一个直译的方法就是用游标来做，不过也可以把结果集放到数组里面或者一个大的临时表或者是XML等的格式来输出。
比如在MySQL里面可以这样简单的写一个存储过程。
delimiter || create procedure sp_get_multiple_set1() begin select * from j1 limit 20; select * from tmp_2 limit 20; end; || delimiter ; 执行下会得到两个结果集。 t_girl--call sp_get_multiple_set1(); +------+------+ | id | str1 | +------+------+ | 1 | love | | 2 | hate | +------+------+ 2 rows in set (0.00 sec) +------+---------------+ | id | register_date | +------+---------------+ | 1 | 2014-01-18 | | 2 | 2014-01-03 | | 3 | 2014-01-16 | +------+---------------+ 3 rows in set (0.00 sec) Query OK, 0 rows affected (0.00 sec) t_girl--
在PostgreSQL环境下，来看下下面的函数代码，只能用游标来实现，而且还不能在函数里面返回。
create or replace function sp_get_multiple_set1(
IN f_id int,
refcursor,
refcursor
) returns setof refcursor
as
$ytt$
declare r1 alias for $2;
r2 alias for $3;
begin
open r1 for select * from j1 where id =f_id;
return next r1;
open r2 for select * from tmp_2 where id = f_id;
return next r2;
end;
$ytt$ language plpgsql;
接下来，在一个事务里面来获取对应的游标结果集。
t_girl=# begin; BEGIN t_girl=# select * from sp_get_multiple_set1(1,‘a‘::refcursor,‘b‘::refcursor); sp_get_multiple_set1 ---------------------- a b (2 rows) t_girl=# fetch all from a; id | str1 ----+------ 1 | love (1 row) t_girl=# fetch all from b; id | register_date ----+--------------- 1 | 2013-01-20 (1 row) t_girl=# close a; CLOSE CURSOR t_girl=# close b; CLOSE CURSOR t_girl=# commit; COMMIT t_girl=#
如果是是多个结果集，但是每个结果集里面只有一行数据的话，也可以用OUT参数来实现。
create or replace function sp_get_single_set2(
f_id int,
IN refcursor,
IN refcursor,
OUT r3 ytt_j1,
OUT r4 ytt_tmp_2
) returns record
as
$ytt$
declare r1 alias for $2;
r2 alias for $3;
begin
open r1 for select * from j1 where id =f_id;
open r2 for select * from tmp_2 where id = f_id;
loop
fetch r1 into r3;
fetch r2 into r4;
exit when not found;
return;
end loop;
close r1;
close r2;
end;
$ytt$ language plpgsql;
t_girl=# select * from sp_get_multiple_set2(1,‘a‘::refcursor,‘b‘::refcursor);
r3 | r4
----------+----------------
(1,love) | (1,2013-01-20)
(1 row)
t_girl=#
如果返回的多个结果集的字段和类型都一致的话，那就跟单个结果集一样了。