NHibernate 简单的一对多映射使用 NHibernate.Mapping.Attributes

Question

谁能给我一个非常清楚地描述基于属性的简单一对多映射的网络链接？

例如(一家公司只能有一个国家，但一个国家有很多公司):

class Company
{
}

class Country
{
    IList<Company> Items;
}

Answer 1

对于您的示例类，并为无序集合使用包:

using Map = NHibernate.Mapping.Attributes;

[Map.Class( 0, Table = "country", NameType=typeof(Country) )]
public class Country
{
    [Map.Id( 1, Name = "Id" )]
    [Map.Generator( 2, Class = "identity" )]
    public virtual int Id { get; set; }
    [Map.Property]
    public virtual string Name { get; set; }
    [Map.Bag( 0, Table = "country_company" )]
    [Map.Key( 1, Column = "countryid" )]
    [Map.OneToMany( 2, ClassType = typeof( Company ) )]
    public virtual IList<Company> Items { get; set; } 
}

[Map.Class( 0, Table = "country_company", NameType = typeof( Company ) )]
public class Company
{
    [Map.Id( 1, Name = "Id" )]
    [Map.Generator( 2, Class = "identity" )]
    public virtual Guid Id { get; set; }
    [Map.Property]
    public virtual string Name { get; set; }
}

生成以下 hbm.xml:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
    <class name="nh.Country, nh" table="country">
        <id name="Id">
            <generator class="identity" />
        </id>
        <property name="Name" />
        <bag name="Items" table="country_company">
            <key column="countryid" />
            <one-to-many class="nh.Company, nh" />
        </bag>
    </class>
    <class name="nh.Company, nh" table="country_company">
        <id name="Id">
            <generator class="identity" />
        </id>
        <property name="Name" />
    </class>
</hibernate-mapping>