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关于自连接
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菌哥  
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 More options Dec 8 2006, 8:55 am
From: "菌哥" <developer.vi...@gmail.com>
Date: Fri, 08 Dec 2006 05:55:54 -0800
Local: Fri, Dec 8 2006 8:55 am
Subject: 关于自连接
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一个表,比如
ID,ParentID
我现在让顶级ID的ParentID为空,请问Save如何做?
问题1:在定义的时候如果定义成 int?
ID,这样生成的实体类是错误的
问题2:既然不能定义int?,那么ID怎么能够为空呢?

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Teddy  
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 More options Dec 8 2006, 9:26 am
From: Teddy <shijie...@gmail.com>
Date: Fri, 8 Dec 2006 22:26:19 +0800
Local: Fri, Dec 8 2006 9:26 am
Subject: Re: 关于自连接
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ID可以定义成int,ParentID定义成int?就行了！

On 12/8/06, 菌哥 <developer.vi...@gmail.com> wrote:


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菌哥  
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 More options Dec 8 2006, 8:22 pm
From: "菌哥" <developer.vi...@gmail.com>
Date: Fri, 08 Dec 2006 17:22:24 -0800
Local: Fri, Dec 8 2006 8:22 pm
Subject: Re: 关于自连接
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不是说了吗,是自连接,应该比如是这样的:
public interface Node : Entity  //部门
{
        [PrimaryKey] //自身主键
     int ID { get;  set;}

    [FkReverseQuery]
    Node ParentID { get; set; }

}

这时ParentID是类型还是Node,既然是Node,
那么其ID又是主键,怎么可能设置为int?呢

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Teddy  
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 More options Dec 8 2006, 9:48 pm
From: Teddy <shijie...@gmail.com>
Date: Sat, 9 Dec 2006 10:48:52 +0800
Local: Fri, Dec 8 2006 9:48 pm
Subject: Re: 关于自连接
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*我说的就是自连接！！*

下面这样定义：

public interface Node : Entity  //部门
{
    [PrimaryKey] //自身主键
    int ID { get;  set;}

   [FkReverseQuery]
   Node ParentID { get; set; }

}

Parent对应的ParentID默认就是int?的。你不给它赋值他就是null。

Teddy

On 12/9/06, 菌哥 <developer.vi...@gmail.com> wrote:


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