Advanced familiarity with Mysql, using stored procedures and functions to generate test data with a specified number of rows

Create a test table

CREATE TABLE `test_num` (
  `id` bigint NOT NULL AUTO_INCREMENT,
  `age` int DEFAULT NULL,
  `rand_num` int DEFAULT NULL,
  `big_num` bigint DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `rand_age` (`rand_num`,`age`)
) ENGINE=InnoDB AUTO_INCREMENT=56393373 DEFAULT CHARSET=utf8mb3;

Create a function that randomly generates content

generate small numbers

CREATE FUNCTION `rand_min_num`() RETURNS int
begin        
  declare min_num INT(3);
	SET min_num = floor(rand()*100);
  return min_num;    
end

generate large numbers

CREATE FUNCTION `rand_max_num`() RETURNS bigint
begin        
  declare max_num BIGINT(10);
	SET max_num = floor(rand()*100000);
  return max_num;    
end

generate random characters

CREATE FUNCTION `rand_string`(n int) RETURNS varchar(255) CHARSET utf8mb3
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 a stored procedure and call it to generate the specified number of rows of data

Loop n ( n为入参) times, generate different data, and insert into the database

CREATE PROCEDURE `insert_data_testnum`( IN n INT )
BEGIN
	DECLARE i INT DEFAULT 1;
	DECLARE max_num BIGINT(10);
	DECLARE rand_num BIGINT(10);
	DECLARE min_num INT(5);
	WHILE(i<= n ) DO
		SET min_num = rand_min_num();
		SET rand_num = rand_max_num();
		SET max_num = rand_max_num();
		--循环执行以下插入语句
		INSERT INTO test_num ( age, rand_num,big_num ) VALUES(min_num,rand_num,max_num);
	  SET i = i + 1;
END WHILE;
END

Since our test table fields are all numeric types, the random data we use are all random numbers.

call stored procedure

-- 插入一条测试数据
CALL insert_data_testnum(1)

Check the database again, it has been inserted successfully. You can try to insert tens of millions of data, test sql optimization, etc...