如何在Spring & Hibernate中使用一个实体/类连接三个表

// 实体类
@Entity
@Table(name = "table1")
public class EntityClass {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    // 其他属性

    @OneToOne
    @JoinColumn(name = "table2_id")
    private Table2Entity table2;

    @OneToOne
    @JoinColumn(name = "table3_id")
    private Table3Entity table3;

    // 构造方法、getter和setter方法
}

// DAO接口
public interface EntityClassDAO {
    void save(EntityClass entity);

    void update(EntityClass entity);

    void delete(EntityClass entity);

    EntityClass getById(Long id);

    // 其他查询方法
}

// DAO实现类
@Repository
public class EntityClassDAOImpl implements EntityClassDAO {
    @Autowired
    private SessionFactory sessionFactory;

    @Override
    public void save(EntityClass entity) {
        sessionFactory.getCurrentSession().save(entity);
    }

    // 其他方法的实现

    @Override
    public EntityClass getById(Long id) {
        return sessionFactory.getCurrentSession().get(EntityClass.class, id);
    }
}

// Spring配置文件中的Hibernate配置
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan" value="com.example.entity" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
        </props>
    </property>
</bean>

// 业务逻辑代码
@Service
public class EntityClassService {
    @Autowired
    private EntityClassDAO entityClassDAO;

    public void saveEntity(EntityClass entity) {
        // 处理业务逻辑
        entityClassDAO.save(entity);
    }

    // 其他方法的实现
}