springcloud alibaba seat springcloud alibaba seata集成

seata

• 1.Seata简介
• 2.Seata-Server安装

• 2.1 file.conf文件修改
• 2.2 mysql新建库seata
• 2.3修改seata\conf目录下的registry.conf配置文件
• 2.4 启动

• 3.对seata的@GlobalTransactional事务进行测试

• 3.1新建数据库

• 3.1.3 三库分别建对应的回滚日志表

• 3.2相同模块

• 3.2.1pom
• 3.2.2 DataSourceProxyConfig
• 3.2.3 MyBatisConfig
• 3.2.4 file.conf 和 registry.confq

• 3.2 新建订单seata-order-service8001
• 3.3 新建账户seata-account-service8002
• 3.4 新建库存seata-storage-service8003
• 3.5添加全局回滚@GlobalTransactional
• 3.6启动测试

• 4.seata事务原理

1.Seata简介

Seata是一款开源的分布式事务解决方案，致力于在微服务架构下提供高性能和简单易用的分布式事务服务

一个典型的分布式事务过程：分布式事务处理过程的-ID+三组件模型
       Transaction ID XID ：全局唯一的事务ID
       Transaction Coordinator(TC) ：事务协调器，维护全局事务的运行状态，负责协调并驱动全局事务的提交或回滚;
       Transaction  Manager(TM) ：控制全局事务的边界，负责开启一个全局事务，并最终发起全局提交或全局回滚的决议;
       Resource Manager(RM) ：控制分支事务，负责分支注册，状态汇报，并接收事务协调器的指令，驱动分支（本地）事务的提交和回滚；

过程：

Spring 本地@Transactional
全局@GlobalTransactional

2.Seata-Server安装

seata下载地址

2.1 file.conf文件修改

主要修改：自定义事务组名称+事务日志存储模式为db+数据库连接信息

2.2 mysql新建库seata

seata\conf目录里面db_store.sql

-- the table to store GlobalSession data
drop table if exists `global_table`;
create table `global_table` (
  `xid` varchar(128)  not null,
  `transaction_id` bigint,
  `status` tinyint not null,
  `application_id` varchar(32),
  `transaction_service_group` varchar(32),
  `transaction_name` varchar(128),
  `timeout` int,
  `begin_time` bigint,
  `application_data` varchar(2000),
  `gmt_create` datetime,
  `gmt_modified` datetime,
  primary key (`xid`),
  key `idx_gmt_modified_status` (`gmt_modified`, `status`),
  key `idx_transaction_id` (`transaction_id`)
);

-- the table to store BranchSession data
drop table if exists `branch_table`;
create table `branch_table` (
  `branch_id` bigint not null,
  `xid` varchar(128) not null,
  `transaction_id` bigint ,
  `resource_group_id` varchar(32),
  `resource_id` varchar(256) ,
  `lock_key` varchar(128) ,
  `branch_type` varchar(8) ,
  `status` tinyint,
  `client_id` varchar(64),
  `application_data` varchar(2000),
  `gmt_create` datetime,
  `gmt_modified` datetime,
  primary key (`branch_id`),
  key `idx_xid` (`xid`)
);

-- the table to store lock data
drop table if exists `lock_table`;
create table `lock_table` (
  `row_key` varchar(128) not null,
  `xid` varchar(96),
  `transaction_id` long ,
  `branch_id` long,
  `resource_id` varchar(256) ,
  `table_name` varchar(32) ,
  `pk` varchar(36) ,
  `gmt_create` datetime ,
  `gmt_modified` datetime,
  primary key(`row_key`)
);

2.3修改seata\conf目录下的registry.conf配置文件

配置nacos

2.4 启动

先启动nacos 在启动bin/seata-server.bat

3.对seata的@GlobalTransactional事务进行测试

3.1新建数据库

#订单库-----------------------------------------------------------------
CREATE DATABASE seata_order；

CREATE TABLE t_order(
    `id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
    `user_id` BIGINT(11) DEFAULT NULL COMMENT '用户id',
    `product_id` BIGINT(11) DEFAULT NULL COMMENT '产品id',
    `count` INT(11) DEFAULT NULL COMMENT '数量',
    `money` DECIMAL(11,0) DEFAULT NULL COMMENT '金额',
    `status` INT(1) DEFAULT NULL COMMENT '订单状态：0：创建中; 1：已完结'
) ENGINE=INNODB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
 
SELECT * FROM t_order;

#库存库-----------------------------------------------------------------
CREATE DATABASE seata_storage；

