Spring事务-简介

改了的目录(需结合上文)



需加入的依赖

       <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.9.5</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.5</version>
        </dependency>

AccountService.java

package org.javaboy.jdbc;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * @author 邓雪松 (づ￣ 3￣)づ)
 * @create 2021-10-29-20-28
 */
@Service
public class AccountService {
    //转账的方法
    @Autowired
    JdbcTemplate jdbcTemplate;
    @Transactional
    public void updateMoney(){
        jdbcTemplate.update("update account set money=money-500 where username=?","zhangsan");
        int i = 1 / 0;//这里会出错但是数据库中的金额也会变化:张三会少500
        jdbcTemplate.update("update account set money=money+500 where username=?","lisi");

    }
}

jdbcTest.java

package org.javaboy.jdbc;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

/**
 * @author 邓雪松 (づ￣ 3￣)づ)
 * @create 2021-10-28-21-35
 */
public class JdbcTest {
    JdbcTemplate jdbcTemplate;
    private AccountService accountService;
    @Before
    public void before(){
//        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(JavaConfig.class);
        //xml的话是下边的
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        jdbcTemplate = ctx.getBean(JdbcTemplate.class);
        accountService = ctx.getBean(AccountService.class);
    }
    //事务
    @Test
    public void test5(){
        accountService.updateMoney();
    }
}

applicationContext.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:aop="http://www.springframework.org/schema/aop"
       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/aop https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <!--配置包扫描因为要扫AccountService-->
    <context:component-scan base-package="org.javaboy.jdbc"/>
    <!--用xml的方式配置JDBCTemplate-->
    <bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" id="dataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql:///test01?serverTimezone=Asia/Shanghai"/>
        <property name="username" value="root"/>
        <property name="password" value="121803"/>
    </bean>

    <bean class="org.springframework.jdbc.core.JdbcTemplate" id="jdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--xml中配置事务有3个步骤-->
    <!--1.配置事务管理器-->
    <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="transactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <tx:annotation-driven/>
    <!--&lt;!&ndash;2.配置事务要处理的方法&ndash;&gt;-->
    <!--<tx:advice id="txAdvice" transaction-manager="transactionManager">-->
        <!--<tx:attributes>-->
            <!--<tx:method name="update*"/>-->
            <!--<tx:method name="add*"/>-->
            <!--<tx:method name="insert"/>-->
            <!--<tx:method name="delete"/>-->
        <!--</tx:attributes>-->
    <!--</tx:advice>-->
    <!--&lt;!&ndash;第三步:配置AOP&ndash;&gt;-->
    <!--<aop:config>-->
        <!--<aop:pointcut id="pc1" expression="execution(* org.javaboy.jdbc.AccountService.*(..))"/>-->
        <!--<aop:advisor advice-ref="txAdvice" pointcut-ref="pc1"/>-->
    <!--</aop:config>-->
</beans>

javaConfig.java

package org.javaboy.jdbc;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

import javax.sql.DataSource;

/**
 * @author 邓雪松 (づ￣ 3￣)づ)
 * @create 2021-10-28-21-20
 * 这个类配置数据库的信息
 */
@Configuration
@ComponentScan
public class JavaConfig {
    @Bean
    DataSource dataSource(){
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql:///test01?serverTimezone=Asia/Shanghai");
        dataSource.setUsername("root");
        dataSource.setPassword("121803");
        return dataSource;
    }
    @Bean
    JdbcTemplate jdbcTemplate(){
        return new JdbcTemplate(dataSource());
    }
}

这样当测试test5的时候不会以为除数为0的错误而导致转账的时候->zhangsan金额会加500而lisi的金额不变的情况
应该是出错时都不变，实现回滚~

完 ~