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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 *)
(*********************************************************************************)
(** *)
(** The software name *)
let logiciel = "OCamlODBC"
(** The software version *)
let version = "2.10"
exception SQL_Error of string
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)
else
()
(** Cette fonction prive 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 connection ?(get_info=false) ?(n_rec=1) req callback =
if req = "" then
(-1, ([] : (string * sql_column_type) list))
else
(
let phEnv = connection.phEnv in
let phDbc = connection.phDbc in
let (ret, env) = SQLInterface.execDB phEnv phDbc req in
match ret with
0 ->
let l_desc_col =
if get_info then
(* rcuprer les informations sur les champs retourns
(nom et type) par la dernire requte excute *)
SQLInterface.get_infoDB env phEnv phDbc
else
[]
in
(* rcuprer les records en plusieurs fois *)
(
let rec iter () =
let (n, ll_res) = SQLInterface.itereDB env n_rec in
(*Gc.minor();*)
let no_more = n < n_rec in
(
callback ll_res;
if no_more
then ()
else iter ()
)
in
let _ = iter () in
let _ = SQLInterface.free_execDB env in
(ret, l_desc_col)
)
| 1 ->
(* pas de colonne, donc pas d'enregistrements rcuprer *)
let _ = SQLInterface.free_execDB env in
(0, [])
| _ ->
let _ = SQLInterface.free_execDB env in
(ret, [])
)
let execute_fetchall connection get_info req =
let res = ref [] in
let step = 40 in
let callback ll = res := (!res) @ ll in
let (code, info) =
execute_gen connection ~get_info:get_info ~n_rec:step req callback
in
(code, info, !res)
let execute connection req =
let (c, _, l) = execute_fetchall connection false req in
(c, l)
let execute_with_info connection req =
execute_fetchall connection 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 list list -> unit) =
execute_gen connection ~get_info:get_info ~n_rec:n_rec req callback
end
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