Can anyone provide me with a web-link which describes attribute-based simple one-to-many mapping very clearly?
For example (A company can have only one country of origin. But there are many Companies in a Country):
class Company
{
}
class Country
{
IList<Company> Items;
}
For your example class, and using a bag for an unordered collection:
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; }
}
produces the following 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>
