hibernate 关系映射之 双向外键关联一对一

在上一篇博客内容的基础上做了以下修改，即可实现。

 

注解方式：

 

package com.bjsxt.hibernate;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity
public class Wife {
    private int id;
    private String name;
    private Husband husband;
    @OneToOne(mappedBy="wife")//加上后边括号内容可以防止生成多余的键字段，表示husband中的哪个字段已经做了映射，只要和其关联即可。
    public Husband getHusband() {
        return husband;
    }
    public void setHusband(Husband husband) {
        this.husband = husband;
    }
    @Id
    @GeneratedValue
    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方式:

在Student类中也要添加private StuIdCard stuIdCard属性，然后在上一篇博客的基础上修改以下内容

Student.hbm.xml

 

<?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>
    <class name="com.bjsxt.hibernate.Student" dynamic-update="true">
        <id name="id">
            <generator class="native"></generator>
        </id>
       
        <property name="name"></property>
        <property name="age" />
        <property name="sex" />
        <property name="good" type="yes_no"></property>
        <one-to-one name="stuIdCard" property-ref="student"></one-to-one>
    </class>
   
</hibernate-mapping>