（二）Hibernate4 CRUD 体验

所有的学习我们必须先搭建好hibernate的环境（1、导入对应的jar包，2、hibernate.cfg.xml，3、XXXX.hbm.xml）

第一节：HibernateUtil 封装

导入对应的hibernate的jar包和mysql的jar包

HibernateUtil.java

 package com.wishwzp.util;
 
 import org.hibernate.SessionFactory;
 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
 import org.hibernate.cfg.Configuration;
 import org.hibernate.service.ServiceRegistry;
 
 /**
  *
  * hibernate封装
  * @author wishwzp
  *
  */
 public class HibernateUtil {
 
     private static final SessionFactory sessionFactory=buildSessionFactory();
 
     /**
      * 绑定SessionFactory
      * @return
      */
     private static SessionFactory buildSessionFactory(){
         // 实例化配置文件
         Configuration configuration=new Configuration().configure();
         // 实例化服务登记
         ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
         //获取Session工厂
         return configuration.buildSessionFactory(serviceRegistry);
     }
 
     public static SessionFactory getSessionFactory(){
         return sessionFactory;
     }
 } 

第二节：XML 版CRUD 实现

导入对应的hibernate的jar包、mysql的jar包和添加每次都需要用到的HibernateUtil.java

Student.java

 package com.wishwzp.model;
 
 public class Student {
 
     private long id;
     private String name;
 
     public long getId() {
         return id;
     }
     public void setId(long id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     @Override
     public String toString() {
         return "Student [id=" + id + ", name=" + name + "]";
     }
 
 }

Student.hbm.xml

 <?xml version="1.0"?>
 <!DOCTYPE hibernate-mapping PUBLIC
         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 
 <hibernate-mapping package="com.wishwzp.model">
 
     <class name="Student" table="t_student">
         <id name="id" column="stuId">
             <generator class="native"></generator>
         </id>
 
         <property name="name"></property>
     </class>
 
 </hibernate-mapping>

hibernate.cfg.xml

 <?xml version='1.0' encoding='utf-8'?>
 <!DOCTYPE hibernate-configuration PUBLIC
         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 
 <hibernate-configuration>
 
     <session-factory>
 
         <!--数据库连接设置 -->
         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
         <property name="connection.username">root</property>
         <property name="connection.password">123456</property>
 
         <!-- 方言 -->
         <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
 
         <!-- 控制台显示SQL -->
         <property name="show_sql">true</property>
 
         <!-- 自动更新表结构 -->
         <property name="hbm2ddl.auto">update</property>
 
         <!-- XML 版CRUD 实现 -->
           <mapping resource="com/wishwzp/model/Student.hbm.xml"/>
 
 </hibernate-configuration>

StudentTest.java

 package com.wishwzp.service;
 
 import java.util.List;
 
 import org.hibernate.Query;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 
 import com.wishwzp.model.Student;
 import com.wishwzp.util.HibernateUtil;
 
 public class StudentTest {
 
     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
 
     /**
      * 添加
      */
     private void add(){
         // 生成一个session
         Session session=sessionFactory.openSession();
         // 开启事务
         session.beginTransaction(); 
 
         Student s=new Student();
         s.setName("张三");
         session.save(s);
 
         // 提交事务
         session.getTransaction().commit();
         // 关闭session
         session.close();
     }
 
     /**
      * 删除
      */
     private void delete(){
         // 生成一个session
         Session session=sessionFactory.openSession();
         // 开启事务
         session.beginTransaction(); 
 
         Student student=(Student)session.get(Student.class, Long.valueOf(1));
         session.delete(student);
 
         // 提交事务
         session.getTransaction().commit();
         // 关闭session
         session.close();
     }
 
     /**
      * 更新
      */
     private void update(){
         // 生成一个session
         Session session=sessionFactory.openSession();
         // 开启事务
         session.beginTransaction(); 
 
         Student student=(Student)session.get(Student.class, Long.valueOf(2));
         student.setName("张三2");
         session.save(student);
 
         // 提交事务
         session.getTransaction().commit();
         // 关闭session
         session.close();
     }
 
     /**
      * 查询
      */
     private void getAllStudent(){
         // 生成一个session
         Session session=sessionFactory.openSession();
         // 开启事务
         session.beginTransaction(); 
 
         String hql="from Student";
         Query query=session.createQuery(hql);
         List<Student> studentList=query.list();
         for(Student student:studentList){
             System.out.println(student);
         }
 
         // 提交事务
         session.getTransaction().commit();
         // 关闭session
         session.close();
     }
 
     public static void main(String[] args) {
         StudentTest studentTest=new StudentTest();
         studentTest.add();
 //        studentTest.delete();
 //        studentTest.update();
 //        studentTest.getAllStudent();
     }
 }

第三节：注解版CRUD 实现

导入对应的hibernate的jar包、mysql的jar包和添加每次都需要用到的HibernateUtil.java

hibernate.cfg.xml

 <?xml version='1.0' encoding='utf-8'?>
 <!DOCTYPE hibernate-configuration PUBLIC
         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 
 <hibernate-configuration>
 
