Question

我已经在Spring应用程序中实现了审计列，当我创建一个新实体时，它会起作用，但是设置了列，但是当我更新实体时，我发现两个@Createdby和@CreatedDate设置为null，创建后，我使这些列不可更改：

@MappedSuperclass
public abstract class Audit implements Serializable {

    @CreatedBy
    private String createdBy;

    @CreatedDate
    private Date createdDate;

    @LastModifiedBy
    private String lastModifiedBy;

    @LastModifiedDate
    private Date lastModifiedDate;
}

Answer 1

对我来说它有效：

@MappedSuperclass
public class Auditor {

    @Column(name = "created_date", updatable = false)
    @CreatedDate
    private long createdDate;

    @Column(name = "modified_date")
    @LastModifiedDate
    private long modifiedDate;

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

    @Column(name = "modified_by")
    @LastModifiedBy
    private String modifiedBy;
}

并扩展类：

@Entity
@EntityListeners(AuditingEntityListener.class)
public class Material extends Auditor {

    @Id
    @SequenceGenerator(name = "seq_material", sequenceName = "seq_material")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "seq_material")
    private Long id;

    @Column
    @NotBlank(message = "Nome é um campo obrigatório!.", groups = validacaoProd.class)
    private String nome;

    More...
}

然后我更新了数据库中的记录：

update material set created_date = 1618418750189, modified_date = 1618418750189

Answer 2

您可以在类级别使用@DynamicUpdate。它将仅考虑更新列，而忽略其他列以放入UPDATE查询。

Ref：https://www.baeldung.com/spring-data-jpa-dynamicupdate

实体更新后，@ Createdby @CreatedDate为空

2 个答案: