Hibernate基础教程学习笔记(1)-优快云博客

本文介绍了一个使用Hibernate框架实现的消息存储和查询应用示例。该示例通过Java代码创建了一个Message实体类，并利用Hibernate进行数据库操作，包括保存消息和列出所有已保存的消息。

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第三章的第一个示例，主要功能为完成对Message信息的保存和查询出所有Message的列表。

需要用到的类库有：antlr.jar、asm.jar、cglib.jar、commons-collections.jar、commons-logging.jar、dom4j.jar、hibernate3.jar、jta.jar、log4j.jar、mysql-connector-java-bin.jar

用到的相关sql:
DROP database IF exists hibernate_test;
CREATE database hibernate_test;
use hibernate_test;
create table message(
id int(11) auto_increment,
message char(100),
primary key(id)
);

Message.java：

package sample.entity;


public class Message {

	private String message;


	public Message(String message) {

		this.message = message;

	}


	Message() {

	}


	public String getMessage() {

		return this.message;

	}


	public void setMessage(String message) {

		this.message = message;

	}

}

Message.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>

	<class name="sample.entity.Message" table="message">

		<id column="id" unsaved-value="-1" type="long">

			<generator class="native" />

		</id>

		<property name="message" column="message" type="string" />

	</class>

</hibernate-mapping>

PopulateMessages.java：

package sample;


import java.util.Date;


import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;


import sample.entity.Message;


public class PopulateMessages {

	public static void main(String[] args) {

		System.out.println("start...............");

		SessionFactory factory = new Configuration().configure().buildSessionFactory();

		Session session = factory.openSession();


		session.beginTransaction();


		Message m1 = new Message("Hibernated a message on " + new Date());

		session.save(m1);


		session.getTransaction().commit();


		session.close();

		System.out.println("end...............");

	}

}

ListMessages.java：

package sample;


import java.util.Iterator;

import java.util.List;


import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;


import sample.entity.Message;


public class ListMessages {


	public static void main(String[] args) {

		SessionFactory factory = new Configuration().configure().buildSessionFactory();

		Session session = factory.openSession();


		List<Message> messages = session.createQuery("from Message").list();

		System.out.println("Found " + messages.size() + " message(s):");


		Iterator<Message> i = messages.iterator();

		while (i.hasNext()) {

			Message msg = i.next();

			System.out.println(msg.getMessage());

		}


		session.close();

	}

}

log4j.properties:

### direct log messages to stdout ###

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.Target=System.out

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n


log4j.rootLogger=warn, stdout

log4j.logger.org.hibernate=info


### log JDBC bind parameters ###

log4j.logger.org.hibernate.type=info

log4j.logger.org.hibernate.tool.hbm2ddl=debug

hibernate.cfg.xml:

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE hibernate-configuration

  PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"

  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">


<hibernate-configuration>

<session-factory>

	<property name="hibernate.connection.url">

		jdbc:mysql://localhost/hibernate_test

	</property>

	<property name="hibernate.connection.driver_class">

		com.mysql.jdbc.Driver

	</property>

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

	<property name="hibernate.connection.password">root</property>

	<property name="hibernate.connection.pool_size">0</property>

	<property name="hibernate.dialect">

		org.hibernate.dialect.MySQLDialect

	</property>


	<!-- You will usually want to set this to true while debugging Hibernate queries -->

	<property name="hibernate.show_sql">true</property>


	<!-- "Import" the mapping resources here -->

	<mapping resource="sample/entity/Message.hbm.xml" />


</session-factory>

</hibernate-configuration>