package test.com.lesson5;import javax.print.attribute.standard.Finishings;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.AnnotationConfiguration;import com.lesson5.User;import junit.framework.TestCase;public class TestUser extends TestCase {        public void testCreate(){        SessionFactory sessionFactory = new AnnotationConfiguration().configure("com/lesson5/lesson5.cfg.xml").buildSessionFactory();        Session session = sessionFactory.openSession();        Transaction tx = session.beginTransaction();                try {            //瞬时态            User user = new User();            user.setName("test");            //执行insert            session.save(user);                        tx.commit();        } catch (Exception e) {            tx.rollback();                        e.printStackTrace();        }finally{            session.close();        }    }        public void testGet(){        SessionFactory sessionFactory = new AnnotationConfiguration().configure("com/lesson5/lesson5.cfg.xml").buildSessionFactory();                Session session = sessionFactory.openSession();        Transaction tx = session.beginTransaction();                try {            //从数据 库读出的user是持久态            //get方法先查一级缓存，再查二级缓存，最后再查数据 库            User user = (User) session.get(User.class,0);            System.out.println("name=" + user.getName());                        //从缓存中获取            User user2 = (User) session.get(User.class,0);            System.out.println("name=" + user2.getName());                        tx.commit();        } catch (Exception e) {            tx.rollback();                        e.printStackTrace();        }finally{            session.close();        }    }        public void testLoad(){        SessionFactory sessionFactory = new AnnotationConfiguration().configure("com/lesson5/lesson5.cfg.xml").buildSessionFactory();                Session session = sessionFactory.openSession();        Transaction tx = session.beginTransaction();                try {            //load先查一级缓存，没有创建代理对象，访问对象属性时才进行实际查询            //load方法如果没有找到记录则抛出            //org.hibernate.ObjectNotFoundException: No row with the given identifier exists            User user = (User) session.load(User.class,1);            System.out.println("name=" + user.getName());                        tx.commit();        } catch (Exception e) {            tx.rollback();                        e.printStackTrace();        }finally{            session.close();        }    }        public void testDelete(){        SessionFactory sessionFactory = new AnnotationConfiguration().configure("com/lesson5/lesson5.cfg.xml").buildSessionFactory();                Session session = sessionFactory.openSession();        Transaction tx = session.beginTransaction();                try {            User user = (User) session.get(User.class,0);            System.out.println("name=" + user.getName());                        session.delete(user);            tx.commit();        } catch (Exception e) {            tx.rollback();                        e.printStackTrace();        }finally{            session.close();        }    }        public void testSaveOrUpdate(){        SessionFactory sessionFactory = new AnnotationConfiguration().configure("com/lesson5/lesson5.cfg.xml").buildSessionFactory();        Session session = sessionFactory.openSession();        Transaction tx = session.beginTransaction();                try {            //瞬时态            User user = new User();            user.setId(123);            user.setName("test123");            //merge方法执行后，user不会纳入session管理，与saveOrUpdate相反            session.saveOrUpdate(user);                        User user2 = (User) session.get(User.class,123);            System.out.println("hashcode=" + user.hashCode());            System.out.println("hashcode=" + user2.hashCode());            //hashcode 一样                        tx.commit();        } catch (Exception e) {            tx.rollback();                        e.printStackTrace();        }finally{            session.close();        }    }        public void testMerge(){        SessionFactory sessionFactory = new AnnotationConfiguration().configure("com/lesson5/lesson5.cfg.xml").buildSessionFactory();        Session session = sessionFactory.openSession();        Transaction tx = session.beginTransaction();                try {            //瞬时态            User user = new User();            user.setId(123);            user.setName("test123");            //merge方法执行后，user不会纳入session管理，与saveOrUpdate相反            session.merge(user);                        User user2 = (User) session.get(User.class,123);            System.out.println("hashcode=" + user.hashCode());            System.out.println("hashcode=" + user2.hashCode());            //hashcode 不一样                        tx.commit();        } catch (Exception e) {            tx.rollback();                        e.printStackTrace();        }finally{            session.close();        }    }}

package com.lesson5;import javax.persistence.Entity;import javax.persistence.Id;@Entitypublic class User {    private int id;    private String name;        @Id    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }        }

     
         
              
       
        org.hibernate.dialect.MySQLDialect
               
       
        jdbc:mysql://127.0.0.2:3306/test
               
       
        root
               
       
        root
               
       
        com.mysql.jdbc.Driver
               
       
        true
               
       
        true
               
       
        update