How mysql automatically generates large amounts of data

mysql automatically generates a large amount of data

In order to learn and verify high-performance mysql, a large amount of data is automatically generated for testing. The content comes from the Internet.

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Create random number generation

DELIMITER $$
CREATE DEFINER=`root`@`%` FUNCTION `random_num`( ) RETURNS int(5)
BEGIN   
 DECLARE i INT DEFAULT 0;  
 SET i = FLOOR(100+RAND()*10);  
RETURN i;  
 END$$
DELIMITER ;

Generate random string

DELIMITER $$
CREATE DEFINER=`root`@`%` FUNCTION `random_string`(n INT) RETURNS varchar(255) CHARSET latin1
BEGIN
 DECLARE chars_str VARCHAR(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFJHIJKLMNOPQRSTUVWXYZ';
 DECLARE return_str VARCHAR(255) DEFAULT '';
 DECLARE i INT DEFAULT 0;
 WHILE i < n DO
 SET return_str =CONCAT(return_str,SUBSTRING(chars_str,FLOOR(1+RAND()*52),1));
 SET i = i + 1;
 END WHILE;
 RETURN return_str;
END$$
DELIMITER ;

Generate random number , returns a varchar type data combination, such as mobile phone number

DELIMITER $$
CREATE DEFINER=`root`@`%` FUNCTION `random_string_phone`(n INT) RETURNS varchar(255) CHARSET latin1
BEGIN
 DECLARE chars_str VARCHAR(100) DEFAULT '1234567890';
 DECLARE return_str VARCHAR(255) DEFAULT '';
 DECLARE i INT DEFAULT 0;
 WHILE i < n DO
 SET return_str =CONCAT(return_str,SUBSTRING(chars_str,FLOOR(1+RAND()*10),1));
 SET i = i + 1;
 END WHILE;
 RETURN return_str;
END$$
DELIMITER ;

Create user table myisam engine

CREATE TABLE `sys_user_myisam` (
  `user_id` bigint(100) NOT NULL AUTO_INCREMENT,
  `username` varchar(100) DEFAULT NULL COMMENT '用户名',
  `password` varchar(100) DEFAULT NULL COMMENT '密码',
  `salt` varchar(100) DEFAULT NULL COMMENT '盐',
  `email` varchar(100) DEFAULT NULL COMMENT '邮箱',
  `mobile` varchar(100) DEFAULT NULL COMMENT '手机号',
  `status` int(1) DEFAULT '1' COMMENT '状态  0：禁用   1：正常',
  PRIMARY KEY (`user_id`)
) ENGINE=MyISAM AUTO_INCREMENT=1000001 DEFAULT CHARSET=utf8 COMMENT='系统用户MyISAM';

Create stored procedure to generate data

DELIMITER $$
CREATE DEFINER=`root`@`%` PROCEDURE `insert_sys_user_myisam`(IN START INT(10),IN max_num INT(10))
BEGIN  
DECLARE i INT DEFAULT 0;   
 SET autocommit = 0;    
 REPEAT  
 SET i = i + 1;  
 INSERT INTO sys_user_myisam (user_id,username,password,salt,email,mobile,status) VALUES (START+i,random_string(10),random_string(6),random_string(10),random_string(20),random_string_phone(12),1);  
 UNTIL i = max_num  
 END REPEAT;  
 COMMIT;  
 END$$
DELIMITER ;

Create table innodb engine

create table sys_user_innodb ENGINE=MyISAM AUTO_INCREMENT=1000001 DEFAULT CHARSET=utf8 as select * from sys_user_myisam;

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