Re: [Caml-list] pgocaml and lwt

["Pierre Chopin" <pierre.chopin@u-psud.fr>]

It was indeed the problem.

Thanks !

Le Dim 30 septembre 2012 15:31, Sebastien Mondet a écrit :
> Hi
>
>
> If I remember correctly, the syntax extension will use the module called
> PGOCaml which is "in scope", so you need to hide the "preemtive threads"
> one with yours:
>
> module PGOCaml = PGOCaml_generic.Make(Thread)
>
>
> Cheers
> Seb
>
>
>
> On Sun, Sep 30, 2012 at 6:04 PM, Pierre Chopin
> <pierre.chopin@u-psud.fr>wrote:
>
>
>> Hi,
>> I am trying to use pgocaml and lwt, but I have some error I can't
>> understand:
>>
>>
>> (**********************************************)
>> (**********************************************)
>>
>>
>>
>> module Thread = struct open Lwt open Lwt_io type 'a t = 'a Lwt.t let
(>>=) =
>> (>>=)
>> let return = return let fail = fail type in_channel = input_channel type
>> out_channel = output_channel let open_connection addr = open_connection
>> ~buffer_size:2097152 addr
>> let output_char = write_char let  output_binary_int =  write_int let
>> output_string  = write let flush = flush let input_char = read_char let
>> input_binary_int = read_int let really_input =read_into_exactly let
>> close_in = close end
>>
>>
>> module Lwt_db = PGOCaml_generic.Make(Thread) open Lwt_db
>>
>> open Lwt
>>
>> let query_user dbh id = PGSQL(dbh) "SELECT id,name,visited FROM user_db
>> WHERE id=$id"
>>
>>
>> let _ = Lwt_main.run
>> (connect ~database:"schat" ()>|=
>> function dbh -> query_user dbh 1L)
>>
>> (**********************************************)
>> (**********************************************)
>>
>>
>> when I try to compile :
>>
>>
>> $ ocamlfind ocamlc -thread -c -package lwt,pgocaml,pgocaml.syntax
>> -syntax
>> camlp4o test.ml
>>
>> File "test.ml", line 34, characters 30-33:
>> Error: This expression has type
>> 'a Lwt_db.t = 'a PGOCaml_generic.Make(Thread).t
>> but an expression was expected of type (string, bool) Hashtbl.t PGOCaml.t
>>
>>
>>
>>
>>
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>
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