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();