传入用户id查询连续签到天数

DROP FUNCTION IF EXISTS getTimes;
DELIMITER $$
CREATE FUNCTION getTimes(idstr VARCHAR(50))
RETURNS INT
BEGIN
DECLARE times INT;
DECLARE a INT;
DECLARE tempdt DATETIME;
DECLARE tempdt2 DATETIME;
SET times = 0;
SET a=1;
SELECT COUNT(*) INTO times FROM t_sys_member_sign WHERE TO_DAYS(NOW())-TO_DAYS(SIGN_TIME)<=0 AND id=idstr;
SELECT SIGN_TIME INTO tempdt FROM t_sys_member_sign WHERE TO_DAYS(NOW())-TO_DAYS(SIGN_TIME)=1 AND id=idstr;
WHILE tempdt IS NOT NULL AND a=1 DO
SET times=times+1;
SET tempdt2=tempdt;
SELECT SIGN_TIME INTO tempdt FROM t_sys_member_sign WHERE TO_DAYS(tempdt)-TO_DAYS(SIGN_TIME)=1 AND id=idstr;
IF TO_DAYS(tempdt2)-TO_DAYS(tempdt)<1 THEN SET a=0; END IF;
END WHILE;
RETURN times;
END$$
SELECT getTimes('009af8fe7c20431994098e044d36b058');