JPA 映射@EmbeddedId 與多對一關系

Question

所以我在互聯網上搜索了我的問題的答案，但沒有找到有幫助的東西，基本上需要在兩個類之間建立多對一關系，其中一個類具有 EmbeddedId，我將留下代碼這里和它給出的錯誤消息（我正在使用wildfly運行服務器）。

公共 class InventoryPK 實現可序列化 {

@ManyToMany(cascade = CascadeType.ALL)
@JoinColumn(name = "user_id")
private Item itemId;

@ManyToOne
@JoinColumn(name="CD_EMPRESA")
private Company company;

}

@Entity @Table(name = "inventario", schema = "mxnextmob")

公共 class 庫存擴展 BaseModel {

@EmbeddedId
private InventoryPK id;

@SequenceGenerator(schema = "mxnextmob", name = "inventory_sequence", sequenceName = "inventory_sequence", allocationSize = 1, initialValue = 1)
@GeneratedValue(strategy = GenerationType.AUTO, generator = "inventory_sequence")
private Integer inventory;

@Column
private BigDecimal quantity;

@Column
private BigDecimal weight;

}

公共 class 公司擴展 BaseModel {

@Id
@SequenceGenerator(schema = "mxnextmob", name = "company_sequence", sequenceName = "company_sequence", allocationSize = 1, initialValue = 1)
@GeneratedValue(strategy = GenerationType.AUTO, generator = "company_sequence")
private Integer code;

@Column
private String name;

@OneToMany(mappedBy = "company")
private List<UserSeller> userSeller;

@OneToMany(mappedBy = "id.company")
private List<Inventory> inventories;

}

錯誤如下：

service jboss.persistenceunit."mxnext-mobile.war#mxnextmobileDS": org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: br.com.maxiconsystems.mobile.model.Inventory.company in br.com.maxiconsystems.mobile .model.Company.inventory

Answer 1

map 有幾種方法可以使您看起來像一張桌子，但我建議將庫存更改為：

public class Inventory extends BaseModel {
  @Id
  @SequenceGenerator(schema = "mxnextmob", name = "inventory_sequence", sequenceName = "inventory_sequence", allocationSize = 1, initialValue = 1)
  @GeneratedValue(strategy = GenerationType.AUTO, generator = "inventory_sequence")
  private Integer inventory;

  @Embedded
  private InventoryPK alternateKey;

  @Column
  private BigDecimal quantity;

  @Column
  private BigDecimal weight;
}

這允許您使用庫存 Integer 作為其主鍵； 這簡化了您可能需要添加到 Inventory 的任何未來引用，因為在 JPA 中需要外鍵來引用其所有 ID 列。