后台开发问题集锦

SpringBoot：a different object with the same identifier value was already associated with the session

@Entity
@Table(name = "seat")
public class Seat {
	@Id
  @GeneratedValue(strategy = GenerationType.AUTO)
	private int id;
	@NotNull
	// 座位所在楼层
	private int floor;
	@NotNull
	// 座位编号
	private int number;
	@NotNull
	// 座位状态，0表示空闲，1表示占用
	private int idle;

只需将@GeneratedValue(strategy = GenerationType.AUTO)去掉