mysql 自定义函数

#获取job的时间详情
DROP FUNCTION IF EXISTS `get_job_actual_work_time`;
DELIMITER $$
CREATE FUNCTION `get_job_actual_work_time`(
    in_job_id char(50),
    in_action char(50)
) RETURNS INT(10)
BEGIN
      DECLARE out_times INT(10) DEFAULT 0;
      DECLARE in_job_id_2 char(50);
      DECLARE in_action_2 char(50);

      SET in_job_id_2 = CONCAT('"', in_job_id, '"');
      SET in_action_2 = CONCAT('"', in_action, '"');

      SELECT sum((case when end_time > 0 then end_time else unix_timestamp(now()) end) - start_time) AS job_times INTO out_times
      FROM t_worker_timeline WHERE job_id COLLATE=utf8mb4_unicode_ci=in_job_id_2 AND action COLLATE=utf8mb4_unicode_ci=in_action_2 AND status=1 GROUP BY job_id;

      RETURN (out_times);
END;
$$
DELIMITER ;