OEA框架学习:元数据设计

一、摘要

   

     目前的框架设计中,引入元数据(metadata)已经是必然的事情,元数据设计原则,EF元数据设计初了MSDN上的还有胡分享的EntityFramework 元数据 设计分析文章写的不错。目前行业提出的DSL(domain specific language)语言,更是把元数据话费得淋漓尽致啊。那OEA里面的元数据是什么样子的呢?!

   

二、OEA元数据架构图

   

看了一段时间的OEA了,这次我就给出我眼中的OEA元数据设计架构,大家如果对OEA感兴趣的可以看

http://www.cnblogs.com/zgynhqf

http://www.cnblogs.com/zhoujg

http://openexpressapp.codeplex.com

OEA中元数据的作用在那里呢?

元数据映射界面设计图

我们已经大致了解到OEA的元数据用在那了,那作者是如何设计的呢?

   

先给出MetaModel代码目录:

   

代码结构图:

元数据:

  1.        实体元数据
  2.        实体属性元数据  
  3.        实体显示元数据
  4.        实体显示属性元数据
  5.        属性元数据
  6.       子数据元数据
  7.  

在界面显示上有的属性是不需要显示的 那就需要用户自己进行配置那些可以显示,那些不需要显示。 OEA用的是XML的形式,它的设计如下:

   

XmlConfig 文件夹 主要就是解决客户化显示问题。

实体与元数据桥梁:

元数据编写规范:

[ChildEntity, Serializable]

public class HouseHold : MyEntity

{

/// <summary>

/// 门牌号

/// </summary>

public static readonly Property<string> HausnummerProperty = P<HouseHold>.Register(e => e.Hausnummer);

public string Hausnummer

{

get { return this.GetProperty(HausnummerProperty); }

set { this.SetProperty(HausnummerProperty, value); }

}

/// <summary>

/// 住户名称

/// </summary>

public static readonly Property<string> NameProperty = P<HouseHold>.Register(e => e.Name);

public string Name

{

get { return this.GetProperty(NameProperty); }

set { this.SetProperty(NameProperty, value); }

}

/// <summary>

/// 面积

/// </summary>

public static readonly Property<string> AreaProperty = P<HouseHold>.Register(e => e.Area);

public string Area

{

get { return this.GetProperty(AreaProperty); }

set { this.SetProperty(AreaProperty, value); }

}

/// <summary>

/// 楼层

/// </summary>

public static readonly Property<string> FloorProperty = P<HouseHold>.Register(e => e.Floor);

public string Floor

{

get { return this.GetProperty(FloorProperty); }

set { this.SetProperty(FloorProperty, value); }

}

 

#region 所属小区

public static readonly RefProperty<Village> VillageRefProperty =

P<HouseHold>.RegisterRef(e => e.Village, ReferenceType.Parent);

public int VillageId

{

get { return this.GetRefId(VillageRefProperty); }

set { this.SetRefId(VillageRefProperty, value); }

}

public Village Village

{

get { return this.GetRefEntity(VillageRefProperty); }

set { this.SetRefEntity(VillageRefProperty, value); }

}

#endregion

 

#region 设备列表

public static readonly ListProperty<UDAssociationList> UDAssociationListProperty = P<HouseHold>.RegisterList(e => e.UDAssociationList);

public UDAssociationList UDAssociationList

{

get { return this.GetLazyList(UDAssociationListProperty); }

}

#endregion

 

#region 民族

public static readonly RefProperty<Nation> NationRefProperty =

P<HouseHold>.RegisterRef(e => e.Nation, ReferenceType.Normal);

public int NationId

{

get { return this.GetRefId(NationRefProperty); }

set { this.SetRefId(NationRefProperty, value); }

}

public Nation Nation

{

get { return this.GetRefEntity(NationRefProperty); }

set { this.SetRefEntity(NationRefProperty, value); }

}

#endregion

}

根据Attributes属性编写的

[ChildEntity, Serializable]

public class HouseHold : MyEntity

{

#region Model

private string _name;

private int _monitoringAreaid;

[Column(Label="住户名称")]

public string Name

{

set { _name = value; }

get { return _name; }

}

 

[RefProperty(EntityType = typeof(MonitoringArea), ReferenceType = ReferenceType.Normal,Label="区域名称")]

public int MonitoringAreaId

{

set { _monitoringAreaid = value; }

get { return _monitoringAreaid; }

}

#endregion Model

}

   

元数据相关资料:

http://wenku.baidu.com/view/ee855cfa941ea76e58fa047b.html

http://blog.csdn.net/liwuqing7758/article/details/5688830

http://www.doc88.com/p-208751909019.html

http://wenku.baidu.com/view/8100a2335a8102d276a22f63.html

http://baike.baidu.com/view/624953.htm

   

原文地址:https://www.cnblogs.com/luomingui/p/3062212.html