DROP PROCEDURE IF EXISTS insert_Stu;
DELIMITER $$
CREATE PROCEDURE insert_Stu(IN max_num INT(10))
BEGIN
DECLARE i INT DEFAULT 0;
REPEAT
SET i = i + 1;
INSERT INTO student (name, age, live) VALUES (rand_string(3), rand_num(), rand_string(6));
UNTIL i = max_num
END REPEAT;
COMMIT;
END $$
DROP PROCEDURE IF EXISTS rand_string;
DELIMITER $$
CREATE FUNCTION rand_string(n INT) RETURNS VARCHAR(255)
BEGIN
DECLARE chars_str VARCHAR(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFJHIJKLMNOPQRSTUVWXYZ';
DECLARE return_str VARCHAR(255) DEFAULT '';
DECLARE i INT DEFAULT 0;
WHILE i < n DO
SET return_str = CONCAT(return_str, SUBSTRING(chars_str, FLOOR(1 + RAND() * 52), 1));
SET i = i + 1;
END WHILE;
RETURN return_str;
END $$;
DROP PROCEDURE IF EXISTS rand_num;
DELIMITER $$
CREATE FUNCTION rand_num()
RETURNS INT(5)
BEGIN
DECLARE i INT DEFAULT 0;
SET i = FLOOR(100 + RAND() * 10);
RETURN i;
END $$
;
call insert_Stu(1000000);
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