-
-(*
- * gestione della connessione al database
- *)
-
-(*
- * le eccezzioni lanciate dalle funzioni init e pgc sono
- * definite nel modulo Mathql
- *)
-open Mathql;;
-
-(*
- * paramentri della connessione
- *)
-(*let connection_param = "host=127.0.0.1 dbname=helm";;*)
-let connection_param = "host=dotto.cs.unibo.it dbname=helm user=helm";;
-
-(*
- * connessione al db
- *)
-let conn = ref None;;
-
-(*
- * controllo sulla connessione
- *)
-let pgc () =
- match !conn with
- None -> raise (MQInvalidConnection connection_param)
- | Some c -> c
-;;
-
-(*
- * inizializzazione della connessione
+(* Copyright (C) 2000, HELM Team.
+ *
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ *
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * HELM 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 General Public License for more details.
*
- * TODO
- * passare i parametri della connessione come argomento di init
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * For details, see the HELM World-Wide-Web page,
+ * http://www.cs.unibo.it/helm/.
*)
-let init () =
- try (
- conn := Some (new Postgres.connection connection_param);
- ) with
- _ -> raise (MQConnectionFailed ("init: " ^ connection_param))
-;;
-(*
- * chiusura della connessione
- *)
-let close () =
- match !conn with
- None -> ()
+let init connection_param =
+ try Some (new Postgres.connection connection_param)
+ with _ -> None
+
+let close = function
+ | None -> ()
| Some c -> c#close
-;;
+