hibernate的Anotation的应用

A friend is never known till a man has need. 需要之时方知友

主要以代码为主，首先来看看代码的目录结构，主要的是采用黄色标识出的，没有标识的与Student有关的，都是和现在所说的Anotation无关

 

 

Teacher的model原型，注意里面的Anotation标识

 

 

package com.bjsxt.hibernate.model;

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

@Entity
public class Teacher {
	private int id;
	private String name;
	private String title;
	@Id
	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 getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	
}

 

 hibernate.cfg.xml的配置

 

<?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:3306/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">mlc</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 class="com.bjsxt.hibernate.model.Teacher"/>
		
    </session-factory>

 

 

代码测试类

 

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

import com.bjsxt.hibernate.model.Student;
import com.bjsxt.hibernate.model.Teacher;

public class TeacherTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Teacher tea= new Teacher();
		tea.setTitle("mlc");
		tea.setId(2);
		tea.setName("mlc");
		
		Configuration cf = new  AnnotationConfiguration();
		SessionFactory sf = cf.configure().buildSessionFactory();
		Session session =sf.openSession();
		session.beginTransaction();
		session.save(tea);
		session.getTransaction().commit();
		session.close();
		sf.close();
	}
}

 

 

很明显采用了Anotation之后，hibernate的应用变得更为简介，具体问题可以针对性的讨论