1. Seata 是什么?

由于业务和技术的发展,单体应用被拆分成微服务应用,原来的三个模块被拆分成三个独立的应用,分别使用三个独立的数据源,业务操作需要调用三个服务来完成。此时每个服务内部的数据一致性由本地事务来保证, 但是全局的数据一致性问题没法保证。

Seata 是一款开源的分布式事务解决方案,致力于提供高性能和简单易用的分布式事务服务。Seata 将为用户提供了 AT、TCC、SAGA 和 XA 事务模式,为用户打造一站式的分布式解决方案。https://seata.io/zh-cn/docs/overview/what-is-seata.html
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seata分布式事务处理过程的一ID+三组件模型:

  • Transaction ID XID 全局唯一的事务ID
  • 三组件概念
    • TC (Transaction Coordinator) - 事务协调者:维护全局和分支事务的状态,驱动全局事务提交或回滚。
    • TM (Transaction Manager) - 事务管理器:定义全局事务的范围:开始全局事务、提交或回滚全局事务。
    • RM (Resource Manager) - 资源管理器:管理分支事务处理的资源,与TC交谈以注册分支事务和报告分支事务的状态,并驱动分支事务提交或回滚。

处理过程:

  1. TM向TC申请开启一个全局事务,全局事务创建成功并生成一个全局唯一的XID;
  2. XID在微服务调用链路的上下文中传播;
  3. RM向TC注册分支事务,将其纳入XID对应全局事务的管辖;
  4. TM向TC发起针对XID的全局提交或回滚决议;
  5. TC调度XID下管辖的全部分支事务完成提交或回滚请求。

2. seata安装

Seata分TC、TM和RM三个角色,TC(Server端)为单独服务端部署,TM和RM(Client端)由业务系统集成。

本例前置条件:

  1. 默认nacos已经安装完成并启动,并开启了持久化配置
  2. 使用mysql8.0+数据库
2.1. Server端安装

seata1.5.2安装 + nacos2.1.1服务注册和配置中心集成
1. 下载seata 1.5.2: https://github.com/seata/seata/releases
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2. 放在合适的路径下解压缩: 注意路径中一定不能出现中文和空格,否则会导致之后的git命令无法成功执行
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3. 在数据库中创建全局事务所需要的表: 全局事务会话信息由3块内容构成,全局事务–>分支事务–>全局锁,对应表global_table、branch_table、lock_table

  1. 在数据库中创建一个名叫seata的数据库
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  2. 执行sql脚本创建数据表,该脚本可以在seata安装包中查看,或在git项目中https://github.com/seata/seata/blob/master/script/server/db/mysql.sql,获取最新的sql脚本。

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  1. seata 1.5.0 新增了distributed_lock表用于 seata-server 异步任务调度,并将字符集改为了utf8mb4。
  2. 默认事务分组的由my_test_tx_group 修改为 default_tx_group
  3. 更多升级信息可以查看官方文档:https://seata.io/zh-cn/docs/ops/upgrade.html
-- -------------------------------- The script used when storeMode is 'db' --------------------------------
-- the table to store GlobalSession data
CREATE TABLE IF NOT EXISTS `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_status_gmt_modified` (`status` , `gmt_modified`),
    KEY `idx_transaction_id` (`transaction_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8mb4;

-- the table to store BranchSession data
CREATE TABLE IF NOT EXISTS `branch_table`
(
    `branch_id`         BIGINT       NOT NULL,
    `xid`               VARCHAR(128) NOT NULL,
    `transaction_id`    BIGINT,
    `resource_group_id` VARCHAR(32),
    `resource_id`       VARCHAR(256),
    `branch_type`       VARCHAR(8),
    `status`            TINYINT,
    `client_id`         VARCHAR(64),
    `application_data`  VARCHAR(2000),
    `gmt_create`        DATETIME(6),
    `gmt_modified`      DATETIME(6),
    PRIMARY KEY (`branch_id`),
    KEY `idx_xid` (`xid`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8mb4;

-- the table to store lock data
CREATE TABLE IF NOT EXISTS `lock_table`
(
    `row_key`        VARCHAR(128) NOT NULL,
    `xid`            VARCHAR(128),
    `transaction_id` BIGINT,
    `branch_id`      BIGINT       NOT NULL,
    `resource_id`    VARCHAR(256),
    `table_name`     VARCHAR(32),
    `pk`             VARCHAR(36),
    `status`         TINYINT      NOT NULL DEFAULT '0' COMMENT '0:locked ,1:rollbacking',
    `gmt_create`     DATETIME,
    `gmt_modified`   DATETIME,
    PRIMARY KEY (`row_key`),
    KEY `idx_status` (`status`),
    KEY `idx_branch_id` (`branch_id`),
    KEY `idx_xid_and_branch_id` (`xid` , `branch_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8mb4;

