MYSQL教程详解MySQL用事件调度器Event Scheduler创建定时任务

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CREATE
  [DEFINER = { user | CURRENT_USER }]
  EVENT
  [IF NOT EXISTS]
  event_name
  ON SCHEDULE schedule
  [ON COMPLETION [NOT] PRESERVE]
  [ENABLE | DISABLE | DISABLE ON SLAVE]
  [COMMENT 'comment']
  DO event_body;

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schedule:
  AT timestamp [+ INTERVAL interval] ...
 | EVERY interval
  [STARTS timestamp [+ INTERVAL interval] ...]
  [ENDS timestamp [+ INTERVAL interval] ...]
interval:
  quantity {YEAR | QUARTER | MONTH | DAY | HOUR | MINUTE |
       WEEK | SECOND | YEAR_MONTH | DAY_HOUR | DAY_MINUTE |
       DAY_SECOND | HOUR_MINUTE | HOUR_SECOND | MINUTE_SECOND}

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SHOW EVENTS;

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ALTER
  [DEFINER = { user | CURRENT_USER }]
  EVENT event_name
  [ON SCHEDULE schedule]
  [ON COMPLETION [NOT] PRESERVE]
  [RENAME TO new_event_name]
  [ENABLE | DISABLE | DISABLE ON SLAVE]
  [COMMENT 'comment']
  [DO event_body]

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ALTER EVENT e_test ON COMPLETION PRESERVE ENABLE;

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ALTER EVENT e_test ON COMPLETION PRESERVE DISABLE;

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CREATE EVENT myevent
  ON SCHEDULE 
  AT CURRENT_TIMESTAMP + INTERVAL 1 HOUR
  DO
   UPDATE myschema.mytable SET mycol = mycol + 1;

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CREATE EVENT myevent
  ON SCHEDULE 
  EVERY 1 HOUR
  STARTS CURRENT_TIMESTAMP
  DO
   UPDATE myschema.mytable SET mycol = mycol + 1;

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CREATE EVENT myevent
  ON SCHEDULE 
  EVERY 1 HOUR
  STARTS CURRENT_TIMESTAMP + INTERVAL 1 DAY
  DO
   UPDATE myschema.mytable SET mycol = mycol + 1;

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DELIMITER // 
CREATE EVENT e 
ON SCHEDULE 
  EVERY 5 SECOND 
DO 
BEGIN 
  DECLARE v INTEGER; 
  DECLARE CONTINUE HANDLER FOR SQLEXCEPTION BEGIN END; 
  SET v = 0; 
  WHILE v < 5 DO 
    INSERT INTO t1 VALUES (0);   
    UPDATE t2 SET s1 = s1 + 1; 
    SET v = v + 1; 
  END WHILE; 
END // 
DELIMITER ; 

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SHOW VARIABLES LIKE 'event_scheduler';
SELECT @@event_scheduler;
SHOW PROCESSLIST;

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SELECT * FROM information_schema.EVENTS;

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SELECT EVENT_NAME, LAST_EXECUTED FROM information_schema.EVENTS;

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SET GLOBAL event_scheduler = 1;
SET @@global.event_scheduler = 1;
SET GLOBAL event_scheduler = ON;
SET @@global.event_scheduler = ON;