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://www.cs.unibo.it/helm/.
27 * gestione della connessione al database
31 * le eccezioni lanciate dalle funzioni init e pgc sono
32 * definite nel modulo Mathql
37 * paramentri della connessione
39 * TODO: bisogna scegliere se questi parametri vengono
40 * passati come argomento
42 (*let connection_param = "dbname=helm";;*)
43 let connection_param = "host=dotto.cs.unibo.it dbname=helm user=helm";;
51 * controllo sulla connessione
55 None -> raise (MQInvalidConnection connection_param)
60 * inizializzazione della connessione
63 * passare i parametri della connessione come argomento di init
67 conn := Some (new Postgres.connection connection_param);
69 _ -> raise (MQConnectionFailed ("init: " ^ connection_param))
73 * chiusura della connessione