Hibernate删除的对象将通过级联重新保存

Question

我正在尝试删除hibernate中的子实体,但遇到以下异常：

 org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations): [com.epic.ecommerce.core.model.Customer#newnameTest]
at org.hibernate.internal.SessionImpl.forceFlush(SessionImpl.java:1236)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:114)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:684)
at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:676)
at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:235)
at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:350)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:293)...

这些是我的实体：

@Entity

@table(name=“Customer”）公共类Customer{

    @Id
    @Column(name="customer_id")
    @GeneratedValue(generator="gen")
    @GenericGenerator(name="gen", strategy="foreign",parameters=@Parameter(name="property", value="user"))
    private String id;

@OneTomany(Cascade=CascadeType.All,MappedBy=“CustomerID”,OphanRemoval=True)私有集QuoteConfig；

    public Set<QuoteConfiguration> getQuoteConfigs() {
    return quoteConfigs;
    }

    public void setQuoteConfigs(Set<QuoteConfiguration> quoteConfigs) {
    this.quoteConfigs = quoteConfigs;
    }


    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    @OneToOne
    @PrimaryKeyJoinColumn
    private User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }



@Entity
@Table(name="quote_configuration")
public class QuoteConfiguration implements java.io.Serializable{

@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "quote_id",unique = true, nullable = false)  
private Integer quoteId;

@Column(name = "base_product", nullable = false)
private String baseProduct;

@Column(name = "quote_name")
private String quoteName;   

/*
@Column(name = "customer_customer_id")
private String customerId;

public String getCustomerId() {
    return customerId;
}

public void setCustomerId(String customerId) {
    this.customerId = customerId;
}
*/
@ManyToOne(cascade=CascadeType.ALL) 
@JoinColumn(name = "customer_customer_id")
private Customer customerId;


public Customer getCustomerId() {
    return customerId;
}

public void setCustomerId(Customer customerId) {
    this.customerId = customerId;
}

这是我想要移除的部分

    Session session = this.sessionFactory.getCurrentSession();
    Query q = session.createQuery("from QuoteConfiguration where quoteId = :quoteId ");
    q.setParameter("quoteId", quoteId);
    QuoteConfiguration quote = (QuoteConfiguration)q.list().get(0);

    Query qc=session.createQuery("from Customer where id=:id");
    qc.setParameter("id", quote.getCustomerId().getId());

    Customer customer=(Customer)qc.list().get(0);
    customer.getQuoteConfigs().remove(quote);
    session.delete(quote);
    session.save(customer);

我的问题是如何删除子实体QuoteConfiguration，而不在Customer中获得关联异常。谢谢

Answer 1

只需从代码中删除会话.delete(quote)。

您的@OneTomany集合是记录的主机，并且已经将其设置为删除孤立元素。因此，当您执行customer.getQuoteConfigs().remove(quote)时，它已经告诉Hibernate从数据库中删除记录。

需要注意的是，您应该尝试session.get(class，id)而不是使用HQL来获取单个实例。

您不需要save(customer)，因为Hibernate始终跟踪持久化实例。它们将在事务关闭时自动保存（除非您的会话设置为手动，这不应该）。