package cn.itcase.hibernate.domain;public class Address {private int id;private String street;public int getId() {return id;}
public void setId(int id) {this.id = id;}public String getStreet() {return street;
}
public void setStreet(String street) {this.street = street;
}}package cn.itcase.hibernate.domain;public class Person {private int id;private String name;private Address address;public Address getAddress() {return address;
}
public void setAddress(Address address) {this.address = address;
}
public int getId() {return id;
}
public void setId(int id) {this.id = id;
}
public String getName() {return name;
}
public void setName(String name) {this.name = name;
}
}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.itcase.hibernate.domain"><class name="Address" table="address"><id name="id" ><generator class="native" /></id><property name="street"></property></class>
</hibernate-mapping><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.itcase.hibernate.domain"><class name="Person" table="person"><id name="id" ><generator class="native" /></id><property name="name" /><!--留意这里 name的名称必须和address类中的private Address addr;对象名称一致 列名可任意命名,最好是具有相对意义-->   <many-to-one name="address" column="addressId"/></class>
</hibernate-mapping>

package cn.itcast.hibernate;import java.util.HashSet;
import java.util.Set;import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;import cn.itcase.hibernate.domain.Address;
import cn.itcase.hibernate.domain.Person;public class many2one2 {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubPerson depart=add();Person emp=query(1);//System.out.println(emp.getDepart().getName());//queryDepart(3);//System.out.println(addrquery(1).getPer().getName());}static Address addrquery(int id){Session s=null;Transaction tx=null;try{s=HibernateUtil.getSession();tx=s.beginTransaction();Address addr=(Address)s.get(Address.class, id);//System.out.print(emp.getDepart().getName());Hibernate.initialize(addr.getStreet());tx.commit();return addr;}finally{if(s!=null)s.close();}  }static Person query(int pid){Session s=null;Transaction tx=null;try{s=HibernateUtil.getSession();tx=s.beginTransaction();Person p=(Person)s.get(Person.class, pid);tx.commit();return p;}finally{if(s!=null)s.close();}      }static Person add(){Session s=null;Transaction tx=null;try{Address addr1=new Address();addr1.setStreet("add1");   Person p1=new Person();p1.setName("p1");Person p2=new Person();p2.setName("p2");p1.setAddress(addr1);p2.setAddress(addr1);s=HibernateUtil.getSession();tx=s.beginTransaction();s.save(addr1);s.save(p1);s.save(p2);tx.commit();return p1;}finally{if(s!=null)s.close();}   }}