incognito mode - Page 406

Using native MySQL driver in Erlang

- by Mickey Shine

I am using native MySQL driver (http://code.google.com/p/erlang-mysql-driver/) with mochiweb. When I tried that MySQL driver in shell mode, all woked fine. But when I write some code with Mochiweb, it reported me the following error: =CRASH REPORT==== 4-Jul-2009::04:44:29 === crasher: initial call: mochiweb_socket_server:acceptor_loop/1 pid: <0.61.0> registered_name: [] exception error: no function clause matching mysql:fetch(p1,<<"SELECT * FROM cdb_forums LIMIT 10">>) in function perly_web:loop/2 in call from mochiweb_http:headers/5 ancestors: [perly_web,perly_sup,<0.58.0>] messages: [] links: [<0.60.0>,#Port<0.965>] dictionary: [{mochiweb_request_body,undefined}, {mochiweb_request_qs,[]}, {mochiweb_request_post,[]}, {mochiweb_request_path,"/online"}, {mochiweb_request_cookie, [{"04c_sid","hG9Oyv"}, {"04c_visitedfid","2"}, {"kQx_cookietime","2592000"}, {"kQx_loginuser","admin"}, {"kQx_activationauth", "98b3mdX86fKT9dI4WyKuL61Tqxk%2BW1r6ACpHp9y8itH2xQ"}, {"smile","1D1"}]}] trap_exit: false status: running heap_size: 1597 stack_size: 24 reductions: 5188 neighbours: The code I write in Mochiweb is start(Options) -> {DocRoot, Options1} = get_option(docroot, Options), Loop = fun (Req) -> ?MODULE:loop(Req, DocRoot) end, % we’ll set our maximum to 1 million connections. (default: 2048) mochiweb_http:start([{max, 1000000}, {name, ?MODULE}, {loop, Loop} | Options1]), mysql:start_link(p1, "10.0.0.123", "root", "root", "test"). stop() -> mochiweb_http:stop(?MODULE). loop(Req, DocRoot) -> "/" ++ Path = Req:get(path), case Req:get(method) of Method when Method =:= 'GET'; Method =:= 'HEAD' -> case Path of "online" -> Result1 = mysql:fetch(p1, <<"SELECT * FROM cdb_forums LIMIT 10">>), Body1 = io:format("Result1: ~p~n", [Result1]), Req:ok({"text/plain", Body1}); The connection looks good but when I added Result1 = mysql:fetch(p1, <<"SELECT * FROM cdb_forums LIMIT 10">>), it crashed. Can someone help me? Thanks in advance~ //================================================== updated: I noticed the follwoing information. If that is correct? =PROGRESS REPORT==== 4-Jul-2009::05:49:32 === supervisor: {local,kernel_safe_sup} started: [{pid,<0.65.0>}, {name,inet_gethost_native_sup}, {mfa,{inet_gethost_native,start_link,[]}}, {restart_type,temporary}, {shutdown,1000}, {child_type,worker}] mysql_conn: greeting version "5.1.33-log" (protocol 10) salt "ne0_m'vA" caps 63487 serverchar <<8,2,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0>> salt2 "!|o;vabJ*4bt" mysql_auth send packet 1: <<5,162,0,0,64,66,15,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,114,111,111,116,0,20,52,235,78, 173,36,251,201,242,172,139,113,231,253,181,245,3, 91,198,111,135>> Link: {ok,<0.62.0>} =SUPERVISOR REPORT==== 4-Jul-2009::05:49:32 === Supervisor: {local,perly_sup} Context: start_error Reason: ok Offender: [{pid,undefined}, {name,perly_web}, {mfa, {perly_web,start, [[{ip,"0.0.0.0"}, {port,8000}, {docroot, "/work/mochiweb-read-only/scripts/perly/priv/www"}]]}}, {restart_type,permanent}, {shutdown,5000}, {child_type,worker}]

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