java - @Where 子句在 hibernate 连接查询中不起作用

Question

我有 2 个带有 @Where 注释的实体。第一个是类别；

@Where(clause = "DELETED = '0'")
public class Category extends AbstractEntity

有如下关系；

@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "category")
private Set<SubCategory> subCategories = Sets.newHashSet();

第二个实体是 SubCategory；

@Where(clause = "DELETED = '0'")
public class SubCategory  extends AbstractEntity

并且包含对应关系；

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "CATEGORY_ID")
private Category category;

每当我调用以下 Dao 方法时；

@Query(value = "select distinct category from Category category join fetch category.subCategories subcategories")
public List<Category> findAllCategories();

我得到了以下 sql 查询；

    select
        distinct category0_.id as id1_3_0_,
        subcategor1_.id as id1_16_1_,
        category0_.create_time as create2_3_0_,
        category0_.create_user as create3_3_0_,
        category0_.create_userip as create4_3_0_,
        category0_.deleted as deleted5_3_0_,
        category0_.update_time as update6_3_0_,
        category0_.update_user as update7_3_0_,
        category0_.update_userip as update8_3_0_,
        category0_.version as version9_3_0_,
        category0_.name as name10_3_0_,
        subcategor1_.create_time as create2_16_1_,
        subcategor1_.create_user as create3_16_1_,
        subcategor1_.create_userip as create4_16_1_,
        subcategor1_.deleted as deleted5_16_1_,
        subcategor1_.update_time as update6_16_1_,
        subcategor1_.update_user as update7_16_1_,
        subcategor1_.update_userip as update8_16_1_,
        subcategor1_.version as version9_16_1_,
        subcategor1_.category_id as categor11_16_1_,
        subcategor1_.name as name10_16_1_,
        subcategor1_.category_id as categor11_3_0__,
        subcategor1_.id as id1_16_0__ 
    from
        PUBLIC.t_category category0_ 
    inner join
        PUBLIC.t_sub_category subcategor1_ 
            on category0_.id=subcategor1_.category_id 
    where
        (
            category0_.DELETED = '0' 
        )

你能告诉我为什么上面的查询缺少

and subcategor1_.DELETED = '0'

在它的 where block 中？

Answer 1

我刚刚在我的项目中解决了类似的问题。

@Where 注释不仅可以放在实体上，也可以放在您的子集合上。

根据javadoc :

Where clause to add to the element Entity or target entity of a collection

在你的情况下，它会像:

@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "category")
@Where(clause = "DELETED = '0'")
private Set<SubCategory> subCategories = Sets.newHashSet();

请查找已解决的类似问题here

我相信与使用 Hibernate 过滤器相比，解决方案没有侵入性。这些过滤器在默认情况下被禁用并在 session 级别运行，因此每次打开新 session 时启用它们是额外的工作，尤其是当您的 DAO 通过像 Spring Data 这样的抽象工作时