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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 CREATE DEFINER = `root`@`%` PROCEDURE `Auto_Create_Partition`(IN `databaseName` varchar(50),IN `tableName` varchar(50))
 L_END:BEGIN
 # 初始化变量
 DECLARE MAX_PARTITION_DESCRIPTION VARCHAR(255) DEFAULT 0;
 DECLARE P_DESCRIPTION VARCHAR(255) DEFAULT 0;
 DECLARE i INT DEFAULT 1;
 DECLARE ISEXIST_PARTITION VARCHAR(255) DEFAULT 0;
 DECLARE next_p_name varchar(255) DEFAULT 0;
 # 查询表分区    最近的一个月的分区（ORDER BY partition_description DESC LIMIT 1）
 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 ; 

 IF ISEXIST_PARTITION <=> "" THEN
 SELECT "Partition table not is exist" AS "*****ERROR*****";
 LEAVE L_END;
 END IF;

 # 根据时间设置要创建的分区的名称
 SELECT concat('p',DATE_FORMAT(DATE_ADD(NOW(),INTERVAL 1 MONTH),'%Y%m')) INTO next_p_name; 

 # 判断要创建的分区是否存在
 IF ISEXIST_PARTITION = next_p_name THEN
 SELECT concat("Partition(",next_p_name,") is exist") AS "*****INFO*****";
 LEAVE L_END;
 END IF;

 # 最近一个分区的设置的最大值（右边界）
 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; 

 IF MAX_PARTITION_DESCRIPTION <=> "" THEN
 SELECT "Partition table is error" AS "*****ERROR*****";
 LEAVE L_END;
 END IF;

 # 创建新的分区
 # 1.设置新的分区的右边界值
 SET P_DESCRIPTION = TO_DAYS(DATE_FORMAT(DATE_ADD(NOW(),INTERVAL 2 MONTH),'%Y%m01'));
 # 2.拼接新增分区的SQL语句
 SET @S=CONCAT('ALTER TABLE ',tableName,' ADD PARTITION (PARTITION ',next_p_name,' VALUES LESS THAN (',P_DESCRIPTION,'))');
 SELECT @S;
 # 3.使用预处理执行SQL
 # ------------------------------------------------------------------------------------------
 # 语法：语法
 #     PREPARE statement_name FROM sql_text /*定义*/
 #     EXECUTE statement_name [USING variable [,variable...]] /*执行预处理语句*/
 #     DEALLOCATE PREPARE statement_name /*删除定义*/
 # ------------------------------------------------------------------------------------------
 PREPARE stmt2 FROM @S;
 EXECUTE stmt2;
 DEALLOCATE PREPARE stmt2;

 END L_END

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二.定时事件创建