我是迈克尔引用的文章的作者。我不知道人们仍然感兴趣,我不确定它是否适用于最新的 NHibernate。这是一个新的链接:http: //thoughtspam.wordpress.com/2007/12/19/nhibernate-property-with-formula/
例如,使用北风...
映射:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="PropertyFormulaExample.Shipper, PropertyFormulaExample" table="Shippers" lazy="false" >
<id name="ShipperID" column="ShipperID" unsaved-value="0">
<generator class="native" />
</id>
<property name="CompanyName" column="CompanyName" />
<property name="Phone" column="Phone" />
</class>
</hibernate-mapping>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="PropertyFormulaExample.Order, PropertyFormulaExample" table="Orders" lazy="false">
<id name="OrderID" column="OrderID" unsaved-value="0">
<generator class="native" />
</id>
<property name="CustomerID" column="CustomerID" />
<property name="ShipVia" type="PropertyFormulaExample.Shipper, PropertyFormulaExample" formula="dbo.GetShipper(shipvia)" />
</class>
</hibernate-mapping>
实体:
public class Order
{
public int OrderID { get; set; }
public string CustomerID { get; set; }
public Shipper ShipVia { get; set; }
}
public class Shipper : ILifecycle
{
public int ShipperID { get; set; }
public string CompanyName { get; set; }
public string Phone { get; set; }
#region ILifecycle Members
public LifecycleVeto OnDelete(NHibernate.ISession s)
{
throw new NotImplementedException();
}
public void OnLoad(NHibernate.ISession s, object id)
{
}
public LifecycleVeto OnSave(NHibernate.ISession s)
{
throw new NotImplementedException();
}
public LifecycleVeto OnUpdate(NHibernate.ISession s)
{
throw new NotImplementedException();
}
#endregion
}
最后是 SQL 函数:
CREATE FUNCTION dbo.GetShipper(@shipperId int)
RETURNS int
AS
BEGIN
RETURN @shipperId
END
显然,您希望该函数做一些有意义的事情,但想法是您返回实体的 PK 并实现 ILifecycle。