CREATE TABLE IF NOT EXISTS `distributed_lock`
(
    `lock_key`       CHAR(20) NOT NULL,
    `lock_value`     VARCHAR(20) NOT NULL,
    `expire`         BIGINT,
    primary key (`lock_key`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8mb4;

INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('AsyncCommitting', ' ', 0);
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('RetryCommitting', ' ', 0);
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('RetryRollbacking', ' ', 0);
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('TxTimeoutCheck', ' ', 0);
  1. 修改seata - config下的application.yaml配置文件,使用nacos作为服务注册发现中心和配置中心,其他详细配置可以参照seata提供的模板application.example.yml
    3.1. 在nacos中新建一个命名空间,并记录下空间ID
    3.2. 修改application.yml:主要修改项seata 下的 config、registry、store
server:
  port: 7091

spring:
  application:
    name: seata-server

logging:
  config: classpath:logback-spring.xml
  file:
    path: ${user.home}/logs/seata
  extend:
    logstash-appender:
      destination: 127.0.0.1:4560
    kafka-appender:
      bootstrap-servers: 127.0.0.1:9092
      topic: logback_to_logstash

console:
  user:
    username: seata
    password: seata

seata:
  config:
    # support: nacos, consul, apollo, zk, etcd3
    type: nacos
    nacos:
      server-addr: localhost:8848
      namespace: 704a579f-f1ef-45fd-818e-4e5c113ca50d
      group: SEATA_GROUP
      username: nacos
      password: nacos
      #data-id: seataServer.properties  
  registry:
    # support: nacos, eureka, redis, zk, consul, etcd3, sofa
    type: nacos
    nacos:
      application: seata-server
      server-addr: localhost:8848
      group: SEATA_GROUP
      namespace: 704a579f-f1ef-45fd-818e-4e5c113ca50d
      cluster: default
      username: nacos
      password: nacos
      ##if use MSE Nacos with auth, mutex with username/password attribute
      #access-key: ""
      #secret-key: ""
  store:
    # support: file 、 db 、 redis
    mode: db
    db:
      datasource: druid
      db-type: mysql
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/seata?rewriteBatchedStatements=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
      user: root
      password: 123456
      min-conn: 1
      max-conn: 20
      global-table: global_table
      branch-table: branch_table
      lock-table: lock_table
      distributed-lock-table: distributed_lock
      query-limit: 100
      max-wait: 10000
  server:
    service-port: 8091 #If not configured, the default is '${server.port} + 1000'
    max-commit-retry-timeout: -1
    max-rollback-retry-timeout: -1
    rollback-retry-timeout-unlock-enable: false
    enable-check-auth: true
    enable-parallel-request-handle: true
    retry-dead-threshold: 130000
    xaer-nota-retry-timeout: 60000
    undo:
      log-save-days: 7
      log-delete-period: 86400000
    session:
      branch-async-queue-size: 5000 #branch async remove queue size
      enable-branch-async-remove: false #enable to asynchronous remove branchSession
  security:
    secretKey: SeataSecretKey0c382ef121d778043159209298fd40bf3850a017
    tokenValidityInMilliseconds: 1800000
    ignore:
      urls: /,/**/*.css,/**/*.js,/**/*.html,/**/*.map,/**/*.svg,/**/*.png,/**/*.ico,/console-fe/public/**,/api/v1/auth/login

