我将Spring 3.1.2和Hibernate 4.1.7用于我的Web应用程序。我现在要配置这两个。我有我的hibernate.cfg.xml档案：

<hibernate-configuration>
    <session-factory>
        <property name="connection.url">jdbc:mysql://localhost:3306/test</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.pool_size">10</property>
        <property name="hibernate.connection.autocommit">false</property>
        <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        <!-- 
        <property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
         -->
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">update</property>       
    </session-factory>
</hibernate-configuration>

我的webapp-servlet.xmlspring配置文件：

<beans>
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="configLocation">
        <value>
            classpath:hibernate.cfg.xml
        </value>
    </property>
    <property name = "dataSource" ref = "dataSource"></property>
</bean>

<bean id = "dataSource" class = "org.apache.commons.dbcp.BasicDataSource">
    <property name = "driverClassName" value = "com.mysql.jdbc.Driver" />
    <property name = "url" value = "jdbc:mysql://localhost:3306/test" />
    <property name = "username" value = "root" />
    <property name = "password" value = "root" />
    <property name = "maxActive" value = "10" />
</bean>
</beans>

1. 当所有需要的数据都已包含在hibernate配置文件中时，为什么需要配置DataSource bean？Hibernate是否有一些可以使用的默认值？
2. 什么是一些其他DataSource的I可以使用吗？
3. 我是否缺少任何其他bean或配置参数/属性来使hibernate与我的应用程序一起工作？