Hibernate通过Composite-element配置外联表实例 (码)

摘自圣思园Hibenrate 26. 组件映射深度解析 -37分钟

文件： Student.java, Contact.java, Student.hbm.xml


Student.java

public class Student
{
	private String id;
	
	private String name;
	
	private Set contacts=new HashSet();
}

public class Contact
{
	private String method;
	
	private String address;
}

Student.hbm.xml

<hibernate-mapping package="component">
	<class name="Student" table="test_student">
	
 		<id name="id" column="id" type="string">
 			<generator class="uuid"></generator>
 		</id>
 		
 		
 		<property name="name" column="name" type="string"/>
 		
 		
 		<set name="contacts" table="contact">
 			<key column="student_id"></key>
 			
 			<!-- 这里配置了关联表Contact的元素 -->
 			<composite-element class="Contact">
 				<property name="method" type="string"/>
 				<property name="address" type="string"/>
 			
 			</composite-element>
 			
 		</set>
 		
 	
	</class>



</hibernate-mapping>

         
         
     

生成SQL：
Hibernate: create table contact (student_id varchar2(255 char) not null, method varchar2(255 char), address varchar2(255 char))
Hibernate: create table test_student (id varchar2(255 char) not null, name varchar2(255 char), primary key (id))
Hibernate: alter table contact add constraint FK_r3jhjlmx2uie72qpg7l3sedib foreign key (student_id) references test_student




插入

	Session session=HibernateUtil.openSession();
		
		
		Contact c1=new Contact("phone","233333","1");
		Contact c2=new Contact("qq","233333","1");
		
		Student s=new Student("1", "li",ArraysHelper.asSet(c1,c2) );
		
		session.save(s);
		
		Transaction tx=session.beginTransaction();
		
		tx.commit();

结果：