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(*****************************************************************************)
(* OCamlODBC *)
(* *)
(* Copyright (C) 2004 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. *)
(* *)
(* This program is free software; you can redistribute it and/or modify *)
(* it under the terms of the GNU Lesser General Public License as published *)
(* by the Free Software Foundation; either version 2.1 of the License, or *)
(* any later version. *)
(* *)
(* This program is distributed in the hope that it will be useful, *)
(* but WITHOUT ANY WARRANTY; without even the implied warranty of *)
(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *)
(* GNU Lesser General Public License for more details. *)
(* *)
(* You should have received a copy of the GNU Lesser General Public License *)
(* along with this program; if not, write to the Free Software *)
(* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA *)
(* 02111-1307 USA *)
(* *)
(* Contact: Maxence.Guesdon@inria.fr *)
(*****************************************************************************)
(* $Id: ocamlodbc.ml,v 1.18 2007/06/20 18:28:35 chris Exp $ *)
(** The software name *)
let logiciel = "OCamlODBC"
(** The software version *)
let version = "2.15"
exception SQL_Error of string
(* BEWARE: Keep constructor in the right order w.r.t. OCAML_SQL_*
constants in ocaml_odbc_c.c *)
type sql_column_type =
| SQL_unknown
| SQL_char
| SQL_numeric
| SQL_decimal
| SQL_integer
| SQL_smallint
| SQL_float
| SQL_real
| SQL_double
| SQL_varchar
| SQL_date
| SQL_time
| SQL_timestamp
| SQL_longvarchar
| SQL_binary
| SQL_varbinary
| SQL_longvarbinary
| SQL_bigint
| SQL_tinyint
| SQL_bit
(** The module for the column type and its conversion into a string. *)
module SQL_column =
struct
type t = sql_column_type
let string col_type =
match col_type with
| SQL_unknown -> "SQL_unknown"
| SQL_char -> "SQL_char"
| SQL_numeric -> "SQL_numeric"
| SQL_decimal -> "SQL_decimal"
| SQL_integer -> "SQL_integer"
| SQL_smallint -> "SQL_smallint"
| SQL_float -> "SQL_float"
| SQL_real -> "SQL_real"
| SQL_double -> "SQL_double"
| SQL_varchar -> "SQL_varchar"
| SQL_date -> "SQL_date"
| SQL_time -> "SQL_time"
| SQL_timestamp -> "SQL_timestamp"
| SQL_longvarchar -> "SQL_longvarchar"
| SQL_binary -> "SQL_binary"
| SQL_varbinary -> "SQL_varbinary"
| SQL_longvarbinary -> "SQL_longvarbinary"
| SQL_bigint -> "SQL_bigint"
| SQL_tinyint -> "SQL_tinyint"
| SQL_bit -> "SQL_bit"
end
module SQLInterface = Ocaml_odbc.Interface(SQL_column)
module OCamlODBC_messages =
struct
let disconnect = "ODBC : problem while disconnecting"
let connection nom_base nom_user pzPasswd iRC1 =
"Error while connecting to database " ^ nom_base ^ " as "
^ nom_user ^ " with password <" ^ pzPasswd ^ "> : "
^ (string_of_int iRC1)
let connection_driver connect_string iRC1 =
"Error while connecting to database with connection string "
^ connect_string ^ "> : " ^ (string_of_int iRC1)
end
type connection = {
phEnv : Ocaml_odbc.sQLHENV ;
phDbc : Ocaml_odbc.sQLHDBC ;
base : string ;
user : string ;
passwd : string ;
}
let connect base user passwd =
let (iRC1,hEnv,pHDbc) = SQLInterface.initDB base user passwd in
if iRC1 = 0 then
{
phEnv = hEnv;
phDbc = pHDbc;
base = base ;
user = user ;
passwd = passwd ;
}
else
raise (SQL_Error (OCamlODBC_messages.connection base user passwd iRC1))
let connect_driver ?(prompt=false) connect_string =
let (iRC1,hEnv,pHDbc) = SQLInterface.initDB_driver connect_string prompt in
if iRC1 = 0 then
{
phEnv = hEnv;
phDbc = pHDbc;
base = connect_string ;
user = "" ;
passwd = "" ;
}
else
raise (SQL_Error (OCamlODBC_messages.connection_driver connect_string iRC1))
let disconnect connection =
let iRC = SQLInterface.exitDB connection.phEnv connection.phDbc in
if iRC <> 0 then raise(SQL_Error OCamlODBC_messages.disconnect)
(** Cette fonction excute une requte interrompue par des appels
rguliers au GC. Elle retourne un triplet : code d'erreur (0 si
ok), liste de couples (nom, type) pour dcrire les colonnes
retournes, liste de liste de chaines reprsentant les
enregistrements.
*)
let execute_gen conn ?(get_info=false) ?(n_rec=40) req callback =
if req = "" then
(-1, ([] : (string * sql_column_type) list))
else (
let (ret, env) = SQLInterface.execDB conn.phEnv conn.phDbc req in
match ret with
| 0 ->
let l_desc_col =
if get_info then SQLInterface.get_infoDB env
(* rcuprer les informations sur les champs retourns
(nom et type) par la dernire requte excute *)
else [] in
(* rcuprer les records en plusieurs fois *)
let rec iter () =
let (n, ll_res) = SQLInterface.itereDB env n_rec in
(*Gc.minor();*)
callback ll_res;
if n >= n_rec (* maybe more rows *) then iter() in
iter();
SQLInterface.free_execDB env;
(ret, l_desc_col)
| 1 ->
(* pas de colonne, donc pas d'enregistrements rcuprer *)
SQLInterface.free_execDB env;
(0, [])
| _ ->
SQLInterface.free_execDB env;
(ret, [])
)
let execute_fetchall conn get_info req =
let res = ref [] in
let callback ll = res := !res @ ll in
let (code, info) = execute_gen conn ~get_info:get_info req callback in
(code, info, !res)
let execute conn req =
let (c, _, l) = execute_fetchall conn false req in
(c, l)
let execute_with_info conn req =
execute_fetchall conn true req
(** Object-oriented interface. *)
(**
@param base the database to connect to
@param user the user to use when connecting
@param passwd the password to use when connecting, can be [""]
*)
class data_base base user passwd =
object (self)
(** The connection, initialized when the object is created. *)
val connection = connect base user passwd
(** The flag to indicates whether we are connected or not,
used not to disconnect more than once.*)
val mutable connected = true
method connect () = ()
method disconnect () =
if connected then (
connected <- false;
disconnect connection
)
method execute req = execute connection req
method execute_with_info req = execute_with_info connection req
method execute_gen ?(get_info=false) ?(n_rec=1) req
(callback : string option list list -> unit) =
execute_gen connection ~get_info:get_info ~n_rec:n_rec req callback
end
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