求问 springmvc+hibernate 怎么样配置多个数据库，使用时怎么注入？？

现在链接一个数据库是这样配置的：

hibernate.cfg.xml配置：

<?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">

<!-- Generated by MyEclipse Hibernate Tools.                   -->

<hibernate-configuration>



	<session-factory>

		<property name="hbm2ddl.auto">update</property>

		<property name="dialect">

			org.hibernate.dialect.MySQLDialect

		</property>

		<property name="connection.url">

			jdbc:mysql://localhost:3306/mydb

		</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="myeclipse.connection.profile">

			localhost_mysql_mydb

		</property>

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

		<mapping resource="com/pojo/Rolegroup.hbm.xml" />

		<mapping resource="com/pojo/Menu.hbm.xml" />

		<mapping resource="com/pojo/Role.hbm.xml" />

	</session-factory>



</hibernate-configuration>

Spring配置springmvc-servlet.xml：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"  

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"  

    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"  

    xsi:schemaLocation="  

         http://www.springframework.org/schema/beans  

         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  

         http://www.springframework.org/schema/context  

         http://www.springframework.org/schema/context/spring-context-3.0.xsd  

         http://www.springframework.org/schema/aop    

         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd    

         http://www.springframework.org/schema/tx    

         http://www.springframework.org/schema/tx/spring-tx.xsd">  

	

    <context:component-scan base-package="com.controller,com.dao,com.service" /> 

    

    <bean id="sessionFactory"

		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

		<property name="configLocation"

			value="classpath:hibernate.cfg.xml">

		</property>

	</bean> 

	<bean id="transactionManager"

	  class="org.springframework.orm.hibernate3.HibernateTransactionManager">

      <property name="sessionFactory"  ref="sessionFactory"/>

    </bean>

     <tx:annotation-driven transaction-manager="transactionManager"  />

     

	<!-- 配置视图解析器 -->

	<bean id="viewResolver"

		class="org.springframework.web.servlet.view.InternalResourceViewResolver">

		<property name="prefix" value="/" />

		<property name="suffix" value=".jsp" />

	</bean>

</beans>

现在想要配置两个数据库，都是MySQL的数据库。怎么样配置？？sessionFactory又要用？？

刚开始学，觉得好难，有没有人帮忙看下~~