Hibernate框架的搭建和第一个简单的实例

Hibernate是一个支持对JDBC进行封装的框架，实现了对底层数据库访问的封装。非常适合使用和开发。首先需要下

载Hibernate，可以在这个网站下载最新包。http://www.hibernate.org/然后打开他的目录结构，将lib目录下的required目

录下的包全部导入到工程中去，这个是hibernate运行所必须的最少的包。

然后写一个Bean，将需要储存到数据库中的变量封装成Bean。为了让Hibernate识别这个bean，需要一个配置文

件，这里起名叫User.hbm.xml。先看一下User的代码和User.hbm.xml的代码

package com.bird.domain;

import java.util.Date;

public class User {

private int id;
private String name;
private Date birthday;

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 Date getBirthday() {
return birthday;
}

public void setBirthday(Date birthday) {
this.birthday = birthday;
}

}

<?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="com.bird.domain">

<class name="User">
<id name="id">
<generator class="native"/>
</id>

<property name="name"/>
<property name="birthday"/>

</class>

</hibernate-mapping>

然后需要一个Hibernate的配置文件,这个文件的例子可以再Hibenate解压目录的project里面的ect目录里面找到。更加

详细的配置选项和要求可以参考hibernate.properties.template这个文件.

<?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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql:///test</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">mysql</property>

<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.hbm2ddl.auto">update</property>

<mapping resource="com/bird/domain/User.hbm.xml"/>

</session-factory>
</hibernate-configuration>

<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>这句话的意思是指定你使用的数

据库的方言.

<property name="hibernate.hbm2ddl.auto">update</property>这句话的意思是自动创建或者更改数据库里面的表或

者表的内容结构

<mapping resource="com/bird/domain/User.hbm.xml"/>这句话的意思是要求装载这个类映射文件

下面就可以运行这个了，记住，别忘了导入Mysql的Connection的Jar包。

package com.bird.hibernate.test;

import java.util.Date;

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

import com.bird.domain.User;

public class Base {

/**
* @param args
*/
public static void main(String[] args) {
Configuration cfg = new Configuration();
cfg.configure();

@SuppressWarnings("deprecation")
SessionFactory sf = cfg.buildSessionFactory();

Session s = sf.openSession();

Transaction tx = s.beginTransaction();
User use = new User();
use.setBirthday(new Date());
use.setName("bird");

s.save(use);
tx.commit();
s.close();

}

}

运行结果如下

2012-2-28 12:12:38 org.hibernate.annotations.common.Version <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
2012-2-28 12:12:38 org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.0.1.Final}
2012-2-28 12:12:38 org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
2012-2-28 12:12:38 org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
2012-2-28 12:12:38 org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
2012-2-28 12:12:38 org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
2012-2-28 12:12:38 org.hibernate.cfg.Configuration addResource
INFO: HHH000221: Reading mappings from resource: com/bird/domain/User.hbm.xml
2012-2-28 12:12:38 org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
2012-2-28 12:12:38 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)
2012-2-28 12:12:38 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000115: Hibernate connection pool size: 20
2012-2-28 12:12:38 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000006: Autocommit mode: false
2012-2-28 12:12:38 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql:///test]
2012-2-28 12:12:38 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000046: Connection properties: {user=root, password=****}
2012-2-28 12:12:39 org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
2012-2-28 12:12:39 org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)
2012-2-28 12:12:39 org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000228: Running hbm2ddl schema update
2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000102: Fetching database metadata
2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000396: Updating schema
2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.TableMetadata <init>
INFO: HHH000261: Table found: test.user
2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.TableMetadata <init>
INFO: HHH000037: Columns: [id, birthday, name]
2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.TableMetadata <init>
INFO: HHH000108: Foreign keys: []
2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.TableMetadata <init>
INFO: HHH000126: Indexes: [primary]
2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000232: Schema update complete

这样就可以了