使用系统游标返回数据集

create or replace function f_user_qr_qrycalloutuser
(
  i_in_querytype    in   number,
  str_o_result      out  varchar2
)
return sys_refcursor is
  cur_result sys_refcursor;
begin
  str_o_result := '00000000';
  open cur_result for select t.configname, t.configname, t.configtype, t.configvalue, t.configname, t.configtype from usdpc45_zxy.t_config@HPC2 t;
  
  exception
        when others then
    open cur_result for select 'x' from dual where 1 = 0;
    return cur_result;
end f_user_qr_qrycalloutuser;
/