（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
    }

}