Hibernate4Step1

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hardwork

本着应用的目的快速学习Hibernate4框架

  • 初识Hibernate

版本

本人使用的是Hibernate4.3.5Final版本，使用之前需要将Hibernate中lib下的required中的所有jar包导入工程目录中。

前面的话

本节主要介绍

  1. 获取SessionFactory和Session
  2. 使用映射文件和注解两种方式进行简单的增删改查操作

hibernate.cfg.xml

位置：该文件应放置于src目录下

内容：

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<?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>

        <!--数据库连接设置 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql:///db_hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">123456</property>

       
        <!-- 方言 -->
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
	
        <!-- 控制台显示SQL -->
        <property name="show_sql">true</property>

        <!-- 自动更新表结构 -->
        <property name="hbm2ddl.auto">update</property>
        
  		<mapping resource="cn/codeforgod/model/Student.hbm.xml"/>
		<mapping class="cn.codeforgod.model.Teacher"/>
    </session-factory>

</hibernate-configuration>

注意：

<mapping resource="cn/codeforgod/model/Student.hbm.xml"/>

Student类的映射规则,使用hbm映射文件方式

<mapping class="cn.codeforgod.model.Teacher"/>

Teacher类的映射规则，使用类注解方式

编写Student类

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package cn.codeforgod.model;


public class Student
{
	private long id;
	private String name;

	public long getId()
	{
		return id;
	}

	public void setId(long id)
	{
		this.id = id;
	}

	public String getName()
	{
		return name;
	}

	public void setName(String name)
	{
		this.name = name;
	}

}

编写Student.hbm.xml

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<?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="cn.codeforgod.model">

	<class name="Student" table="t_student">
		<id name="id" column="stu_id">
			<generator class="native"></generator>
		</id>
		
		<property name="name" column="name"></property>
	</class>

</hibernate-mapping>

HibernateUtil

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package cn.codeforgod.util;


import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class HibernateUtil
{
	private static SessionFactory sessionFactory;

	static
	{
		// 实例化配置文件
		Configuration configuration = new Configuration().configure();

		
		// 实例化服务登记
		ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
				.applySettings(configuration.getProperties()).build();

		// 获取Session工厂
		sessionFactory = configuration
				.buildSessionFactory(serviceRegistry);
	}
	
	public static SessionFactory getSessionFactory()
	{
		return sessionFactory;
	}
}

JUnit测试

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package cn.codeforgod.test;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import cn.codeforgod.model.Student;
import cn.codeforgod.model.Teacher;
import cn.codeforgod.util.HibernateUtil;

public class HibernateUtilTest
{
	public SessionFactory sessionFactory;
	public Session session;
	
	@Before
	public void before()
	{

		sessionFactory = HibernateUtil.getSessionFactory();
		session = sessionFactory.openSession();
		session.beginTransaction();
	}
	
	@Test
	public void test()
	{	
		add();
//		delete();
//		update();
//		getAll();
//		saveT();
	}
	
	@After
	public void after()
	{
		session.getTransaction().commit();
		session.close();
		sessionFactory.close();
	}

	public void add()
	{
		
		Student s = new Student();
		s.setName("sfa");
		session.save(s);
	}
	
	public void delete()
	{
		Object o = session.get(Student.class, Long.valueOf(1));
		if(o == null)
		{
			System.out.println("id为1的Student不存在");
			return;
		}
		session.delete(o);
	}
	
	public void update()
	{
		Student student = (Student) session.get(Student.class, Long.valueOf(6));
		student.setName("xxx");
		session.save(student);
	}
	
	public void getAll()
	{
		String hql = "from Student";
		Query query = session.createQuery(hql);
		
		@SuppressWarnings("rawtypes")
		List list = query.list();
		for(Object o : list)
		{
			System.out.println(o);
		}
	}
	
	//savaTeacher
	public void saveT()
	{
		Teacher s = new Teacher();
		s.setName("sfa");
		session.save(s);
	}
}

注意：
这里可以不建表，因为Hibernate会自动建表。

使用Annotation建立Teacher类

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package cn.codeforgod.model;


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

import org.hibernate.annotations.GenericGenerator;

@Entity
@Table(name = "t_teacher")
public class Teacher
{
	private int id;
	private String name;

	@Id
	@GeneratedValue(generator="_native")
	@GenericGenerator(name="_native", strategy="native")
	@Column(name="tea_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;
	}

}

对于JUnit测试中的SaveT方法，其它方法一样。

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