Hibernate双向一对一映射关系配置代码实例

1、外键映射

1.1、实体类

package com.yl.bean;

import java.io.Serializable;


public class Person implements Serializable {
  private Integer id;
  private String name;
  private PersonCard card;

  public Person() {
  }

  public Person(Integer id, String name, PersonCard card) {
    this.id = id;
    this.name = name;
    this.card = card;
  }

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public PersonCard getCard() {
    return card;
  }

  public void setCard(PersonCard card) {
    this.card = card;
  }

  @Override
  public String toString() {
    return "Person{" +
 "id=" + id +
 ", name='" + name + ''' +
 ", card=" + card +
 '}';
  }
}

package com.yl.bean;

import java.io.Serializable;


public class PersonCard implements Serializable {
  private Integer id;
  private String cardNo;
  private Person person;

  public PersonCard() {
  }

  public PersonCard(Integer id, String cardNo, Person person) {
    this.id = id;
    this.cardNo = cardNo;
    this.person = person;
  }

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getCardNo() {
    return cardNo;
  }

  public void setCardNo(String cardNo) {
    this.cardNo = cardNo;
  }

  public Person getPerson() {
    return person;
  }

  public void setPerson(Person person) {
    this.person = person;
  }

  @Override
  public String toString() {
    return "PersonCard{" +
 "id=" + id +
 ", cardNo='" + cardNo + ''' +
 ", person=" + person +
 '}';
  }
}

1.2、全局配置文件(hibernate.cfg.xml)

  
    
    com.mysql.cj.jdbc.Driver
    jdbc:mysql://localhost:3306/hibernate?characterEncoding=utf8&serverTimezone=GMT%2B8
    root
    123456
    
    true
    
    update
    
    
    

1.3、公民映射配置文件(Person.hbm.xml)

1.4、身份证映射配置文件（PersonCard.hbm.xml）

1.5、测试类

 @Test
  public void test01(){
    Person person=new Person();
    person.setName("yl001");

    PersonCard personCard=new PersonCard();
    personCard.setCardNo("001");

    person.setCard(personCard);
    personCard.setPerson(person);

    Session session= HibernateUtils.getSession();
    Transaction transaction=session.beginTransaction();
    session.save(person);
    session.save(personCard);
    transaction.commit();

    session.close();
  }

2、主键映射

表的字段既是主键，又是外键(eg:身份证号码既是主键又是外键)

2.1、映射配置文件实现

主要修改PersonCard.hbm.xml文件

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