mysql表分区例子

CREATE TABLE `students` (
`stu_id` int(11) NOT NULL AUTO_INCREMENT,
`stu_name` int(11) DEFAULT NULL,
`stu_sex` int(11) DEFAULT NULL,
`cla_id` int(11) DEFAULT NULL,
`stu_phone` char(11) DEFAULT NULL,
`create_time` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
PRIMARY KEY (`stu_id`,`create_time`)
)PARTITION BY RANGE (TO_DAYS(create_time))
(PARTITION p20150819 VALUES LESS THAN (736195))

CREATE PROCEDURE `createPart`()
BEGIN
DECLARE retrows int;
DECLARE pname varchar(64);
SET @a = 1;
WHILE @a <= 7 DO
set pname=REPLACE(concat('p',date(DATE_ADD(NOW(),INTERVAL @a DAY))),'-','');
select count(1) into retrows from `information_schema`.`PARTITIONS` where partition_name=pname and table_name='students';
if retrows=0 then
SET @SQL=CONCAT('ALTER TABLE students ADD PARTITION(','PARTITION ',REPLACE(concat('p',date(DATE_ADD(NOW(),INTERVAL @a DAY))),'-',''),' VALUES LESS THAN (',to_days(date_add(now(),interval @a+1 day)),'))');
PREPARE STMT FROM @SQL;
EXECUTE STMT;
DEALLOCATE PREPARE STMT;
end if;
SET @a = @a+1;
END WHILE;
END

CREATE PROCEDURE `dropPart`()
BEGIN
declare pname varchar(32);
declare retrows int;
SET @a = -2;
WHILE @a >= -7 DO
set pname=REPLACE(concat('p',date(DATE_ADD(NOW(),INTERVAL @a DAY))),'-','');
select count(1) into retrows from `information_schema`.`PARTITIONS` where partition_name=pname and table_name='students';
if retrows >0 then
SET @SQL=CONCAT('ALTER TABLE students drop PARTITION ',REPLACE(concat('p',date(DATE_ADD(NOW(),INTERVAL @a DAY))),'-',''));
PREPARE STMT FROM @SQL;
EXECUTE STMT;
DEALLOCATE PREPARE STMT;
end if;
SET @a = @a-1;
END WHILE;
end