hibernate学习笔记一

由于好长时间不用hibernate,故抽时间将这部分知识温习一下。在此记录一下自己的学习进度。好了,直接上代码

 

首先,先准备hibernate开发要用到的jar包,本次学习中使用的hibernate版本是3.4.0,上图:

 

hibernate学习笔记一

准备好要用到的jar包,下面就开始真正的开发,我的开发环境是Eclipse helios 版本。

下一步,让我新建一个java project ,命名为spring_hibernate_day01,上图:

hibernate学习笔记一

其中,model包下是实体类,还有hibernate映射文件,默认约定映射文件和实体类放在一起。

hibernate.cfg.xml 是hibernate的核心配置文件

test包下用来进行相应的测试。

好,直接上代码

model 类 Teacher:

import java.util.Date;



public class Teacher {

	private int id;

	private String name;

	private String address;

	private Date year;

	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 String getAddress() {

		return address;

	}

	public void setAddress(String address) {

		this.address = address;

	}

	public Date getYear() {

		return year;

	}

	public void setYear(Date year) {

		this.year = year;

	}



}

 

映射文件teacher.hbm.xml:

<?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="cn.**.hibernate.model">

	<class name="Teacher">

		<id name="id">

			<generator class="native"/>

		</id>

		<property name="name"/>

		<property name="address"/>

		<property name="year"/>

	</class>

</hibernate-mapping>

 

hiberante的核心配置文件,hibernate.cfg.xml:

<?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>



        <!-- Database connection settings -->

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql://localhost/test</property>

        <property name="connection.username">root</property>

        <property name="connection.password">123456</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>



        <!-- Enable Hibernate's automatic session context management -->

        <!--<property name="current_session_context_class">thread</property>-->



        <!-- Disable the second-level cache  -->

        <property name="cache.provider_class">org.hibernate.cache.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="cn/***/hibernate/model/teacher.hbm.xml"/>



    </session-factory>



</hibernate-configuration>


好,到此所有的代码都已经完成,下面让我们进行一下测试,看数据是否能保存到数据库里,上代码


TeacherTest:

public class TeacherTest {



	/**

	 * @param args

	 */

	public static void main(String[] args) {

		Teacher t = new Teacher();

		t.setName("name");

		t.setAddress("beijing");

		t.setYear(new Date());

		

		Configuration cfg = new Configuration();

		SessionFactory sf = cfg.configure().buildSessionFactory();

		

		Session session = sf.openSession();

		session.beginTransaction();

		session.save(t);

		session.getTransaction().commit();

		session.close();

		sf.close();

	}



}


让我们查一下数据库,看数据是否保存到数据库中,上图:

hibernate学习笔记一

 

到此,我们就完成了hibernate第一次的学习记录,有需要讨论的童鞋,请给我留言。。。

 

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