xml声明式事务控制

1、applicationContext.xml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"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.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">

    <!--组件扫描 -->
    <context:component-scan base-package="com.itheima"/>

    <!--加载properties文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--配置数据源信息-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!--配置SqlSessionFactoryBean，作用将SqlSessionFactory存储到spring容器-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--MapperScannerConfigurer，作用扫描指定的包，产生Mapper对象存到spring容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.itheima.mapper"></property>
    </bean>

    <!--配置平台事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置spring提供好的advice-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!--
                配置不同的方法的事务属性
                name：方法名称 *代表通配符  添加操作addUser、addAccount =>add*
                isolation: 事务的隔离级别，解决事务并发问题
                timeout: 超时时间 默认-1永不超时 单位是秒
                read-only: 是否只读
                propagation：事务的传播行为，解决业务方法调用业务方法（事务嵌套问题） 默认 REQUIRED(默认值)
            -->
            <tx:method name="*" isolation="READ_COMMITTED" timeout="3" read-only="true" propagation="MANDATORY"/>
        </tx:attributes>
    </tx:advice>

    <!--事务增强aop-->
    <aop:config>
        <!--配置切点表达式-->
        <aop:pointcut id="txPointcut" expression="execution(* com.itheima.service.impl.*.*(..))"/>
        <!--配置织入关系 通知advice-ref引入spring提供好的-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
    </aop:config>

</beans>

2.、spring事务控制，注解声明式事务控制

<!--事务的自动代理(注解驱动）-->
<tx:annotation-driven/>

@Service("accountService")
@Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.REQUIRED)
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountMapper accountMapper;

    @Override
    @Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.REQUIRED)
    public void transferMoney(String outAccount, String inAccount, Integer money) {
        accountMapper.incrMoney(outAccount, money);
        accountMapper.decrMoney(inAccount, money);
    }
}