制作Hibernate一个HelloWorld的例子，不知道怎么弄

Nadeal 2013-01-05 10:17:43

自己看书弄了个HelloWorld，插入数据到数据库没有成功没有成功。
Mymain类代码



package helloworld;



import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;



public class MyMain{

	



	//private static String configFile="/hibernate.cfg.xml";

	private static Configuration configuration=new Configuration();

	//private static final ThreadLocal<Session> threadLocal=new ThreadLocal<Session>();

	//private static SessionFactory sessionFactory;

	

	/*static{

		try{

			configuration.configure(configFile);

			sessionFactory=configuration.buildSessionFactory();

		}catch(Exception e){

			e.printStackTrace();

		}

	}

	

	public static Session getSession(){

		Session session=(Session)threadLocal.get();

		if(session==null || !session.isOpen()){

			session=sessionFactory.openSession();

			threadLocal.set(session);

		}

		return session;

	}*/

	

	public static void main(String[] args){

		

	

	Session session=null;

	Transaction trans=null;

	

	try{

		//session=HibernateSessionFactory.getSession();

		//session=getSession();

		

		SessionFactory sf=configuration.configure().buildSessionFactory();

		session=sf.openSession();

		trans=session.beginTransaction();

		User[] users=new User[5];

		for(int i=0;i<users.length;i++){

			users[i]=new User("User"+i,"pwd");

			session.save(users[i]);

			System.out.println(i);

		}

		

		session.getTransaction().commit();

	}catch(HibernateException e){

		System.out.println("I am failed!");

		if(trans!=null)

			trans.rollback();

	}finally{

		if(session!=null)

			session.close();

	}

	}

}

实体类代码



package helloworld;



public class User {

	

	private int id;

	private String username;

	private String password;

	

	public User(){

		super();

	}

	

	public User(String username,String password){

		super();

		this.username=username;

		this.password=password;

	}



	public int getId() {

		return id;

	}



	public void setId(int id) {

		this.id = id;

	}



	public String getUsername() {

		return username;

	}



	public void setUsername(String username) {

		this.username = username;

	}



	public String getPassword() {

		return password;

	}



	public void setPassword(String password) {

		this.password = password;

	}

}

映射文件



<?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>

    <class name="User" table="users">

        <id name="id" column="id">

             <generator class="native"></generator>

        </id>

        <property name="username" unique="true" not-null="true" length="20" column="username"></property>

        <property name="password" unique="true" not-null="true" length="20" column="password"></property>

    </class>



</hibernate-mapping>

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>

        

        

        <property name="connection.url">jdbc:mysql://localhost:3306/test</property>

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

        <property name="connection.password">123456</property>

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

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

        <mapping resource="helloworld/User.hbm.xml" />

    </session-factory>

</hibernate-configuration>

运行后的信息



2013-1-5 21:59:09 org.hibernate.cfg.Environment <clinit>

信息: Hibernate 3.2.5

2013-1-5 21:59:09 org.hibernate.cfg.Environment <clinit>

信息: hibernate.properties not found

2013-1-5 21:59:09 org.hibernate.cfg.Environment buildBytecodeProvider

信息: Bytecode provider name : cglib

2013-1-5 21:59:09 org.hibernate.cfg.Environment <clinit>

信息: using JDK 1.4 java.sql.Timestamp handling

2013-1-5 21:59:09 org.hibernate.cfg.Configuration configure

信息: configuring from resource: /hibernate.cfg.xml

2013-1-5 21:59:09 org.hibernate.cfg.Configuration getConfigurationInputStream

信息: Configuration resource: /hibernate.cfg.xml

2013-1-5 21:59:09 org.hibernate.cfg.Configuration addResource

信息: Reading mappings from resource : helloworld/User.hbm.xml

2013-1-5 21:59:09 org.hibernate.cfg.HbmBinder bindRootPersistentClassCommonValues

信息: Mapping class: User -> users

I am failed!

其实都是看书，敲出来的代码。求解，怎么插入数据呢

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失落夏天 2013-01-06

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给你发一个最基础的例子吧。你的例子我就不看了。你照着我的对对。形式差不多的一个例子

package com.briup.hibernate.basic;

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

import com.briup.hibernate.pojo.Student;


public class FirstHibernate {
	public static void main(String[] args) {	
		//1.使用configuration初始化hibernate读取配置文件
		Configuration config=new Configuration();
		config.configure();//默认加载hibernate.cfg.xml的配置文件
		//config.configure("hibernate.cfg.xml");//配置文件自定义配置
		//2构建sessionfactory
		SessionFactory fac=config.buildSessionFactory();
		
		//3生成session
		//session是一个接口，openSession实现的接口的对象
		Session session=fac.openSession();//使用默认session
		Session session2=fac.getCurrentSession();
		
		//System.out.println(session2);
		//4.开始事务
		Student s=new Student();
		s.setId(1);
		s.setName("briup");
		s.setAddress("briup");
		s.setAge(12); 
		Transaction tr=session.beginTransaction();
		session.save(s);//提交操作s
		//save delete update
		
		tr.commit();
		session.close();	
	}
}

package com.briup.hibernate.pojo;

import java.io.Serializable;

import javax.persistence.Column;

import org.hibernate.annotations.Entity;


public class Student implements Serializable{

	private Long id;
	private String name;
	private String address;
	private int age;
	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;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Student(long id, String name, String address, int age) {
		super();
		this.id = id;
		this.name = name;
		this.address = address;
		this.age = age;
	}
	public Student() {
		super();
		// TODO Auto-generated constructor stub
	}
	@Override
	public String toString() {
		return "Student [id=" + id + ", name=" + name + ", address=" + address
				+ ", age=" + age + "]";
	}
	
}

配置文件： student.hbm.xml


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

<hibernate-mapping package="com.briup.hibernate.pojo" >
	<class name="Student"  table="student" >
		<id name="id" column="id">
		</id>
		<property name="name" column="name"></property>
		<property name="address" column="address"></property>
		<property name="age" column="age"></property>
	</class>
</hibernate-mapping>

注意账户名密码以及数据库url别复制


<?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>
		<property name="dialect">
			org.hibernate.dialect.Oracle10gDialect
		</property>
		<property name="connection.url">
			jdbc:oracle:thin:@127.0.0.1:1521:xe
		</property>
		<property name="connection.username">briup</property>
		<property name="connection.password">briup</property>
		<property name="connection.driver_class">
			oracle.jdbc.driver.OracleDriver
		</property>
		<property name="show_sql">true</property><!-- 鏄剧ずsql璇彞-->
		<property name="format_sql">true</property>
		<property name="hbm2ddl.auto">update</property>
		<property name="current_session_context_class">thread</property>
		
		<mapping resource="com/briup/hibernate/pojo/Student.hbm.xml	</session-factory>
</hibernate-configuration>

Nadeal 2013-01-06