最后建立類
BusinessService.java
放置
src/com
package com;
?
?
?
//import net.sf.hibernate.*;
import net.sf.hibernate.*;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;
import java.util.*;
//import net.sf.hibernate.cfg.Configuration;
import java.util.*;
?
?
?
public class BusinessService{
? public static SessionFactory sessionFactory;
? static{
???? try{
????? // Create a configuration based on the properties file we've put
?????? Configuration config = new Configuration();
?????? config.addClass(Customer.class)
???????????? .addClass(Order.class);
????? // Get the session factory we can use for persistence
????? sessionFactory = config.buildSessionFactory();
??? }catch(Exception e){e.printStackTrace();}
? }
?
? public List findOrdersByCustomer(Customer customer) throws Exception{
??? Session session = sessionFactory.openSession();
??? Transaction tx = null;
??? try {
????? tx = session.beginTransaction();
?
????? List orders=(List)session.find("from Order as o where o.customer.id="+customer.getId());
????? tx.commit();
????? return orders;
??? }catch (Exception e) {
????? if (tx != null) {
??????? tx.rollback();
????? }
????? throw e;
??? } finally {
????? session.close();
??? }
? }
?
? public Customer findCustomer(long customer_id) throws Exception{
??? Session session = sessionFactory.openSession();
??? Transaction tx = null;
??? try {
????? tx = session.beginTransaction();
????? Customer customer=(Customer)session.load(Customer.class,new Long(customer_id));
????? tx.commit();
????? return customer;
??? }catch (Exception e) {
????? if (tx != null) {
??????? // Something went wrong; discard all partial changes
??????? tx.rollback();
????? }
????? throw e;
??? } finally {
????? // No matter what, close the session
????? session.close();
??
?}
? }
?
? public void saveCustomerAndOrderWithCascade() throws Exception{
??? Session session = sessionFactory.openSession();
??? Transaction tx = null;
??? try {
????? tx = session.beginTransaction();
?
????? Customer customer=new Customer("Jack");
????? Order order1=new Order("Jack_Order001",customer);
????? Order order2=new Order("Jack_Order002",customer);
?
????? session.save(order1);
????? session.save(order2);
?
????? tx.commit();
?
??? }catch (Exception e) {
????? if (tx != null) {
??????? tx.rollback();
????? }
????? e.printStackTrace();
??? } finally {
????? // No matter what, close the session
????? session.close();
??? }
? }
?
? public void saveCustomerAndOrder() throws Exception{
?
???
??// Ask for a session using the JDBC information we've configured
?
??????
?
? Session session = sessionFactory.openSession();
??????
?? Transaction tx = null;
??????
?? try {
????? tx = session.beginTransaction();
?????
?
?????? Customer customer=new Customer("Tom");
??????
?? session.save(customer);
??????
?
??? Order order1=new Order("Tom_Order001",customer);
???? Order order2=new Order("Tom_Order002",customer);
??? session.save(order1);
???? session.save(order2);
????? // We're done; make our changes permanent
????? tx.commit();
??????
?? /*?????
*/
??? }catch (Exception e) {
???? if (tx != null) {
??????? // Something went wrong; discard all partial changes
???? tx.rollback();
????? }
????? throw e;
??
??? } finally {
? // No matter what, close the session
????? session.close();
?
??? }
???
?
? }
?
? public void printOrders(List orders){
????? for (Iterator it = orders.iterator(); it.hasNext();) {
???????? Order order=(Order)it.next();
???????? System.out.println("OrderNumber of "+order.getCustomer().getName()+ " :"+order.getOrderNumber());
????? }
? }
?
?? public void test() throws Exception{
????? //saveCustomerAndOrder();
???? // saveCustomerAndOrderWithCascade();
????? Customer customer=findCustomer(1);
????? List orders=findOrdersByCustomer(customer);
???? printOrders(orders);
? }
?
? public static void main(String args[]) throws Exception {
??? new BusinessService().test();
??? sessionFactory.close();
? }
}
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BusinessService.java
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