Java框架spring 学习笔记（十六）：c3p0连接池的配置以及dao使用jdbcTemplate

连接池可以大大提高数据库的性能和连接速度，将那些已连接的数据库连接存放在一个连接池里，以后别人要连接数据库的时候，将不会重新建立数据库连接，直接从连接池中取出可用的连接，用户使用完毕后，会释放连接重新放到连接池中。

下载必要jar包mchange-commons-java-0.2.14.jar和c3p0-0.9.2.1.jar

快捷键ctrl+alt+shift+s导入jar包

编写UserDao.java

 package com.jdbc.c3p0;
 import org.springframework.jdbc.core.JdbcTemplate;

 public class UserDao {
     private JdbcTemplate jdbcTemplate;
     public void setJdbcTemplate(JdbcTemplate jdbcTemplate){
         this.jdbcTemplate = jdbcTemplate;
     }

     public void add(){
         //创建jdbcTemplate对象
         //JdbcTemplate jdbcTemplate = new JdbcTemplate();
         String sql = "insert into user values(?,?)";
         jdbcTemplate.update(sql,"Lilei","bbbbbb");
     }
 }

编写UserService.java

 package com.jdbc.c3p0;

 public class UserService {
     private UserDao userDao;
     public void setUserDao(UserDao userDao){
         this.userDao = userDao;
     }

     public void add(){
         userDao.add();
     }
 }

编写配置文件bean.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:context="http://www.springframework.org/schema/context"
        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
             http://www.springframework.org/schema/context
             http://www.springframework.org/schema/context/spring-context.xsd
             http://www.springframework.org/schema/tx
             http://www.springframework.org/schema/tx/spring-tx.xsd
             http://www.springframework.org/schema/aop
             http://www.springframework.org/schema/aop/spring-aop.xsd ">

     <!-- 配置c3p0连接池 -->
     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
         <!-- 注入dao对象 -->
         <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
         <property name="jdbcUrl" value="jdbc:mysql:///test"></property>
         <property name="user" value="root"></property>
         <property name="password" value="xxxxx"></property>
     </bean>

     <bean id="userService" class="com.jdbc.c3p0.UserService">
         <property name="userDao" ref="userDao"></property>
     </bean>
     <bean id="userDao" class="com.jdbc.c3p0.UserDao">
         <!-- 注入jdbcTemplate对象-->
         <property name="jdbcTemplate" ref="jdbcTemplate"></property>
     </bean>

     <!-- 创建jdbcTemplate对象 -->
     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
         <!-- 把dataSource传递到模板对象中-->
         <property name="dataSource" ref="dataSource"></property>
     </bean>
 </beans>

编写测试文件TestService.java

 package com.jdbc.c3p0;

 import org.junit.Test;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;

 public class TestService {
     @Test
     public void testDemo(){
         ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
         UserService userService = (UserService) context.getBean("userService");
         userService.add();
     }
 }

运行可见添加一条记录