Question

我正在尝试制作复合主键映射，但不起作用。

必要条件是：

该关系可能与$folder = preg_replace('/\.php$/', '', $file);注释
我需要与人实体的关系为@IdClass

我的代码：

@ManyToOne

他们正试图坚持下去：

@Entity
@IdClass(PhonePK.class)
public class Phone implements Serializable{
    @Id
    @Column(name = "codigo", nullable = false)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long code;

    @Id
    @ManyToOne
    @JoinColumn(name = "person", referencedColumnName = "code", nullable = false)
    private Person person;

    @Basic
    @Column(name = "number", nullable = false)
    private Integer number;

    //getters and setters
    //equals and hashcode
}

public class PhonePK implements Serializable {
    private Long code;
    private Long person;

    public PhonePK(){}

    public PhonePK(Long code, Long person) {
        this.code = code;
        this.person = person;
    }

    //getters and setters
    //equals and hashcode
}

public class Person implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "code", nullable = false)
    private Long code;

    //getters and setters
    //equals and hashcode
}

我收到的错误是：

引起：javax.persistence.PersistenceException：org.hibernate.HibernateException：复合标识符的任何部分都不能为空

Answer 1

您在电话实体上设置的人很可能还没有ID。坚持不会garante和身份证。建议您也刷新交易。

复合标识符的任何部分都不能为空

2 个答案: