Oracle 游标用For循环比较简单，MySQL也是最近才开始用，感觉稍微麻烦一点，下边直接上代码：
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-- Oracle
-- 内嵌游标为带参游标，参数为外游标值
-----------------------------------------------------------
DECLARE
cursor cur_outer is select dept_id from tbl_test_dept;
cursor cur_inner(deptid varchar2) is (SELECT user_id FROM tbl_test_user WHERE dept_id=deptid);
BEGIN
FOR DEPT_ITEM IN cur_outer LOOP
--
--
FOR KEY_ITEM IN cur_process(DEPT_ITEM.DEPT_ID) LOOP --开始内循环
--
--
END LOOP;
END LOOP;
commit;
END;
------------------------------
-- Mysql
-- HANDLER 只能申明一个
-- 内循环结束后需要重置done
-- 发现mysql不能直接执行begin..end，需要创建存储过程后调用执行；
------------------------------
CREATE PROCEDURE `PROC_CURSOR_TEST`()
BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE item_outer VARCHAR(50);outer
DECLARE item_inner VARCHAR(50);
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
-- 定义内外游标
DECLARE cur_outer cursor for select dept_id from tbl_test_dept;
DECLARE cur_inner cursor for (SELECT user_id FROM tbl_test_user WHERE dept_id=item_outer);-- 查询条件可直接用外游标变量值
OPEN cur_outer;
out_loop: LOOP
fetch cur_outer into item_outer;
IF done THEN -- 判断是否继续循环
LEAVE out_loop;
END IF;
--
--
OPEN cur_process; -- 打开内嵌游标
inner_loop: LOOP
fetch cur_inner into item_inner;
IF done THEN
LEAVE inner_loop;
END IF;
--
--
end loop;
CLOSE cur_inner;
SET done = 0; -- 关闭内游标，重置done
end loop;
CLOSE cur_outer;
commit;
END;
call PROC_CURSOR_TEST(); -- 调用存储过程
drop procedure PROC_CURSOR_TEST; --删除