CREATE TABLE t_storage(
    `id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
    `product_id` BIGINT(11) DEFAULT NULL COMMENT '产品id',
   `'total` INT(11) DEFAULT NULL COMMENT '总库存',
    `used` INT(11) DEFAULT NULL COMMENT '已用库存',
    `residue` INT(11) DEFAULT NULL COMMENT '剩余库存'
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
 
INSERT INTO seata_storage.t_storage(`id`,`product_id`,`total`,`used`,`residue`)
VALUES('1','1','100','0','100');
 
 

#余额库-----------------------------------------------------------------
CREATE DATABASE seata_account；

CREATE TABLE t_account(
    `id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'id',
    `user_id` BIGINT(11) DEFAULT NULL COMMENT '用户id',
    `total` DECIMAL(10,0) DEFAULT NULL COMMENT '总额度',
    `used` DECIMAL(10,0) DEFAULT NULL COMMENT '已用余额',
    `residue` DECIMAL(10,0) DEFAULT '0' COMMENT '剩余可用额度'
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
 
INSERT INTO seata_account.t_account(`id`,`user_id`,`total`,`used`,`residue`) VALUES('1','1','1000','0','1000')
 
SELECT * FROM t_account;

3.1.3 三库分别建对应的回滚日志表

-- the table to store seata xid data
-- 0.7.0+ add context
-- you must to init this sql for you business databese. the seata server not need it.
-- 此脚本必须初始化在你当前的业务数据库中，用于AT 模式XID记录。与server端无关（注：业务数据库）
-- 注意此处0.3.0+ 增加唯一索引 ux_undo_log
drop table `undo_log`;
CREATE TABLE `undo_log` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(100) NOT NULL,
  `context` varchar(128) NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int(11) NOT NULL,
  `log_created` datetime NOT NULL,
  `log_modified` datetime NOT NULL,
  `ext` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

最终效果

3.2相同模块

3.2.1pom

<dependencies>
        <dependency>
            <groupId>com.psf.spirngcloud.Alibaba</groupId>
            <artifactId>alibaba-psf-basic</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!--nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--seata-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>seata-all</artifactId>
                    <groupId>io.seata</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <version>1.0.0</version>
        </dependency>
        <!--feign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!--web-actuator-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--mysql-druid-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.37</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

3.2.2 DataSourceProxyConfig

其中最为重要的是将Seata所提供的数据源代理（DataSourceProxy）实例化配置放到了这个模块中，数据库代理相关配置代

package com.psf.springcloud.Alibaba.config;

import com.alibaba.druid.pool.DruidDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;
@Configuration
public class DataSourceProxyConfig {


    @Value("${mybatis.mapperLocations}")
    private String mapperLocations;


    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }


    @Bean
    public DataSourceProxy dataSourceProxy(DataSource dataSource) {
        return new DataSourceProxy(dataSource);
    }


    @Bean
    public SqlSessionFactory sqlSessionFactoryBean(DataSourceProxy dataSourceProxy) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSourceProxy);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
        sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
        return sqlSessionFactoryBean.getObject();
    }

}

3.2.3 MyBatisConfig

package com.psf.springcloud.Alibaba.config;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@MapperScan({"com.psf.springcloud.Alibaba.dao"})
public class MyBatisConfig {
}

3.2.4 file.conf 和 registry.confq

复制seata/conf/file.conf文件及 registry.conf

file.conf

service {
  #transaction service group mapping
  vgroup_mapping.seata_tx_group = "default"
  #only support when registry.type=file, please don't set multiple addresses
  default.grouplist = "127.0.0.1:8091"
  #disable seata
  disableGlobalTransaction = false
}

## transaction log store, only used in seata-server
store {
  ## store mode: file、db
  mode = "db"

  ## file store property
  file {
    ## store location dir
    dir = "sessionStore"
  }

  ## database store property
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
    datasource = "dbcp"
    ## mysql/oracle/h2/oceanbase etc.
    db-type = "mysql"
    driver-class-name = "com.mysql.jdbc.Driver"
    url = "jdbc:mysql://127.0.0.1:3306/seata"
    user = "root"
    password = "root"
  }
}

registry.conf

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"

  nacos {
    serverAddr = "localhost:8848"
    namespace = ""
    cluster = "default"
  }
  eureka {
    serviceUrl = "http://localhost:8761/eureka"
    application = "default"
    weight = "1"
  }
  redis {
    serverAddr = "localhost:6379"
    db = "0"
  }
  zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
  consul {
    cluster = "default"
    serverAddr = "127.0.0.1:8500"
  }
  etcd3 {
    cluster = "default"
    serverAddr = "http://localhost:2379"
  }
  sofa {
    serverAddr = "127.0.0.1:9603"
    application = "default"
    region = "DEFAULT_ZONE"
    datacenter = "DefaultDataCenter"
    cluster = "default"
    group = "SEATA_GROUP"
    addressWaitTime = "3000"
  }
  file {
    name = "file.conf"
  }
}

config {
  # file、nacos 、apollo、zk、consul、etcd3
  type = "file"

  nacos {
    serverAddr = "localhost"
    namespace = ""
  }
  consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    app.id = "seata-server"
    apollo.meta = "http://192.168.1.204:8801"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}

