JavaWeb学习笔记-Hibernate-01-概述

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本文介绍了一个使用Hibernate框架实现的对象关系映射(ORM)示例。通过具体的Java代码和配置文件展示了如何将Java对象映射到数据库表，并演示了基本的保存操作。

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ORM
object relation mapping

example

        <!-- 添加Hibernate依赖 -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate</artifactId>
            <version>3.0.5</version>
        </dependency>

    <!--添加mysql驱动依赖-->
    <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.25</version>
        </dependency>

public class User {
    private int id;
    private String name;
    private Date birthday;

    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 Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
}

User.hbm.xml–映射文件

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping
    package="com.java.test.domain">
    <class name="User">
        <id name="id">
            <generator class="native"/>
        </id>
        <property name="name"/>
        <property name="birthday"/>
    </class>
</hibernate-mapping>

hibernate.cfg.xml–Hibernate配置

<?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>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">936457xin</property>

        <!-- 方言 -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <!--自动创建表-->
        <property name="hibernate.hbm2ddl.auto">create</property>

        <!--映射路径-->
        <mapping resource="com/java/User.hbm.xml"/>

    </session-factory>
</hibernate-configuration>

public class Base {
    public static void main(String[] agrs){
        //初始化
        Configuration cfg = new Configuration();
        cfg.configure();
        SessionFactory sf = cfg.buildSessionFactory();

        Session s = sf.openSession();
        Transaction tx = s.beginTransaction();//开启事务
        User user = new User();
        user.setBirthday(new Date());
        user.setName("name");
        s.save(user);
        tx.commit();//提交
        s.close();
        System.out.println("end");
    }
}