订单支付成功后存储过程 - MYSQL

BEGIN
    SET @userId = (SELECT user_id FROM t_shoporder WHERE id = orderId);
    /*修改订单状态，改成已支付*/
    UPDATE t_shoporder SET `status` = 1,update_time = NOW() WHERE id = orderId;
    /*查询用户是否已经学习改课程*/
    SET @count = (SELECT count(1) FROM t_course_user WHERE course_id = courseId AND user_id = @userId);
    IF @count = 0 THEN
        /*保存用户学习课程的记录*/
        INSERT INTO t_course_user (course_id, user_id, STATUS, finished) VALUES(courseId, @userId,1,0);
    END IF;

    /*检查该课程是否存在对应的班级*/
    SET @classId = (SELECT id FROM t_class WHERE course_id = courseId);
    /*如果存在就进行学习课程进入班级*/
    IF @classId = IS NOT NULL THEN
        /*检查学生是否已经加入到该班级了，如果是就不再加入*/
        SET @ccount = (SELECT COUNT(1) FROM t_classstudent WHERE class_id = @classId AND user_id = @userId);
        IF @ccount = 0 THEN
            /**将学生自动加入对应vip教室班级*/
            INSERT INTO t_classstudent(class_id, user_id, course_id,stuno) VALUES(@classId, @userId, courseId, CONCAT("ms_",DATE_FORMAT(NOW(),'%Y%m%d'),"_",courseId, "_"),?);
        END IF ;
        /*用户升级为vip和用户积分、等级的累加*/
        SET @type = (SELECT type FROM t_user WHERE id = @userId);
        /*学生升级权限*/
        IF @type = 1 THEN 
            UPDATE t_user SET type = 5,jifen = jifen + 100 WHERE id = @userId;
        ELSE
            UPDATE t_user SET jifen = jifen + 100 WHERE id = @userId;
        END IF;
        INSERT INTO t_user_jifen(
            user_id,
            score,
            description,
            type,
            mark
        )VALUES(
            @userId,
            100,
            '支付订单积分加+100分',
            1,
            1
        );
        SELECT @userId;
END