MySql如何执行定时任务
MySql如何执行定时任务
Mysql属于中小型数据库系统，它的事件调度器Event Scheduler是在mysql 5.1才开始引入事件调度器是在 MySQL 5.1 中新增的另一个特色功能，可以作为定时任务调度器，取代部分原先只能用操作系统任务调度器才能完成的定时功能。事件调度器是定时触发执行的，在这个角度上也可以称作是"临时的触发器"。触发器只是针对某个表产生的事件执行一些语句，而事件调度器则是在某一个(间隔)时间执行一些语句。事件是由一个特定的线程来管理的，也就是所谓的"事件调度器"。代码：
/*开启event_scheduler，也可以设置为on*/
set global event_scheduler =1;
/*创建简单的任务，每分钟执行一次，从一个表取数据插入到另一个表，也可以定时取，可以参看下面文档，此处为简单例子*/
CREATE EVENT MyEvent
ON SCHEDULE EVERY 1 MINUTE
DO
INSERT INTO list_test (字段1,字段1,字段1,字段1,字段1) select 字段1,字段1,字段1,字段1,字段1 from 表2 where id = 510;
/*每天固定时间执行*/
CREATE EVENT EVENT_ADD_FOR20_ENOUGH
ON SCHEDULE EVERY 1 DAY
STARTS TIMESTAMP '2009-12-18 02:58:00'/×MYSQL注意时区设置，默认非中国时区×/
DO
SQL语句
下载：MySQL-Events-CN.rar
再加两段吧
代码：
DELIMITER $$
DROP PROCEDURE IF EXISTS `mystock`.`TEST_KKK`$$
CREATE PROCEDURE `mystock`.`TEST_KKK`()
/*LANGUAGE SQL
[NOT] DETERMINISTIC
{ CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
SQL SECURITY { DEFINER | INVOKER }
COMMENT 'string'*/
BEGIN
DECLARE NUM INTEGER DEFAULT 0;
DECLARE $A INT;
SELECT (20-COUNT(STOCK_CODE)) as number into NUM FROM get_stock_list WHERE FLAG = 0 AND STIME = curdate();
IF NUM>0 THEN
PREPARE STMP FROM 'INSERT INTO get_stock_list (stock_code,stock_name,close,raises,stime) select stock_code,stock_name,close,result1,selectd from choice_stock where stock_code not in (select stock_code from get_stock_list where stime = curdate() and flag = 0) and selectd = curdate() and selectd = curdate() order by id limit ?' ;
SET @A = NUM;
EXECUTE STMP USING @A;
END IF;
END$$
DELIMITER ;
代码：
DELIMITER $$
DROP FUNCTION IF EXISTS `mystock`.`FUNCTION_ADD_STOCK_FOR20`$$
CREATE DEFINER=`root`@`localhost` FUNCTION `FUNCTION_ADD_STOCK_FOR20`() RETURNS int(11)
BEGIN
DECLARE NUM,ANOTHER INTEGER;
SELECT COUNT(STOCK_CODE) as number into NUM FROM get_stock_list WHERE FLAG = 0 AND STIME = curdate();
if(NUM<20)
THEN
SET ANOTHER = 20 - NUM;
INSERT INTO get_stock_list (stock_code,stock_name,close,raises,stime) select stock_code,stock_name,close,result1,selectd from choice_stock where stock_code not in (select stock_code from get_stock_list where stime = curdate() and flag = 0) order by id LIMIT 10;
END IF;
RETURN NUM;
END$$
DELIMITER ;