Hibernate简介

1. Hibernate简介

Hibernate官网：http://hibernate.org

版本：hibernate-release-4.3.5.Final

Hibernate是一个开放源代码的对象关系映射框架，它对JDBC进行了非常轻量级的对象封装，使得Java程序员可以随意的使用对象编程思维来操纵数据库。Hibernate可以应用在任何使用JDBC的场合，既可以在Java的客户端程序使用，也可以在Servlet/JSP的Web应用中使用，最具意义的是，Hibernate可以在应用EJB的J2EE架构中取代CMP，完成数据持久化的重任。
ORM框架，对象关系映射(Object/Relation Mapping)。

   
2. Jar包导入，右键buildPath

1) hibernate jar包

antlr-2.7.7.jar
dom4j-1.6.1.jar
hibernate-commons-annotations-4.0.4.Final.jar
hibernate-core-4.3.5.Final.jar
hibernate-jpa-2.1-api-1.0.0.Final.jar
jandex-1.1.0.Final.jar
javassist-3.18.1-GA.jar
jboss-logging-3.1.3.GA.jar
jboss-logging-annotations-1.2.0.Beta1.jar
jboss-transaction-api_1.2_spec-1.0.0.Final.jar

2) mysql jar包

mysql-connector-java-3.1.12-bin.jar

3. HelloWorld实现

新建项目Hibernate01

Student.java

package com.andrew.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;
    }
}

Student.hbm.xml

<?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.andrew.model">
    <class name="Student" table="t_student">
        <id column="stuId" name="id">
            <generator class="native"/>
        </id>
        <property generated="never" lazy="false" name="name"/>
    </class>
</hibernate-mapping>

hibernate.cfg.xml

<?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/hibernate4</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>
        <!-- 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>
        <!-- Mapper -->
        <mapping resource="com/andrew/model/Student.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

StudentTest.java

package com.andrew.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.andrew.model.Student;
public class StudentTest {
    public static void main(String[] args) {
        // 1. 实例化配置文件
        Configuration configuration = new Configuration().configure();
        // 2. 实例化服务登记
        ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build(); 
        // 3. 获取Session工厂
        SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
        // 4. 生成一个session
        Session session = sessionFactory.openSession();
        // 5. 开启事务
        session.beginTransaction();

        Student s = new Student();
        s.setName("张三");
        session.save(s);
        
        // 6. 提交事务
        session.getTransaction().commit();
        // 7. 关闭session
        session.close();
        // 8. 关闭session工厂
        sessionFactory.close();
    }
}

运行结果：
Hibernate: insert into t_student (name) values (?)