MySQL按时间进行表分区的方法代码

create table if not exists table_name
(
    id          bigint auto_increment comment '主键id',
    
    create_by   varchar(64)                        not null comment '创建者',
    create_time datetime default CURRENT_TIMESTAMP not null comment '创建时间',
    update_by   varchar(64)                        null comment '更新者',
    update_time datetime default CURRENT_TIMESTAMP null on update CURRENT_TIMESTAMP comment '更新时间',
    primary key (id, create_time)
)
    comment '测试表名' partition by range (TO_DAYS(create_time)) (
    partition P202401 values less than (TO_DAYS('2024-02-01')) ,
    partition P202402 values less than (TO_DAYS('2024-03-01')) ,
    partition P202403 values less than (TO_DAYS('2024-04-01')) ,
    partition P202404 values less than (TO_DAYS('2024-05-01'))
);

-- 开启事件
SET GLOBAL event_scheduler = ON;
-- 查看事件是否开启
SHOW VARIABLES LIKE '%event_sche%';

sudo vi /etc/my.cnf

event_scheduler = ON

sudo systemctl restart mysqld

create event event_create_partition on schedule
    every '1' MONTH starts '2024-04-01 00:00:00'
    on completion preserve
    enable 
    do 
    BEGIN
    
    	-- 当前时间 2024-04-01 00:00:00
		-- _DATE = 2024-05-01
    	DECLARE _DATE VARCHAR(10) DEFAULT ADDDATE(SUBDATE(CURDATE(), DAY(CURDATE()) - 1), INTERVAL 1 MONTH);
    	-- P202405
    	SET @PARTITION_NAME = CONCAT('P', DATE_FORMAT(_DATE, '%Y%m'));
    	-- 2024-06-01
    	SET @SHEAR_DATE = CONCAT('', ADDDATE(LAST_DAY(_DATE), 1));
    	
        SET @SQL = CONCAT('ALTER TABLE table_name ADD PARTITION (PARTITION ', @PARTITION_NAME, ' VALUES LESS THAN (TO_DAYS("', @SHEAR_DATE, '")))');
        PREPARE STMT FROM @SQL;
        EXECUTE STMT;
        DEALLOCATE PREPARE STMT;

    END;

SHOW EVENTS;

SELECT
   TABLE_SCHEMA,
   TABLE_NAME,
   PARTITION_NAME,
   PARTITION_METHOD,
   PARTITION_EXPRESSION,
   SUBPARTITION_NAME,
   SUBPARTITION_METHOD,
   SUBPARTITION_EXPRESSION
FROM information_schema.partitions
WHERE TABLE_SCHEMA = '数据库名'
AND TABLE_NAME IN ('table_name')
ORDER BY PARTITION_NAME DESC;