如何使created_at列像自动创建ID一样自动生成创建日期时间? [英] How can you make a created_at column generate the creation date-time automatically like an ID automatically gets created?

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-文档
• @UpdateTimestamp-文档

• @CreationTimestamp - Documentation
• @UpdateTimestamp - Documentation

Spring Data JPA

• @CreatedDate-文档
• @LastModifiedDate-文档

• @CreatedDate - Documentation
• @LastModifiedDate - Documentation

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