Hibernate xml配置方法之OneToMany(單向關聯關係)

Java代碼如下：

package com.lwp.hibernate.Model;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

public class Customer implements Serializable{
	
	private static final long serialVersionUID = 1L;

	public Customer(){}
	public Customer(String name,Set<Order> orders){
		this.name=name;
		this.orders = orders;
	}

	private Long id;
	
	private String name;
	
	private Set<Order> orders = new HashSet<Order>();

	public Set<Order> getOrders() {
		return orders;
	}
	public void setOrders(Set<Order> orders) {
		this.orders = orders;
	}
	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
}

package com.lwp.hibernate.Model;

import java.io.Serializable;

public class Order implements Serializable{

	private static final long serialVersionUID = 1L;
	public Order(){}

	public Order(String orderNumber){
		this.orderNumber =orderNumber;
	}
	
	private Long id;
	
	private String orderNumber;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getOrderNumber() {
		return orderNumber;
	}

	public void setOrderNumber(String orderNumber) {
		this.orderNumber = orderNumber;
	}
}

import java.util.HashSet;
import java.util.Set;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

import com.lwp.hibernate.Model.Customer;
import com.lwp.hibernate.Model.Order;

public class CustomerTest {

	public static void main(String[] args) {
		new SchemaExport(new AnnotationConfiguration().configure("/hibernate.cfg.xml")).create(true, false);
		
		Set<Order> orders =  new HashSet<Order>();
		Order order1 = new Order("Tom_Order001");
		Order order2 = new Order("Tom_Order002");
		orders.add(order1);
		orders.add(order2);
		Customer customer = new Customer("Tom",orders);
		save(order1);
		save(order2);
		save(customer);
	}

	public static void save(Object o){
		Configuration cfg = new Configuration();//xx.hbm.xml形式下的new  
		//Configuration cfg = new AnnotationConfiguration(); //Annotation形式下的new 
		SessionFactory sf = cfg.configure().buildSessionFactory();
		Session session = sf.openSession();
		session.beginTransaction();
		session.save(o);
		session.getTransaction().commit();
		session.close();
		sf.close();
	}
}

xml代碼如下：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.lwp.hibernate.Model.Customer">
		<id name="id" type="long" column="ID" >
			<generator class="increment"/>
		</id>
		<property name="name" type="string">
			<column name="NAME" length="15"></column>
		</property>
		<set name="orders"  >  
                <key column="customer_id"></key>  
                <one-to-many class="com.lwp.hibernate.Model.Order"/>  
        </set>   
    </class>
</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.lwp.hibernate.Model.Order" table="ORDERS">
		<id name="id" type="long" column="ID" >
			<generator class="increment"/>
		</id>
		<property name="orderNumber" type="string">
			<column name="ORDER_NUMBER" length="15"></column>
		</property>
    </class>
</hibernate-mapping>

生成的SQL如下：

alter table ORDERS drop foreign key FK8B7256E5C1E4F651
drop table if exists Customer
drop table if exists ORDERS
create table Customer (ID bigint not null, NAME varchar(15), primary key (ID))
create table ORDERS (ID bigint not null, ORDER_NUMBER varchar(15), customer_id bigint, primary key (ID))
alter table ORDERS add index FK8B7256E5C1E4F651 (customer_id), add constraint FK8B7256E5C1E4F651 foreign key (customer_id) references Customer (ID)
Hibernate: select max(ID) from ORDERS
Hibernate: insert into ORDERS (ORDER_NUMBER, ID) values (?, ?)
Hibernate: select max(ID) from ORDERS
Hibernate: insert into ORDERS (ORDER_NUMBER, ID) values (?, ?)
Hibernate: select max(ID) from Customer
Hibernate: insert into Customer (NAME, ID) values (?, ?)
Hibernate: update ORDERS set customer_id=? where ID=?
Hibernate: update ORDERS set customer_id=? where ID=?

數據結構和前面的ManyToOne一樣。