java - Hibernate映射异常: One to None Mapping

Question

我正在尝试做一个简单的消息系统，但我遇到了严重的映射错误。这是类的示例

@Entity    
public class SMS {

    @Id
    @GeneratedValue
    @Column(name = "sms_id")
    private int id;


    private Korisnik sender;


    private Korisnik receiver;

    private String text;

这是 SMS 类中的 Korisnik 类

@Entity
public class Korisnik {

    @Id
    @Column(name = "user_num")
    private int id;

    private String name;


    public int getNumber() {
        return id;
    }

我如何设置类才能正确映射？

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'korisnikDaoImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.hibernate.SessionFactory com.sendsms.dao.impl.KorisnikDaoImpl.sessionFactory; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [com/sendsms/config/AppConfig.class]: Invocation of init method failed; nested exception is org.hibernate.MappingException: Could not determine type for: com.sendsms.model.Korisnik, at table: SMS, for columns: [org.hibernate.mapping.Column(receiver)]

Answer 1

将 @ManyToOne 添加到 SMS 实体中的 receiver 和 sender 字段。如果要指定列，请使用 @JoinColumn 注解而不是 @Column。