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