hibernate最初印象---helloworld的实现

最近，由于种种原因，开始接触hibernate，今天实现了第一个hibernate的入门程序，也就是经典的helloworld，个人喜欢在框架学习的时候，把最基本的helloworld程序的开发过程详细的写下来，以备日后搭建环境时作为参考，步入正题，说说hibernate的helloworld的开发。

以贴图为主，先来看看hibernate工程的目录结构

目录的结构很清晰，额外说一句，我是采用的hibernate4的jar包，具体下载，详见hibernate官网的下载目录，还有我采用的是mysql的数据库，所以，mysql的连接jar文件必不可少

Studnet是一个model，具体实现，参见下面代码

 

package com.bjsxt.hibernate.model;

public class Student {
	private int id;
	private String name;
	private int age;
	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 int getAge() {
		return age;
	} 
	public void setAge(int age) {
		this.age = age;
	}
	
}

 

 hibernate的配置文件

 

<?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 resource="com/bjsxt/hibernate/model/Student.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

 

hibernate的映射关系配置文件

   <?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="com.bjsxt.hibernate.model">

    <class name="Student" table="student">
        <id name="id">
        </id>
        <property name="name"/>
        <property name="age"/>
    </class>

</hibernate-mapping>

 用于测试hibernate的java类

 

package com.bjsxt.hibernate.model;

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

public class StudentTest {

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

 

 运行结果

  2011-12-22 10:34:13 org.hibernate.annotations.common.Version <clinit>

INFO: HCANN000001: Hibernate Commons Annotations {4.0.0.CR2}
2011-12-22 10:34:13 org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.0.0.CR5}
2011-12-22 10:34:13 org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
2011-12-22 10:34:13 org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
2011-12-22 10:34:13 org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
2011-12-22 10:34:13 org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
2011-12-22 10:34:13 org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity
WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
2011-12-22 10:34:13 org.hibernate.cfg.Configuration addResource
INFO: HHH000221: Reading mappings from resource: com/bjsxt/hibernate/model/Student.hbm.xml
2011-12-22 10:34:13 org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity
WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
2011-12-22 10:34:13 org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
2011-12-22 10:34:13 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)
2011-12-22 10:34:13 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000115: Hibernate connection pool size: 20
2011-12-22 10:34:13 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000006: Autocommit mode: false
2011-12-22 10:34:13 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/hibernate]
2011-12-22 10:34:13 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000046: Connection properties: {user=root, password=****}
2011-12-22 10:34:14 org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
2011-12-22 10:34:14 org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)
2011-12-22 10:34:14 org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
Hibernate: insert into student (name, age, id) values (?, ?, ?)
2011-12-22 10:34:14 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
INFO: HHH000030: Cleaning up connection pool [jdbc:mysql://localhost:3306/hibernate]

 

 

 

基本就这些了，做点备注吧

 

首先，本身的目录的结构是约定俗称的一种配置，包括文件的命名
其次，hibernate的映射文件，必须保证要数据库中要有相应的表与之对应，或者名称是对应的，或者，自行指定也可以
最后，hibernate的映射文件中，id是代表了表的主键值，property是其它的属性值

特别提醒：
     对于配置文件，最好还是从原始的参考文档中直接复制粘贴，而不要自己敲或者其它什么的，没啥技术含量，而且容易出错

如果在细节上，有什么问题，可以针对性的交流

 

 

 

评论

3 楼 qi90mufeng 2012-10-19  

刚好我正需要，谢谢了

2 楼 mlc0202 2012-05-18  

freedxz 写道

好几个 WARN 不处理一下？

这个只是当时做的一个入门程序，跑起来看到效果就行

1 楼 freedxz 2012-05-18  

好几个 WARN 不处理一下？