本文介绍了如何使created_at列像自动创建ID一样自动生成创建日期时间?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我目前有一个实体，如下所示:
I currently have an Entity as below:
@Entity
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long productId;
private String productImage;
private String productTitle;
private String productDescription;
private Integer productPrice;
private Date createdAt;
private Date updatedAt;
在创建此对象时，createdAt和updatedAt的值在数据库中显示为空，并且想知道如何实现代码，以便自动插入createdAt和updateAt?
Upon creation of this object, the value of createdAt and updatedAt shows null in the database and was wondering how I can implement code so that createdAt and updateAt automatically gets inserted?
我的发布方法如下:
@PostMapping("/products")
public ProductResponse createProduct(@Validated @RequestBody ProductForm productForm) {
Product product = productForm.asProduct();
Product createdProduct = productRepository.save(product);
return new ProductResponse(createdProduct, "Product created");
}
推荐答案
JPA
没有什么比直接注释Timestamp字段更方便的了，但是您可以使用@PrePersist，@PreUpdate注释，并且可以毫不费力地获得相同的结果.
There isn't anything as convenient as annotating the Timestamp field directly but you could use the @PrePersist, @PreUpdate annotations and with little effort achieve the same results.
休眠
@CreationTimestamp- Documentation@UpdateTimestamp- Documentation
Spring Data JPA
@CreatedDate- Documentation@LastModifiedDate- Documentation
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