MYSQL表分区（二）

MYSQL表分区（一）

目录

1.分区

2.分区定时任务：存储过程与定时任务

1.存储过程

2.创建 定时器计划

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目的表：sp_program_playinfo

目的字段：create_time

主键 :id

表为已创建表

查询当前表是否存在分区

SELECT
	partition_name 
FROM
	information_schema.PARTITIONS 
WHERE
	table_schema = SCHEMA ( ) 
	AND table_name = 'sp_program_playinfo' 
	AND partition_name LIKE 'p2019%';;

1.分区

执行修改分区语句会提示：1503 - A PRIMARY KEY must include all columns in the table's partitioning function

意思是 主键必须包含表的分区函数中的所有列，所以我们将该列改为联合主键。

alter TABLE `sp_program_playinfo` PARTITION BY RANGE (TO_DAYS(create_time))
(
 PARTITION p20180601 VALUES LESS THAN (TO_DAYS('20180601')) ENGINE = InnoDB,
 PARTITION p20180701 VALUES LESS THAN (TO_DAYS('20180701')) ENGINE = InnoDB,
 PARTITION p20180801 VALUES LESS THAN (TO_DAYS('20180801')) ENGINE = InnoDB,
 PARTITION p20180901 VALUES LESS THAN (TO_DAYS('20180901')) ENGINE = InnoDB,
 PARTITION p20181001 VALUES LESS THAN (TO_DAYS('20181001')) ENGINE = InnoDB,
 PARTITION p20181101 VALUES LESS THAN (TO_DAYS('20181101')) ENGINE = InnoDB,
 PARTITION p20181201 VALUES LESS THAN (TO_DAYS('20181201')) ENGINE = InnoDB,
 PARTITION p20190101 VALUES LESS THAN (TO_DAYS('20190101')) ENGINE = InnoDB,
 PARTITION p20190201 VALUES LESS THAN (TO_DAYS('20190201')) ENGINE = InnoDB,
 PARTITION p20190301 VALUES LESS THAN (TO_DAYS('20190301')) ENGINE = InnoDB,
 PARTITION p20190401 VALUES LESS THAN (TO_DAYS('20190401')) ENGINE = InnoDB
);

Range（） 参数为目的列所产生的值，TO_DAYS（日期值）是mysql 函数：返回一个天数(从公元0年到目的值的天数);

PARTITION 分区名称  VALUES LESS THAN (区间值) ENGINE = InnoDB,

由于我的表分区需要定时动态自增，所有上面的语句到了20190401以后就会出错，因为20190401以后的时间没有分配到分区。如果需要进行完整分区可以加上

PARTITION pMaxValue VALUES LESS THAN MAXVALUE

2.分区定时任务：存储过程与定时任务

1.存储过程

CREATE DEFINER=`root`@`%` PROCEDURE `autoPartition`(IN table_name VARCHAR(64),OUT theSql VARCHAR(200))
BEGIN
# 目标分区数
DECLARE target_PCount INT DEFAULT -1;

DECLARE newPName VARCHAR(21);

DECLARE target_Date TIMESTAMP;

SET target_Date = DATE_ADD(CURRENT_DATE(),INTERVAL 1 DAY);

SET newPName = DATE_FORMAT( target_Date, 'p%Y%m%d' );

 select COUNT(1) c INTO target_PCount from information_schema.partitions where table_schema = schema() and table_name= table_name AND partition_name =  newPName;

IF target_PCount <= 0 THEN

	SET @createPartitonSQL = CONCAT('ALTER TABLE ',table_name,' add PARTITION( PARTITION ' , newPName,
	' VALUES LESS THAN (TO_DAYS("', target_Date , '")) ENGINE = InnoDB);' );

		PREPARE STMT FROM @createPartitonSQL;
		EXECUTE STMT;
		DEALLOCATE PREPARE STMT;

	SELECT @createPartitonSQL INTO theSql;

END IF;

END

2.创建 定时器计划

create EVENT `PartitionTest`.`autoCreatePartition_sp_program_playinfo`
ON SCHEDULE
EVERY '7' WEEK STARTS '2019-01-01 00:00:00'
DO call createPartition('sp_program_playinfo') ;