{trace_driver,on}]),
>  >     {ok,0}.
>  >
>  >  handle_info({?PLLOGIN,Uid,Pwd},_State) ->
>  >     io:format("PLLogin id:~w Uid:~w   Pwd:~w~n",[?PLLOGIN,Uid,Pwd]),
>  >     odbc:sql_query(Conn,"insert into customer(cno,password) values
>  >  ('root','123456')"),
>  >     {noreply, _State}.
>  >
>  >  i want share the Conn ,but i get the unbound error,
>  >  so How to share a odbc connection?
>  >  or anybody have other solutions?
>  >
>  >  Best Regards
>  >
>  >  wenew zhang
>
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>  >
>
>
>
>
> --
>  /*--*/
>  Don't EVER make the mistake that you can design something better than
>  what you get from ruthless massively parallel trial-and-error with a
>  feedback cycle. That's giving your intelligence _much_ too much
>  credit.
>
>  - Linus Torvalds
>