This commit was manufactured by cvs2svn to create branch 'init'.

[helm.git] / helm / ocaml / mathql_interpreter / dbconn.ml

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-(* 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.
- *
- * 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/.
- *)
-
-(*
- * gestione della connessione al database
- *)
-
-(*
- * le eccezioni lanciate dalle funzioni init e pgc sono
- * definite nel modulo Mathql 
- *)
-open MathQL;;
-
-exception InvalidURI of string
-exception ConnectionFailed of string
-exception InvalidConnection
-
-(*
- * connessione al db
- *)
-let conn = ref None
-
-(*
- * controllo sulla connessione
- *)
-let pgc () =
-   match !conn with
-      None   -> raise InvalidConnection
-    | Some c -> c
-;;
-
-(*
- * inizializzazione della connessione
- *
- * TODO
- * passare i parametri della connessione come argomento di init
- *)
-let init connection_param =
-   try (
-    conn := Some (new Postgres.connection connection_param);
-   ) with
-    _ -> raise (ConnectionFailed ("init: " ^ connection_param))
-;;
-
-(*
- * chiusura della connessione
- *)
-let close () =
-   match !conn with
-      None -> ()
-   |  Some c -> c#close
-;;