【例】模拟银行转账
数据表结构
accountNo:表示账号
balance:表示余额
初始余额都为1000
一、创建相关类
AccountBiz类
package com.tx;
public class AccountBiz {
private AccountDao accountDao;
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
//银行转账
public void transfer(){
accountDao.transfer();
}
}
AccountDao类
package com.tx;
import org.springframework.jdbc.core.JdbcTemplate;
public class AccountDao {
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
//银行转账
public void transfer(){
add();
reduce();
}
//增加余额
public void add(){
String sql="update account set balance=balance+? where accountNo=?";
jdbcTemplate.update(sql, 500,655925);
}
//减少余额
public void reduce(){
String sql="update account set balance=balance-? where accountNo=?";
jdbcTemplate.update(sql, 500,358788);
}
}
Test类
package com.tx;
import java.util.List;
import java.util.Map;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;
public class Test {
public static void main(String[] args) {
//加载配置spring-jdbcTemplate.xml
ApplicationContext context=new ClassPathXmlApplicationContext("Spring-tx.xml");
//获取jdbcTemplate实例
JdbcTemplate jdbcTemplate=context.getBean(JdbcTemplate.class);
//获取accountBiz实例
AccountBiz accountBiz=(AccountBiz) context.getBean("accountBiz");
//银行转账
accountBiz.transfer();
}
}
二、配置Spring-tx.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"
xmlns:tx="http://www.springframework.org/schema/tx" 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/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here -->
<!-- 配置数据源 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql:///spring_demo"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</bean>
<!-- 配置JdbcTemplate -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 配置实体类 -->
<bean id="accountBiz" class="com.tx.AccountBiz">
<property name="accountDao" ref="accountDao"></property>
</bean>
<bean id="accountDao" class="com.tx.AccountDao">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<tx:advice id="advice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<!-- 配置AOP -->
<aop:config>
<aop:pointcut expression="execution(* com.tx.AccountBiz.transfer(..))" id="pointcut"/>
<aop:advisor advice-ref="advice" pointcut-ref="pointcut"/>
</aop:config>
</beans>
测试正常转账
测试转账失败
注意:在AccountDao类的transfer方法抛出异常
//银行转账
public void transfer(){
add();
int i=10/0;
reduce();
}
运行结果: