返回数据集为空

create or replace procedure salestables
(v_year in varchar2,
info_cursor out testpackage.info_cursor--,
--status_cursor out testpackage.status_cursor
) is
v_d varchar(50);
v_sa varchar(50);
v_pri number;
v_sql varchar2(3000);
--v_sql_status varchar2(1000);

begin
   v_sql:='select d_date,count(d_date)sa,sum(price) pri from (select t.订单ID did,substr(t.订购日期,1,7) d_date,t.是否已付 status,d.单价*数量 price,d.折扣 perc from 订单 t
   left join
   订单明细 d on t.订单id=d.订单id) tt where d_date like :v_year
   group by d_date
   order by d_date';
   open info_cursor for v_sql using v_year ||'%';
   --execute immediate v_sql;
   /* fetch info_cursor into v_d,v_sa,v_pri;
   while info_cursor%found loop
      dbms_output.put_line(v_d||'  '||v_sa||'  '||v_pri);
   fetch info_cursor into v_d,v_sa,v_pri;
   end loop;
   */
end salestables;
我写了如上过程
按道理说应该能返回数据集啊,但是为什么返回数据集为空呢?