-- 要查看当前是否已开启事件调度器 SHOW PROCESSLIST; SHOW VARIABLES LIKE 'performance_schema'; SHOW VARIABLES LIKE 'event_scheduler'; -- 开启事件调度器 SET GLOBAL event_scheduler=1 -- 或:SET GLOBAL event_scheduler = ON; 或:my.ini or my.cnf 中的添加 event_scheduler=ON -- 创建事件(CREATE EVENT) /*语法: CREATE EVENT [IF NOT EXISTS] event_name ON SCHEDULE schedule [ON COMPLETION [NOT] PRESERVE] [ENABLE | DISABLE] [COMMENT 'comment'] DO sql_statement; schedule: AT TIMESTAMP [+ INTERVAL INTERVAL] | EVERY INTERVAL [STARTS TIMESTAMP] [ENDS TIMESTAMP] INTERVAL: quantity {YEAR | QUARTER | MONTH | DAY | HOUR | MINUTE | WEEK | SECOND | YEAR_MONTH | DAY_HOUR | DAY_MINUTE | DAY_SECOND | HOUR_MINUTE | HOUR_SECOND | MINUTE_SECOND} */ -- 首先来看一个简单的例子来演示每秒插入一条记录到数据表: 等待3秒钟后,再执行查询成功。 USE readandwrite_test; DROP TABLE IF EXISTS `aaa`; -- CREATE TABLE aaa (timeline TIMESTAMP); CREATE TABLE `aaa` ( `id` int(11) NOT NULL AUTO_INCREMENT, timeline TIMESTAMP, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; DROP EVENT IF EXISTS e_test_insert; CREATE EVENT e_test_insert ON SCHEDULE EVERY 1 SECOND DO INSERT INTO readandwrite_test.aaa(timeline) VALUES (CURRENT_TIMESTAMP); -- 每隔5秒将执行存储过程test,将当前时间更新到aaa表中id=14的记录的timeline字段中去. CREATE PROCEDURE test () BEGIN update aaa SET timeline = CURRENT_TIMESTAMP WHERE id = 14; END; CREATE EVENT if not exists e_test on schedule every 5 second on completion preserve do call test(); /** MYSQL取一个月前一个月后的时间 date_add() 增加 date_sub()减少 month 月份 minute 分钟 second 秒 例如:select DATE_ADD(NOW(),INTERVAL 1 MONTH); //一个月后的时间 -- =================================================================================== -- 5天后清空test表: CREATE EVENT e_test ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 5 DAY DO TRUNCATE TABLE readandwrite_test.aaa; -- 2007年7月20日12点整清空test表: CREATE EVENT e_test ON SCHEDULE AT TIMESTAMP '2007-07-20 12:00:00' DO TRUNCATE TABLE readandwrite_test.aaa; -- 每天定时清空test表: CREATE EVENT e_test ON SCHEDULE EVERY 1 DAY DO TRUNCATE TABLE readandwrite_test.aaa; -- 5天后开启每天定时清空test表: CREATE EVENT e_test ON SCHEDULE EVERY 1 DAY STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY DO TRUNCATE TABLE readandwrite_test.aaa; -- 每天定时清空test表,5天后停止执行: CREATE EVENT e_test ON SCHEDULE EVERY 1 DAY ENDS CURRENT_TIMESTAMP + INTERVAL 5 DAY DO TRUNCATE TABLE readandwrite_test.aaa; -- 5天后开启每天定时清空test表,一个月后停止执行: CREATE EVENT e_test ON SCHEDULE EVERY 1 DAY STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY ENDS CURRENT_TIMESTAMP + INTERVAL 1 MONTH DO TRUNCATE TABLE readandwrite_test.aaa; -- 每天定时清空test表(只执行一次,任务完成后就终止该事件): CREATE EVENT e_test ON SCHEDULE EVERY 1 DAY ON COMPLETION NOT PRESERVE -- [ON COMPLETION [NOT] PRESERVE]可以设置这个事件是执行一次还是持久执行,默认为NOT PRESERVE。 DO TRUNCATE TABLE readandwrite_test.aaa; -- 修改事件(ALTER EVENT) /*ALTER EVENT event_name [ON SCHEDULE schedule] [RENAME TO new_event_name] [ON COMPLETION [NOT] PRESERVE] [COMMENT 'comment']-- 可以给该事件加上注释。 [ENABLE | DISABLE]-- 可是设置该事件创建后状态是否开启或关闭,默认为ENABLE。 [DO sql_statement] */ -- 临时关闭事件 ALTER EVENT e_test DISABLE; -- 关闭事件任务: alter event e_test ON COMPLETION PRESERVE DISABLE; -- 开启事件 ALTER EVENT e_test ENABLE; -- 开户事件任务: alter event e_test ON COMPLETION PRESERVE ENABLE; -- 将每天清空test表改为5天清空一次: ALTER EVENT e_test ON SCHEDULE EVERY 5 DAY; -- 删除事件(DROP EVENT) /*语法很简单,如下所示: DROP EVENT [IF EXISTS] event_name */ DROP EVENT e_test;-- 当然前提是这个事件存在,否则会产生ERROR 1513 (HY000): Unknown event错误,因此最好加上IF EXISTS DROP EVENT IF EXISTS e_test;