使用hibernate 框架搭建的helloworld

在学框架hibernate 框架的时候走了很多的弯路

版本：

将第一个hibernate记录下来

首先 是搭建的结构：

hibernate.cfg.xml文件内容：

<?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>
    
    <!-- 链接数据库基本信息 -->
    <property name="connection.username">root</property>
    <property name="connection.password">123456</property>
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>  
    <property name="connection.url">jdbc:mysql:///test</property>
    
    <!-- 配置hibernate的基本信息  数据库方言 -->
    <property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
   
    <!-- 执行操作时是否在控制台打印 SQL -->
    <property name="show_sql">true</property>
    
    <!-- 是否对 SQL 进行格式化 -->
    <property name="format_sql">true</property>
    
    <!-- 指定自动生成数据表的策略 -->
    <property name="hbm2ddl.auto">update</property>
        
    <!-- 指定关联的 .hbm.xml 文件 -->
    <mapping resource="com/atguigu/hibernate/helloworld/mytest.hbm.xml"/>
    
    </session-factory>
</hibernate-configuration>

mytest.java文件：

package com.atguigu.hibernate.helloworld;

public class mytest {
    int id;
    String name;
    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;
    }
    public mytest(String name) {
        super();
        this.name = name;
    }
    public mytest()
    {
        
    }
    @Override
    public String toString() {
        return "mytest [id=" + id + ", name=" + name + "]";
    }
}

mytest.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2016-8-7 3:19:11 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
    <class name="com.atguigu.hibernate.helloworld.mytest" table="MYTEST">
        <id name="id" type="int">
            <column name="ID" />
            <generator class="native" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="NAME" />
        </property>
    </class>
</hibernate-mapping>

HibernateTest.java文件  jUnit测试

package com.atguigu.hibernate.helloworld;

import static org.junit.Assert.*;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.junit.Test;

public class HibernateTest {

    @Test
    public void test() {
        //1. 创建一个 SessionFactory 对象
        SessionFactory  sessionFactory = null;
       //1). 创建 Configuration 对象: 对应 hibernate 的基本配置信息和 对象关系映射信息
        Configuration configuration =  new Configuration().configure();

         //4.0 之前这样创建
          // sessionFactory = configuration.buildSessionFactory();

          //2). 创建一个 ServiceRegistry 对象: hibernate 4.x 新添加的对象 
           //hibernate 的任何配置和服务都需要在该对象中注册后才能有效. 但是这个也已经失效了 
            //  ServiceRegistry serviceRegistry =
             //  new ServiceRegistryBuilder().applySettings(configuration.getProperties())
             //.buildServiceRegistry();

       //2). 创建一个StandardServiceRegistry

         StandardServiceRegistryBuilder standardServiceRegistryBuilder = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties());
 StandardServiceRegistry standardServiceRegistry = standardServiceRegistryBuilder.build(); 
sessionFactory = configuration.buildSessionFactory(standardServiceRegistry);
 Session session = sessionFactory.openSession(); //3. 开启事务 Transaction transaction = session.beginTransaction(); 

//4. 执行保存操作 
mytest my = new mytest ("ATGUIGU"); session.save(my); 

//5. 提交事务 

  transaction.commit(); 

//6. 关闭 Session 

session.close(); 

//7. 关闭 SessionFactory 对象 

 sessionFactory.close(); } }

运行结果：