java - 由于外键约束，删除 JPA 对象失败？

Question

为什么以下查询会由于外键约束而失败？我没有其他方法可以删除我知道的关联数据。

Query query=em.createQuery("DELETE FROM Person");
query.executeUpdate();
em.getTransaction().commit();

我认为导致问题的违规关系是 activationKey 字段:

2029 [main] ERROR org.hibernate.util.JDBCExceptionReporter - integrity
constraint violation: foreign key no action; FKCEC6E942485388AB
table: ACTIVATION_KEY

这是我现在拥有的:

@Entity
@Table(name="person")
public class Person implements Comparable<Person> {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name="id")
    private long id = 0;

    @ElementCollection
    @Column(name = "activation_key")
    @CollectionTable(name = "activation_key")
    private Set<String> activationKey = new HashSet<String>();
}

Answer 1

Why would the following query fail due to a foreign key constraint?

看起来您的批量删除查询没有从集合表中删除条目，因此违反了 FK 约束。

虽然 JPA 规范明确写道批量删除不会级联到相关实体:

4.10 Bulk Update and Delete Operations

...

A delete operation only applies to entities of the specified class and its subclasses. It does not cascade to related entities.

这不完全是你的情况，我认为你想做的事情应该得到支持。

您可能面临 Hibernate 批量删除的限制之一，例如:

• HHH-3337 - Hibernate disregards @JoinTable when generating bulk UPDATE/DELETE for a self-joined entity
• HHH-1917 - Bulk Delete on the owning side of a ManyToMany relation needs to delete corresponding rows from the JoinTable

我建议提出一个问题。

解决方法:使用原生查询删除集合表，然后删除实体表。