1 Spring 事务编程概述

PlatformTransactionManager +TransactionDefinition = TransactionStatus

2 搭建环境

• 数据库准备一个账户表tb account;

• dao层准备一个AccountMapper，包括incrMoney和decrMoney两个方法;service层准备一个transferMoney方法，分别调用incrMoney和decrMoney方法

• 在applicationContext文件中进行Bean的管理配置

• 测试正常转账与异常转账

数据库

CREATE TABLE `tb_accout` (
  `id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT '主键自增',
  `account_name` VARCHAR(32) COMMENT '账户名称',
  money INT COMMENT '金额'
);

INSERT INTO tb_accout(account_name,money) VALUE('tom',5000);
INSERT INTO tb_accout(account_name,money) VALUE('lucy',5000);

mapper

/**
 * @author : msf
 * @date : 2023/1/28
 */
@Mapper
public interface AccountMapper {
    void incrMoney(@Param("accountName") String accountName, @Param("money")Integer money);

    void decrMoney(@Param("accountName") String accountName, @Param("money")Integer money);
}

Service

public interface AccountService {
    void transferMoney(String outAccount, String inAccount, Integer money);
}

@Service("accountService")
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountMapper accountMapper;

    @Override
    public void transferMoney(String outAccount, String inAccount, Integer money) {
        accountMapper.decrMoney(outAccount,money);
        accountMapper.incrMoney(inAccount,money);
    }
}

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: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/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd
       ">

    <!--注解组件扫描：扫描指定的基本包及其子包下的类，识别使用@Component注解-->
    <context:component-scan base-package="org.example"/>

    <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对象存储到Spring容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="org.example.mapper"></property>
    </bean>
</beans>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="org.example.mapper.AccountMapper">
    <update id="incrMoney">
        update tb_accout set money = money +  #{money} where account_name = #{accountName}
    </update>

    <update id="decrMoney">
        update tb_accout set money = money -  #{money} where account_name = #{accountName}
    </update>
</mapper>

结果

3 基于xml声明式事务控制

在业务层进行事务控制；

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

    <!--配置spring 提供好的advisor-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!--事务属性配置，任意方法都需要默认的事务属性-->
            <tx:method name="*"/>
        </tx:attributes>
    </tx:advice>
    
    <!--事务增强的aop-->
    <aop:config>
        <aop:pointcut id="txPointcut" expression="execution(* org.example.service..*.*(..))"/>
        <!--配置织入 spring提供好的通知-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
    </aop:config>

事务的传播行为

4 基于注解声明式事务控制

@Transaction

@EnableTransactionManagement 相当于注解扫描