【Hibernate学习笔记-6.1】无连接表的N-1关联（单向）

package org.crazyit.app.domain;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="address_inf")
public class Address
{
	// 标识属性
	@Id @Column(name="address_id")
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	private int addressId;
	// 定义地址详细信息的成员变量
	private String addressDetail;
	// 无参数的构造器
	public Address()
	{
	}
	// 初始化全部成员变量的构造器
	public Address(String addressDetail)
	{
		this.addressDetail = addressDetail;
	}
	// addressId的setter和getter方法
	public void setAddressId(int addressId)
	{
		this.addressId = addressId;
	}
	public int getAddressId()
	{
		return this.addressId;
	}
	// addressDetail的setter和getter方法
	public void setAddressDetail(String addressDetail)
	{
		this.addressDetail = addressDetail;
	}
	public String getAddressDetail()
	{
		return this.addressDetail;
	}
}

package org.crazyit.app.domain;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;
@Entity
@Table(name="person_inf")
public class Person
{
	// 标识属性
	@Id @Column(name="person_id")
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	private Integer id;
	private String name;
	private int age;
	
	// 定义该Person实体关联的Address实体
	@ManyToOne(targetEntity=Address.class)
	// 映射外键列，指定外键列的列名为address_id、不允许为空
	@JoinColumn(name="address_id" , nullable=false)
	@Cascade(CascadeType.ALL)
	private Address address;
	// id的setter和getter方法
	public void setId(Integer id)
	{
		this.id = id;
	}
	public Integer getId()
	{
		return this.id;
	}
	// name的setter和getter方法
	public void setName(String name)
	{
		this.name = name;
	}
	public String getName()
	{
		return this.name;
	}
	// age的setter和getter方法
	public void setAge(int age)
	{
		this.age = age;
	}
	public int getAge()
	{
		return this.age;
	}
	// address的setter和getter方法
	public void setAddress(Address address)
	{
		this.address = address;
	}
	public Address getAddress()
	{
		return this.address;
	}
}

package lee;
import org.crazyit.app.domain.Address;
import org.crazyit.app.domain.Person;
import org.hibernate.Session;
import org.hibernate.Transaction;
public class PersonManager
{
	public static void main(String[] args)
	{
		PersonManager mgr = new PersonManager();
		mgr.testCascase();
		HibernateUtil.sessionFactory.close();
	}
private void testCascase()
{
	Session session = HibernateUtil.currentSession();
	Transaction tx = session.beginTransaction();
	Person p = new Person();
	Address a = new Address("SuZhou");          // ①
	p.setName("ZhangSan");
	p.setAge(21);
	p.setAddress(a);
	// 持久化Person对象
	session.persist(p);
	// 创建一个瞬态的Address对象
	Address a2 = new Address("ShangHai");         // ②
	// 修改持久化状态的Person对象
	p.setAddress(a2);                             // ③
	tx.commit();
	HibernateUtil.closeSession();
}
private void testPerson()
{
	Session session = HibernateUtil.currentSession();
	Transaction tx = session.beginTransaction();
	// 创建一个Person对象
	Person p = new Person();
	// 设置Person的name为crazyit字符串
	p.setName("WangWu");
	p.setAge(21);
	// 持久化Person对象(对应于插入主表记录)
	session.save(p);
	// 创建一个瞬态的Address对象
	Address a = new Address("GuangZhou");        // ①
	// 先设置Person和Address之间的关联关系
	p.setAddress(a);
	// 再持久化Address对象(对应于插入从表记录)
	session.persist(a);
	// 创建一个瞬态的Address对象
	Address a2 = new Address("BeiJing");      // ②
	// 先设置Person和Address之间的关联关系
	p.setAddress(a2);
	// 再持久化Address对象(对应于插入从表记录)
	session.persist(a2);                       // ③
	tx.commit();
	HibernateUtil.closeSession();
}
}