3.2 新建订单seata-order-service8001

服务配置

server:
  port: 8001

spring:
  application:
    name: seata-order-service
  cloud:
    alibaba:
      seata:
        #自定义事务组名称需要与seata-server中的对应
        tx-service-group: seata_tx_group
    nacos:
      discovery:
        server-addr: localhost:8848
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_order
    username: root
    password: root

feign:
  hystrix:
    enabled: false

logging:
  level:
    io:
      seata: info

mybatis:
  mapperLocations: classpath:mapper/*.xml

业务

package com.psf.springcloud.Alibaba.service.impl;

import com.psf.springcloud.Alibaba.dao.OrderDao;
import com.psf.springcloud.Alibaba.entity.Order;
import com.psf.springcloud.Alibaba.service.AccountService;
import com.psf.springcloud.Alibaba.service.OrderService;
import com.psf.springcloud.Alibaba.service.StorageService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
//下订单->减库存->扣余额->改（订单）状态
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Resource
    private OrderDao orderDao;

    @Resource
    private AccountService accountService;

    @Resource
    private StorageService storageService;

    @Override
    //添加全局回滚
    @GlobalTransactional(name = "fallback",rollbackFor = Exception.class)
    public void Create(Order order) {
        //1.新建订单
        log.info("新建订单");
        orderDao.insertOrder(order);

        log.info("减库存");
        storageService.decrease(order.getProductId(),order.getCount());

        log.info("扣余额");
        accountService.decrease(order.getUserId(),order.getMoney());

        log.info("改（订单）状态");
        orderDao.updateOrder(order.getUserId(),0);

    }
}

account接口

package com.psf.springcloud.Alibaba.service;

import com.psf.springcloud.Alibaba.entity.CommonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.math.BigDecimal;

/**
 * 余额account
 */
@FeignClient(value = "seata-account-service")
public interface AccountService {

    @PostMapping(value = "/account/decrease")
    CommonResult decrease(@RequestParam("userId")Long userId,@RequestParam("money") BigDecimal money);
}

库存storage接口

package com.psf.springcloud.Alibaba.service;

import com.psf.springcloud.Alibaba.entity.CommonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * 库存storage
 */
@FeignClient(value = "seata-storage-service")
public interface StorageService {


    //减少库存
    @PostMapping(value = "/storage/decrease")
 CommonResult decrease(@RequestParam("productId")Long productId,@RequestParam("count")Integer count);
}

controller

package com.psf.springcloud.Alibaba.controller;

import com.psf.springcloud.Alibaba.entity.CommonResult;
import com.psf.springcloud.Alibaba.entity.Order;
import com.psf.springcloud.Alibaba.service.OrderService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;


@RestController
@Slf4j
public class OrderController {

    @Resource
    private OrderService orderService;

    @GetMapping("/order/create")
    public CommonResult create(Order order){

        orderService.Create(order);
        return new CommonResult(200,"成功",order);
    }
}

dao

package com.psf.springcloud.Alibaba.dao;

import com.psf.springcloud.Alibaba.entity.Order;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

/**
 * @ClassName： OrderDao
 * @Auther: Administrator
 * @Date: 2020/6/30 16:36
 * @return version 1.0
 */
@Mapper
public interface OrderDao {

    /**
     * 新增订单
     * @param order
     */
    void insertOrder(Order order);

    /**
     * 修改订单状态
     * @param userId
     * @param status
     */
    void updateOrder(@Param("userId")Long userId,@Param("status")Integer status);
}

mapper

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.psf.springcloud.Alibaba.dao.OrderDao">

    <resultMap id="baseResultMap" type="com.psf.springcloud.Alibaba.entity.Order">
        <id column="id" property="id" jdbcType="BIGINT"></id>
        <result column="user_id" property="userId" jdbcType="BIGINT"></result>
        <result column="product_id" property="productId" jdbcType="BIGINT"></result>
        <result column="count" property="count" jdbcType="INTEGER"></result>
        <result column="money" property="money" jdbcType="DECIMAL"></result>
        <result column="status" property="status" jdbcType="INTEGER"></result>
    </resultMap>

