rs = db.querySelectAll("utilisateur","username='"+ txt_username.getText()
            + "' and password='"+ txt_password.getText() +"'");
    try {
    while (rs.next()){
    username1 = rs.getString("username");
    password1 = rs.getString("password");
    hak = rs.getString("type");
    }
     catch (SQLException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE,null,ex);
            }