JPA映射@EmbeddedId与ManyToOne关系

Question

所以我在网上搜索了我的问题的答案，但没有找到有帮助的东西，基本上是需要在两个类之间有一个ManyToOne关系，其中一个类有一个EmbeddedId，我要把代码留在这里，错误信息是它给（我使用野蝇来运行服务器）。

公共类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;

}

@实体@Table（name=“inventario”，schema=“mxnextmob”）

公共类库存扩展基本模型{

@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;

}

公共类公司扩展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;

}

误差如下：

服务jboss。坚持小组。“mxnext mobile.war#mxnextmobiles”：org。冬眠AnnotationException:mappedBy引用未知的目标实体属性：br。通用域名格式。maxiconsystems。可移动的模型库存公司在br。通用域名格式。maxiconsystems。可移动的模型公司库存

Answer 1

有几种方法可以将你似乎拥有的东西映射为一张表，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;
}

这允许您使用库存整数作为主键；这简化了将来可能需要添加到清单中的任何引用，因为JPA中需要外键来引用其所有ID列。