如何在Hibernate中将字段添加到POJO？

Question

I have three tables:

1. Catalog (PK: id, name, FK: genre_id, FK: type_id)
2. Type (PK: id, name)
3. Genre (PK: id, name)

How to use Hibernate to connect Genre and Type to Catalog by using annotation?

@Entity
@Table(name = "catalog")
public class Catalog implements Serializable {

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

    @Column(name = "product_name")
    private String productName;

    private Genre genre; // to add 
    private Type type;   // to add

    ...
}

Answer 1

If you want to connect Genre and Type to Catalog (is this what you mean?), you should include in both Genre and Type entities a Collection<Catalog> -typed field and annotate it with @OneToMany .

If not, the straightest way is to add the @ManyToOne annotation to Genre and Type fields in Catalog .