java - JPA Hibernate，如何在创建时进行验证并忽略更新时的验证

Question

我有以下实体:

@Entity
@Table(name = "bookings")
public class Booking {


    @Null
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private Long id;

    @Null
    @Column(name = "column1", columnDefinition = "VARCHAR(25) DEFAULT 'CREATED'")
    private String column1;

    //the rest of the fields....
}

这是一个简单的 Spring Boot 项目，规则是创建新行时不应该有 column1 数据(因此它使用值“CREATED”)，但是在行更新上我喜欢更改“ENDED”的值

有没有办法告诉 Hibernate 仅在创建新行时进行验证，而在更新行时忽略验证？

Answer 1

看看

@PrePersist Executed before the entity manager persist operation is actually executed or cascaded. This call is synchronous with the persist operation.

@PreUpdate Executed before the database UPDATE operation.

      @PrePersist
      protected void onCreate() {
        column1 = "CREATED";
      }

      @PreUpdate
      protected void onUpdate() {
        column1 = "ENDED";
      }

参见https://docs.jboss.org/hibernate/core/4.0/hem/en-US/html/listeners.html