How to use loops in MySQL stored procedure

CREATE PROCEDURE sum_nums_1_to_5()
BEGIN
    DECLARE sum INT DEFAULT 0;
    DECLARE counter INT DEFAULT 0;

    my_loop:
    LOOP
        # Initialize counter
        SET counter = counter + 1;

        # If counter is greater than 5, leave the loop
        IF counter > 5 THEN
            LEAVE my_loop;
        END IF;

        SET sum = sum + counter;
    END LOOP my_loop;

    SELECT sum;
END;

CALL sum_nums_1_to_5

create procedure add_user_to_all_vetted_companies(IN user_id int)begin    declare done int default 0;    declare company_id int;    declare company_ids varchar(255) default '';    declare cur cursor for select id from company where is_vetted = 1 order by name;    declare company_user_id int;    declare continue handler for not found set done = 1;    open cur;    repeat        fetch cur into company_id;        if not done then            set company_ids = concat(company_ids, company_id, ',');            insert into company_user (user_id, company_id, notify, created_at) values (user_id, company_id, 1, now());            set company_user_id = last_insert_id();            insert into company_user_role (company_user_id, role_id) values (company_user_id, 2);            insert into company_user_role_selected (company_user_id, role_id) values (company_user_id, 2);        end if;    until done end repeat;    close cur;    select company_ids;end;