hibernate中的一对一（双向）

IdCard

package com.wxh.dto;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity
public class IdCard {
  private int num;
  private String name;
  
  private People people;  
  
  public IdCard() {
  }
  public IdCard(int num, String name) {
    this.num = num;
    this.name = name;
  }
  @Id
  @Column(name="cardNum")
  public int getNum() {
    return num;
  }
  public void setNum(int num) {
    this.num = num;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  
  //配置一对一的关系，主动放弃维护关系（由另一方维护）
  @OneToOne(fetch=FetchType.EAGER,mappedBy="idcard")
  public People getPeople() {
    return people;
  }
  public void setPeople(People people) {
    this.people = people;
  }   
  
}

People

package com.wxh.dto;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.SequenceGenerator;

@Entity
public class People { 
  
  private Integer pid;    
  private String sex;
  private String phone;
  private String address; 
  
  private IdCard idcard;    

  public People() {
  }

  public People(Integer pid, String sex, String phone, String address,
      IdCard idcard) {
    super();
    this.pid = pid;
    this.sex = sex;
    this.phone = phone;
    this.address = address;
    this.idcard = idcard;
  }

  @Id
  public Integer getPid() {
    return pid;
  }

  public void setPid(Integer pid) {
    this.pid = pid;
  }

  public String getSex() {
    return sex;
  }

  public void setSex(String sex) {
    this.sex = sex;
  }

  public String getPhone() {
    return phone;
  }

  public void setPhone(String phone) {
    this.phone = phone;
  }

  public String getAddress() {
    return address;
  }

  public void setAddress(String address) {
    this.address = address;
  }
  
  //配置一对一的唯一外键关联
  @OneToOne(fetch=FetchType.EAGER,cascade={CascadeType.ALL})
  @JoinColumn(name="num",referencedColumnName="cardNum",unique=true)
  public IdCard getIdcard() {
    return idcard;
  }

  public void setIdcard(IdCard idcard) {
    this.idcard = idcard;
  } 
}

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
  "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
  "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
  <session-factory>
    <property name="hbm2ddl.auto">update</property>
  <property name="dialect">
    org.hibernate.dialect.Oracle9Dialect
  </property>
  <property name="connection.url">
    jdbc:oracle:thin:@127.0.0.1:1521:orcl
  </property>
  <property name="connection.username">scott</property>
  <property name="connection.password">tiger</property>
  <property name="connection.driver_class">
    oracle.jdbc.driver.OracleDriver
  </property>
  <property name="myeclipse.connection.profile">oracle</property>
  <property name="show_sql">true</property>
  <property name="format_sql">true</property>
  
  <!-- 开启缓存 -->
  <property name="cache.use_second_level_cache">true</property>
  <property name="hibernate.cache.region.factory_class">org.hibernate.cache.EhCacheRegionFactory</property>
  
  
  <!-- 本地事务 -->
<!--   <property name="current_session_context_class">thread</property>     -->
  <mapping class="com.wxh.dto.People"/>   
  <mapping class="com.wxh.dto.IdCard"/>
  <class-cache usage="read-only" class="com.wxh.dto.People"/>
    
  </session-factory>
</hibernate-configuration>

Test

package test;

import org.hibernate.Session;
import org.hibernate.cfg.Configuration;

import com.wxh.dto.IdCard;
import com.wxh.dto.People;
import com.wxh.sessionfactory.HibernateSessionFactory;

public class Test {

  public static void main(String[] args) {
    Session session=HibernateSessionFactory.getSession(); 
      
    IdCard card=new IdCard(1001,"张三");
    
    People people=new People(1,"男","10086","湖北武汉",card);
    
    //session.save(card);
//    session.save(people);   
//    session.beginTransaction();   
//    session.getTransaction().commit();
    
    IdCard c=session.get(IdCard.class, 1001);
    System.out.println(c.getPeople().getPhone());
    
  }

}