hibernate篇章六--demo（Hibernate之第1解之-hibernate_demo_1）

准备工作做好了，开始Hibernate：

1：建立包：package：dao、model、service、util包；

2：开始model实体类Student：id，sname生成getter/setter；

Java代码

     package model;  

     public class Student {
         private int id;
         private String name;  

         public int getId() {
             return id;
         }
         private void setId(int id) {
             this.id = id;
         }
         public String getName() {
             return name;
         }
         public void setName(String name) {
             this.name = name;
         }
     }  

3：在Hibernate源码下/project/搜索 *.xml复制以下文件：

hibernate.cfg.xml-->src下；

*.hbm.xml-->model下；

4：配置hibernate.cfg.xml

     <session-factory>
             <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
             <property name="connection.url">jdbc:mysql://localhost:3306/hibnie</property>
             <property name="connection.username">root</property>
             <property name="connection.password">1234</property>
             <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
             <property name="show_sql">true</property>  

             <mapping resource="model/Student.hbm.xml"/>
         </session-factory>  

5：配置Student.hbm.xml

     <hibernate-mapping package="model">
         <class name="Student" table="s" lazy="false">
             <id name="id" type="integer" column="sid">
                 <generator class="identity"/>
             </id>
             <property name="name" type="string" column="sname" />
         </class>
     </hibernate-mapping>  

6：加入JUnit4 jar包，加入path；

7：写util.HibernateUtil

     package util;  

     import org.hibernate.Session;
     import org.hibernate.SessionFactory;
     import org.hibernate.cfg.Configuration;  

     public class HibernateUtil {
         private static final SessionFactory sessionFactory=buildSessionFactory();  

         /** init sessionFactory */
         private static SessionFactory buildSessionFactory() {
             SessionFactory sessionFactory=null;
             try{
                 sessionFactory=new Configuration().configure().buildSessionFactory();
             }catch(Throwable te){
                 System.err.println("init sessionFactory Error:"+te);
                 te.printStackTrace();
             }
             return sessionFactory;
         }   

         /** get session */
         public static Session getSession(){
             Session stion=sessionFactory.openSession();
             return stion;
         }  

     }  

8：测试HIbernateUtil

            @Test
     public void testGetSession() {
         Session stion=HibernateUtil.getSession();
         System.out.println(stion);
     }  

9：dao层-->StudentDao

     package dao;  

     import java.util.Iterator;
     import org.hibernate.Criteria;
     import org.hibernate.HibernateException;
     import org.hibernate.Query;
     import org.hibernate.SQLQuery;
     import org.hibernate.Session;
     import org.hibernate.Transaction;
     import org.hibernate.criterion.Restrictions;
     import util.HibernateUtil;
     import model.Student;  

     public class StudentDao {
         /** insert;  */
         public void addStudent(Student stu){
             Session session=HibernateUtil.getSession();
             Transaction tx=null;
             try{
                 tx=session.beginTransaction();
                 session.save(stu);
                 tx.commit();
             }catch(HibernateException he){
                 tx.rollback();
                 he.printStackTrace();
             }finally{
                 session.close();
             }
         }
         /** select;  */
         public Student getStudent(int sid){
             Session session=HibernateUtil.getSession();
             Transaction tx=null;
             Student stu=null;
             try{
                 tx=session.beginTransaction();
                 stu=(Student)session.load(Student.class,new Integer(sid));
     //          stu=(Student)session.get(Student.class,new Integer(sid));
                 tx.commit();
             }catch(HibernateException he){
                 tx.rollback();
                 he.printStackTrace();
             }finally{
                 session.close();
             }
             return stu;
         }
         /** update   */
         public void updateStudent(String oldName,String newName){
             Session session=HibernateUtil.getSession();
             Transaction tx=null;
             try{
                 tx=session.beginTransaction();
                 Query q=session.createQuery("from Student s where s.name= ?");
                 q.setParameter(0, oldName);
                 Iterator<Student> it=q.list().iterator();
                 while(it.hasNext()){
                     Student s=it.next();
                     s.setName(newName);
                     session.update(s);
                 }
                 tx.commit();
                 session.close();
             }catch(HibernateException he){
                 tx.rollback();
                 he.printStackTrace();
             }
         }
         /** delete   */
         public void deleteStudent(String str){
             Session session=HibernateUtil.getSession();
             Transaction tx=null;
             try {
                 tx=session.beginTransaction();
                 /*  1.Criteria查询；   */
                 Criteria criter=session.createCriteria(Student.class).add(Restrictions.like("name","%"+str+"%"));
                 Iterator<Student> it=criter.list().iterator();
                 /*  2.Query查询
                 Query q=session.createQuery("from Student as s where s.name like ?");
                 q.setParameter(0, "%"+str+"%");
                 Iterator<Student> it=q.list().iterator(); */
                 /*  3.Native sql查询  表名和表中的列名而不是实体类的类名和属性名了
                 SQLQuery sqlq=session.createSQLQuery("SELECT * FROM s WHERE sname like ?").addEntity(Student.class);
                 sqlq.setParameter(0, "%"+str+"%");
                 Iterator<Student> it=sqlq.list().iterator();  */
                 while(it.hasNext()){
                     session.delete(it.next());
                 }
                 tx.commit();
             } catch (HibernateException he) {
                 tx.rollback();
                 he.printStackTrace();
             } finally {
                 session.close();
             }
         }
     }  

10.业务层-->service：StudentManager：

     package service;  

     import dao.StudentDao;
     import model.Student;  

     public class StudentManager {
         StudentDao dao=new StudentDao();
         public void save(Student stu){
             dao.addStudent(stu);
         }
         public Student get(int id){
             return dao.getStudent(id);
         }
         public void update(String oname,String nname){
             dao.updateStudent(oname, nname);
         }
         public void delete(String name){
             dao.deleteStudent(name);
         }
     }  

11.测试业务逻辑：StudentManagerTest

     package service;  

     import model.Student;
     import org.junit.Before;
     import org.junit.Test;  

     public class StudentManagerTest {
         StudentManager manager;
         @Before
         public void init(){
             manager=new StudentManager();
         }
         @Test public void testSave() {
             Student stu1=new Student();
             stu1.setName("John woo");
             manager.save(stu1);
         }
         @Test public void testGet(){
             Student stu=manager.get(12);
             System.out.println(stu.getName());
         }
         @Test public void testUpdate(){
             manager.update("Mary","Nie");
         }
         @Test public void testDelete(){
             manager.delete("ie");
         }
     }  

个基本hibernate就完成了，包括基本的CRUD还有3种查询方式。

备注：lib下的jar包：

     antlr-2.7.6.jar
     commons-collections-3.1.jar
     dom4j-1.6.1.jar
     hibernate3.jar
     hibernate-jpa-2.0-api-1.0.0.Final.jar
     javassist-3.12.0.GA.jar
     jta-1.1.jar
     junit-4.9b1.jar
     mysql6.jar
     slf4j-api-1.6.1.jar
     slf4j-simple-1.6.1.jar  

注意：

1.原作者：学不可以已

2.我做完之后发现一个问题；就是update不成功，不知道是什么原因

3.junit是进行单元测试用到的，可以去我的微博搜素相关资料，输入关键字“junit”，输入下图中的“查询框中”

4：附带我的代码，跟这文章的上一篇章0中分享的我自己修改的代码是一样的。链接：http://pan.baidu.com/s/1nt65KgD 密码：6uac