一起谈.NET技术，NHibernate3剖析：Mapping篇之ConfORM实战(5):Component语义 狼人:

　　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：

　　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：

　　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：

　　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：

　　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