//判断code是否重复
 LambdaQueryWrapper<ImgSetting> lambdaQueryWrapper = new LambdaQueryWrapper<>();
 //查询数据是否存在
  lambdaQueryWrapper.select(ImgSetting::getId);
  //查询code码是否已存在
  lambdaQueryWrapper.eq(ImgSetting::getCode, imgSetting.getCode());
//如果id不是空，代表修改
  if (!Func.isEmpty(imgSetting.getId())) {
  //去除自身数据的查询
      lambdaQueryWrapper.ne(ImgSetting::getId, imgSetting.getId());
  }
  //获取数据
  ImgSetting one = getOne(lambdaQueryWrapper);
  //不为空判代表已经存在
  if (!Func.isEmpty(one)) {
      throw new ServiceException("code已存在");
  }