MYSQL定时创建表分区

MYSQL定时创建表分区

一.存储过程-表分区
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需求：
每月创建一个分区
分区名名称格式:p201201,p201202……
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 1 CREATE DEFINER = `root`@`%` PROCEDURE `Auto_Create_Partition`(IN `databaseName` varchar(50),IN `tableName` varchar(50))

 2 L_END:BEGIN 

 3 # 初始化变量

 4 DECLARE MAX_PARTITION_DESCRIPTION VARCHAR(255) DEFAULT 0; 

 5 DECLARE P_DESCRIPTION VARCHAR(255) DEFAULT 0; 

 6 DECLARE i INT DEFAULT 1; 

 7 DECLARE ISEXIST_PARTITION VARCHAR(255) DEFAULT 0; 

 8 DECLARE next_p_name varchar(255) DEFAULT 0;

 9 # 查询表分区    最近的一个月的分区（ORDER BY partition_description DESC LIMIT 1）    

10 SELECT PARTITION_NAME INTO ISEXIST_PARTITION FROM information_schema.PARTITIONS WHERE TABLE_SCHEMA = databaseName AND TABLE_NAME = tableName ORDER BY partition_description DESC LIMIT 1 ; 

11 

12 IF ISEXIST_PARTITION <=> "" THEN 

13 SELECT "Partition table not is exist" AS "*****ERROR*****"; 

14 LEAVE L_END; 

15 END IF;

16 

17 # 根据时间设置要创建的分区的名称

18 SELECT concat('p',DATE_FORMAT(DATE_ADD(NOW(),INTERVAL 1 MONTH),'%Y%m')) INTO next_p_name; 

19 

20 # 判断要创建的分区是否存在

21 IF ISEXIST_PARTITION = next_p_name THEN

22 SELECT concat("Partition(",next_p_name,") is exist") AS "*****INFO*****"; 

23 LEAVE L_END; 

24 END IF;

25 

26 # 最近一个分区的设置的最大值（右边界）

27 SELECT partition_description INTO MAX_PARTITION_DESCRIPTION FROM information_schema.PARTITIONS WHERE TABLE_SCHEMA = databaseName AND TABLE_NAME = tableName ORDER BY partition_description DESC LIMIT 1; 

28 

29 IF MAX_PARTITION_DESCRIPTION <=> "" THEN 

30 SELECT "Partition table is error" AS "*****ERROR*****"; 

31 LEAVE L_END; 

32 END IF;

33 

34 # 创建新的分区

35 # 1.设置新的分区的右边界值

36 SET P_DESCRIPTION = TO_DAYS(DATE_FORMAT(DATE_ADD(NOW(),INTERVAL 2 MONTH),'%Y%m01')); 

37 # 2.拼接新增分区的SQL语句

38 SET @S=CONCAT('ALTER TABLE ',tableName,' ADD PARTITION (PARTITION ',next_p_name,' VALUES LESS THAN (',P_DESCRIPTION,'))'); 

39 SELECT @S;

40 # 3.使用预处理执行SQL

41 # ------------------------------------------------------------------------------------------

42 # 语法：语法 

43 #     PREPARE statement_name FROM sql_text /*定义*/ 

44 #     EXECUTE statement_name [USING variable [,variable...]] /*执行预处理语句*/ 

45 #     DEALLOCATE PREPARE statement_name /*删除定义*/ 

46 # ------------------------------------------------------------------------------------------

47 PREPARE stmt2 FROM @S;

48 EXECUTE stmt2;

49 DEALLOCATE PREPARE stmt2;

50 

51 END L_END

 

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二.定时事件创建