Question

使用JPA annoations，我想重用相同的嵌入对象：

@Entity
public class User {
    @Embedded
    public Address homeAddress;

    @Embedded
    public Address workAddress;
}

@Embeddable
public class Address {
    public String code;
    public String city;
    ...
}

我可以使用@AttributeOverrides，@ AttributeOverride和@Column指定SQL列名，但它是verbos。是否可以仅指定添加到homeAddress和workAddress的每列的前缀？

谢谢，

济

Answer 1

如果您想使用多个相同的Embedded课程。您必须为所有列执行@AttributeOverrides。试试如下;

参考JPA AttributeOverrides

@Embeddable
public class Address {
    private String state;
    @Column(name = "zip_code")
    private String zip;
}

@Entity(name = "Employee")
public class Employee implements Serializable {
    @Embedded
    @AttributeOverrides({
        @AttributeOverride(name = "state", column = @Column(name = "province_1")),                       
        @AttributeOverride(name = "zip", column = @Column(name = "postal_code_2"))
    })
    private Address address_1;  

    @Embedded
    @AttributeOverrides({
        @AttributeOverride(name = "state", column = @Column(name = "province_2")),                       
        @AttributeOverride(name = "zip", column = @Column(name = "postal_code_2"))
    })
    private Address address_2;  

}

我的建议是，Embedded中有一个或多个Entity值。尝试使用@CollectionTable。

@CollectionTable(name = "EMPLOYEE_ADDRESS", joinColumns = @JoinColumn(name = "ADDRESS_ID"))
private List<Address> addressList;

参考JPA CollectionTable

Answer 2

有同样的问题，这是解决方案。完美的工作，前缀字段名称与嵌入属性的名称（在您的情况下为homeAddress_和workAddress _）

https://stackoverflow.com/a/3046725/4252764

Answer 3

为我添加此功能（尽管我将hibernate用作JPA提供程序）

<property name="hibernate.implicit_naming_strategy" value="org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl" />

带有前缀的JPA Multiple Embedded字段？

3 个答案: