@ManyToOne上的Hibernate @Filter

时间:2014-11-28 00:48:54

标签: hibernate jpa filter many-to-one

有些人可以解释一下为什么在@ManyToOne关系上使用@Filter不起作用? 在这里,我有一个非常简单的例子显示:

我在我的数据库中创建了两个简单的表(foo和bar)

Foo: id/id_bar
bar: id/name/state (state can be active or inactive)

和我的实体:

@Entity
@FilterDef(name = "foo_active")
@Table(name = "foo")
public class Foo extends AbstractTimestampEntity implements Serializable {


    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "id")
    private Integer id;

    @ManyToOne(cascade = CascadeType.DETACH, fetch = FetchType.LAZY)
    @JoinColumn(name = "bar")
    @Filter(name = "foo_active", condition = "state='active'")
    private Bar bar;
}

@Entity
@Table(name = "foo")
public class Bar extends AbstractTimestampEntity implements Serializable {


    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "id")
    private Integer id;

    @Column(name = "name")
    private String name;

    @Column(name = "state")
    private String state;
}

现在我运行此查询

@Query("SELECT f FROM Foo f")
public List<Foo> getTest();

它返回Foo的全部内容(活动的以及非活动的.....)看起来过滤器未被激活,即使在查询之前运行也很困难

Session session = entityManager.unwrap(Session.class);
session.enableFilter("foo_active")

在日志中我可以看到:

0:47:33.878 [Test worker] DEBUG o.h.h.i.ast.QueryTranslatorImpl - HQL: SELECT f FROM pl.jcommerce.ocean.services.model.Foo f
00:47:33.878 [Test worker] DEBUG o.h.h.i.ast.QueryTranslatorImpl - S**QL: select foo0_.id as id1_5_, foo0_.created as created2_5_, foo0_.updated as updated3_5_, foo0_.bar as bar6_5_ from foo foo0_**

如您所见,有“WHERE bar.state ='active'”子句....

有人可以帮我这个吗?

谢谢!

2 个答案:

答案 0 :(得分:0)

您可以尝试以下操作:代替@Filter字段中的@ManyToOne,在class Foo上添加此过滤器:

@Filter(name = "foo_active", condition = "bar in (select id from Bar where state = 'active')")

请注意,这可能会导致查询效率低下。

答案 1 :(得分:0)

最近与@Filter一起使用时,@ManyToOne遇到了同样的问题。诀窍是在目标实体上使用@Filter而不在关联上。

@Entity
@Table(name = "foo")
@Filter(name = "foo_active", condition = "state='active'")
public class Bar

并且Foo类中的关联应该是:

@ManyToOne(cascade = CascadeType.DETACH, fetch = FetchType.LAZY)
@JoinColumn(name = "bar")
private Bar bar;

希望这有帮助!