java - Hibernate 二级缓存一对一不起作用

Question

我将 Ehcache 提供程序用于 Hibernate 二级缓存。它缓存一对多集合，用@Cache注解，但不缓存一对一:

//hb annotations
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = "user")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true, mappedBy = "user")
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = "details")
    private Details details;

    //getters, setters, constructors etc.

}

//hb annotations
public class Details {

    @GenericGenerator(name = "generator", strategy = "foreign",
    parameters = @Parameter(name = "property", value = "user"))
    @Id
    @GeneratedValue(generator = "generator")
    @Column(unique = true, nullable = false)
    private Integer id;

    @OneToOne
    @PrimaryKeyJoinColumn
    private User user;

    //getters, setters, constructors ets.

}

我使用 Spring JpaRepository 来获取数据:

userRepository.findOne(id);

Answer 1

对于 ToOne 关联 only the id (foreign key)关联实体实例的缓存在拥有实例的条目中:

Hibernate stores cached entities in a dehydrated form, which is similar to the database representation. Aside from the foreign key column values of the @ManyToOne or @OneToOne child-side associations, entity relationships are not stored in the cache.

因此，当拥有实例从 L2 缓存中组装时，关联实体必须通过其 id 加载。为避免这种情况，请使关联实体(在您的情况下为 Details)也可缓存。

还有更多详细信息 here和 here .