关联关系-动手-一对一单向主键(不重要)

/**
 * Person类中有一个属性指向另外一个实体,但是另外一个实体没有属性指向Person,所以单向
 * 由于Person表中是主键属性关联,所以主键,它的主键id是根据Address的主键id而来,因此不能使用代理主键
 * @author Macrotea
 *
 */
public class Person {
	private int id;
	private String name;
	private Address address;
	
	public Address getAddress() {
		return address;
	}
	public int getId() {
		return id;
	}
	public String getName() {
		return name;
	}
	public void setAddress(Address address) {
		this.address = address;
	}
	public void setId(int id) {
		this.id = id;
	}
	public void setName(String name) {
		this.name = name;
	}
	@Override
	public String toString() {
		return "Person [id=" + id + ", name=" + name + "]";
	}
}


public class Address {
	private int id;
	private String city;
	public String getCity() {
		return city;
	}
	public int getId() {
		return id;
	}
	public void setCity(String city) {
		this.city = city;
	}
	public void setId(int id) {
		this.id = id;
	}
	@Override
	public String toString() {
		return "Address [city=" + city + ", id=" + id + "]";
	}
}


	private static void prepare_data() {

		Session session = HibernateSessionFactory.getSession();
		Transaction transaction = session.beginTransaction();
		transaction.begin();

		Address addr = new Address();
		addr.setCity("广州");

		Person p = new Person();
		p.setName("macrotea");
		p.setAddress(addr);

		session.save(addr);
		session.save(p);

		transaction.commit();
		session.close();
	}

 

 

 

<hibernate-mapping package="com.macrotea.hb.model">
	<class name="Person">
		<id name="id">
            <!--基于主键关联,主键生成策略是foreign,说明根据关联类生成主键-->
            <generator class="foreign">
                <!--关联类的属性名-->
                <param name="property">address</param>
            </generator>
		</id>
		<property name="name" />
		<one-to-one name="address" constrained="true"></one-to-one>
	</class>
</hibernate-mapping>



<hibernate-mapping package="com.macrotea.hb.model">
	<class name="Address">
		<id name="id">
			<generator class="native" />
		</id>
		<property name="city" />
	</class>
</hibernate-mapping>