MYSQL表分區（二）

MYSQL表分區（一）

目錄

1.分區

2.分區定時任務：存儲過程與定時任務

1.存儲過程

2.創建 定時器計劃

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目的表：sp_program_playinfo

目的字段：create_time

主鍵 :id

表爲已創建表

查詢當前表是否存在分區

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

1.分區

執行修改分區語句會提示：1503 - A PRIMARY KEY must include all columns in the table's partitioning function

意思是 主鍵必須包含表的分區函數中的所有列，所以我們將該列改爲聯合主鍵。

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（） 參數爲目的列所產生的值，TO_DAYS（日期值）是mysql 函數：返回一個天數(從公元0年到目的值的天數);

PARTITION 分區名稱  VALUES LESS THAN (區間值) ENGINE = InnoDB,

由於我的表分區需要定時動態自增，所有上面的語句到了20190401以後就會出錯，因爲20190401以後的時間沒有分配到分區。如果需要進行完整分區可以加上

PARTITION pMaxValue VALUES LESS THAN MAXVALUE

2.分區定時任務：存儲過程與定時任務

1.存儲過程

CREATE DEFINER=`root`@`%` PROCEDURE `autoPartition`(IN table_name VARCHAR(64),OUT theSql VARCHAR(200))
BEGIN
# 目標分區數
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.創建 定時器計劃

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') ;