3.3. 修改config配置文件
将D:\seata\script\config-center下的config.txt复制一份到seata的目录下,与bin目录同级,并修改配置信息,主要修改store.mode和store.db(可以将不需要的配置信息删除掉,以防在nacos配置中心中产生太多无用的配置项,例如file和Redis的相关配置)
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#For details about configuration items, see https://seata.io/zh-cn/docs/user/configurations.html
#Transport configuration, for client and server
transport.type=TCP
transport.server=NIO
transport.heartbeat=true
transport.enableTmClientBatchSendRequest=false
transport.enableRmClientBatchSendRequest=true
transport.enableTcServerBatchSendResponse=false
transport.rpcRmRequestTimeout=30000
transport.rpcTmRequestTimeout=30000
transport.rpcTcRequestTimeout=30000
transport.threadFactory.bossThreadPrefix=NettyBoss
transport.threadFactory.workerThreadPrefix=NettyServerNIOWorker
transport.threadFactory.serverExecutorThreadPrefix=NettyServerBizHandler
transport.threadFactory.shareBossWorker=false
transport.threadFactory.clientSelectorThreadPrefix=NettyClientSelector
transport.threadFactory.clientSelectorThreadSize=1
transport.threadFactory.clientWorkerThreadPrefix=NettyClientWorkerThread
transport.threadFactory.bossThreadSize=1
transport.threadFactory.workerThreadSize=default
transport.shutdown.wait=3
transport.serialization=seata
transport.compressor=none

#Transaction routing rules configuration, only for the client
service.vgroupMapping.default_tx_group=default
#If you use a registry, you can ignore it
service.default.grouplist=127.0.0.1:8091
service.enableDegrade=false
service.disableGlobalTransaction=false

#Transaction rule configuration, only for the client
client.rm.asyncCommitBufferLimit=10000
client.rm.lock.retryInterval=10
client.rm.lock.retryTimes=30
client.rm.lock.retryPolicyBranchRollbackOnConflict=true
client.rm.reportRetryCount=5
client.rm.tableMetaCheckEnable=true
client.rm.tableMetaCheckerInterval=60000
client.rm.sqlParserType=druid
client.rm.reportSuccessEnable=false
client.rm.sagaBranchRegisterEnable=false
client.rm.sagaJsonParser=fastjson
client.rm.tccActionInterceptorOrder=-2147482648
client.tm.commitRetryCount=5
client.tm.rollbackRetryCount=5
client.tm.defaultGlobalTransactionTimeout=60000
client.tm.degradeCheck=false
client.tm.degradeCheckAllowTimes=10
client.tm.degradeCheckPeriod=2000
client.tm.interceptorOrder=-2147482648
client.undo.dataValidation=true
client.undo.logSerialization=jackson
client.undo.onlyCareUpdateColumns=true
server.undo.logSaveDays=7
server.undo.logDeletePeriod=86400000
client.undo.logTable=undo_log
client.undo.compress.enable=true
client.undo.compress.type=zip
client.undo.compress.threshold=64k
#For TCC transaction mode
tcc.fence.logTableName=tcc_fence_log
tcc.fence.cleanPeriod=1h

#Log rule configuration, for client and server
log.exceptionRate=100

#Transaction storage configuration, only for the server. The file, DB, and redis configuration values are optional.
store.mode=db
store.lock.mode=db
store.session.mode=db
#Used for password encryption
store.publicKey=

#These configurations are required if the `store mode` is `db`. If `store.mode,store.lock.mode,store.session.mode` are not equal to `db`, you can remove the configuration block.
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.cj.jdbc.Driver
store.db.url=jdbc:mysql://localhost:3306/seata?rewriteBatchedStatements=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
store.db.user=root
store.db.password=123456
store.db.minConn=1
store.db.maxConn=20
store.db.globalTable=global_table
store.db.branchTable=branch_table
store.db.distributedLockTable=distributed_lock
store.db.queryLimit=100
store.db.lockTable=lock_table
store.db.maxWait=10000

#Transaction rule configuration, only for the server
server.recovery.committingRetryPeriod=1000
server.recovery.asynCommittingRetryPeriod=1000
server.recovery.rollbackingRetryPeriod=1000
server.recovery.timeoutRetryPeriod=1000
server.maxCommitRetryTimeout=-1
server.maxRollbackRetryTimeout=-1
server.rollbackRetryTimeoutUnlockEnable=false
server.distributedLockExpireTime=10000
server.xaerNotaRetryTimeout=60000
server.session.branchAsyncQueueSize=5000
server.session.enableBranchAsyncRemove=false
server.enableParallelRequestHandle=false

#Metrics configuration, only for the server
metrics.enabled=false
metrics.registryType=compact
metrics.exporterList=prometheus
metrics.exporterPrometheusPort=9898

  1. 注意需要将store.mode的三项DB改为小写db
  2. rewriteBatchedStatements=true,数据库链接中这一句是特别要加的,可以提升执行效率

