Question

我的数据库中有这两个表：

CREATE TABLE classroom_trainee (
  id           BIGINT(20) NOT NULL AUTO_INCREMENT,
  trainee_id   BIGINT(20) NOT NULL,
  classroom_id BIGINT(20) NOT NULL,
  completed    BOOLEAN,
  notes        VARCHAR(255),
  result       INT(3),
  feedback     BOOLEAN             DEFAULT 0,
  PRIMARY KEY (id),
  FOREIGN KEY (trainee_id)
  REFERENCES user (id),
  FOREIGN KEY (classroom_id)
  REFERENCES classroom (id)
);

CREATE TABLE trainee_presence (
  id                   BIGINT(20) NOT NULL AUTO_INCREMENT,
  classroom_trainee_id BIGINT(20) NOT NULL,
  day                  INT(2) NOT NULL,
  presence             BOOLEAN,
  notes                VARCHAR(255),
  PRIMARY KEY (id),
  FOREIGN KEY (classroom_trainee_id)
  REFERENCES classroom_trainee (id)
);

这是我拥有的实体：

UserEntity.java：

.... 

public class UserEntity implements Serializable {

...

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

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "manager_id")
    private UserEntity manager;

    @Column(name = "email", nullable = false, unique = true)
    private String email;

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

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

...

ClassroomTraineeEntity.java

....

public class ClassroomTraineeEntity {

.....

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

    @ManyToOne
    @JoinColumn(name="trainee_id")
    private UserEntity trainee;

    @ManyToOne
    @JoinColumn(name="classroom_id")
    private ClassroomEntity classroom;
....

TraineePresenceEntity.java

....
public class TraineePresenceEntity {

.......

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

    @ManyToOne
    @JoinColumn(name="classroom_trainee_id")
    private ClassroomTraineeEntity classroomTrainee;

    @Column(name = "day")
    private Integer day;

    @Column(name = "presence")
    private Boolean presence;
...

在TraineePresenceEntity中我使用

@Column(name="classroom_trainee_id")
private Integer classroomTraineeId;

一切正常，花花公子，但有了ClassroomTraineeEntity对象，我得到了这个例外：

引起：org.hibernate.MappingException：外键（FKn85t08ggb5n6ail459koe0sm8：trainee_presence [classroom_trainee_id]））必须与引用的主键具有相同的列数（classroom_trainee [classroom_id，trainee_id]）

任何人都知道如何解决这个问题？

HIbernate外键必须与引用的主键Error具有相同的列数

0 个答案: