6，生成预约订单号ID

admin

    @Override
    public int insertPetReservation(PetReservation petReservation)
    {
        petReservation.setCreateTime(DateUtils.getNowDate());
        petReservation.setUserId(getUserId());
//        petReservation.setReservationId(IdUtils.fastSimpleUUID());
        //获取当前日期时间
        LocalDateTime now = LocalDateTime.now();
        //定义格式器
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");
        //将日期时间格式化为字符串
        String formatDteTime = now.format(formatter);
        //将预约单号插入至预约对象中
        petReservation.setReservationId("OR" + formatDteTime + getUserId());
        return petReservationMapper.insertPetReservation(petReservation);
    }
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