组件关联映射可以将一些简小的数据与主题放在一个表中，例如firstName 和LastName这两个结合在一起可以组成一个名字，但是再分别将这两个再建一个表就不太合适了，这个时候可以用到组件关联映射；

hibernate.cfg.xml:

<hibernate-configuration><session-factory name="sessionFactory"><property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property><property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property><property name="hibernate.connection.url">jdbc:mysql://localhost:3306/spring?useUnicode=true&characterEncoding=UTF-8</property><property name="hibernate.connection.username">root</property><property name="hibernate.connection.password"></property><property name="hibernate.show_sql">true</property><property name="hibernate.format_sql">true</property><property name="hibernate.hbm2ddl.auto">update</property><mapping resource="cn/hbm/Person2.hbm.xml" /></session-factory>
</hibernate-configuration>

Person:

public class Person2 {private Integer id;private Name name;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public Name getName() {return name;}public void setName(Name name) {this.name = name;}}

name:

public class Name {private String firstName;private String lastName;public String getFirstName() {return firstName;}public void setFirstName(String firstName) {this.firstName = firstName;}public String getLastName() {return lastName;}public void setLastName(String lastName) {this.lastName = lastName;}
}

hbm.xml

<hibernate-mapping package="cn.model"><class name="Person2" table="PERSON2"><id name="id" column="ID"><generator class="native"></generator></id><component name="name"><property name="firstName" column="FIRST_NAME" /><property name="lastName" column="LAST_NAME" /></component></class>
</hibernate-mapping>

    public void saveZujian(){Session session=null;Transaction tran=null;try{Person2 person=new Person2();Name name=new Name();name.setFirstName("jack");name.setLastName("tomson");person.setName(name);session=HibernateSessionFactory.getSession();tran=session.beginTransaction();session.save(person);tran.commit();}catch(Exception e){if(session!=null){session.close();}}}

执行保存以后可看到生成的SQL

确实创建在一张表中了。

执行查询：

public Person2 getPersonById(Integer id){Session session=null;try{session=HibernateSessionFactory.getSession();return (Person2)session.get(Person2.class, id);}catch(Exception e){if(session!=null){session.close();}}return null;}