Hibernate【2】——封装工具、HibernateUtil类以及DAO层的BaseDAO类-白红宇

1、整体目录

（1）添加一个HibernateUtil类（获取会话）

（2）添加一个BaseDAO类（基本操作）

（3）添加一个测试类

2、HibernateUtil

1 package com.demo.util; 2  3 import org.hibernate.Session; 4 import org.hibernate.SessionFactory; 5 import org.hibernate.cfg.Configuration; 6 import org.hibernate.service.ServiceRegistry; 7 import org.hibernate.service.ServiceRegistryBuilder; 8  9 public class HibernateUtil {10       private static SessionFactory sessionFactory;11       12       /**13       * @return 获取会话工厂14       */15        public static SessionFactory getSessionFactory()16        {17          //第一步:读取Hibernate的配置文件  hibernamte.cfg.xml文件18          Configuration con=new Configuration().configure();19          //第二步:创建服务注册构建器对象，通过配置对象中加载所有的配置信息20          ServiceRegistryBuilder regbulider=new ServiceRegistryBuilder().applySettings(con.getProperties());21          //创建注册服务22          ServiceRegistry reg=regbulider.buildServiceRegistry();23          //第三步:创建会话工厂24          SessionFactory sessionFactory=con.buildSessionFactory(reg);25          return sessionFactory;26        }27        28       /**29       * @return 获取会话对象30       */31        public static Session getSession()32        {33           return getSessionFactory().openSession();34        }35 }

3、BaseDAO类

1 package com.demo.dao;  2   3 import java.util.ArrayList;  4 import java.util.List;  5   6 import org.hibernate.Query;  7 import org.hibernate.Session;  8 import org.hibernate.Transaction;  9  10 import com.demo.util.HibernateUtil; 11  12 public class BaseDAO { 13       /** 14      * @param obj 添加数据 15      * @return 16      */ 17       public static boolean add(Object obj) 18       { 19         Session session=null; 20         Transaction tran=null; 21         boolean result=false; 22         try 23         { 24             session=HibernateUtil.getSession(); 25             tran=session.beginTransaction(); 26             session.save(obj); 27             tran.commit(); 28             result=true; 29         } 30         catch (Exception e) 31         { 32            if(tran!=null) 33            { 34                //事物回滚 35                tran.rollback(); 36            } 37         } 38         finally 39         { 40             if(session!=null) 41             { 42                 //关闭session 43                 session.close(); 44             } 45         } 46         return result; 47       } 48        49       /** 50      * @return 更新数据  51      * 参数为修改的主键id对象 52      */ 53     public static boolean update(Object object) 54       { 55             Session session=null; 56             Transaction tran=null; 57             boolean result=false; 58             try 59             { 60                 session=HibernateUtil.getSession(); 61                 tran=session.beginTransaction(); 62                 session.update(object); 63                 tran.commit(); 64                 result=true; 65             } 66             catch (Exception e) 67             { 68                if(tran!=null) 69                { 70                    //事物回滚 71                    tran.rollback(); 72                } 73             } 74             finally 75             { 76                 if(session!=null) 77                 { 78                     //关闭session 79                     session.close(); 80                 } 81             } 82             return result; 83           } 84           85       /** 86      * @param c 87      * @param id  查询一条数据根据主键的id号 88      * @return 89      */ 90       public static Object get(Class c,int id) 91       { 92             Session session=null; 93             Object object=null; 94             try 95             { 96                 session=HibernateUtil.getSession(); 97                 object=session.get(c,id); 98             } 99             catch (Exception e)100             {101             }102             finally103             {104                 if(session!=null)105                 {106                     //关闭session107                     session.close();108                 }109             }110             return object;111       }112 113       /**114      * @param obj115      * @return 删除数据116      */117     public static boolean delete(Object obj)118       {119             Session session=null;120             Transaction tran=null;121             boolean result=false;122             try123             {124                 session=HibernateUtil.getSession();125                 tran=session.beginTransaction();126                 session.delete(obj);127                 tran.commit();128                 result=true;129             }130             catch (Exception e)131             {132                if(tran!=null)133                {134                    //事物回滚135                    tran.rollback();136                }137             }138             finally139             {140                 if(session!=null)141                 {142                     //关闭session143                     session.close();144                 }145             }146             return result;147       }148 149 150       /**151      * @param 
     
       查询多条记录152      * @param sql  sql语句153      * @param param 参数数组154      * @return155      */156      @SuppressWarnings("unchecked")157     public static 
      
        List
       
         query(String sql,String[] param)158       {159 160           List
        
          list=new ArrayList
         
          ();161           Session session=null;162            try163             {164                 session=HibernateUtil.getSession();165                 Query query=session.createQuery(sql);166                 if(param!=null)167                 {168                     for(int i=0;i
          
           223 * @param sql224 * @param param225 * @param page226 * @param size227 * @return 实现分页查询228 */229 @SuppressWarnings("unchecked")230 public static 
           
             List
            
              queryByPage(String sql,String[] param,int page,int size)231 {232 List
             
               list=new ArrayList
              
               ();233 Session session=null;234 try235 {236 session=HibernateUtil.getSession();237 Query query=session.createQuery(sql);238 if(param!=null)239 {240 for(int i=0;i

4、TestHibernateUtil类

1 package com.demo.test; 2  3 import java.util.Iterator; 4 import java.util.List; 5  6 import com.demo.dao.BaseDAO; 7 import com.demo.model.User; 8  9 public class TestHibernateUtil {10     public static void main(String[] args) {11         12         BaseDAO userDao = new BaseDAO();13         //add14         User user1 = new User();15         user1.setUserName("asdf");16         user1.setUserPwd("1234");17         userDao.add(user1);18         System.out.println("添加了一条数据：asdf-->1234");19         //get20         User user2 = (User)userDao.get(User.class, 6);21         System.out.println("用户ID为6的用户数据："+user2.getUserName()+"-->"+user2.getUserPwd());22         //update23         user2.setUserName("test");24         user2.setUserPwd("789");25         userDao.update(user2);26         System.out.println("用户ID为6的用户数据："+user2.getUserName()+"-->"+user2.getUserPwd());27         //query all28         String[] para ={"3"};29         List
     
       list = userDao.query("from User u where u.id=?", para);30         Iterator iter = list.iterator();31         User user3 = null;32         while(iter.hasNext()){33             user3 = (User)iter.next();34             System.out.println(user3.getUserName()+"-->"+user3.getUserPwd());35         }36         37         38         //del by id39 /*        User user4 = new User();40         user4.setId(5);41         userDao.delete(user4);42         System.out.println("删除了ID为5的用户！");43 */    }44 }

本文转自ZH奶酪博客园博客，原文链接：http://www.cnblogs.com/CheeseZH/archive/2013/03/01/2938189.html，如需转载请自行联系原作者