您需要
@OneToMany从映射
Country到
User实体，并
@ManyToOne从映射
User到
Country：
@Entity@Table(name = "country")public class Country { @Id @Column (name = "pre") private String pre; @Column (name = "name") private String name; @oneToMany(mappedBy = "country") private Set<User> users;}@Entity@Table(name = "user")public class User implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Integer id; @Column(name = "name") private String name; @ManyToOne @JoinColumn(name = "country_pre") private Country country;}
