【Hibernate学习杂记】最简单的Hibernate配置实用

下面写的东西是博主学习的时候的笔记，如果有错漏或者看不懂，请留言！能互相进步是件不错的事情，谢谢！

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1、导入我们的jar包

window->perferences->java->build path->user libraries

在这里new新建一个library

如下图

2、新建java project

2.1、导入library

导入相应的数据库驱动程序

2.2、写配置文件

在src目录下面新建hibernate.cfg.xml文件

<?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>        <!-- Database connection settings -->        <property name="connection.driver_class">com.mysql.jdbc.Driver</property><!-- 这里是数据库的驱动程序 -->        <property name="connection.url">jdbc:mysql://localhost/hibernate</property><!-- 这里是数据库的链接   hibernate填响应的数据库名        <property name="connection.username">root</property><!--这里是数据库的用户名 -->        <property name="connection.password">password</property><!--这里是数据库的密码 -->        <!-- JDBC connection pool (use the built-in) -->        <!-- <property name="connection.pool_size">1</property> -->        <!-- SQL dialect -->        <property name="dialect">org.hibernate.dialect.MySQLDialect</property><!-- 数据库方言 在文档可以找到响应的参数 -->        <!-- Enable Hibernate's automatic session context management -->        <!-- <property name="current_session_context_class">thread</property> -->        <!-- Disable the second-level cache  -->        <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>        <!-- Echo all executed SQL to stdout -->        <property name="show_sql">true</property><!-- 勾上了 -->        <!-- Drop and re-create the database schema on startup -->        <!-- <property name="hbm2ddl.auto">update</property> -->        <mapping class="bat.test.model.Student" /> <!-- 使用annotation 这里直接写上类名即可-->              </session-factory></hibernate-configuration>

这个文件一定要记住在文档里面拷贝

3、新建类

这个项目有两个类

一个是model类

model代码

package bat.test.model;import javax.persistence.Entity;import javax.persistence.Id;import javax.persistence.Table;@Entity//@Table(name="Student", catalog="hibernate")public class Student {private int id;private String name;private int age;@Idpublic 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 int getAge() {return age;}public void setAge(int age) {this.age = age;}}

另一个用于测试的

import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;import org.hibernate.metamodel.source.internal.MetadataImpl;import org.hibernate.service.ServiceRegistry;import org.hibernate.service.ServiceRegistryBuilder;import bat.test.model.Student;public class StudentTest {public static void main(String[] args) {Student s = new Student();//s.setId(1);s.setName("s1");s.setAge(1);Configuration cfg = new Configuration();          cfg.configure();//读取配置文件                ServiceRegistry serviceRegistry =new ServiceRegistryBuilder().          applySettings(cfg.getProperties()).buildServiceRegistry();                    SessionFactory factory = cfg.buildSessionFactory(serviceRegistry);                   Session session = factory.openSession();          session.beginTransaction();          session.save(s);          session.getTransaction().commit();          session.close();          factory.close();   }}

建相应的数据库和数据表

CREATE TABLE `Student` (`id`  int(11)  ,`name`  varchar(20) ,`age`  int(11) )

现在可以运行测试了