public class Post{
         public Member author
}

/*
    此对象由数据设计工具生成
*/
using System;
using System.Collections;
using System.Collections.Generic;
using Ufida.T.EAP.Domains;
using Ufida.T.EAP.Domains.Test;              

namespace Ufida.T.EAP.Domains.Test
{
    partial class Post
    {
        private object iDAuthor;
      /// <summary>
        /// iDAuthor  
      /// </summary>
        public object IDAuthor
      {
          get { return iDAuthor; }
        set {

            iDAuthor = value;
               
            }
      }
        private Member author;
      /// <summary>
      /// Member  关联关系对象
      /// </summary>
        public Member Author
      {
          get { return author; }
        set {

            author = value;
             
            }
      }
     

    }
}

------解决方案--------------------

AuthorID和author（实体）分别作为Member实体的两个属性
在author的Get里面对Author赋值，先判断this.AuthorID有没有值，有值就取出来给Author的赋值，没有就给赋null值

------解决方案--------------------
get 滴时候查询，晚加载。set早加载有点浪费

为了保证查询效率，逻辑内部需要维护一个db的视图。

不然每次get都重新执行一条sql语句都太不划算了