Java 在数据库中保存后，无法在保存的实体中获取lastModifiedBy列

我创建了一个JPA实体，如下所示：

@Entity
@Table(name = "my_table")
public class MyEntity extends AbstractAuditingEntity implements Serializable {

  private static final long serialVersionUID = 1L;

  @Id
  @GeneratedValue(generator = "custom-uuid")
  @GenericGenerator(name = "custom-uuid",
      strategy = "generator.CustomUUIDGenerator")
  private String id;

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

  @Column(name = "description")
  private String description;

  @MappedSuperclass
  @EntityListeners(AuditingEntityListener.class)
  public abstract class AbstractAuditingEntity implements Serializable {

  private static final long serialVersionUID = 1L;

  @CreatedBy
  @Column(name = "created_by", nullable = false, length = 50, updatable = false)
  @JsonIgnore
  private String createdBy;

  @CreatedDate
  @Column(name = "created_date", updatable = false)
  @JsonIgnore
  private Instant createdDate = Instant.now();

  @LastModifiedBy
  @Column(name = "last_modified_by", length = 50)
  @JsonIgnore
  private String lastModifiedBy;

  @LastModifiedDate
  @Column(name = "last_modified_date")
  @JsonIgnore
  private Instant lastModifiedDate = Instant.now();

MyEntity如下所示：

@Entity
@Table(name = "my_table")
public class MyEntity extends AbstractAuditingEntity implements Serializable {

  private static final long serialVersionUID = 1L;

  @Id
  @GeneratedValue(generator = "custom-uuid")
  @GenericGenerator(name = "custom-uuid",
      strategy = "generator.CustomUUIDGenerator")
  private String id;

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

  @Column(name = "description")
  private String description;

  @MappedSuperclass
  @EntityListeners(AuditingEntityListener.class)
  public abstract class AbstractAuditingEntity implements Serializable {

  private static final long serialVersionUID = 1L;

  @CreatedBy
  @Column(name = "created_by", nullable = false, length = 50, updatable = false)
  @JsonIgnore
  private String createdBy;

  @CreatedDate
  @Column(name = "created_date", updatable = false)
  @JsonIgnore
  private Instant createdDate = Instant.now();

  @LastModifiedBy
  @Column(name = "last_modified_by", length = 50)
  @JsonIgnore
  private String lastModifiedBy;

  @LastModifiedDate
  @Column(name = "last_modified_date")
  @JsonIgnore
  private Instant lastModifiedDate = Instant.now();

摘要审计实体如下所示：

@Entity
@Table(name = "my_table")
public class MyEntity extends AbstractAuditingEntity implements Serializable {

  private static final long serialVersionUID = 1L;

  @Id
  @GeneratedValue(generator = "custom-uuid")
  @GenericGenerator(name = "custom-uuid",
      strategy = "generator.CustomUUIDGenerator")
  private String id;

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

  @Column(name = "description")
  private String description;

  @MappedSuperclass
  @EntityListeners(AuditingEntityListener.class)
  public abstract class AbstractAuditingEntity implements Serializable {

  private static final long serialVersionUID = 1L;

  @CreatedBy
  @Column(name = "created_by", nullable = false, length = 50, updatable = false)
  @JsonIgnore
  private String createdBy;

  @CreatedDate
  @Column(name = "created_date", updatable = false)
  @JsonIgnore
  private Instant createdDate = Instant.now();

  @LastModifiedBy
  @Column(name = "last_modified_by", length = 50)
  @JsonIgnore
  private String lastModifiedBy;

  @LastModifiedDate
  @Column(name = "last_modified_date")
  @JsonIgnore
  private Instant lastModifiedDate = Instant.now();

现在，我用以下语句更新DB中的实体：

MyEntity savedEntity = threatCanvasRepository.save(myEntity);

这里，在

savedEntity

对象中，

lastModifiedBy

设置为null

尽管如此，当我从DB获取相同的数据时，我能够看到lastModifiedBy已设置。我无法理解我在这里错过了什么

编辑

---

最奇怪的是，我在响应中得到了createdDate和lastModifiedDate，但不是createdBy和lastModifiedBy

我假设您的服务是

@Transactional

，然后

Repository.save（）

实际上并没有立即将其保存到数据库中，它将其添加到当前事务中以供以后处理<代码>@CreatedDate、

@CreatedBy

、

@LastModifiedBy

和

@LastModifiedDate

注释是在JPA实际提交事务时处理的（我假设是Hibernate）。因此，您需要在提交当前事务后从另一个服务获取。但通常情况下，你并不需要它。只要相信它们在DB中。

您在应用程序中启用了JPA审核吗

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.domain.AuditorAware;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;

@Configuration
@EnableJpaAuditing
public class JpaAuditingConfiguration {


    @Bean
    public AuditorAware<String> auditorProvider() {
        /*
          if you are using spring security, you can get the currently logged username with following code segment.
          SecurityContextHolder.getContext().getAuthentication().getName()
         */
        return new UsernameAuditorAware();
    }
}

import org.springframework.context.annotation.Bean；
导入org.springframework.context.annotation.Configuration；
导入org.springframework.data.domain.AuditorAware；
导入org.springframework.data.jpa.repository.config.EnableJpaAuditing；
@配置
@启用JPA审核
公共类JpaAuditingConfiguration{
@豆子
公共AuditorAware auditorProvider（）{
/*
如果您使用的是spring security，则可以使用以下代码段获取当前记录的用户名。
SecurityContextHolder.getContext（）.getAuthentication（）.getName（）
*/
返回新的用户名AuditorAware（）；
}
}

---

这是@LastModifiedBy批注工作所必需的。

您是否配置了

AuditingEntityListener

并实现了

AuditorAware

？是的，我配置了。最奇怪的是，我得到了createddate和lastModifiedDate，但没有得到createdBy和lastModifiedBy。你能给我们展示一下

AuditorAware

的实现吗？是的@Viktar你完全正确。是的，事实上我想要回复中的字段。但我想没有办法让这些场在同一个流中。