public static Connection getInstance() throws Exception {
        if (connect == null) {
            try {
                url = mesParam.getParam("bddPath");
                user = mesParam.getParam("bddUser");
                passwd = mesParam.getParam("bddPass");
                connect = DriverManager.getConnection(url, user, passwd);
            } catch (SQLException e) {
                throw new Exception("impossible de se connceter à la base de données");
            }
        }
        return connect;
    }