CREATE TABLE `sys_log` (
  `log_id` int(10) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
  `user_id` int(10) DEFAULT NULL COMMENT '用户ID',
  `class_function` varchar(255) DEFAULT NULL COMMENT '类和方法名',
  `function_id` int(10) DEFAULT NULL COMMENT '功能id',
  `description` varchar(255) DEFAULT NULL COMMENT '功能名称',
  `sub_desc` varchar(255) DEFAULT NULL COMMENT '子功能',
  `ip` varchar(255) DEFAULT NULL,
  `create_time` datetime DEFAULT NULL COMMENT '创建时间',
  `type` int(10) DEFAULT NULL COMMENT '类型【1：异常 2：使用方法】',
  PRIMARY KEY (`log_id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

ALTER TABLE `sys_log` DROP PRIMARY KEY,ADD PRIMARY KEY (log_id, create_time);

ALTER TABLE `sys_log` PARTITION by RANGE COLUMNS (create_time)
(PARTITION `p1` VALUES LESS THAN ('2019-01-01'),
PARTITION `p2` VALUES LESS THAN (MAXVALUE) ENGINE = InnoDB);

CREATE DEFINER=`root`@`%` PROCEDURE `proc_create_partition`(in_tbname VARCHAR(64))
BEGIN

SELECT DATABASE() INTO @dbname;

SET @tbname = in_tbname;

#查询表的最近一次分区
SELECT
    REPLACE (partition_name, 'p', '') INTO @PMAX
FROM
    INFORMATION_SCHEMA.PARTITIONS
WHERE
    TABLE_SCHEMA = @dbname
AND table_name = @tbname
ORDER BY
    partition_ordinal_position DESC
LIMIT 1;

#查询表的最近一次分区
SELECT
REPLACE(partition_description, "'", '') INTO @DNAME
FROM
    INFORMATION_SCHEMA.PARTITIONS
WHERE
    TABLE_SCHEMA = @dbname
AND table_name = @tbname
ORDER BY
    partition_ordinal_position DESC
LIMIT 1, 1;


SET @t=CONCAT('alter table `',@dbname,'`.',@tbname,' reorganize partition p',@PMAX,
                          ' into(partition p',@PMAX,' values less than (''',date(DATE_ADD(@DNAME,INTERVAL 1 MONTH)),'''),',
                            'partition p',@PMAX+1,' values less than MAXVALUE)');

SELECT @t;
PREPARE stmt FROM @t;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

COMMIT;
END

CREATE DEFINER=`root`@`%` PROCEDURE `proc_create_partition_all`()
BEGIN

  DECLARE tbname varchar(32);
  DECLARE tmpSql varchar(256);
  DECLARE done INT DEFAULT FALSE ;

#查询已手动分区的表
    DECLARE part_cursor CURSOR FOR (SELECT DISTINCT table_name FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_SCHEMA = DATABASE() AND partition_expression IS NOT NULL AND table_name NOT LIKE '%bak');
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

#循环对表添加分区
    OPEN part_cursor;
        myLoop: LOOP
            FETCH part_cursor INTO tbname;
            IF done THEN
                LEAVE myLoop;
            END IF;
            #调用分区存储过程
            CALL proc_create_partition(tbname);

            COMMIT;
        END LOOP myLoop;
    CLOSE part_cursor;
   
END

CREATE DEFINER=`root`@`%` EVENT `e_create_partition`
ON SCHEDULE EVERY 1 MONTH STARTS '2019-08-01 00:00:00'
ON COMPLETION PRESERVE DISABLE
DO CALL proc_create_partition_all()