Hibernate4学习之HelloWorld(一)

Hibernate4：开源的对象关系映射框架（ORM）

hibernate4：入门实例

1.hibernate官网下载hibernate4源码，在项目中引入lib/required目录下的全部包（10个）和数据库驱动包

2.连接mysql，创建数据库hibernate
3.配置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>

        <!--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>


        <!-- 数据库方言 -->
        <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>

        <mapping resource="com/newbeedaly/model/Student.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

4.创建Student类和Student.hbm.xml文件，在hibernate.cfg.xml引入。

package com.newbeedaly.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;
    }


}

<?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.newbeedaly.model">

    <class name="Student" table="t_student">
        <id name="id" column="stuId">
            <generator class="native"></generator>
        </id>

        <property name="name"></property>
    </class>

</hibernate-mapping>

5.创建Student测试类

package com.newbeedaly.service;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

import com.newbeedaly.model.Student;

public class StudentTest {

    public static void main(String[] args) {

        Configuration configuration=new Configuration().configure(); // 实例化配置文件
        ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build(); // 实例化服务登记
        SessionFactory sessionFactory=configuration.buildSessionFactory(serviceRegistry); // 获取Session工厂
        Session session=sessionFactory.openSession(); // 生成一个session
        session.beginTransaction(); // 开启事务

        Student s=new Student();
        s.setName("张三");
        session.save(s);

        session.getTransaction().commit(); // 提交事务
        session.close(); // 关闭session
        sessionFactory.close(); // 关闭session工厂
    }
}

运行测试类测试。