MYSQL-- 每半月一个分区，自动维护

建表语句

drop table if exists terminal_parameter;
CREATE TABLE `terminal_parameter` (
  `terminal_parameter_id` int(11) NOT NULL AUTO_INCREMENT,
  `serial` int(11) DEFAULT NULL,
  `network_type` char(1) DEFAULT NULL,
  `mcc` int(8) DEFAULT NULL,
  `mnc` int(8) DEFAULT NULL,
  `lac` int(8) DEFAULT NULL,
  `cellid` int(8) DEFAULT NULL,
  `bsic_psc` int(8) DEFAULT NULL,
  `ta_ec_io` int(8) DEFAULT NULL,
  `bcch_rxlev_rscp` int(8) DEFAULT NULL,
  `arfcn_uarfcn` int(8) DEFAULT NULL,
  `rxq` int(8) DEFAULT NULL,
  `c1` int(8) DEFAULT NULL,
  `c2` int(8) DEFAULT NULL,
  `signal_intensity` int(8) DEFAULT NULL,
  `error_rate` int(8) DEFAULT NULL,
  `alarm_type` varchar(16) DEFAULT NULL,
  `txpower` int(8) DEFAULT NULL,
  `small_running_number` int(8) DEFAULT NULL,
  `createtime` datetime NOT NULL,
  `userid` int(8) NOT NULL,
  `terminal_id` int(8) DEFAULT NULL,
  `state` char(1) DEFAULT '0',
  `order_definition_id` int(8) DEFAULT NULL,
  `order_code` varchar(20) DEFAULT NULL,
  `charg_voltage` float(8,2) DEFAULT NULL,
  `battery_voltage` float(8,2) DEFAULT NULL,
  `temprad` float(8,2) DEFAULT NULL,
  `run_state` int(8) DEFAULT NULL,
  `switching_value1` int(8) DEFAULT NULL,
  `switching_value2` int(8) DEFAULT NULL,
  `bcch_freq` int(8) DEFAULT NULL,
  `rxlev` int(8) DEFAULT NULL,
  `rxlev_full` int(8) DEFAULT NULL,
  `rxlev_sub` int(8) DEFAULT NULL,
  `rxqual` int(8) DEFAULT NULL,
  `rxqual_full` int(8) DEFAULT NULL,
  `rxqual_sub` int(8) DEFAULT NULL,
  `idle_ts` int(8) DEFAULT NULL,
  `timing_advance` int(8) DEFAULT NULL,
  `tch_efr_out` int(8) DEFAULT NULL,
  `tch_efr_in` int(8) DEFAULT NULL,
  `dtx` int(8) DEFAULT NULL,
  `major_cycle_frequency` int(8) DEFAULT NULL,
  PRIMARY KEY (`terminal_parameter_id`,`createtime`),
  KEY `idx_createtime` (`createtime`),
  KEY `idx_terminal_id` (`terminal_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
PARTITION BY RANGE(TO_DAYS (createtime))
(
PARTITION p20101115 VALUES LESS THAN (TO_DAYS('2010-11-15')),
PARTITION p20101130 VALUES LESS THAN (TO_DAYS('2010-11-30')),
PARTITION p20101215 VALUES LESS THAN (TO_DAYS('2010-12-15')),
PARTITION p20101231 VALUES LESS THAN (TO_DAYS('2010-12-31')),
PARTITION p20110115 VALUES LESS THAN (TO_DAYS('2011-01-15')),
PARTITION p20110131 VALUES LESS THAN (TO_DAYS('2011-01-31')),
PARTITION p20110215 VALUES LESS THAN (TO_DAYS('2011-02-15')),
PARTITION p20110228 VALUES LESS THAN (TO_DAYS('2011-02-28')),
PARTITION p20110315 VALUES LESS THAN (TO_DAYS('2011-03-15')),
PARTITION p20110331 VALUES LESS THAN (TO_DAYS('2011-03-31')),
PARTITION p20110415 VALUES LESS THAN (TO_DAYS('2011-04-15')),
PARTITION p20110430 VALUES LESS THAN (TO_DAYS('2011-04-30'))
);


存储过程代码：

* 每隔15天执行一次
/* 程序功能：循环使用分区，每半个月一个分区，保留6个月的数据
时间：2010-11-09 */
drop procedure if exists Set_Partition;
create procedure Set_Partition()
begin
/* 事务回滚，其实放这里没什么作用，ALTER TABLE是隐式提交，回滚不了的。*/
    declare exit handler for sqlexception rollback;
    start TRANSACTION;

/* 到系统表查出这个表的最大分区，得到最大分区的日期。在创建分区的时候，名称就以日期格式存放，方便后面维护 */
    select REPLACE(partition_name,'p','') into @P12_Name from INFORMATION_SCHEMA.PARTITIONS where TABLE_SCHEMA='mydb_1' and table_name='terminal_parameter' order by partition_ordinal_position DESC limit 1;

