Hibernate的配置

最新的Hibernate4.0感觉有点奇怪..它虽然给出了另外的annotation..但是似乎只要把Hibernate-release文件夹下的required的jar包引进就可以直接使用annotation了..

 

1.在src目录下新建一个hibernate.cfg.xml:

<?xml version='1.0' encoding='utf-8'?>
<!--
  ~ Hibernate, Relational Persistence for Idiomatic Java
  ~
  ~ Copyright (c) 2010, Red Hat Inc. or third-party contributors as
  ~ indicated by the @author tags or express copyright attribution
  ~ statements applied by the authors.  All third-party contributions are
  ~ distributed under license by Red Hat Inc.
  ~
  ~ This copyrighted material is made available to anyone wishing to use, modify,
  ~ copy, or redistribute it subject to the terms and conditions of the GNU
  ~ Lesser General Public License, as published by the Free Software Foundation.
  ~
  ~ This program is distributed in the hope that it will be useful,
  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  ~ or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
  ~ for more details.
  ~
  ~ You should have received a copy of the GNU Lesser General Public License
  ~ along with this distribution; if not, write to:
  ~ Free Software Foundation, Inc.
  ~ 51 Franklin Street, Fifth Floor
  ~ Boston, MA  02110-1301  USA
  -->
<!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>
        <property name="connection.url">jdbc:mysql://localhost:3306/shopping</property>
        <property name="connection.username">root</property>
        <property name="connection.password">1234</property>

        <!-- JDBC connection pool (use the built-in) -->
 <!-- 
        <property name="connection.pool_size">1</property>
 -->
        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        
        <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 把sql语句输出出来-->
        <property name="show_sql">true</property>
        
        <!-- 把sql语句更漂亮的输出出来-->
        <property name="format_sql">true</property>

        <!-- Drop and re-create the database schema on startup --> 
        <!-- 表示如果表存在则直接操作,若表不存在则创建表后再插入 -->        
       <property name="hbm2ddl.auto">update</property>  
          
 <!-- 用hbm来使用student类 
        <mapping resource="com/hibernate/model/Student.hbm.xml"/>
  -->
        
        <!-- 用annotation来使用teacher类
        <mapping class="com.hibernate.model.Teacher"/>
        -->
        
        <!--  
        <mapping class="com.hibernate.model.hql.Category"/>
        <mapping class="com.hibernate.model.hql.Topic"/>
        <mapping class="com.hibernate.model.hql.Msg"/>
        -->
 <mapping class="test.student"/>
    </session-factory>

</hibernate-configuration>

2.写一个model类:

package test;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity        //表示这个类是一张表
public class student {

    private int id;
    private String name;
    
    @Id        //主键
    @GeneratedValue            //自动递增
    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;
    }
    
    
    
}

3.写一个方法测试:

package test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

public class testHibernate {

    private static SessionFactory sf = null;
    
    public static void main(String[] args){
        sf = new AnnotationConfiguration().configure().buildSessionFactory();
        
        Session s = sf.getCurrentSession();
        s.beginTransaction();
        student stu = new student();
        stu.setName("ken");
        
        s.save(stu);
        s.getTransaction().commit();
    }
    
}

 

hibernate的hql非常方便,,有空也要试试各种hql语句,.!