1、环境搭建
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2、项目结构
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3、hibernate.cfg.xml配置文件
<!--
~ Hibernate, Relational Persistence for Idiomatic Java
~
~ License: GNU Lesser General Public License (LGPL), version 2.1 or later.
~ See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
-->
<!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 >
<!--1、配置数据库连接的四个参数-->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql:///hibernate_day1?serverTimezone=UTC</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">123</property>
<!--是否显示sql语句-->
<property name="show_sql">true</property>
<!--是否格式化sql语句-->
<property name="format_sql">true</property>
<!--是否自动提交事务 -->
<property name="connection.autocommit">true</property>
<!--
hibernate.hbm2ddl.auto
update：如果数据库没表，自动帮你创建表
如果数据库表与hbm不一致，则进行更新
create：每次启动都帮你创建表
create-drop:每次启动都帮你创建表，执行后删除
配置映射文件和表的关系-->
<property name="hibernate.hbm2ddl.auto">update</property>
<!--数据方言-->
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<!--2、配置JavaBean与表的映射-->
<mapping resource="com/wsx/hibernate/Entity/User.hbm.xml"></mapping>
</session-factory>
</hibernate-configuration>
4、User类和User.hbm.xml配置文件
package com.wsx.hibernate.Entity;
public class User {
private int uid;
private String username;
private String password;
public User(String username, String password) {
this.username = username;
this.password = password;
}
public User() {
}
public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User{" +
"uid=" + uid +
", username='" + username + '\'' +
", userpass='" + password + '\'' +
'}';
}
}
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!-- name :模型的全名称 table：表的全名称-->
<class name="com.wsx.hibernate.Entity.User" table="t_user">
<!--name：模型属性名 coulumn：列名-->
<id name="uid" column="id">
<!--generatot：id生成策略 native：如果是mysql数据库，id会自动增长-->
<generator class="native"></generator>
</id>
<!--如果模型属性和数据库列名就不用写coulumn-->
<property name="username" ></property>
<property name="password"></property>
</class>
</hibernate-mapping>
5、HibernateUtil工具类
public class HibernateUtil {
private static SessionFactory sessionFactory;
static {
//1、获取核心配置文件对象，默认是加载src的hibernate.cfg.xml文件
//new Configuration（）默认读properties文件 new Configuration().configure默认读xml文件
//若xml文件没有配置映射可通过代码添加映射可通过 cf.addResource(String path);
Configuration cf=new Configuration().configure();
//2、创建会话工厂
sessionFactory=cf.buildSessionFactory();
//监听程序关闭
Runtime.getRuntime().addShutdownHook(new Thread(){
@Override
public void run() {
System.out.println("程序关闭");
sessionFactory.close();
}
});
}
public static Session openSession(){
return sessionFactory.openSession();
}
public static Session getCurrentSession(){
return sessionFactory.getCurrentSession();
}
}
6、运行测试
1、插入一条数据
Session session= HibernateUtil.openSession();
//开启事务
session.getTransaction().begin();
//保存
User user=new User();
user.setUsername("张三丰1");
user.setPassword("123");
session.save(user);
//提交事务
session.getTransaction().commit();
//7、关闭会话
session.close();
2、事务自动提交【配置事务提交】，可不用Begin和commit；
Session session= HibernateUtil.openSession();
User user=new User();
user.setUsername("事务自动提交");
user.setPassword("123");
session.save(user);
//关闭
session.close();
