spring DriverManagerDataSource opens up many connections?

I am using spring and hibernate stand-alone applications. 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 a database connection every time data is requested? or does it reuses already opened connection? Also, does it close idle connections? to make use of the connection pooling concept do I need c3p0? Thanks!