Spring Boot 自动生成带属性的关联表

Question

我在数据库中自动生成实体，使用效果很好：

spring.jpa.hibernate.ddl-auto=update

现在我需要关联表中的一个附加属性，如果不手动创建关联实体，我无法弄清楚。下面列出的当前类生成一个没有附加属性的关联表。

我需要的桌子：

    persons:
    id
    
    search_requests:
    id
    
    search_requests_persons:
    person_id
    search_request_id
    study_id  

我目前拥有的课程（简化）：

@NoArgsConstructor
@RequiredArgsConstructor(staticName = "of")
@Getter
@Setter
@Entity
@EqualsAndHashCode
@Table(name = "persons")
public class Person {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
    private Long id;
    
    // The following line is what I would need
    // private List<Integer> studyIds;
}

@NoArgsConstructor
@RequiredArgsConstructor(staticName = "of")
@Getter
@Setter
@Entity
@EqualsAndHashCode
@Table(name = "search_requests")
public class SearchRequest {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
    private Long id;

    @NonNull
    @ManyToMany
    private List<Person> persons;
}

我将 Lombok 和 Javax Persistence 用于注释。

Answer 1

为了在您的JoinTable 中添加其他属性，您可以手动创建您的JoinTable 实体。例如： PersonSearchRequest.java

@Entity
@Table(name = "person_search_request)
@Getter
@Setter
@NoArgsConstructor
public class PersonSearchRequest {
    @EmbeddedId
    private PersonSearchRequestPK id;
    
    // put your additional attribute here, e.g:
    private String attribute1;
    private Long attribute2;
    @ElementCollection
    private List<String> attribute3s; 

    @Embeddable
    @Getter
    @Setter
    @AllArgsConstructor
    @NoArgsConstructor
    public static class PersonSearchRequestPK implements Serializable {
        @ManyToOne(fetch = FetchType.LAZY)
        private Person person;

        @ManyToOne(fetch = FetchType.LAZY)
        private SearchRequest searchRequest;
    }

}

Person.java

@NoArgsConstructor
@RequiredArgsConstructor(staticName = "of")
@Getter
@Setter
@Entity
@EqualsAndHashCode
@Table(name = "persons")
public class Person {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
    private Long id;
    
    @OneToMany(mappedBy = "id.person")
    private List<PersonSearchRequest> personSearchRequests;
}

SearchRequest.java

@NoArgsConstructor
@RequiredArgsConstructor(staticName = "of")
@Getter
@Setter
@Entity
@EqualsAndHashCode
@Table(name = "search_requests")
public class SearchRequest {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
    private Long id;

    @OneToMany(mappedBy = "id.searchRequest")
    private List<PersonSearchRequest> personSearchRequests;
}