OEA体验：常用功能3 多对多关系

一、摘要

       在这里主要是写OEA设计方面的知识了。OEA 源码：OEA框架 2.9 Pre-Alpha 源码公布

可以到BloodyAngel的博客和中可以下到。虽然现在应经知道使用了，但是还是 需要了解框架相关知识运行机制，让我们更好的使用OEA进行开发。

二、本文大纲

       a、摘要 。

       b、UML图 （业务逻辑梳理，和父子关系的） 。

       c、项目结构，效果图  。

       d、OEA实现方法  。

三、UML图

这个图，我可是求高手求了好久才教我的 嘻嘻。

热点： 网关  设备 用户 小区

他们的关系是：

        网关下面有多个设备

        小区下面有多个用户

       用户下面有多个设备

       设备下面有多个 用户

他们的类图如下：

象下面这个图里面有个多对多，我们需要把它简化为这样的：这个是OEA提倡的分解关系

要用到OEA的外键，父子，界面扩展命令。

四、项目结构，效果图

  项目结构图：

     对应的数据库结构：

   效果图：

五、OEA实现方法

关联表的代码也是主代码了

  下面的代码主要是完成这个图啦

 1: // 设备 用户 关联表

 2: [ChildEntity, Serializable]

 3: public class UDAssociation : MyEntity

 4: {

 5:  public static readonly RefProperty<Device> DeviceRefProperty =

 6:  P<UDAssociation>.RegisterRef(e => e.Device, ReferenceType.Normal);

 7:  public int DeviceId

 8:  {

 9:  get { return this.GetRefId(DeviceRefProperty); }

10:  set { this.SetRefId(DeviceRefProperty, value); }

11:  }

12:  public Device Device

13:  {

14:  get { return this.GetRefEntity(DeviceRefProperty); }

15:  set { this.SetRefEntity(DeviceRefProperty, value); }

16:  }

17:  

18:  public static readonly RefProperty<HouseHold> HouseHoldRefProperty =

19:  P<UDAssociation>.RegisterRef(e => e.HouseHold, ReferenceType.Parent);

20:  public int HouseHoldId

21:  {

22:  get { return this.GetRefId(HouseHoldRefProperty); }

23:  set { this.SetRefId(HouseHoldRefProperty, value); }

24:  }

25:  public HouseHold HouseHold

26:  {

27:  get { return this.GetRefEntity(HouseHoldRefProperty); }

28:  set { this.SetRefEntity(HouseHoldRefProperty, value); }

29:  }

30:  

31:  #region 视图属性

32:  public static readonly Property<string> View_CodeProperty = P<UDAssociation>.RegisterReadOnly(e => e.View_Code, e => (e as UDAssociation).GetView_Code(), null);

33:  public string View_Code

34:  {

35:  get { return this.GetProperty(View_CodeProperty); }

36:  }

37:  private string GetView_Code()

38:  {

39:  return this.Device.Id.ToString();

40:  }

41:  

42:  public static readonly Property<string> View_NameProperty = P<UDAssociation>.RegisterReadOnly(e => e.View_Name, e => (e as UDAssociation).GetView_Name(), null);

43:  public string View_Name

44:  {

45:  get { return this.GetProperty(View_NameProperty); }

46:  }

47:  private string GetView_Name()

48:  {

49:  return this.Device.Name;

50:  }

51:  #endregion

52: 

53:  

54: }

55:  

一个设备对应多个用户

 1: // 一个设备对应多个用户

 2: [ChildEntity, Serializable]

 3: public class UDHouseHold : MyEntity

 4: {

 5:  public static readonly RefProperty<UDAssociation> UserDeviceRefProperty =

 6:  P<UDHouseHold>.RegisterRef(e => e.UDAssociation, ReferenceType.Parent);

 7:  public int UDAssociationId

 8:  {

 9:  get { return this.GetRefId(UserDeviceRefProperty); }

10:  set { this.SetRefId(UserDeviceRefProperty, value); }

11:  }

12:  public UDAssociation UDAssociation

13:  {

14:  get { return this.GetRefEntity(UserDeviceRefProperty); }

15:  set { this.SetRefEntity(UserDeviceRefProperty, value); }

16:  }

17:  public static readonly RefProperty<HouseHold> HouseHoldRefProperty =

18:  P<UDHouseHold>.RegisterRef(e => e.HouseHold, ReferenceType.Normal);

19:  public int HouseHoldId

20:  {

21:  get { return this.GetRefId(HouseHoldRefProperty); }

22:  set { this.SetRefId(HouseHoldRefProperty, value); }

23:  }

24:  public HouseHold HouseHold

25:  {

26:  get { return this.GetRefEntity(HouseHoldRefProperty); }

27:  set { this.SetRefEntity(HouseHoldRefProperty, value); }

28:  }

29:  

30:  #region 视ó图?属?性?

31:  

32:  public static readonly Property<string> View_CodeProperty = P<UDHouseHold>.RegisterReadOnly(e => e.View_Code, e => (e as UDHouseHold).GetView_Code(), null);

33:  public string View_Code

34:  {

35:  get { return this.GetProperty(View_CodeProperty); }

36:  }

37:  private string GetView_Code()

38:  {

39:  return HouseHold.Id.ToString();

40:  }

41:  

42:  public static readonly Property<string> View_NameProperty = P<UDHouseHold>.RegisterReadOnly(e => e.View_Name, e => (e as UDHouseHold).GetView_Name(), null);

43:  public string View_Name

44:  {

45:  get { return this.GetProperty(View_NameProperty); }

46:  }

47:  private string GetView_Name()

48:  {

49:  return HouseHold.Name;

50:  }

51:  

52:  #endregion

53: }

54:  

一个用户有多个设备

 1: // 一?个?用?户§有D多à个?设è备?

 2: [ChildEntity, Serializable]

 3: public class UDDevices : MyEntity

 4: {

 5:  public static readonly RefProperty<UDAssociation> UDAssociationRefProperty =

 6:  P<UDDevices>.RegisterRef(e => e.UDAssociation, ReferenceType.Parent);

 7:  public int UDAssociationId

 8:  {

 9:  get { return this.GetRefId(UDAssociationRefProperty); }

10:  set { this.SetRefId(UDAssociationRefProperty, value); }

11:  }

12:  public UDAssociation UDAssociation

13:  {

14:  get { return this.GetRefEntity(UDAssociationRefProperty); }

15:  set { this.SetRefEntity(UDAssociationRefProperty, value); }

16:  }

17:  public static readonly RefProperty<Device> DeviceRefProperty =

18:  P<UDDevices>.RegisterRef(e => e.Device, ReferenceType.Normal);

19:  public int DeviceId

20:  {

21:  get { return this.GetRefId(DeviceRefProperty); }

22:  set { this.SetRefId(DeviceRefProperty, value); }

23:  }

24:  public Device Device

25:  {

26:  get { return this.GetRefEntity(DeviceRefProperty); }

27:  set { this.SetRefEntity(DeviceRefProperty, value); }

28:  }

29: }

30:  

啥也不说了，直接下载源码看了。