JPA 映射@EmbeddedId 与多对一关系

Question

所以我在互联网上搜索了我的问题的答案，但没有找到有帮助的东西，基本上需要在两个类之间建立多对一关系，其中一个类具有 EmbeddedId，我将留下代码这里和它给出的错误消息（我正在使用wildfly运行服务器）。

公共 class InventoryPK 实现可序列化 {

@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 库存扩展 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 公司扩展 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;

}

错误如下：

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 有几种方法可以使您看起来像一张桌子，但我建议将库存更改为：

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;
}

这允许您使用库存 Integer 作为其主键； 这简化了您可能需要添加到 Inventory 的任何未来引用，因为在 JPA 中需要外键来引用其所有 ID 列。