MySQL Event历史记录

需求

SQL Server的作业历史（Job）记录是保存在msdb库中的，很方便就查询相关的Job定义，计划和历史记录，而MySQL的event却没有历史记录。为方便查看event是否正常执行以及执行结果，通过以下两个步骤来实现类似的功能。

 

实现

1. 在mysql库创建event执行的历史记录表

CREATE TABLE `mysql`.`udf_event_history` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`event_gid` varchar(36) NOT NULL,
`db_name` varchar(128) NOT NULL DEFAULT '',
`event_name` varchar(128) NOT NULL DEFAULT '',
`start_time` datetime(3) NOT NULL DEFAULT current_timestamp(),
`end_time` datetime(3) DEFAULT NULL,
`is_success` tinyint(4) DEFAULT 0,
`duration` decimal(15,3) DEFAULT NULL,
`error_msg` varchar(512) DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `idx_event_git` (`event_gid`),
KEY `idx_db_event_name` (`db_name`,`event_name`),
KEY `idx_s_e_time` (`start_time`,`end_time`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

2．根据以下建模板创建event

请注意根据实际情况修改相关信息

USE db1;

DELIMITER $$

CREATE DEFINER=`root`@`localhost` EVENT `event_test1`
ON SCHEDULE EVERY 1 MINUTE STARTS '2019-01-01 00:00:00'
ON COMPLETION PRESERVE ENABLE DO
BEGIN
    DECLARE r_code CHAR(5) DEFAULT '';
    DECLARE r_msg TEXT;
    DECLARE v_error INT;
    DECLARE v_start_time DATETIME(3) DEFAULT NOW(3);
    DECLARE v_event_gid VARCHAR(36) DEFAULT UPPER(REPLACE(UUID(),'-',''));  

    /*修改为实际的event名*/
    INSERT INTO mysql.udf_event_history (db_name, event_name, start_time, event_gid)
    VALUES(DATABASE(), 'event_test1', v_start_time, v_event_gid);    

    BEGIN
        DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
        BEGIN
            SET  v_error = 1;
            GET DIAGNOSTICS CONDITION 1 r_code = RETURNED_SQLSTATE, r_msg = MESSAGE_TEXT;
        END;
        /*实际要执行语句或存储过程，等*/
        CALL db1.usp_1();
    END;  

    UPDATE mysql.udf_event_history
    SET end_time = NOW(3), is_success = ISNULL(v_error), duration = TIMESTAMPDIFF(microsecond,start_time, NOW(3)) / 1000000,
    error_msg = CONCAT('error = ', r_code,', message = ', r_msg)
    WHERE event_gid = v_event_gid;  

END$$
DELIMITER ; 

通过查询mysql.udf_event_history表，可以知道event的开始结束时间、是否成功、执行时长、错误信息，等，为管理日常调度计划提供方便。

root@localhost [db1]select * from mysql.udf_event_history limit 2\G;
*************************** 1. row ***************************
        id: 1
   db_name: db1
event_name: event_test1
start_time: 2019-12-03 15:44:00.000
  end_time: 2019-12-03 15:44:00.001
is_success: 0
  duration: 0.001
 error_msg: error = 42000, message = PROCEDURE db1.usp_2 does not exist
 event_gid: AB305D8C15A011EAB822005056AB041E
*************************** 2. row ***************************
        id: 2
   db_name: db1
event_name: event_test2
start_time: 2019-12-03 15:46:00.000
  end_time: 2019-12-03 15:46:05.405
is_success: 1
  duration: 5.405
 error_msg: NULL
 event_gid: F2B6197C15A011EAB822005056AB041E

参考

https://blog.csdn.net/wrh_csdn/article/details/79712778