Spring 的C3p0连接池是在程序第一次访问数据库时创建的

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第一次访问数据库时，相应的SERVICE BEAN的依赖于dataSource，然后由dataSource启动连接池

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??? <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
??? ??? <property name="driverClass" value="${jdbc.driverClassName}" />
??? ??? <property name="jdbcUrl" value="${jdbc.url}" />
??? ??? <property name="user" value="${jdbc.username}" />
??? ??? <property name="password" value="${jdbc.password}" />

??? ??? <property name="initialPoolSize" value="3" />
??? ??? <property name="maxPoolSize" value="30" />
??? ??? <property name="minPoolSize" value="2" />
??? ??? <property name="maxIdleTime" value="60" />
??? ??? <property name="maxStatements" value="0" />
??? ??? <property name="maxStatementsPerConnection" value="80" />

??? ??? <property name="acquireIncrement" value="1" />
??? </bean>