Hibernate一对一外键双向关联(Annotation配置篇)

Husband.java

package com.one2one.bean;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name="husband",catalog="Hibernate_One2One_fk")
public class Husband {
    
    private int id;
    private String name;
    private Wife wife;
    @Id
    @Column(name="id")
    @GeneratedValue(strategy=GenerationType.AUTO)
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @OneToOne(cascade=CascadeType.ALL,mappedBy="husband")
    public Wife getWife() {
        return wife;
    }
    public void setWife(Wife wife) {
        this.wife = wife;
    }
    
}

Wife.java

package com.one2one.bean;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name="wife",catalog="Hibernate_One2One_fk")
public class Wife {
    
    private int id;
    private String name;
    private Husband husband;
    @Id
    @Column(name="id")
    @GeneratedValue(strategy=GenerationType.AUTO)
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @OneToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="husband_id")
    public Husband getHusband() {
        return husband;
    }
    public void setHusband(Husband husband) {
        this.husband = husband;
    }
    
}

导出的sql

create table Hibernate_One2One_fk.husband (
        id integer not null auto_increment,
        name varchar(255),
        primary key (id)
    )

    create table Hibernate_One2One_fk.wife (
        id integer not null auto_increment,
        name varchar(255),
        husband_id integer,
        primary key (id)
    )

    alter table Hibernate_One2One_fk.wife 
        add index FK37AF119039AEDD (husband_id), 
        add constraint FK37AF119039AEDD 
        foreign key (husband_id) 
        references Hibernate_One2One_fk.husband (id)

测试代码

@Test
    public void save(){
        Session session=HibernateSessionFactory.getSession();
        Transaction transaction=session.beginTransaction();
        try {
            transaction.begin();
            Husband husband=new Husband();
            husband.setName("张三");
            session.save(husband);
            Wife wife=new Wife();
            wife.setName("如花");
            wife.setHusband(husband);
            session.save(wife);
            transaction.commit();
        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }
    
    @Test
    public void select(){
        Session session=HibernateSessionFactory.getSession();
        Husband husband=(Husband) session.get(Husband.class, 1);
        System.out.println(husband.getName());
        System.out.println(husband.getWife().getName());
    }