即使没有任何变化,Spring Auditable实体也会被修改

Question

注意:这是一个复杂的问题,所以我希望我已经涵盖了相关部分.如果没有,我将根据要求编辑和添加更多信息.

我们正在使用Spring(4.1.0)和Hibernate(4.3.6),我们已经定义了一个基类,我们所有的实体都扩展了它们BaseAuditableEntity(下面的代码).当任何实体在一个@Transactional方法被加载,然后修改并保存,该实体的modified_by_user_id和modified_ts都与登录的执行正在取得任何更改的用户的ID进行更新.

我们的问题是,每当一个AppUser(这也延伸BaseAuditableEntity)在其中一个被加载@Transactional方法,它也看到了modified_by_user_id和modified_ts,即使它没有被修改设定.这会产生一个问题,因为我们在不需要的时候几乎每个请求都写入我们的用户表.请注意,这也可能会影响@Transactional未AppUser显式加载的方法,因为AuditorBean加载AppUser自身.

我假设这与AppUser实体是BaseAuditableEntity本身的一部分有关.有人能证实吗？有没有办法解决这个问题？

我们的BaseAuditableEntity类包括AppUser在内的每个实体都扩展了:

@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
public abstract class BaseAuditableEntity implements Auditable<AppUser, Long> {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "hibernate_sequence")
    @SequenceGenerator(name = "hibernate_sequence", sequenceName = "blah_sequence", allocationSize = 1)
    @Column(name = "id")
    private Long id;

    @CreatedBy
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "created_by_user_id")
    private AppUser createdBy;

    @LastModifiedBy
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "modified_by_user_id")
    private AppUser lastModifiedBy;

    @Column(name = "created_ts")
    @CreatedDate
    @Temporal(TemporalType.TIMESTAMP)
    private Date createdDate;

    @Column(name = "modified_ts")
    @LastModifiedDate
    @Temporal(TemporalType.TIMESTAMP)
    private Date lastModifiedDate;

    // ...
}

我们JpaConfig:

@Configuration
@EnableJpaRepositories(basePackages = {
        "blah.blah.blah"})
@ComponentScan(basePackageClasses = {AuditorBean.class})
@EnableTransactionManagement
@EnableJpaAuditing(auditorAwareRef = "auditorBean")
public class JpaConfig extends BaseConfig {

    // ...

}

我们的AuditorBean:

@Component
public class AuditorBean implements AuditorAware<AppUser> {

    @Override
    public AppUser getCurrentAuditor() {
        // omitting some code that finds a user. I think the only relevant thing here
        // is that we're using the repo to find the user by ID and not using an
        // entity that's already been loaded
        return userRepository.findOne(id);
    }

}

Answer 1

我的建议是保持审计简单并定义

@CreatedBy
private Long createdBy;

没有实际关联并仅存储 AppUser 的 id。

@Component 公共类 AuditorBean 实现 AuditorAware {

@Override
public Long getCurrentAuditor() {
    // .... find out the id
    return id;
}

}