hibernate通过session实现增删改查操作实例解析

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(); 
  }