hibernate4之hello world(基础环境搭建)

       刚开始复习hibernate，刚复习时，发现全忘了，连环境搭建都不会了，等于从头再来啊，没办法硬着头皮，只得从头再来了。

       hibernate是一款优秀的ORM框架，即object relation mapping 对象关系映射。我的理解就是自动把pojo类对象的操作转为对数据库中相应表的操作。简单说就是创建一个pojo类对象，那么数据库中相应的表中也会插入这么一个对象。修改，删除，当然也是的了。可以理解就是尽可能的隔离数据库操作与java开发。

一、下载hibernate jar包

在http://www.hibernate.org/中找到需要的hibernate版本。我下载的是最新的hibernate-release-4.3.1.Final 。

二、复制jar包

复制在lib/required下的所有jar包到项目的lib文件夹下

三、部署hibernate.cfg.xml,相应的pojo 的Student.hbm.xml

在项目的src目录下新建hibernate.cfg.xml文件。在documentation/manual/en-US/html_single/index.html

<?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>

        <!-- Database connection settings -->
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@127.0.0.1:1521:lubby</property>
        <property name="connection.username">admin</property>
        <property name="connection.password">admin</property>

    
        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>

       
        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <!-- <property name="hbm2ddl.auto">update</property> -->

        <mapping resource="com/lubby/pojo/Student.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

 <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>

      <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

 <mapping resource="com/lubby/pojo/Student.hbm.xml"/>

四、创建pojo类Student

package com.lubby.pojo;

public class Student {
	private String sid;
	private String sname;
	private int age;
	public Student() {
		super();
		// TODO Auto-generated constructor stub
	}
	public Student(String sid, String sname, int age) {
		super();
		this.sid = sid;
		this.sname = sname;
		this.age = age;
	}
	public String getSid() {
		return sid;
	}
	public void setSid(String sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "Student [sid=" + sid + ", sname=" + sname + ", age=" + age
				+ "]";
	}
	
}

每个pojo类都有一个相应的配置文件。都放在pojo类所在的包里面。

<?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.lubby.pojo">
	<class name="Student" table="tab_stu">
		<id name="sid" column="sid"></id>
		<property name="sname" column="sname"></property>
		<property name="age" column="age"></property>
	</class>
</hibernate-mapping>

<class name="Student" table="tab_stu">	</class>

table:数据库中对应表名

<id name="sid" column="sid"></id>

<property name="sname" column="sname"></property>
<property name="age" column="age"></property>

六、调用hibernate

package com.lubby.main;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.jboss.weld.logging.messages.EventMessage;

import com.lubby.pojo.Student;

public class StudentTest {
	
	public static void main(String args[]){
		Student stu = new Student();
		stu.setSid("3");
		stu.setAge(25);
		stu.setSname("李惠堂");
		Configuration  cfg = new Configuration();
		SessionFactory sf = cfg.configure().buildSessionFactory();
		Session session = sf.openSession();
		session.beginTransaction();
		session.save(stu);
		session.getTransaction().commit();
		session.close();	
		sf.close();
	
	}
}

hibernate4之hello world(基础环境搭建)

原文：http://blog.csdn.net/liu00614/article/details/19176813