Spring中 使用注解+c3p0+事物 《模拟银行转账》

　　使用注解的方式  模拟转账 要么都成功 要么都失败 ！保持一致性！

准备工作：

　　　　jar包： 

　　　　　　　　

　　　　

　　需要的类：

　　　　      　　

　　　　　　

　　　UserDao：　

　　　　　　

1. package com.hxzy.spring.c3p0.Dao;
   
   import lombok.Data;
   import org.springframework.jdbc.core.JdbcTemplate;
   import org.springframework.stereotype.Controller;
   import org.springframework.transaction.annotation.Transactional;
   
   import javax.annotation.Resource;
   @Transactional  //开启事务
   @Data  //生成set get
   @Controller("userDao") //配置 加入ioc容器
   public class UserDao {
       @Resource(name = "jdbcTemplate")
       private JdbcTemplate template;
   
       public void test_c3(){
           String sql = "UPDATE  user_all SET u_balance = u_balance-5 WHERE uid = 1";
         //  int a = 100/0;
           String sql1 = "UPDATE  user_all SET u_balance = u_balance+5 WHERE uid = 2";
           template.update(sql);
           template.update(sql1);
       }
   }

　　UserService：

　　　　

1. package com.hxzy.spring.c3p0.Service;
   
   import com.hxzy.spring.c3p0.Dao.UserDao;
   import lombok.Data;
   import org.springframework.stereotype.Service;
   
   import javax.annotation.Resource;
   
   @Data
   @Service("userService")
   public class UserService {
       @Resource(name = "userDao")
       private UserDao userDao ;
       public void  test_(){
           userDao.test_c3();
       }
   }

　　Test测试类：

　　　　

 package test;

 import com.hxzy.spring.c3p0.Service.UserService;

 import org.springframework.context.ApplicationContext;

 import org.springframework.context.support.ClassPathXmlApplicationContext;

 public class Test {

     public static void main(String[] args) {

         ApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml");

        UserService service =  (UserService) context.getBean("userService");

        service.test_();

     }

 }

　　　spring-config.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:tx="http://www.springframework.org/schema/tx"

        xmlns:context="http://www.springframework.org/schema/context"

        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

         <!--============创建c3p0链接池=========-->

         <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">

             <property name="driverClass" value="com.mysql.jdbc.Driver"></property>

             <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/user_transfer"></property>

             <property name="user" value="root"></property>

             <property name="password" value="gubin"></property>

         </bean>

         <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">

             <property name="dataSource" ref="dataSource"></property>

         </bean>

         <!--============创建事务==============-->

         <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

                 <property name="dataSource" ref="dataSource"></property>

         </bean>

         <!--开启对事物的支持-->

         <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

         <!--============开启扫包==========-->

         <context:component-scan base-package="com.hxzy.spring"></context:component-scan>

 </beans>

　　数据库：