1 (* Copyright (C) 2000, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
26 (* AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
29 type flag = Postgres | Galax | Stat | Quiet | Warn | Log
32 log : string -> unit; (* logging function *)
33 set : flag list; (* options *)
34 pgc : Postgres.connection option; (* PG connection *)
35 pgm : MQIMap.pg_map; (* PG conversion function *)
36 pga : MQIMap.pg_alias (* PG table aliases *)
39 let tables handle p = MQIMap.get_tables handle.pgm p
41 let field handle p t = MQIMap.get_field handle.pgm p t
43 let resolve handle a = MQIMap.resolve handle.pga a
45 let log handle = handle.log
47 let set handle flag = List.mem flag handle.set
49 let pgc handle = handle.pgc
51 let flags handle = handle.set
53 let string_of_flag = function
61 let flag_of_char = function
70 let string_fold_left f a s =
71 let l = String.length s in
72 let rec aux b i = if i = l then b else aux (f b s.[i]) (succ i) in
75 let string_of_flags flags =
76 List.fold_left (fun s flag -> s ^ string_of_flag flag) "" flags
78 let flags_of_string s =
79 string_fold_left (fun l c -> l @ flag_of_char c) [] s
81 let init myflags mylog =
84 if List.mem Galax myflags
85 then MQIMap.empty_map else MQIMap.read_map
88 {log = mylog; set = myflags;
89 pgc = if List.mem Galax myflags then None else MQIPostgres.init s;
94 if set handle Galax then () else MQIPostgres.close handle.pgc
96 let connected handle =
97 if set handle Galax then false else (pgc handle) <> None
99 let init_if_connected myflags mylog =
100 let handle = init myflags mylog in
101 ignore (pgc handle); handle