JPA：当母公司得到去除，子实体仍然

Question

客户实体（父实体）

@Entity
public class Customer {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

private String name;

@OneToMany(mappedBy="customer", cascade=CascadeType.ALL)
private List<Facility> facilities;

//Setter and Getter for name and facilities

public void addFacility(Facility facility){
    if(this.facilities == null){
        this.facilities = new ArrayList<Facility>();
    }
    this.facilities.add(facility);
    facility.setCustomer(this);
}
}

设施实体（儿童实体）

@Entity
public class Facility {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

@ManyToOne
@JoinColumn(name="CUSTOMER_FK")
private Customer customer;

private String name;

//Setter and Getter, equals and hashcode
...
}

在Customer实体，我用CascadeType.ALL，但是当我删除客户，相关的设施仍然存在。我删除customer通过

Query query = em.createNamedQuery("Customer.delete");
query.setParameter("id", customerId);
query.executeUpdate();

，其中

@NamedQuery(name="Customer.delete", query="delete from Customer c where c.id = :id")

Answer 1

批量删除操作不是级联，每JPA规范：

  

4.10批量更新和删除操作

     

...

     

一个删除操作仅适用于   指定类的实体和   它的子类。它不级联到   相关实体。

     

...

如果您想从级联的利益，加载实体，然后调用它的EntityManager#remove(Object)。

Answer 2

尝试用：

@Inject
EntityManager em;


Customer customer =...;
em.remove(customer);

此总是级联操作。