Hibernate入门篇

下面以Hibernate官方站点提供的HibernateTools作为插件来开发Hibernate应用：

1，下载安装HibernateTools；

2，新建工程，添加类库

　　1>Mysql驱动；

　　2>hibernate-release-4.3.10.Final\lib\required下的10个jar包；

　　3> hibernate-release-4.3.10.Final\lib\optional\c3p0下的3个jar包；

3，创建hibernate.cfg.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!--指定链接数据库所用的驱动  -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <!--指定连接数据库的密码  -->
        <property name="hibernate.connection.password">123456</property>
        <!--指定连接数据库的url，其中anliwendb是本应用连接的数据库名  -->
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/db</property>
        <!--指定连接数据库的用户名  -->
        <property name="hibernate.connection.username">root</property>
        <!--指定数据库方言  -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        <!--指定连接池里最大连接数  -->
        <property name="hibernate.c3p0.max_size">20</property>
        <!--指定连接池里最小连接数  -->
        <property name="hibernate.c3p0.min_size">1</property>
        <!--指定连接池里连接的超时时长  -->
        <property name="hibernate.c3p0.timeout">5000</property>
        <!--指定连接池里最大缓存多少个Statement对象  -->
        <property name="hibernate.c3p0.max_statements">100</property>
        <property name="hibernate.c3p0.idle_test_period">3000</property>
        <property name="hibernate.c3p0.acquire_increment">2</property>
        <property name="hibernate.c3p0.validate">true</property>
        <!--根据需要自动创建表  -->
        <property name="hbm2ddl.auto">update</property>
        <!--显示hibernate持久化操作所生成的sql -->
        <property name="show_sql">true</property>
        <!--将sql脚本格式化在进行输出  -->
        <property name="hibernate.format_sql">true</property>
        <!--罗列所有持久化的类名  -->
        <mapping class="com.anlw.news.News"/>
    </session-factory>
</hibernate-configuration>

4，创建POJO文件

package com.anlw.news;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="testtable")
public class News {
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer id;
    private String title;
    private String content;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }

}

5，主程序

package com.anlw.news;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class Manager {
    public static void main(String[] args) {
        //实例化Configuration

        Configuration conf = new Configuration().configure();
        ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().
                applySettings(conf.getProperties()).buildServiceRegistry();
        //以Configuration实例创建SessionFactory实例
        SessionFactory sf = conf.buildSessionFactory(serviceRegistry);
        //创建Session
        Session sess = sf.openSession();
        //开始事物
        Transaction tx = sess.beginTransaction();
        //创建消息对象
        News n = new News();
        //设置消息的标题和内容
        n.setTitle("这是title");
        n.setContent("这是content");
        //保存消息
        sess.save(n);
        //提交事物
        tx.commit();
        //关闭session
         sess.close();
         sf.close();
         System.out.println("ok");

    }
}