将JPA实体一分为二？

Question

假设我拥有以下实体：

@Entity
@Table (name = "customers)
public class CustomerImpl implements Customer {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", nullable = false, unique = true)
private Long id;

@Column(name = "name", nullable = false)
private String name;

@Column(name = "surname", nullable = false)
private String surname;

@Column(name = "country", nullable = false)
private String country;

@Column(name = "city", nullable = false)
private String city;

@Column(name = "street", nullable = false)
private String street;

@Column(name = "zipCode", nullable = false)
private String zipCode;

// constructor + getters

}

我想创建一个名为Address的新类，它将包含国家、街道、城市和邮政编码变量。然后将用Address对象替换列出的变量，以使代码更可读、更清晰。

在我的例子中，地址类应该嵌入还是应该将其分配为新实体，并在地址和客户之间给出@OneToOne关系？

谢谢你

Answer 1

为了使代码更具可读性和更清晰，您应该创建一个包含country、city。。。，然后你可以像这样使用@OneToOne关系：

在客户类中：

@OneToOne(mappedBy = "customer", fetch = FetchType.LAZY)
private Address address;
// Getter + Setter

在ADRESE类中：

@OneToOne
@JoinColumn(name="id")
private Customer customer;