事务管理的小案例

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创建数据库：

create database transaction1;use transaction1;create table account(id int primary key auto_increment,username varchar(30),money int);insert into account(username,money) values('fly',80);insert into account(username,money) values('wang',100);

导入jar包

-   核心：4+1-   aop ： 4 (aop联盟、spring aop、aspectj规范、spring aspect)-   数据库：2  （jdbc/tx）-   驱动：mysql-   连接池：c3p0

这里写图片描述

创建DAO：

package com.fly.transaction.dao;public interface AccountDao {    void out(String user,int money);    void in(String user,int money);}

package com.fly.transaction.dao;import org.springframework.jdbc.core.support.JdbcDaoSupport;public class TransactionDao extends JdbcDaoSupport implements AccountDao{    @Override    public void out(String user, int money) {        this.getJdbcTemplate().update("update account set money = money - ? where username = ?", money,user);    }    @Override    public void in(String user, int money) {        this.getJdbcTemplate().update("update account set money = money + ? where username = ?", money,user);    }}

创建Service:

package com.fly.transaction.service;public interface TransactionService {    void transfer(String outer, String inner, int money);}

package com.fly.transaction.service;import com.fly.transaction.dao.TransactionDao;public class TransactionServiceImp implements TransactionService {    private TransactionDao dao;    public void setTransactionDao(TransactionDao dao) {        this.dao = dao;    }    @Override    public void transfer(String outer, String inner, int money) {        dao.out(outer, money);        dao.in(inner, money);    }}

配置文件applicationContext:

<?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:context="http://www.springframework.org/schema/context"       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                           http://www.springframework.org/schema/context                            http://www.springframework.org/schema/context/spring-context.xsd">    <!-- 1 datasource -->    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/transaction1"></property>        <property name="user" value="root"></property>        <property name="password" value="123"></property>    </bean>    <!--  这里注意id不能乱写，最好写TransactionDao首字母小写即transactionDao  -->    <bean id="transactionDao" class="com.fly.transaction.dao.TransactionDao">        <property name="dataSource" ref="dataSource"></property>    </bean>    <!-- 3 service -->    <bean id="accountService" class="com.fly.transaction.service.TransactionServiceImp">        <property name="transactionDao" ref="transactionDao"></property>    </bean></beans>

测试类：

package com.fly.transaction.test;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.fly.transaction.service.TransactionServiceImp;public class TestDemo {    @Test    public void test(){        String xmlPath  = "appcationContext.xml";        ApplicationContext context = new ClassPathXmlApplicationContext(xmlPath);        TransactionServiceImp bean = (TransactionServiceImp) context.getBean("accountService");        bean.transfer("fly", "wang", 10);    }}

工厂bean 生成代理：半自动

spring提供管理事务的代理工厂bean TransactionProxyFactoryBean
1.getBean() 获得代理对象
2.spring 配置一个代理

spring配置

<?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:context="http://www.springframework.org/schema/context"       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                           http://www.springframework.org/schema/context                            http://www.springframework.org/schema/context/spring-context.xsd">    <!-- 1 datasource -->    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/transaction1"></property>        <property name="user" value="root"></property>        <property name="password" value="123"></property>    </bean>    <!-- 2 dao  -->    <bean id="transactionDao" class="com.fly.transaction.dao.TransactionDao">        <property name="dataSource" ref="dataSource"></property>    </bean>    <!-- 4 service 代理对象         4.1 proxyInterfaces 接口         4.2 target 目标类        4.3 transactionManager 事务管理器        4.4 transactionAttributes 事务属性（事务详情）            prop.key ：确定哪些方法使用当前事务配置            prop.text:用于配置事务详情                格式：PROPAGATION,ISOLATION,readOnly,-Exception,+Exception                    传播行为        隔离级别    是否只读        异常回滚        异常提交                例如：                    <prop key="transfer">PROPAGATION_REQUIRED,ISOLATION_DEFAULT</prop> 默认传播行为，和隔离级别                    <prop key="transfer">PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly</prop> 只读                    <prop key="transfer">PROPAGATION_REQUIRED,ISOLATION_DEFAULT,+java.lang.ArithmeticException</prop>  有异常扔提交    -->    <!-- 3 service -->    <bean id="proxyAccountService" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">        <property name="proxyInterfaces" value="com.fly.transaction.service.TransactionService"></property>        <property name="target" ref="transactionServiceImp"></property>        <property name="transactionManager" ref="txManager"></property>        <property name="transactionAttributes">            <props>                <prop key="transfer">PROPAGATION_REQUIRED,ISOLATION_DEFAULT</prop>            </props>        </property>    </bean>    <!-- 5 事务管理器 -->    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">        <property name="dataSource" ref="dataSource"></property>    </bean>    <bean id="transactionServiceImp" class="com.fly.transaction.service.TransactionServiceImp">        <property name="transactionDao" ref="transactionDao"></property>    </bean></beans>

再次测试：

package com.fly.transaction.test;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.fly.transaction.service.TransactionService;public class TestDemo {    @Test    public void test(){        String xmlPath  = "appcationContext.xml";        ApplicationContext context = new ClassPathXmlApplicationContext(xmlPath);        // 接口        TransactionService bean = (TransactionService) context.getBean("proxyAccountService");        bean.transfer("fly", "wang", 10);    }}

AOP 配置基于xml
在spring xml 配置aop 自动生成代理，进行事务的管理
1.配置管理器
2.配置事务详情
3.配置aop

<!-- 4 事务管理 -->    <!-- 4.1 事务管理器 -->    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">        <property name="dataSource" ref="dataSource"></property>    </bean>    <!-- 4.2 事务详情（事务通知）  ， 在aop筛选基础上，对ABC三个确定使用什么样的事务。例如：AC读写、B只读 等        <tx:attributes> 用于配置事务详情（属性属性）            <tx:method name=""/> 详情具体配置                propagation 传播行为 ， REQUIRED：必须；REQUIRES_NEW:必须是新的                isolation 隔离级别    -->    <tx:advice id="txAdvice" transaction-manager="txManager">        <tx:attributes>            <tx:method name="transfer" propagation="REQUIRED" isolation="DEFAULT"/>        </tx:attributes>    </tx:advice>    <!-- 4.3 AOP编程，目标类有ABCD（4个连接点），切入点表达式 确定增强的连接器，从而获得切入点：ABC -->    <aop:config>        <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.itheima.service..*.*(..))"/>    </aop:config>

AOP配置基于注解
1.配置事务管理器，将并事务管理器交予spring
2.在目标类或目标方法添加注解即可 @Transactional

spring配置

<!-- 4 事务管理 -->    <!-- 4.1 事务管理器 -->    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">        <property name="dataSource" ref="dataSource"></property>    </bean>    <!-- 4.2 将管理器交予spring         * transaction-manager 配置事务管理器        * proxy-target-class            true ： 底层强制使用cglib 代理    -->    <tx:annotation-driven transaction-manager="txManager"/>

service 层

@Transactionalpublic class AccountServiceImpl implements AccountService {

事务详情配置
这里写图片描述

@Transactional(propagation=Propagation.REQUIRED , isolation = Isolation.DEFAULT)public class AccountServiceImpl implements AccountService {

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