1、生成思路
利用mysql内存表插入速度快的特点,先利用函数和存储过程在内存表中生成数据,然后再从内存表插入普通表中
2、创建内存表及普通表
[sql] view plain copy
CREATE TABLE `vote_record_memory` (
`id` INT (11) NOT NULL AUTO_INCREMENT,
`user_id` VARCHAR (20) NOT NULL,
`vote_id` INT (11) NOT NULL,
`group_id` INT (11) NOT NULL,
`create_time` datetime NOT NULL,
PRIMARY KEY (`id`),
KEY `index_id` (`user_id`) USING HASH
) ENGINE = MEMORY AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8
CREATE TABLE `vote_record` (
`id` INT (11) NOT NULL AUTO_INCREMENT,
`user_id` VARCHAR (20) NOT NULL,
`vote_id` INT (11) NOT NULL,
`group_id` INT (11) NOT NULL,
`create_time` datetime NOT NULL,
PRIMARY KEY (`id`),
KEY `index_user_id` (`user_id`) USING HASH
) ENGINE = INNODB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8
3、创建函数及存储过程
[sql] view plain copy
- CREATE FUNCTION `rand_string`(n INT) RETURNS varchar(255) CHARSET latin1
- BEGIN
- DECLARE chars_str varchar(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
- DECLARE return_str varchar(255) DEFAULT '' ;
- DECLARE i INT DEFAULT 0;
- WHILE i < n DO
- SET return_str = concat(return_str,substring(chars_str , FLOOR(1 + RAND()*62 ),1));
- SET i = i +1;
- END WHILE;
- RETURN return_str;
- END
[sql] view plain copy
- CREATE PROCEDURE `add_vote_memory`(IN n int)
- BEGIN
- DECLARE i INT DEFAULT 1;
- WHILE (i <= n ) DO
- INSERT into vote_record_memory (user_id,vote_id,group_id,create_time ) VALUEs (rand_string(20),FLOOR(RAND() * 1000),FLOOR(RAND() * 100) ,now() );
- set i=i+1;
- END WHILE;
- END
4、调用存储过程
[sql] view plain copy
- CALL add_vote_memory(1000000)
根据电脑性能不能所花时间不一样,大概时间在小时级别,如果报错内存满了,只在修改max_heap_table_size 个参数即可,win7修改位置如下,linux,修改my.cnf文件,修改后要重启mysql,重启后内存表数据会丢失
5、插入普通表中
[sql] view plain copy
- INSERT into vote_record SELECT * from vote_record_memory