java - ORA-02292 : integrity constraint violated - child record found - fetchType issue?

Question

从具有多个子实体的表中删除时遇到一个小问题。

我有一张名为 UNIVERSITY 的表和一张名为 STUDENT 的表。

@OneToMany(mappedBy = "university", fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true)
private List<Student> studentList = new ArrayList<>();

@ManyToOne(fetch = FetchType.EAGER)
private University university;

我希望从大学表中删除一行:

@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public void deleteFromUniveristy(Long id) {
    em.createNamedQuery(University.DELETE_BY_ID)
            .setParameter("id", id)
            .executeUpdate();
}

@NamedQuery(name = University.DELETE_BY_ID, query = "delete from University uu where uu.id =:id")

但是收到错误消息:

java.sql.SQLIntegrityConstraintViolationException: ORA-02292: integrity constraint violated - child record found

我不明白，orphanRemoval = true 并且给定的 CascadeType 不能保证可以进行此删除？

谢谢!

Answer 1

可以使用 entityManager.remove(entity) 方法删除父级和子级。级联在删除 JPQL 中不起作用。