redis 定义序列号

规则

# 举例  AA20201102NN1234567X
# 规则  [产品号2位]+[生成日期8位]+[内部品类号2位]+[序列号7位数字]+[校验码]
# 校验码生成规则
# a = 产品号
# b = 生成日期
# c = 产品批次/内部品类
# d = 生成序列号
# m = ( hash( a+b+c+d ) + d ) / 26
# 校验码等于 m 转成字符，值域 A~Z 0~9

链接redis使用

class SerialNumber(object):
    _key = None  # 自增ID key

    def __init__(self, product_code, batch):
        self.product_code = product_code
        self.batch = batch
        self.times = time.strftime("%Y%m%d", time.localtime(time.time()))
        self._key = f"{self.product_code}__{self.batch}__{self.times}"

    def get_serial_number(self):
        # 首先获取redis 自增ID
        redis_con = RedisCrease(self._key)
        incr_id = redis_con.get_crease_id()  # 自增ID
        # 序列号
        serial_num = self.product_code + self.times + self.batch + incr_id.zfill(7)
        # 加校验码
        m = hash(serial_num) + int(incr_id)
        # 计算校验码
        checks = divmod(m, 26)[1]
        if checks <= 9:
            check_str = str(checks)
        else:
            check_str = chr(checks + 55)

        return serial_num + check_str

    def check_serial_number(self, nums):
        # 校验序列号
        m = hash(nums[:-1]) + int(nums[12:-1])
        check = divmod(m, 26)[1]
        if check <= 9:
            checks = str(check)
        else:
            checks = str(check)
        return checks == nums[-1]


# if "__main__" == __name__:
#     sno = get_serial_number("RG", "SK")
#     print(sno)
#     is_check = check_serial_number(sno)
#     print(is_check)

# if "__main__" == __name__:
#     serial_obj = SerialNumber("RG", "SK")
#     sno = serial_obj.get_serial_number()
#     print(sno)
#     is_check = serial_obj.check_serial_number(sno)
#     print(is_check)