SSH框架搭建过程---之Hibernate框架的使用（1）

Hibernate框架的使用

<span style="font-size:12px;color:#339999;"><strong><?xml version="1.0"encoding="UTF-8"?>
<!DOCTYPE hibernate-configurationPUBLIC
"-//Hibernate/HibernateConfiguration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory>

<!-- Databaseconnection settings -->
<propertyname="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/graduate</property>
<propertyname="connection.username">root</property>
<propertyname="connection.password">root</property>

<!-- SQL dialect-->
<propertyname="dialect">org.hibernate.dialect.MySQLDialect</property>

<!-- Echo allexecuted SQL to stdout -->
<propertyname="show_sql">true</property>
<propertyname="format_sql">true</property>

<mappingresource="cn/edu/bucea/domain/Demo.hbm.xml" />

</session-factory>

</hibernate-configuration></strong></span>

<span style="font-size:12px;">/**
*
*/
package cn.edu.bucea.domain;

import java.io.Serializable;

/**
* @author JJG
*
*/
public class Demo implementsSerializable {

private static final longserialVersionUID = -2072913502409092000L;

private String id;
private String name;
private String password;

public Demo() {}

/**
* @param id
* @param name
* @param password
*/
public Demo(String id, Stringname, String password) {
super();
this.id = id;
this.name = name;
this.password =password;
}

public String getId() {
return id;
}

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

public String getName() {
return name;
}

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

public String getPassword() {
return password;
}

public voidsetPassword(String password) {
this.password =password;
}

@Override
public String toString() {
return "Demo[id=" + id + ", name=" + name + ", password=" +password
+"]";
}

}</span>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/HibernateMapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

<class name="cn.edu.bucea.domain.Demo"table="DEMO">
<id name="id" type="int">
<column name="ID"/>
<generator class="identity"/>
</id>
<property name="name" type="string">
<column name="NAME"/>
</property>
<property name="password" type="string">
<column name="PASSWORD"></column>
</property>
</class>

</hibernate-mapping>

importorg.hibernate.HibernateException;
importorg.hibernate.SessionFactory;
importorg.hibernate.cfg.Configuration;

public classSessionFactoryUtil {
private static SessionFactory sessionFactory;
private static String CONFIG_FILE_LOCATION = "/cn/edu/bucea/config/hibernate.cfg.xml";

static{
try{
sessionFactory = new Configuration().configure(CONFIG_FILE_LOCATION).
buildSessionFactory();
}catch(HibernateExceptione){
System.err.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}

public static SessionFactorygetSessionFactory() {
return sessionFactory;
}

public static void main(String[]args) {
System.out.println(getSessionFactory());
}

}

/**
* @author JJG
*  用户自定义异常类
*/
public class DemoException extends Exception {

private static final long serialVersionUID = 704805066683813880L;

publicDemoException(Exception e){
super(e);
}

publicDemoException(String msg){
super(msg);
}
}

importorg.hibernate.HibernateException;
importorg.hibernate.Session;
importorg.hibernate.Transaction;
import cn.edu.bucea.domain.Demo;
importcn.edu.bucea.exception.DemoException;
importcn.edu.bucea.util.SessionFactoryUtil;

public class DemoDAO {

public DemoDAO() {
}

public void saveDemo(Demodemo) throws DemoException{
Session session= null;
Transactiontransaction = null;//注意Session和Transaction的包
try{
session =SessionFactoryUtil.getSessionFactory().openSession();
transaction= session.beginTransaction();
session.save(demo);
transaction.commit();
} catch(HibernateExceptione){
transaction.rollback();
throw newDemoException(e.getMessage());
} finally{
if (session != null){
session.close();
}
}
//...
}
}

import cn.edu.bucea.DAO.DemoDAO;
import cn.edu.bucea.domain.Demo;
import cn.edu.bucea.exception.DemoException;

/**
* @author JJG
* DemoDAO测试类
*/
public class DemoTest {

public static void testSaveDemo() throws DemoException{
Demo demo = new Demo();
demo.setId(1);
demo.setName("JJG");
demo.setPassword("123");

DemoDAO demoDAO = new DemoDAO();
demoDAO.saveDemo(demo);

}
//…

public static void main(String[] args) throws DemoException {
testSaveDemo();
//…
}

}