mysql中的事件調度器可以定時對數據庫增加,刪除和執行操作,相當于數據庫中的臨時觸發器,與Linux系統中的執行計劃任務一樣,這樣就可以大大降低工作量.1.開啟事件

mysql中的事件調度器可以定時對數據庫增加,刪除和執行操作,相當于數據庫中的臨時觸發器,與Linux系統中的執行計劃任務一樣,這樣就可以大大降低工作量.

1.開啟事件調度器

[root@node1 ~]# vim /usr/my.cnf --在配置文件中加入以下語句啟用調度器

event_scheduler=1

[root@node1 ~]# /etc/init.d/mysql restart

ERROR! MySQL server PID file could not be found!

Starting MySQL... SUCCESS!

[root@node1 ~]#

2.查看事件調度是否開啟

[root@node1 ~]# mysql -u root -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.6.21 MySQL Community Server (GPL)

Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show variables like "event_%"; --查看調度器是否啟用

+-----------------+-------+

| Variable_name | Value |

+-----------------+-------+

| event_scheduler | ON |

+-----------------+-------+

1 row in set (0.00 sec)

mysql> ? create event; --查看創建事件的語法

Name: 'CREATE EVENT'

Description:

Syntax:

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;

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}

mysql> create database test123;

Query OK, 1 row affected (0.00 sec)

mysql> \u test123

Database changed

mysql>

3.創建事件調度5秒鐘后創建t表

mysql> create event if not exists event_t on schedule at current_timestamp + interval 5 second do create table t (a int,b nchar(10),c timestamp);

Query OK, 0 rows affected (0.00 sec)

mysql> show events; --查看事件是否創建成功

+---------+----------+----------------+-----------+-----------+------------+----------------+----------------+---------------------+------+---------+------------+----------------------+----------------------+--------------------+

| Db | Name | Definer | Time zone | Type | Execute at | Interval value | Interval field | Starts | Ends | Status | Originator | character_set_client | collation_connection | Database Collation |

+---------+----------+----------------+-----------+-----------+------------+----------------+----------------+---------------------+------+---------+------------+----------------------+----------------------+--------------------+

| test123 | event_t1 | root@localhost | SYSTEM | RECURRING | NULL | 5 | SECOND | 2014-11-12 15:29:13 | NULL | ENABLED | 0 | utf8 | utf8_general_ci | latin1_swedish_ci |

+---------+----------+----------------+-----------+-----------+------------+----------------+----------------+---------------------+------+---------+------------+----------------------+----------------------+--------------------+

1 row in set (0.00 sec)

mysql> show tables;

Empty set (0.00 sec)

mysql> show tables; --創建表成功

+-------------------+

| Tables_in_test123 |

+-------------------+

| t |

+-------------------+

1 row in set (0.00 sec)

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