1.数据模型
接口(Datamodule.java)
package com.company.demo.datamodule;
package com.company.demo.datamodule;
import net.sf.hibernate.Session;
import net.sf.hibernate.Transaction;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;
/**
* <p>Title: Struts+Hibernate开发模板</p>
* <p>Description: 通用开发模板</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Company: 优势科技</p>
* @author 段洪杰
* @version 1.0
*/
public interface DataModule {
public SessionFactory getSessionFactory();
}
数据模型 (DatamoduleImpl.java)
package com.company.demo.datamodule;
/**
* <p>Title: Struts+Hibernate开发模板</p>
* <p>Description: 通用开发模板</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Company: 优势科技</p>
* @author 段洪杰
* @version 1.0
*/
import net.sf.hibernate.Session;
import net.sf.hibernate.Transaction;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;
/**
* 建立 SessionFactory
*/
public class DataModuleImpl implements DataModule {
private SessionFactory sessionFactory;
public DataModuleImpl() throws HibernateException {
sessionFactory=new Configuration().configure().buildSessionFactory();
}
/**
* 从dataModule中取得 SessionFactory
*/
public SessionFactory getSessionFactory(){
return this.sessionFactory;
}
}
2.产生唯一ID的父类
接口 (SingletonIdDAO.java)
package com.company.demo.dao;
/**
* <p>Title: Struts+Hibernate开发模板</p>
* <p>Description: 通用开发模板</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Company: 优势科技</p>
* @author 段洪杰
* @version 1.0
*/
public interface SingletonIdDAO {
}
ID父类 (SingletonIdDAOImpl.java)
package com.company.demo.dao;
import java.util.List;
import com.company.demo.datamodule.*;
import com.company.demo.jdo.SingletonId;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.Transaction;
import net.sf.hibernate.Query;
/**
* 产生唯一的ID
*
* 数据库结构(ORACLE9i):
* 表名 SINGLETON_ID
* 字段 id(char) name varchar2(50) value number(10.0)
*
*
* <p>Title: Struts+Hibernate开发模板</p>
* <p>Description: 通用开发模板</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Company: 优势科技</p>
* @author 段洪杰
* @version 1.0
*
*
*/
public class SingletonIdDAOImpl implements SingletonIdDAO{
private SessionFactory sessionFactory;
private DataModule dataModule;
/**
* 设数据模型
*/
public void setDataModule(DataModule dataModule){
this.dataModule=dataModule;
this.sessionFactory=dataModule.getSessionFactory();
}
////////////////以下是业务逻辑////////////////////
private SingletonId findByName(String name) throws HibernateException,Exception {
Transaction transaction = null;
SingletonId singletonId=new SingletonId();
Session session=sessionFactory.openSession();
String queryString = "select g from SingletonId as g where g.name = :name order by g.value desc";
try{
transaction = session.beginTransaction();
Query query = session.createQuery(queryString);
query.setString("name",name);
// q.setFirstResult(20000);
//q.setMaxResults(100);
query.setMaxResults(1);
List list=query.list();
singletonId=(SingletonId)list.get(0);
transaction.commit();
}
catch(Exception ex){
if ( transaction!=null ){
transaction.rollback();
}
//throw ex;
}finally{
session.close();
}
return singletonId;
}
/** 取得value
* @param name 产唯一ID的类型名称
* @return value
* @throws HibernateException
*/
protected long getValue(String name) throws HibernateException,Exception {
SingletonId singletonId=findByName(name);
return singletonId.getValue();
}
/** 设置value
* @param name 产唯一ID的类型名称
* @throws HibernateException
*/
protected void setValue(String name) throws HibernateException,Exception {
Session session=sessionFactory.openSession();
SingletonId singletonId=findByName(name);
