mysql 循环

DELIMITER $$
DROP PROCEDURE IF EXISTS student_insert_while;
$$
create procedure student_insert_while(in username varchar(45), in birthday date, in age int)
begin
    declare i int default 0;
    while i < 10 do
        insert into student (username, birthday, age) values(concat("abc", i), sysdate(), i);
        set i = i + 1;
    end while;
end;
$$

DELIMITER ;

DELIMITER $$
DROP PROCEDURE IF EXISTS student_insert_repeat;
$$
create procedure student_insert_repeat(in username varchar(45), in birthday date, in age int)
begin
    declare i int default 0;
    repeat
        insert into student (username, birthday, age) values(concat("abc", i), sysdate(), i);
        set i = i + 1;
        until i >= 5
    end repeat;
end;
$$

DROP PROCEDURE IF EXISTS student_insert_loop;
$$
create procedure student_insert_loop(in username varchar(45), in birthday date, in age int)
begin
    declare i int default 0;
    loop_label:loop
        insert into student (username, birthday, age) values(concat("abc", i), sysdate(), i);
        set i = i + 1;
        if i >= 5 then
            leave loop_label;
        end if;
    end loop;
end;
$$