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 logVersionINFO: HHH000412: Hibernate Core {4.0.1.Final}2012-2-28 12:12:38 org.hibernate.cfg.Environment <clinit>INFO: HHH000206: hibernate.properties not found2012-2-28 12:12:38 org.hibernate.cfg.Environment buildBytecodeProviderINFO: HHH000021: Bytecode provider name : javassist2012-2-28 12:12:38 org.hibernate.cfg.Configuration configureINFO: HHH000043: Configuring from resource: /hibernate.cfg.xml2012-2-28 12:12:38 org.hibernate.cfg.Configuration getConfigurationInputStreamINFO: HHH000040: Configuration resource: /hibernate.cfg.xml2012-2-28 12:12:38 org.hibernate.cfg.Configuration addResourceINFO: HHH000221: Reading mappings from resource: com/bird/domain/User.hbm.xml2012-2-28 12:12:38 org.hibernate.cfg.Configuration doConfigureINFO: HHH000041: Configured SessionFactory: null2012-2-28 12:12:38 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configureINFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)2012-2-28 12:12:38 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configureINFO: HHH000115: Hibernate connection pool size: 202012-2-28 12:12:38 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configureINFO: HHH000006: Autocommit mode: false2012-2-28 12:12:38 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configureINFO: 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 configureINFO: HHH000046: Connection properties: {user=root, password=****}2012-2-28 12:12:39 org.hibernate.dialect.Dialect <init>INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect2012-2-28 12:12:39 org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateServiceINFO: HHH000399: Using default transaction strategy (direct JDBC transactions)2012-2-28 12:12:39 org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>INFO: HHH000397: Using ASTQueryTranslatorFactory2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.SchemaUpdate executeINFO: HHH000228: Running hbm2ddl schema update2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.SchemaUpdate executeINFO: HHH000102: Fetching database metadata2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.SchemaUpdate executeINFO: HHH000396: Updating schema2012-2-28 12:12:39 org.hibernate.tool.hbm2ddl.TableMetadata <init>INFO: HHH000261: Table found: test.user2012-2-28 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 executeINFO: HHH000232: Schema update complete这样就可以了
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