Oracle pl/sql引用(返回?)游标/声明游标

Oracle pl/sql引用(返回?)游标/声明游标,sql,oracle,cursor,Sql,Oracle,Cursor,有没有办法做到这一点?是否将游标获取的数据输出到refcursor中,而不首先将其填充到表中 create or replace procedure someprocedure ( rc1 in out adv_refcur_pkg.rc) -- this is defined below as v_class_year varchar(10); cursor c1 is select distinct e.pref_class_year from entity e where e.pre

有没有办法做到这一点?是否将游标获取的数据输出到refcursor中,而不首先将其填充到表中

create or replace procedure someprocedure
(
rc1 in out adv_refcur_pkg.rc)  -- this is defined below
as

v_class_year varchar(10);

cursor c1
is
select distinct e.pref_class_year
from entity e
where e.pref_class_year between i_start_class and i_end_class;

begin
open c1;
loop
fetch c1 into v_class_year;
EXIT WHEN c1%NOTFOUND;

end loop;
close c1;

open rc1 for select v_class_year from dual;
end;
这是refcursor的声明

CREATE OR REPLACE PACKAGE ADVANCE.adv_refcur_pkg
AS
TYPE RC IS REF CURSOR;
END adv_refcur_pkg;

根据这个例子,是的,有可能:


根据这个例子,是的,有可能:


当您可以简单地传递光标本身时,为什么还要费心这么做呢

create or replace procedure someprocedure
(
rc1 in out adv_refcur_pkg.rc)  -- this is defined below
as
begin
open rc1 for
   select distinct e.pref_class_year
     from entity e
    where e.pref_class_year between i_start_class and i_end_class;
end;
当您调用“someprocedure”时,您有一个打开的光标,可以从以下位置获取:

BEGIN
...
  someprocedure(TheCursor);
  LOOP
    fetch TheCursor into v_class_year;
    exit when TheCursor%NOTFOUND;
    ...
  END LOOP;
  CLOSE TheCursor;
...
END;

当您可以简单地传递光标本身时,为什么还要麻烦地这样做呢

create or replace procedure someprocedure
(
rc1 in out adv_refcur_pkg.rc)  -- this is defined below
as
begin
open rc1 for
   select distinct e.pref_class_year
     from entity e
    where e.pref_class_year between i_start_class and i_end_class;
end;
当您调用“someprocedure”时,您有一个打开的光标,可以从以下位置获取:

BEGIN
...
  someprocedure(TheCursor);
  LOOP
    fetch TheCursor into v_class_year;
    exit when TheCursor%NOTFOUND;
    ...
  END LOOP;
  CLOSE TheCursor;
...
END;

只需打开
rc1
光标以进行
c1
光标定义中使用的查询。只需打开
rc1
光标以进行
c1
光标定义中使用的查询。