遨游Hibernate之二

 说明一下,本例子源码选自<<Hibernate 开发及整合应用大全>>,略有改动.

这节要讲的是如何用Hibernate实现增删修查四个功能,本例在第一节的基础上加上一个DAOImp.java

源码如下:

/** *//**
 * @author tiger Create Date 2006-11-25
 *
 * Blog: tiger.ptuhaiwai.com
 */
package persistence;
import java.util.List;
import model.Student;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.SessionFactory;

public class DAOImp ...{
    
    static Session session = null;
    static SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
    /**//*--------------创建新的学生对象--------------*/
    public static void createStu(Student stu)...{
        try ...{
            session = sessionFactory.openSession();
            Transaction tx = session.beginTransaction();
            session.save(stu);
            tx.commit();
        } catch (HibernateException e) ...{
            // TODO: handle exception
            e.printStackTrace();
        }finally
        ...{
            session.close();
        }
        
    }
    
    /**//*--------------删除学生对象---------------*/
    public static void delStu(String id)...{
        try ...{
            session = sessionFactory.openSession();
            Transaction tx = session.beginTransaction();
            Student stu =(Student)session.get(Student.class, id);
            session.delete(stu);
            tx.commit();
        } catch (HibernateException e) ...{
            // TODO: handle exception
            e.printStackTrace();
        }finally...{
            session.close();
        }
    }
    
    /**//*------------------修改学生对象----------------------*/
    public static void mdfStu(Student stu)...{
        try ...{
            session = sessionFactory.openSession();
            Transaction tx = session.beginTransaction();
            session.update(stu);
            tx.commit();
        } catch (HibernateException e) ...{
            // TODO: handle exception
            e.printStackTrace();
        }finally...{
            session.close();
        }
    }
    
    /**//*-------------------取得所有的学生列表------------------------*/
    public static List getAllStu()...{
        List list = null;
        try ...{
            session = sessionFactory.openSession();
            Transaction tx = session.beginTransaction();
            Query q = session.createQuery("from Student");
            list = q.list();
            tx.commit();
            
        } catch (HibernateException e) ...{
            // TODO: handle exception
            e.printStackTrace();
        }finally...{
            session.close();
        }
        return list;
    }

}

之后给出测试样例:

 

/** *//**
 * @author tiger Create Date 2006-11-25
 *
 * Blog: tiger.ptuhaiwai.com
 */
package BusinessManager;

import java.util.List;

import model.Student;

import persistence.DAOImp;

public class Test ...{
    
    public static void main(String[] args) ...{
        /**//*------创建新的学生对象------*/
        //Student stu = new Student();
        //stu.setName("tiger");
        //stu.setPwd("123456");
        //stu.setEmail("[e-mail]");
        //stu.setAge(24);
        //DAOImp.createStu(stu);
        /*--------修改学生对象--------*/
        //List list = DAOImp.getAllStu();
           // Student u = (Student)list.get(0);
           // u.setAge(88);
        // u.set???任意
          // DAOImp.mdfStu(u);
        /**//*--------删除学生对象-------*/
          List list = DAOImp.getAllStu();
          Student u = (Student)list.get(0);
          DAOImp.delStu(u.getId());
    }

}

 本节结束.

第三节要讲的如何用四个功能做一个分页查询功能