使用nhibernate.mapping.attributes进行简单的一对多映射

对于您的示例类,并将包用于无序集合:

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>