Hibernate单向关联1-1

基于外键的单向1-1关联

一个House关联一个Owner。

House类：

package com.ydoing.hibernate3;
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 = "house_inf")
public class House {
    @Id
    @Column(name = "house_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    private String name;

    @OneToOne(targetEntity = Owner.class, cascade = CascadeType.ALL)
    @JoinColumn(name = "owner_id", referencedColumnName = "owner_id", unique = true)
    private Owner owner;

    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 Owner getOwner() {
        return owner;
    }
    public void setOwner(Owner owner) {
        this.owner = owner;
    }
}

Owner类：

package com.ydoing.hibernate3;

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

@Entity
@Table(name = "owner_inf")
public class Owner {

    @Id
    @Column(name = "Owner_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    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;
    }

    private String name;

}

测试类：

package com.ydoing.hibernate3;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.junit.BeforeClass;
import org.junit.Test;

public class Main {
    private static Session session;

    @BeforeClass
    public static void init() {
        Configuration conf = new Configuration();
        conf.configure();
        ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(conf.getProperties())
                .build();
        SessionFactory factory = conf.buildSessionFactory(serviceRegistry);
        session = factory.openSession();
    }

    @Test
    public void test() {
        Transaction tx = session.getTransaction();
        tx.begin();

        Owner owner = new Owner();
        owner.setName("Jack");

        House house = new House();
        house.setName("elegant");

        house.setOwner(owner);

        session.save(house);
        tx.commit();
        session.close();
    }
}

console输出：

Hibernate: 
    insert into owner_inf (name) values (?) Hibernate: insert into house_inf (name, owner_id) values (?, ?) 

从输出可以看出owner_id作为house_inf的外键。

数据表：