exception

create or replace procedure Test_update(xh_in     xsxxgl_xsjbxx_test.xh%type,
                                        add_count in number) is
  min_count constant number := 0;
  max_count constant number := 2;
  invalid_discount exception;
begin
  if add_count between min_count and max_count then
    update xsxxgl_xsjbxx_test set sfzjh = sfzjh||'cs' WHERE xh = xh_in;
    commit;
    if sql%rowcount = 0 then
      raise no_data_found;
    end if;
  else
    raise invalid_discount;
  end if;
exception
  when invalid_discount then
    dbms_output.put_line('the specified discount is invalid.');
  when no_data_found then
    dbms_output.put_line('No orders in the system for test xh:' ||
                         to_char(xh_in));

end Test_update;

 结果貌似有点问题