转 https://blog.csdn.net/gooooa/article/details/54691590
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
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
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
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
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
INSERT into vote_record SELECT * from vote_record_memory
- 1
6、结果
原文地址:https://www.cnblogs.com/zxmbky/p/9567124.html
时间: 2024-10-05 09:28:54