/* 判断最大分区的时间段，如果是前半个月的，那么根据情况需要加13,14,15,16天
   如果是后半个月的，那么直接加15天。 +0 是为了把日期都格式化成YYYYMMDD这样的格式*/
    IF (DAY(@P12_Name)<=15) THEN
       CASE day(LAST_DAY(@P12_name))
          WHEN 31 THEN set @Max_date= date(DATE_ADD(@P12_Name+0,INTERVAL 16 DAY))+0 ;
          WHEN 30 THEN set @Max_date= date(DATE_ADD(@P12_Name+0,INTERVAL 15 DAY))+0 ;
          WHEN 29 THEN set @Max_date= date(DATE_ADD(@P12_Name+0,INTERVAL 14 DAY))+0 ;
          WHEN 28 THEN set @Max_date= date(DATE_ADD(@P12_Name+0,INTERVAL 13 DAY))+0 ;
       END CASE;
    ELSE
       set @Max_date= date(DATE_ADD(@P12_Name+0, INTERVAL 15 DAY))+0;
    END IF;

/* 修改表，在最大分区的后面增加一个分区，时间范围加半个月 */
    SET @s1=concat('ALTER TABLE terminal_parameter ADD PARTITION (PARTITION p',@Max_date,' VALUES LESS THAN (TO_DAYS (''',date(@Max_date),''')))');
    PREPARE stmt2 FROM @s1;
    EXECUTE stmt2;
    DEALLOCATE PREPARE stmt2;

/* 取出最小的分区的名称，并删除掉 。
    注意：删除分区会同时删除分区内的数据，慎重 */
    select partition_name into @P0_Name from INFORMATION_SCHEMA.PARTITIONS where TABLE_SCHEMA='mydb_1' and table_name='terminal_parameter' order by partition_ordinal_position limit 1;
    SET @s=concat('ALTER TABLE terminal_parameter DROP PARTITION ',@P0_Name);
    PREPARE stmt1 FROM @s;
    EXECUTE stmt1;
    DEALLOCATE PREPARE stmt1;

/* 提交 */
    COMMIT ;
end;



计划任务代码：

CREATE EVENT e_Set_Partition
          ON SCHEDULE
          EVERY 15 day STARTS '2011-04-30 23:59:59'
          DO
          call Set_Partition();



建表语句：
drop table if exists ods_sys_visit_log;
CREATE TABLE `ods_sys_visit_log` (
  `accesstime` timestamp,
  `etltime` datetime DEFAULT NULL,
  KEY `idx_ods_sys_visit_log_lookup` (`accesstime`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8
PARTITION BY RANGE(UNIX_TIMESTAMP(accesstime))
(
PARTITION p20140501 VALUES LESS THAN (UNIX_TIMESTAMP('2014-05-02')),
PARTITION p20140502 VALUES LESS THAN (UNIX_TIMESTAMP('2014-05-03'))
);
自己的业务需要写了个存储过程，这里记录下:

DROP PROCEDURE IF EXISTS set_table_partition;

delimiter $$

CREATE DEFINER=`push_user`@`%` PROCEDURE `set_table_partition`(tableSchema VARCHAR(100), tableName VARCHAR(100))
BEGIN
/* 事务回滚，其实放这里没什么作用，ALTER TABLE是隐式提交，回滚不了的。*/
    DECLARE i INT;
    DECLARE EXIT HANDLER FOR SQLEXCEPTION ROLLBACK;
    START TRANSACTION;

/* 到系统表查出这个表的最大分区，得到最大分区的日期。在创建分区的时候，名称就以日期格式存放，方便后面维护 */
SELECT
REPLACE(partition_name, 'p', '')
INTO @P12_NAME FROM
INFORMATION_SCHEMA.PARTITIONS
WHERE
TABLE_SCHEMA = tableSchema
AND table_name = tableName
ORDER BY partition_ordinal_position DESC
LIMIT 1;

    SET i=DATE_FORMAT(NOW(), '%Y%m%d');
    WHILE i>@P12_NAME DO
SET @MAX_DATE= DATE(DATE_ADD(@P12_NAME+0, INTERVAL 1 DAY))+0;

/* 修改表，在最大分区的后面增加一个分区，时间为一天 */
SET @TEMP=CONCAT('ALTER TABLE ',tableName,' ADD PARTITION (PARTITION p',@MAX_DATE,' VALUES LESS THAN (UNIX_TIMESTAMP (''',DATE(@MAX_DATE+1),''')))');
PREPARE stmt FROM @TEMP;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SELECT
REPLACE(partition_name, 'p', '')
INTO @P12_NAME FROM
INFORMATION_SCHEMA.PARTITIONS
WHERE
TABLE_SCHEMA = tableSchema
AND table_name = tableName
ORDER BY partition_ordinal_position DESC
LIMIT 1;

END WHILE;


/* 提交 */
    COMMIT ;
END$$