MySQL日志表按月分区

1.创建日志表

DROP TABLE IF EXISTS syslogs;
CREATE TABLE `syslogs` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `content` varchar(16) DEFAULT NULL,
  `ip` varchar(16) DEFAULT NULL,
  `createtime` datetime NOT NULL,
  PRIMARY KEY (`id`,`createtime`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2.测试数据

delimiter //
drop procedure if exists test_data;
create procedure test_data(IN num int )
begin
    declare v1 int default 0;
    declare ipVal varchar(50);
    declare timeVal varchar(50);
    declare contentVal varchar(50);
    declare exit handler for sqlexception rollback;
    start transaction;
    while v1 < num
    do
        set v1 = v1 +1;
        set ipVal = concat(round(1+rand()*254),'.',round(1+rand()*254),'.',round(1+rand()*254),'.',round(1+rand()*254));
        set contentVal = 'test';
        set timeVal = concat(round(2014 + rand()*2),'-',round(1 + rand()*11),'-',round(1 + rand()*27),' ',round(1+rand()*22),':',round(1+rand()*58),':',round(1+rand()*58));
        insert into syslogs(content,ip,createtime) values ('test',ipVal,timeVal);
    end while;
    delete from syslogs where createtime > now();
    commit;
end
//

3.日志表分区初始化

/*
 *初始化表分区
 *表没有数据，添加本月分区
 *表有数据，将所有数据按月分区
 @tableName 表名
 @columName 时间字段列名
*/
delimiter //
drop procedure if exists partitionInit;
create procedure partitionInit(IN tableName varchar(50),IN columName varchar(50))
begin
    set @s0 = concat('select max(',columName,') into @a from ',tableName);
    prepare stmt0 from @s0;
    execute stmt0;
    deallocate prepare stmt0;

    set @s1 = concat('select min(',columName,') into @b from ',tableName);
    prepare stmt1 from @s1;
    execute stmt1;
    deallocate prepare stmt1;

    set @maxDate = @a;
    set @minDate = @b;
    set @s2 = concat('alter table ',tableName,' partition by RANGE(to_days(',columName,'))(');

    set @endDate = now();
    if @minDate is null
    then set @minDate = @endDate;
         set @maxDate = @endDate;
    end if;
    set @minDate = date(date(@minDate)-day(@minDate)+1);
    set @maxDate = date(date(@maxDate)-day(@maxDate)+1);

    while to_days(@minDate)<to_days(@maxDate)
      do
      set @s2= concat(@s2,' PARTITION ',tableName,'_',date_format(@minDate,'%Y%m'),' VALUES less than (to_days("',date_add(@minDate,interval 1 month),'")),');
      set @minDate=  date_add(@minDate,interval 1 month);
    end while;

    set @s2=concat(@s2,' PARTITION ',tableName,'_',date_format(@minDate,'%Y%m'),' VALUES less than (to_days("',date_add(@minDate,interval 1 month),'")));');
    prepare stmt2 from @s2;
    execute stmt2;
    deallocate prepare stmt2;
end
//

4.添加次月分区

/*
 *添加下月表分区 前提：表已经分区过
 @tableName 表名
 @columName 时间字段列名
*/
delimiter //
drop procedure if exists partitionAdd;
create procedure partitionAdd(IN tableName varchar(50),IN columName varchar(50))
begin
    set @enddate = date_add(date(now())-day(now())+1,interval 2 month);
    set @s=concat('alter table ',tableName,' add partition (partition ',tableName,'_',date_format(date_add(date(now())-day(now())+1,interval 1 month),'%Y%m'),' VALUES less than (to_days("',@enddate,'")));');
    prepare stmt from @s;
    execute stmt;
    deallocate prepare stmt;
end
//

5.定时任务调度

CREATE EVENT autoPartition
    ON SCHEDULE
    EVERY 1 month
    DO
    call partitionAdd('syslogs','createtime');