如何在注释中使用多个组件类型(Embedded, Embeddable)

Question

我谷歌，但所有的例子只显示我一个Component在一个对象，例如:

https://dzone.com/tutorials/java/hibernate/hibernate example/hibernate -映射组件-使用-注释- 1. - html

我想在一个对象中有两个Component，例如:

public class PhoneNumber {
   // Phone details
   private int areaCode = 0;
   private int phoneNumber = 0;
   private String name = null;
}
public class Person {
   private String firstName = null;
   private String nickName = null;
   private String lastName = null;
   // Multiple phone details
   private PhoneNumber homePhone = null;
   private PhoneNumber mobilePhone = null;
}

Hibernate映射:

<class name="Person" table="PERSON">
 <id name="id" column="PERSON_ID">
  <generator class="native"/>
 </id>
 <property name="firstName" column="FIRST_NAME" />
 ...
 <component name="homePhone" class="PhoneNumber">
  <property name="areaCode" column="HOME_AREA_CODE"/>
  <property name="phoneNumber" column="HOME_PHONE_NUMBER"/>
  <property name="name" column="HOME_NAME"/>
 </component>
 <component name="mobilePhone" class="PhoneNumber">
  <property name="areaCode" column="MOBILE_AREA_CODE"/>
  <property name="phoneNumber" column="MOBILE_PHONE_NUMBER"/>
  <property name="name" column="MOBILE_NAME"/>
 </component>
</class>

我上面有两个Component, homePhone和mobilePhone。如何将上述Hibernate映射转换为Java注释?

Answer 1

@Embeddable    
public class PhoneNumber {
 // Phone details
  private int areaCode = 0;
  private int phoneNumber = 0;
   private String name = null;
 }
 public class Person {
   private String firstName = null;
   private String nickName = null;
   private String lastName = null;
   // Multiple phone details
   @Embedded
   @AttributeOverrides({
   @AttributeOverride(name="areaCode",column=@Column(name="HOME_AREA_CODE"),
    @AttributeOverride(name="phoneNumber",column=@Column(name="HOME_PHONE_NUMBER"),
  @AttributeOverride(name="name",column=@Column(name="HOME_NAME")})
   private PhoneNumber homePhone = null;
  @Embedded
  @AttributeOverrides({
  @AttributeOverride(name="areaCode",column=@Column(name="MOBILE_AREA_CODE"),
  @AttributeOverride(name="phoneNumber",column=@Column(name="MOBILE_PHONE_NUMBER"),
  @AttributeOverride(name="name",column=@Column(name="MOBILE_NAME")})
   private PhoneNumber mobilePhone = null;
   }

用@Embeddable注释你的Phone类

对于每个电话组件，列名不同。使用@ attributeoverride并在您拥有的实体中指定适当的列名。这将把组件类映射到不同的列。