Range分區(qū)表建表語(yǔ)句如下，其中分區(qū)鍵必須和id構(gòu)成主鍵和唯一鍵

CREATE TABLE `test1` (

`id` char(32) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT ‘自增主鍵(guid)‘,

`create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT ‘創(chuàng)建時(shí)間‘,

`partition_key` int(8) NOT NULL COMMENT ‘分區(qū)鍵(格式:yyyyMMdd)‘,

PRIMARY KEY (`id`,`partition_key`),

UNIQUE KEY `id_UNIQUE` (`id`,`partition_key`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci

PARTITION BY RANGE (partition_key)

(PARTITION p0 VALUES LESS THAN (20180619) ENGINE = InnoDB,

PARTITION p20180619 VALUES LESS THAN (20180620) ENGINE = InnoDB,

PARTITION p20180621 VALUES LESS THAN (20180622) ENGINE = InnoDB,

PARTITION p20180622 VALUES LESS THAN (20180623) ENGINE = InnoDB,

PARTITION p20180623 VALUES LESS THAN (20180624) ENGINE = InnoDB);

新增分區(qū)

alter TABLE `test1` add PARTITION(

PARTITION p20180629 VALUES LESS THAN (20180630) ENGINE = InnoDB

);

刪除分區(qū)

alter table `test1` drop PARTITION p20180629;

Mysql不能自動(dòng)創(chuàng)建分區(qū)，需要使用mysql event事件的方式自動(dòng)創(chuàng)建分區(qū)

1.創(chuàng)建分區(qū)的存儲(chǔ)過(guò)程如下(每次執(zhí)行先校驗(yàn)當(dāng)前分區(qū)是否存在，如果存在則不處理；不存在則創(chuàng)建)：

DELIMITER $$

#該表所在數(shù)據(jù)庫(kù)名稱

USE `demo`$$

DROP PROCEDURE IF EXISTS `create_partition_by_day`$$

CREATE PROCEDURE `create_partition_by_day`(IN_SCHEMANAME VARCHAR(64), IN_TABLENAME VARCHAR(64))

BEGIN

#當(dāng)前日期存在的分區(qū)的個(gè)數(shù)

DECLARE ROWS_CNT INT UNSIGNED;

#目前日期，為當(dāng)前日期的后一天

DECLARE TARGET_DATE TIMESTAMP;

#分區(qū)的名稱，格式為p20180620

DECLARE PARTITIONNAME VARCHAR(9);

#當(dāng)前分區(qū)名稱的分區(qū)值上限，即為 PARTITIONNAME + 1

DECLARE PARTITION_ADD_DAY VARCHAR(9);

SET TARGET_DATE = NOW() + INTERVAL 1 DAY;

SET PARTITIONNAME = DATE_FORMAT( TARGET_DATE, ‘p%Y%m%d‘ );

SET TARGET_DATE = TARGET_DATE + INTERVAL 1 DAY;

SET PARTITION_ADD_DAY = DATE_FORMAT( TARGET_DATE, ‘%Y%m%d‘ );

SELECT COUNT(*) INTO ROWS_CNT FROM information_schema.partitions

WHERE table_schema = IN_SCHEMANAME AND table_name = IN_TABLENAME AND partition_name = PARTITIONNAME;

IF ROWS_CNT = 0 THEN

SET @SQL = CONCAT( ‘ALTER TABLE `‘, IN_SCHEMANAME, ‘`.`‘, IN_TABLENAME, ‘`‘,

‘ ADD PARTITION (PARTITION ‘, PARTITIONNAME, " VALUES LESS THAN (",

PARTITION_ADD_DAY ,") ENGINE = InnoDB);" );

PREPARE STMT FROM @SQL;

EXECUTE STMT;

DEALLOCATE PREPARE STMT;

ELSE

SELECT CONCAT("partition `", PARTITIONNAME, "` for table `",IN_SCHEMANAME, ".", IN_TABLENAME, "` already exists") AS result;

END IF;

END$$

DELIMITER ;

2.數(shù)據(jù)庫(kù)定時(shí)任務(wù)(每小時(shí)執(zhí)行一次)

DELIMITER $$

#該表所在的數(shù)據(jù)庫(kù)名稱

USE `demo`$$

CREATE EVENT IF NOT EXISTS `daily_generate_partition`

ON SCHEDULE EVERY 1 hour #執(zhí)行周期，還有天、月等等

STARTS ‘2018-06-20 00:00:00‘

ON COMPLETION PRESERVE

ENABLE

COMMENT ‘Creating partitions‘

DO BEGIN

#調(diào)用剛才創(chuàng)建的存儲(chǔ)過(guò)程，第一個(gè)參數(shù)是數(shù)據(jù)庫(kù)名稱，第二個(gè)參數(shù)是表名稱

CALL datacollectcenter.create_partition_by_day(‘demo‘,‘test1‘);

END$$

DELIMITER ;

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