Hibernate:在多对多关系中添加实体会导致对其他实体进行不必要的更新

Question

使用Hibernate，给定实体之间的多对多关系，并使用@Version的乐观锁定

@Entity
class Payment {
    @Id
    @GeneratedValue
    public Long paymentId;
    @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private List<Refund> refunds = new ArrayList<Refund>();
    @Version
    private long version;
}
@Entity
public class DRefund {
    @Id
    @GeneratedValue
    private Long refundId;
    @ManyToMany(mappedBy = "refunds")
    private List<Payment> payments = new ArrayList<Payment>();
    @Version
    private long version;
}

如果我使用Hibernate会话从数据库加载Payment，添加Refund到它，然后使用Hibernate会话保存Refund，数据库中的Payment行也得到更新:

insert into Refund (version, refundId) values (?, ?, ?)
update Payment set version=? where paymentId=? and version=?
insert into Payment_Refund (payments_paymentId, refunds_refundId) values (?, ?)

Payment没有以任何方式改变。这是必要的吗?或者是否可以调整hibernate映射以避免这种行为?如果我删除@Version, Payment不会更新。

谢谢你的帮助!

Answer 1

此行为可以使用@OptimisticLock注释配置:

@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@OptimisticLock(excluded = true)
private List<Refund> refunds = new ArrayList<Refund>();