Hibernate 一对一外键双向关联-优快云博客

本文探讨了对象模型设计及其实现方式，包括类Person及其属性、映射关系与持久化过程，通过XML映射文件展示如何将Java类映射到数据库表，以及配置文件中的数据库连接设置和持久化策略。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

对象模型

public class Person implements java.io.Serializable {

  private Long id;
  private String name;
  private Address address;

public class Address implements java.io.Serializable {
  private Long id;
  private Person person;
  private String detail;

映射文件

<? xml version ="1.0" encoding ="utf-8" ?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

< hibernate-mapping >
  < class name ="entity.Person" table ="person" >
    < id name ="id" type ="java.lang.Long" >
      < column name ="id" />
      < generator class ="identity" />
    </ id >
    < property name ="name" type ="java.lang.String" >
      < column name ="name" length ="24" not-null ="true" >
        < comment > 姓名</ comment >
      </ column >
    </ property >
    < one-to-one name ="address" cascade ="all" />
  </ class >
</ hibernate-mapping >

<? xml version ="1.0" encoding ="utf-8" ?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

< hibernate-mapping >
  < class name ="entity.Address" table ="address" catalog ="testdb" >
    < id name ="id" type ="java.lang.Long" >
      < column name ="id" />
      < generator class ="identity" />
    </ id >
    < property name ="detail" type ="java.lang.String" >
      < column name ="detail" length ="120" not-null ="true" >
        < comment > 详细地址</ comment >
      </ column >
    </ property >
    < many-to-one name ="person" class ="entity.Person"
      fetch ="select" unique ="true" >
      < column name ="personid" >
        < comment > 人的ID</ comment >
      </ column >
    </ many-to-one >
  </ class >
</ hibernate-mapping >

hubernate-configuration配置文件

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql:///brank-utf8</property>
        <property name="connection.username">root</property>
        <property name="connection.password">123456</property>

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hbm2ddl.auto">create</property>
        <property name="connection.password">123456</property>
        <property name="show_sql">true</property>
        <mapping resource="com/cardvalue/dao/entrty/User.hbm.xml" />
        <mapping resource="com/cardvalue/dao/entrty/Sales_store.hbm.xml" />
        <mapping resource="com/cardvalue/dao/entrty/Card.hbm.xml" />
        <mapping resource="com/cardvalue/dao/entrty/IdCard.hbm.xml" />


    </session-factory>

</hibernate-configuration>

测试

import org.hibernate.Transaction;

import entity.Address;
import entity.Person;

import utils.HibernateSessionFactory;

public class Test {
  public static void main(String[] args) {
    savePerson();
  }

  public static void savePerson() {
    Person person = new Person("张三" );
    Address address = new Address("XX街X号" );
    person.setAddress(address);
    address.setPerson(person);

    Session session = HibernateSessionFactory.getSession();
    Transaction tx = session.beginTransaction();
    session.save(person);
    tx.commit();
  }
}