singletonId.setName(name);
singletonId.setValue(singletonId.getValue()+1);
Transaction transaction = null;
try{
transaction = session.beginTransaction();
session.saveOrUpdate(singletonId);
transaction.commit();
}catch(HibernateException he){
if ( transaction!=null ){
transaction.rollback();
}
throw he;
}finally{
session.close();
}
}
}
3.单例图片ID类(ImageSingletonId.java)
package com.company.demo.dao.count;
import net.sf.hibernate.HibernateException;
import com.company.demo.dao.SingletonIdDAOImpl;
import com.company.demo.datamodule.DataModule;
/**
* <p>Title: Struts+Hibernate开发模板</p>
* <p>Description: 通用开发模板</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Company: 优势科技</p>
* @author 段洪杰
* @version 1.0
*/
public class ImageSingletonId extends SingletonIdDAOImpl{
private static ImageSingletonId imageSingletonId = null;
/**
* 构造函数私有
*/
private ImageSingletonId(){
}
/**
* 静态工厂模式,取得ImageSingletonId实例
*/
public static synchronized ImageSingletonId getInstance() {
if (imageSingletonId==null)
{
imageSingletonId=new ImageSingletonId();
}
return imageSingletonId;
}
/**
* 取图形唯一ID
*/
public synchronized long getImageValue() throws HibernateException,Exception {
long value;
setValue("image");
value=getValue("image");
return value;
}
}
4.图片ID测试文件(TestImageSingletonId.jsp)
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="net.sf.hibernate.*" %>
<%@ page import="net.sf.hibernate.cfg.*" %>
<%@ page import="com.company.demo.datamodule.*" %>
<%@ page import="com.company.demo.dao.count.*" %>
<%!
DataModule dataModule;
ImageSingletonId imageSingletonId;
%>
<%
try{
imageSingletonId=ImageSingletonId.getInstance();
imageSingletonId.setDataModule(new DataModuleImpl());
}
catch(Exception ex)
{
ex.toString();
}
for(int i=0;i<100;i++){
out.print("测试..........<BR>");
out.print(imageSingletonId.getImageValue());
out.print("----------------<BR>");
}
%>
5.单例记数器ID类(MainPageSingletonId.java)
package com.company.demo.dao.count;
import net.sf.hibernate.HibernateException;
import com.company.demo.dao.SingletonIdDAOImpl;
import com.company.demo.datamodule.DataModule;
/**
* <p>Title: Struts+Hibernate开发模板</p>
* <p>Description: 通用开发模板</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Company: 优势科技</p>
* @author 段洪杰
* @version 1.0
*/
public class MainPageSingletonId extends SingletonIdDAOImpl{
private static MainPageSingletonId mainPageSingletonId = null;
/**
* 构造函数私有
*/
private MainPageSingletonId(){
}
/**
* 静态工厂模式,取得MainPageSingletonId实例
*/
public static synchronized MainPageSingletonId getInstance() {
if (mainPageSingletonId==null)
{
mainPageSingletonId=new MainPageSingletonId();
}
return mainPageSingletonId;
}
/**
* 取唯一ID
*/
public synchronized long getMainPageValue() throws HibernateException,Exception {
long value;
setValue("mainPage");
value=getValue("mainPage");
return value;
}
}
6.记数ID测试文件(TestMainPageSingletonId.jsp)
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="net.sf.hibernate.*" %>
<%@ page import="net.sf.hibernate.cfg.*" %>
<%@ page import="com.company.demo.datamodule.*" %>
<%@ page import="com.company.demo.dao.count.MainPageSingletonId" %>
<%!
DataModule dataModule;
MainPageSingletonId mainPageSingletonId;
%>
<%
try{
mainPageSingletonId=MainPageSingletonId.getInstance();
mainPageSingletonId.setDataModule(new DataModuleImpl());
}
catch(Exception ex)
{
ex.toString();
}
for(int i=0;i<100;i++){
out.print("测试..........<BR>");
out.print(mainPageSingletonId.getMainPageValue());
out.print("----------------<BR>");
}
%>
7.综合单例测试(略)