MySQL函数查找两个日期之间的工作日数

CREATE FUNCTION `workdays`(start_date DATE, end_date DATE) RETURNS INT
BEGIN
  DECLARE cur_date DATE;
  DECLARE workdays INT DEFAULT 0;
  SET cur_date = start_date;
  WHILE cur_date <= end_date DO
    IF WEEKDAY(cur_date) NOT IN (5,6) THEN
      SET workdays = workdays + 1;
    END IF;
    SET cur_date = DATE_ADD(cur_date, INTERVAL 1 DAY);
  END WHILE;
  RETURN workdays;
END;

SELECT workdays('2022-01-01', '2022-01-31');