利用Spring配置文件实现jdbc操作数据库(C3P0)

<?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.xsd">
    <!--配置数据库源对象-->
    <bean id="datasource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!--注入四个数据库原属性-->
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/springdemo"></property>
        <property name="user" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

    <!--通过queryRunner注入datasource对象-->
    <bean id="QueryRunner" class="org.apache.commons.dbutils.QueryRunner">
        <constructor-arg name="ds" ref="datasource"></constructor-arg>
    </bean>

    <!--注入queryRunner-->
    <bean id="AccountDao" class="com.itheima.dao.impl.AccountDaoImpl">
        <property name="queryRunner" ref="QueryRunner"></property>
    </bean>
    <!--注入accountDao-->
    <bean id="AccountService" class="com.itheima.service.impl.AccountServiceImpl">
        <property name="accountDao" ref="AccountDao"></property>
    </bean>

</beans>