code: public static MappingInfo createMapingInfo(PK pk, Method method) {
          MappingInfo info = create(MappingInfo.class, method);
          info.annPK = pk;
          info.annColumn = method.getAnnotation(Column.class);
          info.annDefine = method.getAnnotation(ColDefine.class);
          info.annDefault = method.getAnnotation(Default.class);
          info.annId = method.getAnnotation(Id.class);
          info.annName = method.getAnnotation(Name.class);
          info.annNext = method.getAnnotation(Next.class);
          info.annPrev = method.getAnnotation(Prev.class);
          info.annReadonly = method.getAnnotation(Readonly.class);
          return info;
      }
docs: 根据 getter/setter 函数获取一个实体字段信息对象
  
  @param pk
  复合主键
  @param method
  方法：可能是 getter 或者是 setter
  @return 字段信息对象