MappingException 休眠映射列

Question

我正在努力解决以下问题：

原因：org.hibernate.MappingException：外键 (FKj4uw5b6ekvxc2djohvon7lk7:bi_person_country_countries [person_country_id])) 的列数必须与 引用的主键（bi_person_country [country_id,person_id]）

我创建了 4 个模型：

@Table(name = "bi_country")
@Entity
public class Country {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

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

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(name = "bi_person_country", joinColumns = @JoinColumn(name = "country_id"), inverseJoinColumns = @JoinColumn(name = "person_id"))
    private Set<Person> persons;

性别：

@Table(name = "bi_gender")
@Entity
public class Gender {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

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

    public Integer getId() {
        return id;
    }

人：

@Table(name = "bi_person")
@Entity
public class Person {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "name")
    private String name;
    @Column(name = "last_name")
    private String lastName;
    @Column(name = "additional_info")
    private String additionalInfo;

    @ManyToMany(cascade = CascadeType.ALL, mappedBy = "persons")
    private Set<Country> countries;

    @ManyToOne
    private Gender gender;

个人国家：

@Table(name = "bi_person_country")
@Entity
public class PersonCountry {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @ManyToOne
    private Person person;

    @ManyToMany
    private List<Country> countries;

Answer 1

您不需要PersonCountry 类，因为您在这两种情况下都使用@ManyToMany 是Person 和Country 映射。

如果您出于某种原因必须保留它.. 链接表不应包含 @OneToMany / @ManyToMany 映射，因此您将拥有：

@ManyToOne
private Person person;

@ManyToOne
private Country country;

请记住，如果数据库名称不同于 person_id 和 country_id，您也可能需要使用 @JoinColumn。