@Column 省略背上的鍋

今天修改實體類時項目啓動報錯：

org.hibernate.MappingException: Unable to find column with logical name: product_type_id in org.hibernate.mapping.Table(product_type_view) and its related supertables and secondary tables

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添加一對多後啓動報錯，添加@Column後，正常啓動

@Getter
@Setter
@Entity
@Table(name = "product_type_view")
public class ProductTypeView {

  /** 產品類型id {@link ProductType#id} */
  @Id
  @Column(name = "product_type_id")
  private Long productTypeId;

  /** 產品類型名 */
  private String productTypeName;
  /**
   * 父級產品id {@link ProductType#parentId}<br>
   * </>（若爲頂級產品類型，則此項爲0{@link ProductType#DEFAULT_TOP_PARENT_ID}）
   */
  @Column(name = "super_type_id")
  private Long superTypeId;

  /** 級聯查詢數據結構 級聯查詢成功 */
  @OneToMany(targetEntity = ProductTypeView.class, fetch = FetchType.LAZY)
  @JoinColumn(name = "super_type_id", referencedColumnName = "product_type_id")
  List<ProductTypeView> childProductTypeList = new ArrayList<>();
}

 

（此爲jpa的自關聯查詢，一對多且自身維護外鍵，不能同時添加@ManyToOne，否則報錯無法啓動項目）

 

--------------項目試用JPA自關聯查詢，此外附上--------------------------------------

自關聯sql查詢語句示例：

SELECT
--     pa.id as id,
--     pa.product_type_name AS pa_type_name,
--     pb.parent_id AS parent_id,
--     pb.id as pb_id,
--     pb.product_type_name as pb_type_name

*
FROM
    `product_type_view` AS pa
    JOIN product_type_view AS pb ON pa.product_type_id=pb.super_type_id