public static String registrarUsuario(String user, String pass, String ci, int flag, int tipo) {
        return "INSERT INTO `usuario`(`user`,`pass`,`activo`,`ci`,`tipo`)VALUES('"
                + user + "','"
                + SQL.sha1(pass) + "','"
                + flag + "','"
                + ci + "','"
                + tipo + "');";
    }