spring配置c3p0连接池

Spring 配置连接池和dao使用jdbcTemplate
   1 spring配置c3p0连接池
      第一步  导入jar包
      


      第二步  创建spring配置文件，配置连接池

      （1）把代码在文件配置中进行配置

       
  

 2 dao使用jdbcTemplate
     （1）创建service和dao，配置service和dao对象，在service注入dao对象

    
具体代码：  演示一遍c3p0添加数据操作

bean3.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here --><!-- 开启c3p0连接池操作 --><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">    <!-- 注入属性值 -->    <property name="driverClass" value="com.mysql.jdbc.Driver"></property>    <property name="jdbcUrl" value="jdbc:mysql:///news"></property>    <property name="user" value="root"></property>    <property name="password" value="root"></property></bean><!-- 创建service和dao对象， 在service注入dao对象 -->    <bean id="userService" class="com.cn.c3p0.UserService">       <!-- 注入dao对象 -->       <property name="userDao" ref="userDao"></property>    </bean>     <bean id="userDao" class="com.cn.c3p0.UserDao">        <property name="jdbcTemplate" ref="jdbcTemplate"></property>     </bean>     <!-- 创建jdbcTemplate对象 -->     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">        <property name="dataSource" ref="dataSource"></property>     </bean>          </beans>

UserDao.java

package com.cn.c3p0;import org.springframework.jdbc.core.JdbcTemplate;public class UserDao {private JdbcTemplate   jdbcTemplate;//得到JdbcTemplate对象public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {this.jdbcTemplate = jdbcTemplate;}//添加操作public void add() {// TODO Auto-generated method stubString  sql="insert into my value(?,?)";jdbcTemplate.update(sql, "张悦", "520");}}

UserService.java

package com.cn.c3p0;public class UserService {private UserDao  userDao;public void setUserDao(UserDao userDao) {this.userDao = userDao;}public void add(){userDao.add();}}

TestService.java

package com.cn.c3p0;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class TestService {@Testpublic void testDemo(){ApplicationContext context=new ClassPathXmlApplicationContext("bean3.xml");UserService  service=(UserService) context.getBean("userService");service.add();}}