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NHibernate3剖析:Mapping篇之ConfORM实战(5):Component语义

2010-10-03 13:46 by 李永京, ... 阅读, ... 评论, 收藏, 编辑

本节内容

系列引入

NHibernate3剖析系列分别从Configuration篇、Mapping篇、Session篇、Core篇、Tool篇、Practice篇、Extension篇等方面全面揭示NHibernate3版本内容、特性及其应用,完全基于NHibernte3版本。

ConfORM概述

ConfORM实战系列:

如果你不熟悉ConfORM请查看前几篇文章,你可以到http://code.google.com/p/codeconform/获取ConfORM最新版本。

Component语义

使用ConfORM“映射”组件,我们无需特别设置,ConfORM内部会根据Domain定义来判定组件,一般而言,没有主键的类就是组件。

[Test]
public void ComponentMappingDemo()
{
    //show how work with components and how ConfORM understands OOP
    var orm = new ObjectRelationalMapper();
    var mapper = new Mapper(orm);
    //use the definition of table-to-class strategy class by class
    orm.TablePerClass<Person>();
    // Show the mapping to the console
    var mapping = mapper.CompileMappingFor(new[] { typeof(Person) });
    Console.Write(mapping.AsString());
}

一些Domain范例

我们使用各种集合定义Domain:

1.Mapping a class with components

Person实体有两个组件:

public class Person
{
    public int Id { get; set; }
    public Name Name { get; set; }
    public Address Address { get; set; }
}

public class Name
{
    public string First { get; set; }
    public string Last { get; set; }
}
public class Address
{
    public string Street { get; set; }
    public int CivicNumber { get; set; }
}

Mapping

输出HbmMapping的映射字符串结果:

ClassWithComponents

2.Mapping a class with double usage of same component

在上面Domain的基础上新增一个Name类型的属性:

public class Person
{
    public int Id { get; set; }
    public Name Name { get; set; }
    public Name ShowBusinessAlias { get; set; }
    public Address Address { get; set; }
}

Mapping

输出HbmMapping的映射字符串结果:

ClassWithDoubleSameComponents

3.Collection of components

使用一个集合,而不是单一组件:

public class Person
{
    private Iesi.Collections.Generic.ISet<Address> addresses;
    public Person()
    {
        addresses = new Iesi.Collections.Generic.HashedSet<Address>();
    }
    public int Id { get; set; }
    public Name Name { get; set; }
    public ICollection<Address> Addresses { get { return addresses; } }
}

Mapping

输出HbmMapping的映射字符串结果:

CollectionOfComponents

4.Bidirectional relation

实现实体与组件的双向关联关系:

public class Person
{
    public int Id { get; set; }
    public Name Name { get; set; }
    public Name ShowBusinessAlias { get; set; }
    public Address Address { get; set; }
}
public class Name
{
    public Person Person { get; set; }
    public string First { get; set; }
    public string Last { get; set; }
}

Mapping

输出HbmMapping的映射字符串结果:

BidirectionalRelation

结语

这篇文章展示ConfORM的Components语义应用,映射了一些Domain示例。接下来继续介绍ConfORM。Are you ConfORM?

参考资料

Fabio Maulo:ConfORM:“Mapping” Components

希望本文对你有所帮助。