Question

我有2个@Where注释实体。第一个是Category;

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

它有以下关系;

@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

并包含相应的关系;

@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乏

和subcategor1_.DELETED ='0'

在哪里阻止？

Answer 1

我刚刚解决了项目中的类似问题。

可以将@Where注释不仅放在Entity上，还可以放在子集上。

根据javadoc：

要添加到元素的Where子句实体或目标集合的实体

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

我认为因此，与使用Hibernate过滤器相比，解决方案不具有侵入性。默认情况下，这些过滤器处于禁用状态并在会话级别运行，因此每次新的Session打开时启用它们都是额外的工作，尤其是当您的DAO通过Spring Data等抽象工作时

Answer 2

这是一个快速回复;

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

直接查询SubCategry时，

Where会生效。要不删除子类别，请使用Hibernate Filters 例如here

@Where子句在hibernate join query

2 个答案: