Question

我正在尝试实施一个会议模型，其中包含多个具有相应数量的设备实体。在会议上，用户应该能够CRUD设备和会议设备的数量

数据库：

CREATE TABLE IF NOT EXISTS equipment (
  equipment_id   SERIAL PRIMARY KEY,
  equipment_name VARCHAR(20) NOT NULL
);

CREATE TABLE IF NOT EXISTS meeting (
  meeting_id     SERIAL PRIMARY KEY,
  meeting_time   TIMESTAMP    NOT NULL,
  number_people  INTEGER      NOT NULL,
  setup          VARCHAR(255)
);

CREATE TABLE IF NOT EXISTS meeting_equipment (
  meeting_equipment_id SERIAL PRIMARY KEY ,
  meeting_id   INTEGER NOT NULL REFERENCES meeting (meeting_id),
  equipment_id INTEGER NOT NULL REFERENCES equipment (equipment_id),
  quantity INTEGER NOT NULL DEFAULT 0
);

实体实施：

@Entity
@Table(name = "meeting")
@Data
public class Meeting {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "meeting_id", updatable = false)
    @JsonIgnore
    private int id;

    @Column(name = "meeting_time")
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm")
    @NotNull
    private LocalDateTime meetingTime;

    @Column(name = "number_people")
    @NotNull
    @Min(1)
    private int numberPeople;

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

    @OneToMany(mappedBy = "meeting", cascade = CascadeType.ALL)
    @JsonManagedReference
    List<MeetingEquipment> equipmentList = new ArrayList<>();
}


@Entity
@Table(name = "equipment")
@Data
public class Equipment {
    @Id
    @Column(name = "equipment_id", updatable = false)
    @JsonIgnore
    private int id;

    @NotNull
    @Column(name = "equipment_name", unique = true)
    @Size(min = 1, max = 100)
    private String equipmentName;
}

加入表metting_equipment：

@Entity
@Table(name = "meeting_equipment", uniqueConstraints = {
        @UniqueConstraint(columnNames = {"meeting_id", "equipment_id"})})
@Data
public class MeetingEquipment {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "meeting_equipment_id", updatable = false)
    @JsonIgnore
    private int id;

    @ManyToOne
    @JoinColumn(name = "meeting_id")
    @NotNull
    @JsonBackReference
    private Meeting meeting;

    @ManyToOne
    @JoinColumn(name = "equipment_id")
    @NotNull
    private Equipment equipment;

    @Column(name = "quantity")
    @NotNull
    private int quantity;
}

使用上面的代码，我可以成功创建包含设备的会议（从创建方法返回的JSON显示正确的内容）。但是一旦我尝试删除会议实体中的deviceList元素，它就不会删除meetingEquipment实体。我试过了 meeting.getEquipmentList().clear()和meetingEquipmentDao.delete(meeting.getEquipmentList())都不起作用。谁能告诉我这个问题的原因，谢谢！

Spring数据JPA连接表有额外的列

0 个答案: