hibernate的介绍以及使用hibernate操作数据库

<hibernate-configuration>
	<session-factory name="foo">
 
		<property name="hibernate.dialect"><![CDATA[org.hibernate.dialect.MySQLDialect]]></property>
		<property name="hibernate.connection.driver_class"><![CDATA[com.mysql.jdbc.Driver]]></property>
		<property name="hibernate.connection.url"><![CDATA[jdbc:mysql:///hibernate1]]></property>
		<property name="hibernate.connection.username"><![CDATA[root]]></property>
		<property name="hibernate.connection.password"><![CDATA[root]]></property>
		<!-- 是否显示sql语句 -->
		<property name="show_sql">true</property>
		<!--是否格式化sql语句-->
		<property name="format_sql">true</property>
		<!--生成表的策略,通常是update-->
		<property name="hbm2ddl.auto">update</property>
		<!--添加映射文件-->
		<mapping resource="cn/xxx/User.hbm.xml"/>
 
	</session-factory>
</hibernate-configuration>
	</property>

<hibernate-mapping>
    <class name="cn.jbit.houserent.bean.User" table="users" schema="jbit">
		<!--id 主键,column是数据表中对应的列名 -->
        <id name="id" type="java.lang.Long">
            <column name="id" />
            <generator class="native" /><!-- 主键的增长策略 -->
        </id>
		<!--type:该属性对应的类型,该类型可分为Hibernate类型与java类型-->
        <property name="password" type="java.lang.String" lazy="false">
            <column name="password" length="50" not-null="true" />
        </property>
        <property name="telephone" type="java.lang.String" lazy="false">
            <column name="telephone" length="12" />
        </property>
        <property name="username" type="java.lang.String" lazy="false">
            <column name="username" length="50" />
        </property>
    </class>
</hibernate-mapping>

public class User implements java.io.Serializable {
    //字段
    private Integer id;
    private String name;
    private String password;
    private String telephone;
    private String username;
    private String isadmin;
    public User(){
    }
    //省略getter&setter 方法
}

<hibernate-mapping>
    <class name="com.hibernate.bean.UserBean" table="users">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="sequence" >
                <param name="sequence">SEQ_ID</param>
            </generator>
        </id>
        <property name="name" type="java.lang.String">
            <column name="name" length="50" />
        </property>
        <property name="password" type="java.lang.String">
            <column name="password" length="50" />
        </property>
        <!--省略其他配置-->
    </class>
</hibernate-mapping>

<session-factory>
    <!--省略其他配置-->
    <!--注意配置文件名必须包含其相对于classpath 的全路径-->
    <mapping resource="com/hibernate/bean/User.hbm.xml" />
</session-factory>

public class HibernateUtils {
 
	private static SessionFactory factory;
	static{
		factory = new Configuration()//
		//这种方式需要注意,hibernate的配置文件名必须是hibernate.hbm.xml,
		//且必须放classpath目录下
				.configure()//
				.buildSessionFactory();
		//new Configuration().configure(xxx)可以指定配置文件的路径，配置文件可以随意放
	}
	public static SessionFactory getSessionFactory(){
		return factory;
	}
	public static Session openSession(){
		return factory.openSession();
	}
 
}

public class SessionfatoryTest {
 
	@Before
	public void init(){
		SessionFactory factory =  HibernateUtils.getSessionFactory();
	}
	@Test
	public void test(){
		
	}
}

public class SessionfatoryTest {
	SessionFactory factory;
	Session session ;
	Transaction transaction;
	@Before
	public void init(){
		factory =  HibernateUtils.getSessionFactory();
		session = factory.openSession();
		transaction = session.beginTransaction();
	}
	@Test
	public void test(){
		User user = new User();
		user.setAge(10);
		user.setName("A");
		session.save(user);
	}
	
	@After
	public void destory(){
		transaction.commit();
		session.close();
		
	}
}