JPA，将复杂数据类型放在同一张表中的实体内

Question

我有一个类 Customer，它是一个实体： @实体

public class Customer {
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="customerId_Sequence")
@SequenceGenerator(name="customerId_Sequence",sequenceName="CUSTOMER_SEQ",allocationSize=1)
private long customerId;
private String firstName;
private String lastName; 
private BillingDetails billingDetails

我有一个类似于 BillingDetails 的类：

public class BillingDetails {
private String type;
private long ccNumber;

我使用休眠作为我的持久性提供程序。我希望它在 sql 中只创建一个表，其中包含 customerId、firstName、lastName、type、ccNumber 列。我希望所有内容都在一张表中，我不希望帐单详细信息成为一个实体。这可能吗？

当我这样尝试时，我收到一个错误：无法确定类型：****.BillingDetails

Answer 1

将 BillingDetails 建模为 @Embeddable。

@Entity
public class Customer {
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="customerId_Sequence")
@SequenceGenerator(name="customerId_Sequence",sequenceName="CUSTOMER_SEQ",allocationSize=1)
private long customerId;
private String firstName;
private String lastName; 

@Embedded
private BillingDetails billingDetails;
...
}



@Embeddable
public class BillingDetails {
private String type;
private long ccNumber;
...
}