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: