如何在 MySQL 中调度存储过程

Question

I have this stored procedure. How can I run this for example with intervals of 5 seconds? Like a routine for eliminate data with a time-stamp older than one day?

DROP PROCEDURE IF EXISTS `delete_rows_links` 
GO

CREATE PROCEDURE delete_rows_links
BEGIN 

    DELETE activation_link
    FROM activation_link_password_reset
    WHERE  TIMESTAMPDIFF(DAY, `time`, NOW()) < 1 ; 

END 

GO

Answer 1

You can use mysql scheduler to run it each 5 seconds. You can find samples at http://dev.mysql.com/doc/refman/5.1/en/create-event.html

Never used it but I hope this would work:

CREATE EVENT myevent
    ON SCHEDULE EVERY 5 SECOND
    DO
      CALL delete_rows_links();

Answer 2

I used this query and it worked for me:

CREATE EVENT `exec`
  ON SCHEDULE EVERY 5 SECOND
  STARTS '2013-02-10 00:00:00'
  ENDS '2015-02-28 00:00:00'
  ON COMPLETION NOT PRESERVE ENABLE
DO 
  call delete_rows_links();

Answer 3

In order to create a cronjob, follow these steps:

1. run this command: SET GLOBAL event_scheduler = ON;

2. If ERROR 1229 (HY000): Variable 'event_scheduler' is a GLOBAL variable and should be set with SET GLOBAL: mportant

It is possible to set the Event Scheduler to DISABLED only at server startup. If event_scheduler is ON or OFF, you cannot set it to DISABLED at runtime. Also, if the Event Scheduler is set to DISABLED at startup, you cannot change the value of event_scheduler at runtime.

To disable the event scheduler, use one of the following two methods:

1. As a command-line option when starting the server:

    --event-scheduler=DISABLED

2. In the server configuration file (my.cnf, or my.ini on Windows systems): include the line where it will be read by the server (for example, in a [mysqld] section):

    event_scheduler=DISABLED

   Read MySQL documentation for more information.

    DROP EVENT IF EXISTS EVENT_NAME; CREATE EVENT EVENT_NAME ON SCHEDULE EVERY 10 SECOND/minute/hour DO CALL PROCEDURE_NAME();

Answer 4

If you're open to out-of-the-DB solution: You could set up a cron job that runs a script that will itself call the procedure.