java - 无需 Hibernate 的自定义 @Id 生成器

Question

以下 id 生成是否可以在不依赖 Hibernate @GenericGenerator 且仅使用纯 JPA 的情况下实现？

import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import org.hibernate.annotations.GenericGenerator;

@Entity
public class MyObject implements Serializable {

    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid", strategy = "my.IdGenerator")
    @Column(name = "ID", length = 36, nullable = false)
    private String id;

    // ...
}

Answer 1

您可以使用@PrePersist回调

@Id
@Column(name = "ID", length = 36, nullable = false)
private String id;

// ...

@PrePersist
public void prePersist() {
   id = UUID.randomUUID(); 
} 

有关生命周期回调的更多信息，请参见:Configuring a Life Cycle Callback Method on a JPA Entity