一些数据库的循环方法

一些数据库的循环方法：

Mysql

1. drop
   PROCEDURE
   if
   exists myLoop;
2. create
   PROCEDURE myLoop(begin_date varchar(10), end_date varchar(10))
3. begin
4. ????declare v_date datetime;
5. ????declare v_begin_date, v_end_date varchar(10);
6. ????set v_date = begin_date;
7. ????while v_date < end_date do
8. ????????set v_begin_date = DATE_FORMAT(v_date,‘%Y-%m-%d‘);
9. ????????set v_date = DATE_ADD(v_date, INTERVAL 1 DAY);
10. ????????set v_end_date = DATE_FORMAT(v_date,‘%Y-%m-%d‘);
11. ????????select v_begin_date, v_end_date;
12. ????????-- write your sql here!
13. ????end
    while;
14. end;
15. -- call myLoop(‘2013-08-15‘,‘2013-09-02‘);

?

?

Oracle

1. declare
2. ???????v_date date;
3. ???????v_begin_date varchar2(10);
4. ???????v_end_date varchar2(10);
5. begin
6. ???????v_date := date‘2014-06-02‘;
7. ???????while v_date < date‘2014-06-20‘ loop
8. ?????????????v_begin_date := to_char(v_date, ‘yyyy-mm-dd‘);
9. ?????????????v_date := v_date + 1;
10. ?????????????v_end_date := to_char(v_date, ‘yyyy-mm-dd‘);
11. ?????????????dbms_output.put_line(v_begin_date||‘ === ‘||v_end_date);
12. ?????????????-- write your sql here!
13. ?????????end loop;
14. ?????????commit;
15. end;