package com.hibernate.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity 
@Table(name = "_Teacher") 
public class Teacher {
 private int id;
 private String name;
 private int age;
 private String birthPlace;
 @Id 
 @GeneratedValue 
 @Column(name = "_id") 
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 @Column(name = "_name") 
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 @Column(name = "_age") 
 public int getAge() {
  return age;
 }
 public void setAge(int age) {
  this.age = age;
 }
 @Column(name = "_birthPlace") 
 public String getBirthPlace() {
  return birthPlace;
 }
 public void setBirthPlace(String birthPlace) {
  this.birthPlace = birthPlace;
 }
}

package com.hibernate.model;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
public class TeacherTest {
 public static SessionFactory sf = null;
 @BeforeClass 
   public static void beforeClass(){
  try{
   sf = new AnnotationConfiguration().configure().buildSessionFactory();
   //此处最好要获取一下异常，因为annotation有一个bug有时出现有时不出现
  }
  catch(Exception e){
   e.printStackTrace();
  }
  finally{
  }
 }
 @Test 
   public void testSave() {
  //增 
  Teacher t = new Teacher();
  t.setAge(23);
  t.setName("moluo");
  t.setBirthPlace("huangshan");
  Session session = sf.getCurrentSession();
  session.beginTransaction();
  session.save(t);
  session.getTransaction().commit();
 }
 @AfterClass 
   public static void afterClass(){
  sf.close();
 }
}

@Test 
  public void testDelete() {
 //删 
 Teacher t = new Teacher();
 t.setId(2);
 Session session = sf.getCurrentSession();
 session.beginTransaction();
 session.delete(t);
 session.getTransaction().commit();
}

@Test 
  public void testGet() {//get     
    Session session = sf.getCurrentSession(); 
    session.beginTransaction(); 
    Teacher t = (Teacher)session.get(Teacher.class, 1); 
    System.out.println("姓名为："+t.getName()); 
    session.getTransaction().commit(); 
  } 

Hibernate: select teacher0_._id as column1_1_0_, teacher0_._age as column2_1_0_, teacher0_._birthPlace as column3_1_0_, teacher0_._name as column4_1_0_ from _Teacher teacher0_ where teacher0_._id=? 
姓名为：moluo 

@Test 
  public void testLoad() {//load  
    Session session = sf.getCurrentSession(); 
    session.beginTransaction(); 
    Teacher t = (Teacher)session.load(Teacher.class, 1); 
    System.out.println("姓名为："+t.getName()); 
    session.getTransaction().commit(); 
  } 

Hibernate: select teacher0_._id as column1_1_0_, teacher0_._age as column2_1_0_, teacher0_._birthPlace as column3_1_0_, teacher0_._name as column4_1_0_ from _Teacher teacher0_ where teacher0_._id=? 
姓名为：moluo 

@Test 
  public void testUpdate() {//更新  
    Session session = sf.getCurrentSession(); 
    session.beginTransaction(); 
    String url = "update Teacher t set t.birthPlace = 'anhui' where id = 1"; 
    //注意这里的Teacher必须是对象名字，而不是表名，t是对象的别名 
    Query q = session.createQuery(url); 
    //这里导入的包是：import org.hibernate.Query; 
    q.executeUpdate(); 
    session.getTransaction().commit(); 
  }