    <insert id="insertOrder" >
        insert into t_order(id,user_id,product_id,count,money,status)
        values (null,#{userId},#{productId},#{count},#{money},0)
    </insert>

    <update id="updateOrder">
        update t_order set status=1 where user_id=#{userId} and status=#{status}
    </update>
</mapper>

3.3 新建账户seata-account-service8002

服务配置

server:
  port: 8002

spring:
  application:
    name: seata-account-service
  cloud:
    alibaba:
      seata:
        #自定义事务组名称需要与seata-server中的对应
        tx-service-group: seata_tx_group
    nacos:
      discovery:
        server-addr: localhost:8848
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_account
    username: root
    password: root

feign:
  hystrix:
    enabled: false

logging:
  level:
    io:
      seata: info

mybatis:
  mapperLocations: classpath:mapper/*.xml

controller

package com.psf.springcloud.Alibaba.controller;

import com.psf.springcloud.Alibaba.entity.CommonResult;
import com.psf.springcloud.Alibaba.service.AccountService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.math.BigDecimal;


@RestController
@Slf4j
public class AccountController {

    @Resource
    private AccountService accountService;

    @RequestMapping("/account/decrease")
    public CommonResult decrease(@RequestParam("userId") Long userId,@RequestParam("money") BigDecimal money){

        accountService.decrease(userId, money);
        return new CommonResult(200,"余额扣减成功");
    }
}

package com.psf.springcloud.Alibaba.dao;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

import java.math.BigDecimal;


@Mapper
public interface AccountDao {

    void update(@Param("userId") Long userId,@Param("money") BigDecimal money);
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.psf.springcloud.Alibaba.dao.AccountDao">

    <resultMap id="accountMap" type="com.psf.springcloud.Alibaba.entity.Account">
        <id column="id" property="id" jdbcType="BIGINT"></id>
        <result column="user_id" property="userId" jdbcType="BIGINT"></result>
        <result column="total" property="total" jdbcType="DECIMAL"></result>
        <result column="used" property="used" jdbcType="DECIMAL"></result>
        <result column="residue" property="residue" jdbcType="DECIMAL"></result>

    </resultMap>
    <update id="update">
        update t_account set used=used+#{money},residue=residue-#{money} where user_id=#{userId}
    </update>

</mapper>

3.4 新建库存seata-storage-service8003

服务配置

server:
  port: 8003

spring:
  application:
    name: seata-storage-service
  cloud:
    alibaba:
      seata:
        #自定义事务组名称需要与seata-server中的对应
        tx-service-group: seata_tx_group
    nacos:
      discovery:
        server-addr: localhost:8848
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_storage
    username: root
    password: root

feign:
  hystrix:
    enabled: false

logging:
  level:
    io:
      seata: info

mybatis:
  mapperLocations: classpath:mapper/*.xml

controller

package com.psf.springcloud.Alibaba.controller;

import com.psf.springcloud.Alibaba.entity.CommonResult;
import com.psf.springcloud.Alibaba.service.StorageService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;


@RestController
@Slf4j
public class StorageController {

    @Resource
    private StorageService storageService;

    @RequestMapping("/storage/decrease")
    public CommonResult decrease(@RequestParam("productId")Long productId, @RequestParam("count")Integer count){

        storageService.decrease(productId,count);
        return new CommonResult(200,"修改库存");
    }
}

package com.psf.springcloud.Alibaba.dao;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface StorageDao {


    void update(@Param("productId") Long productId,@Param("count") Integer count);
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.psf.springcloud.Alibaba.dao.StorageDao">

    <resultMap id="storageMap" type="com.psf.springcloud.Alibaba.entity.Storage">
        <id column="id" property="id" jdbcType="BIGINT"></id>
        <result column="product_id" property="productId" jdbcType="BIGINT"></result>
        <result column="total" property="total" jdbcType="INTEGER"></result>
        <result column="used" property="used" jdbcType="INTEGER"></result>
        <result column="residue" property="residue" jdbcType="INTEGER"></result>
    </resultMap>

    <update id="update">
        update t_storage set used=used+#{count},residue=residue-#{count} where product_id=#{productId}
    </update>
</mapper>

3.5添加全局回滚@GlobalTransactional

order

@GlobalTransactional(name = "fallback",rollbackFor = Exception.class)
public void Create(Order order) {
}

3.6启动测试

先启动 nacos，seata
再运行 8001–8002–8003

不添加@GlobalTransactional时，运行异常时，当库存和账户余额扣减后，订单状态并没有设置为已经完成，没有从零改为1，而且由于feign的重试机制，账户余额还有可能被多次扣减。
添加@GlobalTransactional时：下单后数据库数据并没有任何改变，记录都添加不进来。

4.seata事务原理