code: public void setMapperProperties(Environment environment) {
          Config config = SpringBootBindUtil.bind(environment, Config.class, Config.PREFIX);
          if (mapperHelper == null) {
              mapperHelper = new MapperHelper();
          }
          if(config != null){
              mapperHelper.setConfig(config);
          }
      }
docs: 从环境变量中获取 mapper 配置信息
  
  @param environment