NHibernate使用入门(十)

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多对一双向映射

Address.hbm.xml映射文件

<?xml version="1.0" encoding="utf-8" ?><hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-lazy="false"                   assembly="NtestRelationship"                   namespace="NtestRelationship.Entities"                   >  <class name="Address">    <id type="int" name="Id">      <column name="AddressId" />      <generator class="identity"></generator>    </id>    <property name="Country"/>    <property name="Street"/>    <property name="StreetNumber"/>    <property name="PostalCode"/>    <property name="City"/>    <one-to-one name="Customer" />  </class></hibernate-mapping>

Customer.hbm.xml映射文件

<?xml version="1.0" encoding="utf-8" ?><hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-lazy="false"                   assembly="NtestRelationship"                   namespace="NtestRelationship.Entities"                   >  <class name="Customer">    <id type="int" name="Id">      <column name="Id" />      <generator class="identity"></generator>    </id>    <property name="FirstName"/>    <property name="LastName"/>    <many-to-one name="Address" not-null="false" column="addressId" unique="true" ></many-to-one>  </class></hibernate-mapping>

ManyToOneRelationBidirectional 类

  public class ManyToOneRelationBidirectional     {        private readonly ISessionFactory sessionFactory = new Configuration().Configure().BuildSessionFactory();        protected object CustomerId=1;        protected object AddressId=1;        public void Customer_Address_OneWayRelation()        {            using (var session = sessionFactory.OpenSession())            using (var transaction = session.BeginTransaction())            {                Customer customer = session.Get<Customer>(CustomerId);                Address address = session.Get<Address>(AddressId);                customer.Address = address;                session.Save(customer);                transaction.Commit();            }            using (var session = sessionFactory.OpenSession())            {                Customer customerSecond = session.Get<Customer>(CustomerId);                Console.WriteLine("customerSecond.Address NotBeNull IS:" + (customerSecond.Address != null));             }        }        public void Customer_Address_TwoWayRelation()        {            using (var session = sessionFactory.OpenSession())            using (var transaction = session.BeginTransaction())            {                Customer customer = session.Get<Customer>(CustomerId);                Address address = session.Get<Address>(AddressId);                customer.Address = address;                session.Save(customer);                transaction.Commit();            }            using (var session = sessionFactory.OpenSession())            {                Customer customerSecond = session.Get<Customer>(CustomerId);                Address addressSecond = session.Get<Address>(AddressId);                Console.WriteLine("addressSecond.Customer NotBeNull IS:" + (addressSecond.Customer != null));                Console.WriteLine("customerSecond.Address NotBeNull IS:" + (customerSecond.Address != null));             }        }        public void Customer_Address_TwoWayRelationAssignCustomerToAddress()        {            using (var session = sessionFactory.OpenSession())            using (var transaction = session.BeginTransaction())            {                Customer customer = session.Get<Customer>(CustomerId);                Address address = session.Get<Address>(AddressId);                customer.Address = address;                address.Customer = customer;                session.Save(customer);                transaction.Commit();            }            using (var session = sessionFactory.OpenSession())            {                Customer customerSecond = session.Get<Customer>(CustomerId);                Address addressSecond = session.Get<Address>(AddressId);                Console.WriteLine("addressSecond.Customer NotBeNull IS:" + (addressSecond.Customer != null));                Console.WriteLine("customerSecond.Address NotBeNull IS:" + (customerSecond.Address != null));             }        }    }

主程序

 class Program    {        static void Main(string[] args)        {           ManyToOneRelationBidirectional mtmr=new ManyToOneRelationBidirectional();            mtmr.Customer_Address_OneWayRelation();            mtmr.Customer_Address_TwoWayRelation();            mtmr.Customer_Address_TwoWayRelationAssignCustomerToAddress();            Console.ReadKey();        }    }

运行结果如图:

这里写图片描述

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