配置多对1双向关联

同样以商品和厂商为例,商品对厂商为多对1,则反过来,厂商对商品为1对多关系

public class Product {
	private Integer id;
	private String name;
	private double price;
	private Factory factory;
	public Product(){}
	public Product(Integer id){
		this.id=id;
	}
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public Factory getFactory() {
		return factory;
	}
	public void setFactory(Factory factory) {
		this.factory = factory;
	}
	
}

 

public class TestApplication7 {
	public static void main(String[] args) {
		Configuration configuration=new Configuration().configure();
		SessionFactory sessionFactory=configuration.buildSessionFactory();
		Session session=sessionFactory.openSession();
		Transaction transaction=session.beginTransaction();
		Integer(3));
		System.out.println(product.getName()+"===="+product.getFactory().getFactoryname());
		transaction.commit();*/	
		Factory factory=(Factory)session.get(Factory.class, new Integer(1));
		Set<Product>products =factory.getProducts();
		Iterator<Product> iterator=products.iterator();
		while(iterator.hasNext()){
			Product product=iterator.next();
			System.out.println(product.getName());
		}
		session.close();
	}

 

<hibernate-mapping>
	<!-- 每一个class类对应一个持久化对象 -->
	<class name="model.Factory" table="mw_factory">
		<id name="id">
		<!-- 主键的生成策略 -->
			<generator class="identity"></generator>
		</id>
		<property name="Factoryname" type="string" length="45">
			<column name="factoryName"></column>
		</property>
		<set name="products" inverse="true">
			<key column="factoryid"></key>
			<one-to-many class="model.Product"/>
		</set>
	</class>
</hibernate-mapping>

 

public class Factory {
	private int id;
	private String Factoryname;
	private Set<Product> products; 
	public Factory(){}
	
	public Factory(Integer id){
		this.id=this.id;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getFactoryname() {
		return Factoryname;
	}
	public void setFactoryname(String factoryname) {
		Factoryname = factoryname;
	}

	public Set<Product> getProducts() {
		return products;
	}

	public void setProducts(Set<Product> products) {
		this.products = products;
	}
	
	
	
}

 

<hibernate-mapping>
	<!-- 每一个class类对应一个持久化对象 -->
	<class name="model.Product" table="mw_product">
		<id name="id">
		<!-- 主键的生成策略 -->
			<generator class="identity"></generator>
		</id>
		<property name="name" type="string" length="45">
			<column name="name"></column>
		</property>
		<property name="price" type="double">
			<column name="price"></column>
		</property>
		<many-to-one name="factory" class="model.Factory" cascade="all">
			<column name="factoryid"></column>
		</many-to-one>
	</class>
</hibernate-mapping>