通用例如:功能NHibernate,多抽象基類繼承不加載中間基類
摘要映射類A. 摘要映射B類:(或任何你想要的)A,B的類型爲int的屬性 映射C類:A.
摘要映射類d具有A型 映射E類的屬性:D.具有B型
保存E至數據庫的屬性。檢索它並嘗試從E. 訪問B.int拋出「InvalidCastException的:無法轉換類型 'AProxy' 的目的爲類型 'B'
使用FluentNhibernate:1.3.0 Nhibernate的:3.2.0.4
實際剝離下來例如:
BaseTemplate表:
USE [DB]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [temp].[BaseTemplate](
[ID] [int] IDENTITY(1,1) NOT NULL,
CONSTRAINT [PK_BaseTemplate] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
MiddleTemplate表:
USE [DB]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [temp].[MiddleTemplate](
[ID] [int] NOT NULL,
[MiddleTemplateProperty] [int] NULL,
CONSTRAINT [PK_MiddleTemplate] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [temp].[MiddleTemplate] WITH CHECK ADD CONSTRAINT [FK_MiddleTemplate_BaseTemplate] FOREIGN KEY([ID])
REFERENCES [temp].[BaseTemplate] ([ID])
GO
ALTER TABLE [temp].[MiddleTemplate] CHECK CONSTRAINT [FK_MiddleTemplate_BaseTemplate]
GO
LastTemplate表:
USE [DB]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [temp].[LastTemplate](
[ID] [int] NOT NULL,
[LastTemplateProperty] [int] NULL,
CONSTRAINT [PK_LastTemplate] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [temp].[LastTemplate] WITH CHECK ADD CONSTRAINT [FK_LastTemplate_BaseTemplate] FOREIGN KEY([ID])
REFERENCES [temp].[BaseTemplate] ([ID])
GO
ALTER TABLE [temp].[LastTemplate] CHECK CONSTRAINT [FK_LastTemplate_BaseTemplate]
GO
BaseTemplateInstance表:
USE [DB]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [temp].[BaseTemplateInstance](
[ID] [int] IDENTITY(1,1) NOT NULL,
[TemplateID] [int] NOT NULL,
CONSTRAINT [PK_BaseTemplateInstance] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [temp].[BaseTemplateInstance] WITH CHECK ADD CONSTRAINT [FK_BaseTemplateInstance_BaseTemplate] FOREIGN KEY([TemplateID])
REFERENCES [temp].[BaseTemplate] ([ID])
GO
ALTER TABLE [temp].[BaseTemplateInstance] CHECK CONSTRAINT [FK_BaseTemplateInstance_BaseTemplate]
GO
LastTemplateInstance表:
USE [DB]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [temp].[LastTemplateInstance](
[ID] [int] NOT NULL,
CONSTRAINT [PK_LastTemplateInstance] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [temp].[LastTemplateInstance] WITH CHECK ADD CONSTRAINT [FK_LastTemplateInstance_BaseTemplateInstance] FOREIGN KEY([ID])
REFERENCES [temp].[BaseTemplateInstance] ([ID])
GO
ALTER TABLE [temp].[LastTemplateInstance] CHECK CONSTRAINT [FK_LastTemplateInstance_BaseTemplateInstance]
GO
類:
public abstract class BaseTemplate
public abstract class MiddleTemplate : BaseTemplate
{
public virtual int MiddleTemplateProperty { get; set; }
}
public class LastTemplate : MiddleTemplate
{
public virtual int LastTemplateProperty { get; set; }
}
public abstract class BaseTemplateInstance
{
public virtual BaseTemplate Template { get; set; }
protected BaseTemplateInstance() {}
protected BaseTemplateInstance(BaseTemplate template) : this()
{
Template = template;
}
}
public class LastTemplateInstance : BaseTemplateInstance
{
protected LastTemplateInstance() {}
public LastTemplateInstance(LastTemplate template)
:base(template) {}
public virtual int MiddleTemplateProperty { get { return ((MiddleTemplate) Template).MiddleTemplateProperty; } }
}
個
映射:
public class BaseTemplateMap : ClassMap<BaseTemplate>
{
public BaseTemplateMap()
{
Table("temp.BaseTemplate");
// Unique Identifier
Id(x => x.Id, "ID")
.GeneratedBy.Identity();
}
}
public class MiddleTemplateMap : SubclassMap<MiddleTemplate>
{
public MiddleTemplateMap()
{
Table("temp.MiddleTemplate");
KeyColumn("ID");
Map(x => x.MiddleTemplateProperty)
.Nullable();
}
}
public class LastTemplateMap : SubclassMap<LastTemplate>
{
public LastTemplateMap()
{
Table("temp.LastTemplate");
KeyColumn("ID");
Map(x => x.LastTemplateProperty)
.Nullable();
}
}
public class BaseTemplateInstanceMap : ClassMap<BaseTemplateInstance>
{
public BaseTemplateInstanceMap()
{
Table("temp.BaseTemplateInstance");
// Unique Identifier
Id(x => x.Id, "Id")
.GeneratedBy.Identity();
References(x => x.Template, "TemplateID")
.Not.Nullable();
}
}
public class LastTemplateInstanceMap : SubclassMap<LastTemplateInstance>
{
public LastTemplateInstanceMap()
{
Table("temp.LastTemplateInstance");
// Unique Identifier
KeyColumn("ID");
}
}
測試例:
[TestFixture]
internal class TempFileTests
{
#region Members
private LastTemplate _entity;
private MappingsRepository _repository;
#endregion // Members
#region SetUp
[TestFixtureSetUp]
public void SetUpFixture()
{
_repository = MappingsRepository.GetInstance();
}
[SetUp]
public void SetUp()
{
_entity = new LastTemplate();
}
#endregion // SetUp
#region Tests
[Test]
public void LastTemplateInstanceMappingsTest()
{
var lastTemplateInstance = new LastTemplateInstance(_entity);
_repository.Save(_entity);
lastTemplateInstance = new PersistenceSpecification<LastTemplateInstance>(_repository.CurrentSession)
.VerifyTheMappings(lastTemplateInstance);
var middleProperty = lastTemplateInstance.MiddleTemplateProperty;
}
#endregion // Tests
#region TearDown
[TearDown]
public void TearDown()
{
if (_entity != null && !_entity.IsNew())
_repository.Delete(_entity);
}
[TestFixtureTearDown]
public void TearDownFixture()
{
_repository.Dispose();
_repository = null;
}
#endregion // TearDown
}
'LastTemplateInstance.Template'在哪裏分配了一個''值? –
mxmissile
2014-09-19 14:50:54
LastTemplate是MiddleTemplate的類型。在LastTemplateInstance的構造函數中,我們傳遞了一個LastTemplate,你應該能夠將其轉換爲MiddleTemplate以獲取MiddleTemplateProperty。 – Seraph812 2014-09-19 15:13:34