https://blog.csdn.net/erdongritian/article/details/53158617
1,需求:每天晚上10点到早上5点,每10分钟定时执行存储过程。
2,实现方式:实现方式有两种:
一种是比较常规的,用mysql的event定时任务,先介绍一下mysql中event定时任务的相关命令,
查看event是否启用:
- SELECT @@event_scheduler;
- SHOW VARIABLES LIKE 'event%';
开启定时任务:
- set GLOBAL event_scheduler = 1;
- SET GLOBAL event_scheduler = ON;
建立定时任务:
- DROP EVENT IF EXISTS JOB_ALARM;
- CREATE EVENT JOB_ALARM
- ON SCHEDULE EVERY 10 MINUTE
- DO
- BEGIN
- if(date_format(current_time(),'%H')>22 || date_format(current_time(),'%H')<5) THEN
- CALL PRO_ALARM();
- END IF;
- END
建立存储过程:
- DROP PROCEDURE IF EXISTS PRO_ALARM;
- CREATE PROCEDURE PRO_ALARM()
- BEGIN
- DECLARE userId VARCHAR(32);
- #这个用于处理游标到达最后一行的情况
- DECLARE s INT DEFAULT 0;
- #声明游标cursor_name(cursor_name是个多行结果集)
- DECLARE cursor_data CURSOR FOR
- SELECT tmp.USER_ID
- FROM (
- SELECT
- e.USER_ID,
- MAX(e.TIME_GMT) TIME_GMT
- FROM EVENTS e
- GROUP BY e.USER_ID
- HAVING MAX(e.TIME_GMT) < UNIX_TIMESTAMP() - 60 * 30
- AND MAX(e.TIME_GMT) > UNIX_TIMESTAMP() - 60 * 60 * 24) tmp
- INNER JOIN EVENTS t ON tmp.USER_ID = t.USER_ID
- AND tmp.TIME_GMT = t.TIME_GMT
- WHERE TYPE_ID != '34001';
- #设置一个终止标记
- DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET s = 1;
- OPEN cursor_data;
- #获取游标当前指针的记录,读取一行数据并传给变量a,b
- FETCH cursor_data
- INTO userId;
- #开始循环,判断是否游标已经到达了最后作为循环条件
- WHILE s <> 1 DO
- INSERT INTO EVENTS_NOTIFICATION VALUES (NULL, SYSDATE(), UNIX_TIMESTAMP(SYSDATE()),
- UNIX_TIMESTAMP(SYSDATE()), '00000', userId, '1', '0');
- #读取下一行的数据
- FETCH cursor_data
- INTO userId;
- END WHILE;
- #关闭游标
- CLOSE cursor_data;
- END;
在配置定时器时有一些局限性,并且由于博主使用的mysql启用了skip-grant-tables,在设置event开启时,总是报错,所以想到了第二种实现方式,具体报错信息如下:
- [HY000][1290] The MySQL server is running with the --event-scheduler=DISABLED or --skip-grant-tables option so it cannot execute this statement
第二种实现方式是利用linux的定时任务,
linux定时任务基本命令:
查看定时任务:crontab -l
编辑定时任务:crontab -e
*/10 22-23,0-5 * * * mysql -u用户名 -p密码 -e "use db_name;CALL PRO_ALARM();"
或者把use db_name;CALL PRO_ALARM();存到sql脚本中,编辑定时任务如下:
*/10 22-23,0-5 * * * mysql -u用户名 -p密码 < /application/Job_mysql.sql