Java JPA Criteria API-查询代码在单独执行时有效，但在用作子查询时无效

我有一个名为

Issue

的实体和一个名为

UserIssue

的实体<代码>用户问题扩展

问题

@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@Where(clause = "DELETED_AT IS NULL")
@Entity(name = "ISSUE")
public class Issue extends VersionedSequenceIdEntity {
... all fields
}

@Where(clause = "DELETED_AT IS NULL")
@Entity(name = "USER_ISSUE")
public class UserIssue extends Issue {

    ...

    @Column(name = "IS_PRIVATE", nullable = false)
    private Boolean isPrivate;

    ...
}

我正在做一个子查询，以按sublcass属性进行过滤。我的确切测试用例是我创建了三个用户问题。其中两个在false上具有“isPrivate”属性。第三个是真的

当我执行这个实际上只是子查询的代码时，结果包含两个基于条件的“问题”，它是正确的

CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<UserIssue> issueQuerySimple = cb.createQuery(UserIssue.class);
Root<UserIssue> issueRootSimple = issueQuerySimple.from(UserIssue.class);

issueQuerySimple.select(issueRootSimple).where(cb.isFalse(issueRootSimple.get("isPrivate")));
List<UserIssue> resultListSimple = entityManager.createQuery(issueQuerySimple).getResultList();

那么，为什么基于子类字段的过滤不起作用，它会返回所有三个实例，而不是两个？有什么不对劲还是我看不见

---

非常感谢

替换

issueQuery.select（issueRoot）.where（cb.exists（subQuery））

与

issueQuery.select（issueRoot）.where（issueRoot.get（“id”）.in（子查询））

解释


从sql查询中我们可以看到，只要存在一个one
userissue
with
is_private=0
，它就会选择所有
问题

这不是你想要的行为。您仍然必须使用子查询，但要在
中用
issue0.id替换
exists
，而此代码段就是这样做的
您能否将
问题
表格中的数据添加到问题中？
CriteriaQuery<Issue> issueQuery = cb.createQuery(Issue.class);
Root<Issue> issueRoot = issueQuery.from(Issue.class);

Subquery<UserIssue> subQuery = issueQuery.subquery(UserIssue.class);
Root<UserIssue> userIssueRoot = subQuery.from(UserIssue.class);

subQuery.select(userIssueRoot).where(cb.isFalse(userIssueRoot.get("isPrivate")));

issueQuery.select(issueRoot).where(cb.exists(subQuery));
List<Issue> resultList = entityManager.createQuery(issueQuery).getResultList();

select
        issue0_.id as id2_2_,
        issue0_.deleted_at as deleted_3_2_,
        issue0_.created_when as created_4_2_,
        issue0_.created_by as created_5_2_,
        issue0_.updated_when as updated_6_2_,
        issue0_.version as version7_2_,
        issue0_.application_id as applicat8_2_,
        issue0_.version_id as version_9_2_,
        issue0_.organization_id as organiz10_2_,
        issue0_.severity as severit11_2_,
        issue0_.state as state12_2_,
        issue0_.title as title13_2_,
        issue0_.type_id as type_id18_2_,
        issue0_.updated_by_customer_at as updated14_2_,
        issue0_.assigned_to as assigne15_2_,
        issue0_.description as descrip16_2_,
        issue0_.is_private as is_priv17_2_,
        issue0_.dtype as dtype1_2_ 
    from
        issue issue0_ 
    where
        (
            issue0_.DELETED_AT IS NULL
        ) 
        and (
            exists (
                select
                    userissue1_.id 
                from
                    issue userissue1_ 
                where
                    userissue1_.dtype='UserIssue' 
                    and (
                        userissue1_.DELETED_AT IS NULL
                    ) 
                    and userissue1_.is_private=0
            )
        )