java - org.hibernate.TransientObjectException : how to properly define one-to-one relationship?

Question

保存复合对象时，我不断收到此异常。仍然不知道如何克服它。这是我的映射:

@Entity
@Table(name = "store_house")
public class StoreHouse implements Serializable {

    // constructors

    @Id
    @OneToOne(fetch = FetchType.EAGER)
    @Cascade({org.hibernate.annotations.CascadeType.ALL})
    @JoinColumn(name="ING_ID", unique=true, nullable=false, updatable=false)
    private Ingredient ingredient;

    @Column(name = "QUANTITY")
    private double quantity;
}

// getters and setters

这是 DAO 方法，我在其中遇到此异常:

    @Override
    public void insert(StoreHouse sh) {
         sessionFactory.getCurrentSession().persist(sh);
    }

这是我的测试类(class):

@Transactional
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"/test-context.xml", "/test-data.xml"})
public class StoreHouseDAOTest {

    @Autowired
    private SessionFactory sessionFactory;

    @Autowired
    private StoreHouseDAO storeHouseDAO;

    @Autowired
    private StoreHouse expectedStoreHouse;

    @Test
    public void itShouldPerformCRUDSmoothly() {
            // CREATE
            storeHouseDAO.insert(expectedStoreHouse);
            sessionFactory.getCurrentSession().flush();
            // READ
            StoreHouse actualStoreHouse = storeHouseDAO.getByIngredient(expectedStoreHouse.getIngredient());
            assertEquals(actualStoreHouse.getIngredient().getId(), expectedStoreHouse.getIngredient().getId());
            // DELETE
            storeHouseDAO.delete(expectedStoreHouse);
            sessionFactory.getCurrentSession().flush();
            StoreHouse emptyStoreHouse = storeHouseDAO.getByIngredient(expectedStoreHouse.getIngredient());
            assertNull(emptyStoreHouse);
    }
}

定义的测试数据片段:

   <bean id="expectedIngredient" class="com.restaurant.model.Ingredient">
        <property name="name" value="TestIngredient"/>
        <property name="unit" value="expectedUnit"/>
    </bean>

    <bean id="expectedStoreHouse" class="com.restaurant.model.StoreHouse">
        <property name="ingredient" ref="expectedIngredient"/>
        <property name="quantity" value="10"/>
    </bean>

我觉得我在这里定义级联时搞砸了..但是你能帮我改正它吗？

Answer 1

我设法让它发挥作用，但代价是简化模型。

@Entity
@Table(name = "store_house")
public class StoreHouse implements Serializable {

    // constructors

    @Id
    @GeneratedValue(generator = "increment")
    @GenericGenerator(name = "increment", strategy = "increment")
    @Column(name = "SH_ID")
    private Long id;

    @OneToOne(fetch = FetchType.EAGER)
    @Cascade({org.hibernate.annotations.CascadeType.ALL})
    @JoinColumn(name="ING_ID", unique=true, nullable=false, updatable=false)
    private Ingredient ingredient;

    @Column(name = "QUANTITY")
    private double quantity;

    // getters and setters
    }

它实际上需要一个单独的 id 字段，所以我创建了它。并表示工作顺利。可能会选择它，因为没有找到其他解决方案。