     <session-factory>
 
         <!--数据库连接设置 -->
         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
         <property name="connection.username">root</property>
         <property name="connection.password">123456</property>
 
         <!-- 方言 -->
         <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
 
         <!-- 控制台显示SQL -->
         <property name="show_sql">true</property>
 
         <!-- 自动更新表结构 -->
         <property name="hbm2ddl.auto">update</property>
 
         <!-- 注解版CRUD 实现 -->
         <mapping class="com.wishwzp.model.Teacher"/>
     </session-factory>
 
 </hibernate-configuration>

Teacher.java

 package com.wishwzp.model;
 
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
 import javax.persistence.Table;
 
 import org.hibernate.annotations.GenericGenerator;
 
 //实体
 @Entity
 //这个是你指定是数据库哪张表,我这里指定的是t_teacher
 @Table(name="t_teacher")
 public class Teacher {
 
     private long id;
     private String name;
 
     @Id//主键
     @GeneratedValue(generator="_native")//这里开始使用名为_native的策略
     @GenericGenerator(name="_native",strategy="native")//这里定义一个名为_native的策略，是native
     public long getId() {
         return id;
     }
     public void setId(long id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     @Override
     public String toString() {
         return "Teacher [id=" + id + ", name=" + name + "]";
     }
 
 }

TeacherTest.java

 package com.wishwzp.service;
 
 import java.util.List;
 
 import org.hibernate.Query;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 
 import com.wishwzp.model.Teacher;
 import com.wishwzp.util.HibernateUtil;
 
 public class TeacherTest {
 
     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
 
     public void add(){
         Session session=sessionFactory.openSession(); // 生成一个session
         session.beginTransaction(); // 开启事务
 
         Teacher s=new Teacher();
         s.setName("张三");
         session.save(s);
 
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
     }
 
     public void delete(){
         Session session=sessionFactory.openSession(); // 生成一个session
         session.beginTransaction(); // 开启事务
 
         Teacher Teacher=(Teacher)session.get(Teacher.class, Long.valueOf(1));
         session.delete(Teacher);
 
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
     }
 
     public void update(){
         Session session=sessionFactory.openSession(); // 生成一个session
         session.beginTransaction(); // 开启事务
 
         Teacher Teacher=(Teacher)session.get(Teacher.class, Long.valueOf(2));
         Teacher.setName("张三2");
         session.save(Teacher);
 
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
     }
 
     public void getAllTeacher(){
         Session session=sessionFactory.openSession(); // 生成一个session
         session.beginTransaction(); // 开启事务
 
         String hql="from Teacher";
         Query query=session.createQuery(hql);
         List<Teacher> TeacherList=query.list();
         for(Teacher Teacher:TeacherList){
             System.out.println(Teacher);
         }
 
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
     }
 
     public static void main(String[] args) {
         TeacherTest TeacherTest=new TeacherTest();
         // TeacherTest.add();
         // TeacherTest.delete();
         // TeacherTest.update();
         TeacherTest.getAllTeacher();
     }
 }

注释版的我们就不需要在去配置XXX.hbm.xml了。

第四节：Junit4 单元测试框架引入

导入对应的junit包

百度云：http://pan.baidu.com/s/1dFBbhhZ

密码：3z1i

在测试版CRUD的基础上，我们运用junit重写了运行主类mian()。

TeacherTest2.java

 package com.wishwzp.service;
 
 import java.util.List;
 
 import org.hibernate.Query;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.junit.Test;
 
 import com.wishwzp.model.Teacher;
 import com.wishwzp.util.HibernateUtil;
 
 public class TeacherTest2 {
 
     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
 
     @Test
     public void testAdd() {
         Session session=sessionFactory.openSession(); // 生成一个session
         session.beginTransaction(); // 开启事务
 
         Teacher s=new Teacher();
         s.setName("张三");
         session.save(s);
 
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
     }
 
     @Test
     public void testDelete() {
         Session session=sessionFactory.openSession(); // 生成一个session
         session.beginTransaction(); // 开启事务
 
         Teacher Teacher=(Teacher)session.get(Teacher.class, Long.valueOf(2));
         session.delete(Teacher);
 
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
     }
 
     @Test
     public void testUpdate() {
         Session session=sessionFactory.openSession(); // 生成一个session
         session.beginTransaction(); // 开启事务
 
         Teacher Teacher=(Teacher)session.get(Teacher.class, Long.valueOf(3));
         Teacher.setName("张三2");
         session.save(Teacher);
 
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
     }
 
     @Test
     public void testGetAllTeacher() {
         Session session=sessionFactory.openSession(); // 生成一个session
         session.beginTransaction(); // 开启事务
 
         String hql="from Teacher";
         Query query=session.createQuery(hql);
         List<Teacher> TeacherList=query.list();
         for(Teacher Teacher:TeacherList){
             System.out.println(Teacher);
         }
 
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
     }
 
 }