DELIMITER $$
USE `dw`$$
DROP PROCEDURE IF EXISTS `sp_tool_maintain_partition`$$
CREATE DEFINER=`data`@`%` PROCEDURE `sp_tool_maintain_partition`(in_tabName VARCHAR(68),in_startDate DATE,in_endDate DATE)
BEGIN
/******************************************************************
* Procedure Name: sp_tool_maintain_partition
* Parameter:
* Creator:
* Create Date: 2015-08-14
* Description: 维护一个表的分区
* Warning :
* 必须建一个最大分区pmax
* /*限制了一次最多只能删除3个分区*/
* 仅适用于RANGE COLUMNS(atdate) 按日分区
* Version: 1.0
******************************************************************/
DECLARE maxpdate DATE;
DECLARE minpdate DATE;
DECLARE pdate DATE;
DECLARE var_cou,i TINYINT DEFAULT 0;
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
BEGIN
#获得异常信息
GET DIAGNOSTICS @cno = NUMBER;
GET DIAGNOSTICS CONDITION @cno @mysql_error = MYSQL_ERRNO,@msg_text = MESSAGE_TEXT,@sql_state = returned_sqlstate;
IF @mysql_error IS NOT NULL AND @msg_text IS NOT NULL THEN
#日志变量初始化发生异常
SET @log_type=0;
SET @msg_exception=CONCAT('error_no:',@mysql_error,' sql_state:',@sql_state,' error_text:',@msg_text);
END IF;
#存储异常信息
CALL sp_write_error('dw.sp_tool_maintain_partition',@sql_state,@mysql_error,@msg_text,CONCAT("in_tabName =",in_tabName ,"in_startDate=",in_startDate,'in_endDate=',in_endDate));
END;
first_lable:BEGIN
SET var_cou=0;
SELECT COUNT(*) INTO var_cou
FROM INFORMATION_SCHEMA.PARTITIONS
WHERE TABLE_SCHEMA='dw' AND `table_name`=in_tabName AND partition_name='pmax';
IF var_cou =0 THEN
SELECT CONCAT(in_tabName,' pmax 分区找不到,推出循环');
LEAVE first_lable;
END IF;
#获取当前最大分区和最小分区
SELECT DATE(MAX(RIGHT(PARTITION_NAME,8))),DATE(MIN(RIGHT(PARTITION_NAME,8))) INTO maxpdate,minpdate
FROM INFORMATION_SCHEMA.PARTITIONS
WHERE TABLE_SCHEMA='dw' AND `table_name`=in_tabName AND partition_name!='pmax';
#增加分区逻辑，in_endDate用来增加分区到指定日期
IF(in_endDate>maxpdate) THEN
SET pdate=maxpdate;
SET @sqlStat=CONCAT('ALTER TABLE ',in_tabName,' REORGANIZE PARTITION pmax INTO(');
WHILE pdate<in_endDate DO
SET pdate=DATE_ADD(pdate,INTERVAL 1 DAY);
SET @sqlStat=CONCAT(@sqlStat,'PARTITION p',DATE(pdate)+0,' VALUES LESS THAN (''',DATE_ADD(pdate,INTERVAL 1 DAY),'''),');
END WHILE;
SET @sqlStat=CONCAT(@sqlStat,'PARTITION pmax VALUES LESS THAN (MAXVALUE))');
PREPARE stmt FROM @sqlStat;
SELECT @sqlStat;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END IF;
#删除分区逻辑，in_startDate用来删除分区到指定日期，i逻辑用来限制一次最多只删除3个分区。
IF(in_startDate>minpdate AND i<3) THEN
SET pdate=minpdate;
WHILE pdate<in_startDate DO
SET @sqlStat=CONCAT('ALTER TABLE ',in_tabName,' DROP PARTITION p',DATE(pdate)+0);
PREPARE stmt FROM @sqlStat;
EXECUTE stmt;
SELECT @sqlStat;
DEALLOCATE PREPARE stmt;
SET pdate=DATE_ADD(pdate,INTERVAL 1 DAY);
SET i=i+1;
END WHILE;
END IF;
END first_lable;
END$$
DELIMITER ;
