使用eclipse編寫hibernate程序 (alluser的專欄)

1、  在mysql中創建數據庫test，創建表t_user  (id[自動增長],name,sex)

2、  在eclipse中配置database explore

3、  打開database explore，建立連接

4、  創建java工程（注意將hibernate、Junit、mysql jdbc驅動程序都添加上，如下圖）

5、  爲工程添加hibernate支持

注意這裏如果選中add hibernate2.1 libraries to project? 則前面創建工程時可以不添加hibernate類庫

6、  回到database explore，創建hibernate映射

7、  查看工程

在hibernate.cfg.xml文件中加入

       <property name="hibernate.show_sql">True</property>

       <property name="hibernate.transaction.factory_class">

           net.sf.hibernate.transaction.JDBCTransactionFactory

       </property>

8、  建立測試文件HibernateTest.java

package com.tc.test;

 

 

import java.util.List;

 

 

import net.sf.hibernate.HibernateException;

import net.sf.hibernate.Session;

import net.sf.hibernate.SessionFactory;

import net.sf.hibernate.cfg.Configuration;

import junit.framework.Assert;

import junit.framework.TestCase;

 

 

public class HibernateTest extends TestCase {

       Session session = null;

       protected void setUp() {

              try {

                     session=HibernateSessionFactory.currentSession();

              } catch (HibernateException e) {

                     e.printStackTrace();

              }

       }

       protected void tearDown() {

              try {

                     session.close();

              } catch (HibernateException e) {

                     e.printStackTrace();

              }

       }

       public void testInsert() {

              try {

                     TUser user = new TUser();

                     user.setName("Emma2");

                     user.setSex(new Integer(0));

                     session.save(user);

                     session.flush();

              } catch (HibernateException e) {

                     e.printStackTrace();

                     Assert.fail(e.getMessage());

              }

       }

 

 

       public void testSelect() {

              String hql = " from TUser where name='Emma'";

              try {

                     List userList = session.find(hql);

                     TUser user = (TUser) userList.get(0);

                     Assert.assertEquals(user.getName(), "Emma");

              } catch (HibernateException e) {

                     e.printStackTrace();

                     Assert.fail(e.getMessage());

              }

       }

}

9、  運行測試

10.數據檢索Criteria Query

具體的Criteria 查詢表達式語法請參考hibernate手冊或夏昕寫的hibernate開發指南，這裏描述的是： Criteria 高級特性 限定返回的記錄範圍

       package com.tc;

 

 

import java.util.Iterator;

import java.util.List;

 

 

import net.sf.hibernate.Criteria;

import net.sf.hibernate.HibernateException;

import net.sf.hibernate.Session;

import net.sf.hibernate.expression.Order;

 

 

public class TestCriteria {

 

 

       /**

        * @param args

        * @throws HibernateException

        */

       public static void main(String[] args) throws HibernateException {

              // TODO Auto-generated method stub

              Session session = null;

              session=HibernateSessionFactory.currentSession();

              Criteria criteria = session.createCriteria(TUser.class);

//            從5條結果開始的5條記錄

              criteria.setFirstResult(5);

              criteria.setMaxResults(5);

              criteria.addOrder(Order.asc("id"));

              List list=criteria.list();

              System.out.println(list.size());

              for (Iterator iter = list.iterator(); iter.hasNext();) {

                     TUser element = (TUser) iter.next();

                     System.out.println(element.getName());

              }

       }

}

 

 

11、  數據檢索HQL

相對Criteria，HQL提供了更接近傳統SQL語句的查詢語法。

package com.tc.test;

 

 

import java.util.List;

 

 

import net.sf.hibernate.HibernateException;

import net.sf.hibernate.Query;

import net.sf.hibernate.Session;

 

 

public class TestHQL {

public static void main(String[] args) throws HibernateException {

        Session session = null;

        session=HibernateSessionFactory.currentSession();

        //String hql = "from com.tc.test.TUser";

        String hql =

               "from com.tc.test.TUser as user where user.name='kk'";

        Query query = session.createQuery(hql);

        List userList = query.list();

        System.out.println(userList.size());

}

}