hibernate 自身表關聯的多對一,一對多關係的實現
阿新 • • 發佈:2019-02-16
需求如下:分類的資料表:id,parentid,name 要求,取出該分類的時候,同時得到該分類的父分類以及所有的子分類.分類模型如下
@NotFound就是為了解決頂級分類沒有父分類,可能hibernate會報:@Entity(name = tbl_commodity_sales_category) public class SaleCategory { @Id @GeneratedValue @Column(name = "id") private String id; @Column(name = "category_name") private String categoryName; @ManyToOne @JoinColumn(name = "parent") @NotFound(action=NotFoundAction.IGNORE) private SaleCategory parentCategory; @OneToMany @JoinColumn(name = "parent",nullable = true) private List<SaleCategory> subCategories; @Column(name = "category_no") private String categoryNo; @Column(name = "level") private int level; @Column(name = "last_flag") private String isLast; }
No row with the given identifier exists 這個錯誤