Spring+Hibernate如何配置多个数据库？

主要是配置文件上，希望能给两个数据库分别建立表所对应的实体，具体应该怎么操作，最好能给个demo，拜托大神回答。。

两张表配置一对多关系吗？

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"><!-- 49 -->
    <property name="driverClass" value="${jdbc.driverClass}"/>
    <property name="jdbcUrl" value="${jdbc.url}"/>
    <property name="user" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
    <property name="minPoolSize" value="${c3p0.minPoolSize}"/>
    <property name="maxPoolSize" value="${c3p0.maxPoolSize}"/>
    <property name="initialPoolSize" value="${c3p0.initialPoolSize}"/>
    <property name="testConnectionOnCheckin" value="false"/>
    <property name="testConnectionOnCheckout" value="true"/>
    <property name="preferredTestQuery" value="SELECT 1"/>
</bean>

    <bean id="dataSourceSecond" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
    <property name="driverClass" value="${jdbc.driverClass2}"/>
    <property name="jdbcUrl" value="${jdbc.url2}"/>
    <property name="user" value="${jdbc.username2}"/>
    <property name="password" value="${jdbc.password2}"/>
    <property name="minPoolSize" value="${c3p0.minPoolSize2}"/>
    <property name="maxPoolSize" value="${c3p0.maxPoolSize2}"/>
    <property name="initialPoolSize" value="${c3p0.initialPoolSize2}"/>
    <property name="testConnectionOnCheckin" value="false"/>
    <property name="testConnectionOnCheckout" value="true"/>
    <property name="preferredTestQuery" value="SELECT 1"/>
</bean>