ssh框架连不同的数据库配置

在配置文件applicationContext.xml设置如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<!-- 连接MySQL-->
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/mytest"></property>
<property name="username" value="root"></property>
<property name="password" value="root"></property>

<!-- 连接Oracle
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
<property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"></property>
<property name="username" value="scott"></property>
<property name="password" value="tiger"></property>
-->
<!-- 连接SQL Server
<property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"></property>
<property name="url" value="jdbc:sqlserver://localhost:1433;databaseName=test"></property>
<property name="username" value="sa"></property>
<property name="password" value="yuji"></property>
-->
<property name="maxActive" value="100"></property>
<property name="maxIdle" value="30"></property>
<property name="maxWait" value="500"></property>
<property name="defaultAutoCommit" value="true"></property>
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="hibernateProperties">
<props>
<!-- MySQL的方言-->
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>

<!-- Oracle的方言
<prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>
-->
<!-- SQL Server的方言
<prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
-->
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>com/test/bean/User.hbm.xml</value>
</list>
</property>
</bean>

<bean id="userDao" class="com.test.dao.impl.UserDAOImpl" scope="singleton">
<property name="sessionFactory">
<ref bean="sessionFactory"/>
</property>
</bean>

<bean id="userService" class="com.test.service.impl.UserServiceImpl">
<property name="userDao" ref="userDao"></property>
</bean>

<bean id="saveUserAction" class="com.test.action.user.SaveUserAction" scope="prototype">
<property name="service" ref="userService"></property>
</bean>

<bean id="listUserAction" class="com.test.action.user.ListUserAction" scope="prototype">
<property name="service" ref="userService"></property>
</bean>

<bean id="removeUserAction" class="com.test.action.user.RemoveUserAction" scope="prototype">
<property name="service" ref="userService"></property>
</bean>

</beans>