JavaPersistenceWithHibernate第二版笔记-第五章-Mapping value types-003使用@AttributeOverrides

Each @AttributeOverride for a component property is “complete”: any JPA or Hibernate annotation on the overridden property is ignored. This means the @Column annotations on the Address class are ignored—all BILLING_* columns are NULL able!(Bean Validation still recognizes the @NotNull annotation on the component property, though; Hibernate only overrides persistence annotations.)

 1 package org.jpwh.model.simple;
 2 
 3 import org.jpwh.model.Constants;
 4 
 5 import javax.persistence.AttributeOverride;
 6 import javax.persistence.AttributeOverrides;
 7 import javax.persistence.Column;
 8 import javax.persistence.Embedded;
 9 import javax.persistence.Entity;
10 import javax.persistence.GeneratedValue;
11 import javax.persistence.Id;
12 import javax.persistence.Table;
13 import java.io.Serializable;
14 import java.math.BigDecimal;
15 
16 @Entity
17 @Table(name = "USERS")
18 public class User implements Serializable {
19 
20     @Id
21     @GeneratedValue(generator = Constants.ID_GENERATOR)
22     protected Long id;
23 
24     public Long getId() {
25         return id;
26     }
27 
28     protected String username;
29 
30     public User() {
31     }
32 
33     public String getUsername() {
34         return username;
35     }
36 
37     public void setUsername(String username) {
38         this.username = username;
39     }
40 
41     // The Address is @Embeddable, no annotation needed here...
42     protected Address homeAddress;
43 
44     public Address getHomeAddress() {
45         return homeAddress;
46     }
47 
48     public void setHomeAddress(Address homeAddress) {
49         this.homeAddress = homeAddress;
50     }
51 
52     @Embedded // Not necessary...
53     @AttributeOverrides({
54             @AttributeOverride(name = "street",
55                     column = @Column(name = "BILLING_STREET")), // NULLable!
56             @AttributeOverride(name = "zipcode",
57                     column = @Column(name = "BILLING_ZIPCODE", length = 5)),
58             @AttributeOverride(name = "city",
59                     column = @Column(name = "BILLING_CITY"))
60     })
61     protected Address billingAddress;
62 
63     public Address getBillingAddress() {
64         return billingAddress;
65     }
66 
67     public void setBillingAddress(Address billingAddress) {
68         this.billingAddress = billingAddress;
69     }
70 
71     public BigDecimal calcShippingCosts(Address fromLocation) {
72         // Empty implementation of business method
73         return null;
74     }
75 
76     // ...
77 }