private Set<Usager> loadDB() {
        Set<Usager> lu = new HashSet<Usager>();
        try {
            String req = "SELECT * FROM USAGER";
            Statement statement = DB.getConnexion().createStatement();
            ResultSet rs = statement.executeQuery(req);

            while (rs.next()) {
                Usager u = new Usager(Integer.parseInt(rs.getString("ID_USAGER")), rs.getString("NOM"), rs.getString("PRENOM"));
                lu.add(u);
            }
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(Usager.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            Logger.getLogger(Usager.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(Usager.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SQLException ex) {
            Logger.getLogger(Usager.class.getName()).log(Level.SEVERE, null, ex);
        }
        return lu;
    }