MySQL批量生成测试数据函数

1.临时设置允许创建函数系统参数

set global log_bin_trust_function_creators=TRUE;

2.创建测试数据库

create database mytest charset=utf8;
 use mytest;

3.创建数据表

CREATE TABLE `test1` (
    `id` INT (11) NOT NULL AUTO_INCREMENT,
    `user_id` VARCHAR (20) 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;

4.创建随机字符串函数

delimiter $$
CREATE FUNCTION rand_string(n int) RETURNS varchar(255) 
begin        
  declare chars_str varchar(100) 
  default "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
  declare return_str varchar(255) default "";        
  declare i int default 0;
  while i < n do        
      set return_str=concat(return_str,substring(chars_str,floor(1+rand()*62),1));
      set i= i+1;        
  end while;        
  return return_str;    
end $$
delimiter;

5.创建存储过程

delimiter $$
CREATE  PROCEDURE `insert_data`(IN n int)
BEGIN  
  DECLARE i INT DEFAULT 1;
    WHILE (i <= n ) DO
      INSERT into test1 (user_id,group_id,create_time ) VALUEs (rand_string(20),FLOOR(RAND() * 100) ,now() );
            set i=i+1;
    END WHILE;
END $$
delimiter ;

6.调用存储过程, 插入数据

call insert_data(100000);

7.插入成功后, 可以快速创建其他数据表并插入大量数据

create table test2 engine=INNODB as select * from test1;