【hibernate实例】赵雅智_双向多对一客户与订单增加查找修改

新建持久化类

Order.java

package www.hbsi.net.one2manyboth;public class Order {private int id;private String no;private Customer customer;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getNo() {return no;}public void setNo(String no) {this.no = no;}public Customer getCustomer() {return customer;}public void setCustomer(Customer customer) {this.customer = customer;}}

Customer.java

package www.hbsi.net.one2manyboth;import java.util.Set;public class Customer {private int id;private String name;private Set<Order> orders;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Set<Order> getOrders() {return orders;}public void setOrders(Set<Order> orders) {this.orders = orders;}}

新建持久化类配置文件

Order.hbm.xml

<?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 package="www.hbsi.net.one2manyboth">   <class name="Order" table="orders">      <id name="id" column="id">        <generator class="native"/>      </id>      <property name="no" column="no" type="string"/>      <many-to-one name="customer" column="customer_id" cascade="save-update"/>           </class></hibernate-mapping>

Customer.hbm.xml

<?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 package="www.hbsi.net.one2manyboth">   <class name="Customer" table="customer">      <id name="id" column="id">        <generator class="native"/>      </id>      <property name="name" column="name" type="string"/>          <set name="orders" inverse="true" cascade="save-update">          <key column="customer_id"/>          <one-to-many class="Order"/>     </set>      </class></hibernate-mapping>

更改hibernate配置文件

hibernate.cfg.xml

创建测试类

App.java

package www.hbsi.net.one2manyboth;import java.util.Set;import org.hibernate.Session;import org.junit.Test;import www.hbsi.net.util.HibernateSessionFactory;public class App {@Testpublic void add(){Session session = HibernateSessionFactory.getSession();session.beginTransaction();Customer customer = new Customer();customer.setName("客户2");Order order = new Order();order.setNo("1234");order.setCustomer(customer);Order order1 = new Order();order1.setNo("213");order1.setCustomer(customer);//order维护保存ordersession.save(order);session.save(order1);session.getTransaction().commit();HibernateSessionFactory.closeSession();}//查询1号客户的所有订单@Testpublic void find(){Session session = HibernateSessionFactory.getSession();session.beginTransaction();Customer cust = (Customer) session.get(Customer.class,1);Set<Order> orders = cust.getOrders();for(Order o:orders){System.out.println(o.getNo());}session.getTransaction().commit();HibernateSessionFactory.closeSession();}//改变订单的所有者      將4号订单给1号客户@Testpublic void change(){Session session = HibernateSessionFactory.getSession();session.beginTransaction();//查找4号订单Order o4 = (Order) session.get(Order.class,4);//查找1号客户Customer c1 = (Customer) session.get(Customer.class,1);//建立关联关系o4.setCustomer(c1);c1.getOrders().add(o4);session.getTransaction().commit();HibernateSessionFactory.closeSession();}}

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