定时更新表字段列的值状态(存储过程+定时任务)

现在又两个表tcm,doc；
db_count:                                       
id     count
1       220
2       300
3       220
4       222
5       240
db_date:
id              t_date                   count   
1       2012-09-10 17:04:07              220
2       2012-09-11 15:04:07              224
3       2012-08-20 11:04:07              225
4       2012-02-11 17:04:07              300
5       2012-09-11 10:04:07              500
6       2012-09-12 17:04:07              300


---存储过程变更db_count表count值为0；
DELIMITER //
CREATE PROCEDURE update_count()
BEGIN
   DECLARE m date;
   DECLARE y CURSOR for select t_date from db_date;
   declare CONTINUE HANDLER FOR SQLSTATE '02000' SET k=1;
   OPEN y;
   FETCH y INTO m;
IF SYSDATE()>m THEN
UPDATE db_date t,db_count g SET g.count=0 WHERE t.id=g.id;
END IF;
CLOSE y;
END //
DELIMITER;


----事件，事件间隔为1秒，进行执行该事件
DELIMITER //
CREATE EVENT  my_count
ON SCHEDULE EVERY 1 second  do
begin
call update_count();
end //
DELIMITER;


select * from db_count;