spring DriverManagerDataSource opens up many connections?
===

I am using spring and hibernate stand alone  application. i am using below configuration.

    <bean id="dataSource"
    		class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    		<property name="driverClassName" value="${driverClassName}" />
    		<property name="url" value="${db.url}" />
    		<property name="username" value="${db.username}" />
    		<property name="password" value="${db.password}" />
    	</bean>
    
    	<bean id="sessionFactory"
    		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    		<property name="dataSource" ref="dataSource" />
    		<property name="annotatedClasses">
    			<list>
    				<value>com.some.SomePojo</value>
    			</list>
    		</property>
    
    		<property name="hibernateProperties">
    			<props>
    				<prop key="hibernate.dialect">${mdm.db.dialect}</prop>
    								
    			</props>
    		</property>
    	</bean>
    
    	
    	<tx:annotation-driven transaction-manager="transactionManager" />
    	
    	<bean id="transactionManager"
    		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    		<property name="sessionFactory" ref="sessionFactory" />
    	</bean>

is DriverManagerDataSource opens up database connection every time data is requested? or does it reuses already opened connection? Also does it closes idle connections? to make use of connection pooling concept do i need c3p0?


Thanks!