MySQL creates partition tables and automatically partitions them by day

# Create test database
create database csl_test character set utf8 collate utf8_unicode_ci;

# Create test table
notes ： Fields to partition Primary key required .

use csl_test; # Switch to the test database just created

create table t_partition_test (
    pk_id bigint(20) not null auto_increment,
    time datetime not null,
    msg varchar(200),
    primary key (pk_id,time)
)engine=innodb default charset=utf8 collate utf8_unicode_ci comment="test partition";

# Insert test data
insert into t_partition_test(time,msg) values
    ('2021-02-01 13:34:23',"20210201133423"),
    ('2021-02-02 14:23:13',"20210202142313");

# Partition the table
# Modify the primary key field
alter table t_partition_test drop primary key, add primary key (pk_id, time);

# Batch partition
alter table t_partition_test partition by range columns(time)(
    partition p20210201 values less than('2021-02-02'),
    partition p20210202 values less than('2021-02-03'),
    partition p20210203 values less than('2021-02-04')
);


# Look at the table partition
select partition_name,partition_description as val from information_schema.partitions
where table_name = 't_partition_test' and table_schema = 'csl_test';

# Create a stored procedure to add or delete partitions

--  Definition mysql Submit query statement   End identification   by  $$
DELIMITER $$
DROP PROCEDURE IF EXISTS p_partition_test #  The creation process  p_partition_test
$$
CREATE PROCEDURE p_partition_test()
BEGIN
  DECLARE v_sysdate DATE; #  Statement   current time 
  DECLARE v_mindate DATE; #  Statement   The minimum value of the current partition 
  DECLARE v_maxdate DATE; #  Statement   The maximum value in the current partition value 
  DECLARE v_pt VARCHAR(20); #  Statement   Partition name   The digital part 
  DECLARE v_maxval VARCHAR(20); #  Statement   Maximum 
  DECLARE i INT; #  Statement  ??
  
  --  Add new partition 
  -- select into A from B  usage ;A Table as a temporary table , non-existent . 
  --  differ insert into A select from B,A There must be .
  SELECT MAX(CAST(REPLACE(partition_description, '''', '') AS DATE)) AS val
  INTO   v_maxdate
  FROM   INFORMATION_SCHEMA.PARTITIONS
  WHERE  TABLE_NAME = 't_partition_test' AND TABLE_SCHEMA = 'csl_test';
  
  SET v_sysdate = SYSDATE(); #  assignment v_sysdate For the current time 
  
  -- INTERVAL  Keywords for time calculation 
  WHILE v_maxdate <= (v_sysdate + INTERVAL 3 DAY) DO
    SET v_pt = DATE_FORMAT(v_maxdate ,'%Y%m%d');
    SET v_maxval = DATE_FORMAT(v_maxdate + INTERVAL 1 DAY, '%Y-%m-%d');
    SET @sql = CONCAT('alter table t_partition_test add partition (partition p', v_pt, ' values less than(''', v_maxval, '''))');
    -- SQL Statement preprocessing , For repeated calls to the same or extremely similar statements , Preprocessing optimizes processing speed , I think the usage here should be ineffective 
    PREPARE stmt FROM @sql;
    EXECUTE stmt;
    --  Delete preprocessing 
    DEALLOCATE PREPARE stmt;
    SET v_maxdate = v_maxdate + INTERVAL 1 DAY; #  Maximum   Add one operation 
  END WHILE;
  
  --  Delete old partition 
  SELECT MIN(CAST(REPLACE(partition_description, '''', '') AS DATE)) AS val
  INTO   v_mindate
  FROM   INFORMATION_SCHEMA.PARTITIONS
  WHERE  TABLE_NAME = 't_partition_test' AND TABLE_SCHEMA = 'csl_test';
    
  --  Delete the old partition one year ago 
  WHILE v_mindate <= (v_sysdate - INTERVAL 1 YEAR) DO
    SET v_pt = DATE_FORMAT(v_mindate - INTERVAL 1 DAY,'%Y%m%d');
    SET @sql = CONCAT('alter table t_partition_test drop partition p', v_pt);
    PREPARE stmt FROM @sql;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
    SET v_mindate = v_mindate + INTERVAL 1 DAY;
  END WHILE;
 
END$$
--  Redefinition  MySQL To submit a query statement   End identification   by  ;
DELIMITER ;

# Call the stored procedure manually
call p_partition_test; # call p_partition_test();

# Open event
mysql The default is to turn off scheduled tasks

Check whether the timing task is on ,OFF It's not turned on ：

show variables like '%event_scheduler%';
-- perhaps
select @@event_scheduler;

Temporarily start scheduled tasks （ After reboot , The configuration will reply ）

set global event_scheduler = 1;

Permanent open , Modify the configuration file my.cnf,

event_scheduler=ON;

establish event event

delimiter $$
drop event if exists auto_pt $$
create event auto_pt
on schedule
-- every 1 minute
every 1 day
starts '2021-02-01 13:19:02'
do
BEGIN
    call p_partition_test();
END$$
delimiter ;

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