3.4. 使用git将上面修改好的seata的配置导入nacos配置中心
复制D:\seata\script\config-center\nacos下的nacos-config.sh到D:\seata\conf文件夹下
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右键启用git命令:输入以下命令并回车执行,等待数据同步即可
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sh nacos-config.sh -h localhost -p 8848 -g SEATA_GROUP -t 704a579f-f1ef-45fd-818e-4e5c113ca50d -u nacos -w nacos

参数详情:
-h -p 指定nacos的端口地址;
-g 指定配置的分组,注意,是配置的分组;
-t 指定命名空间ID;
-u -w指定nacos的用户名和密码,使用nacos注册和配置认证的才需要指定。

导入成功后可以在nacos中查看到配置信息
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2.2. Client端集成

基于springcloud分布式项目集成seata-Client端,首先需要搭建一个简单的测试服务环境:使用典型的订单系统,创建分布式微服务系统:共三个微服务模块

  • 订单管理:seata-order-service
  • 库存管理:seata-storage-service
  • 账户管理:seata-account-service

本例前置条件:
1. 使用openFeign作为微服务远程调用框架
2. 使用mybatis作为持久层框架
3. 使用nacos作为服务注册中心
4. 需要注意各框架版本,否则会出现版本冲突:详细信息查看https://github.com/alibaba/spring-cloud-alibaba/wiki/版本说明

2.2.1. 创建父Maven项目,进行依赖版本控制

主要的依赖项和使用版本:

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <junit.version>4.12</junit.version>
    <log4j.version>1.2.17</log4j.version>
    <lombok.version>1.16.18</lombok.version>
    <mysql.version>8.0.23</mysql.version>
    <druid.version>1.2.8</druid.version>
    <mybatis.spring.boot.version>1.3.2</mybatis.spring.boot.version>
  </properties>

  <dependencyManagement>
    <dependencies>
      <!--springboot-->
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.3.12.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!--springCloud-->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Hoxton.SR12</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!--springCloud alibaba-->
      <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-dependencies</artifactId>
        <version>2.2.9.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
      </dependency>
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>${druid.version}</version>
      </dependency>
      <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>${mybatis.spring.boot.version}</version>
      </dependency>
      <!--junit-->
      <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>${junit.version}</version>
      </dependency>
      <!--log4j-->
      <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>${log4j.version}</version>
      </dependency>
    </dependencies>
  </dependencyManagement>
2.2.2. 创建库存管理微服务:seata-storage-service

1. 添加pom依赖:在父项目下新建module seata-storage-service2002,并添加依赖

<artifactId>seata-storage-service2002</artifactId>
    <dependencies>
        <!--nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--seata-->
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.5.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <version>2021.1</version>
            <exclusions>
                <exclusion>
                    <groupId>io.seata</groupId>
                    <artifactId>seata-spring-boot-starter</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--web-->
        <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 connector-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--mysql druid-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </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>

2. 修改application.yaml配置,以下为全部配置信息
需要先创建一个名叫seata_storage的数据库,以便数据库链接的配置:
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server:
  port: 2002

spring:
  application:
    name: seata-storage-service
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_storage?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    username: root
    password: 123456

mybatis:
  mapper-locations: classpath:mapper/*.xml

# seata 配置
seata:
  # seata配置中心
  tx-service-group: default_tx_group
  config:
    type: nacos
    nacos:
      namespace: 704a579f-f1ef-45fd-818e-4e5c113ca50d
      # nacos配置中心地址
      server-addr: localhost:8848
      # 分组
      group: SEATA_GROUP
      # nacos的账号和密码
      userName: nacos
      password: nacos
  # seata的注册中心
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: localhost:8848
      namespace: 704a579f-f1ef-45fd-818e-4e5c113ca50d
      userName: nacos
      password: nacos
  service:
    vgroup-mapping:
      default_tx_group: default

3. 编写业务代码
整体包结构:
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domain包:
CommonResult:

package com.atguigu.alibaba.seata.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
    private Integer code;
    private String  message;
    private T       data;

    public CommonResult(Integer code, String message)
    {
        this(code,message,null);
    }
}

Storage:

package com.atguigu.alibaba.seata.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Storage {
    private Long id;            //主键
    private Long productId;     //产品ID
    private Integer total;      //库存总量
    private Integer used;       //已用库存数量
    private Integer residue;    //剩余库存数量
}

数据库建表sql:在seata_storage下创建业务表

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=1 DEFAULT CHARSET=utf8;

INSERT INTO seata_storage.t_storage(`id`, `product_id`, `total`, `used`, `residue`)
VALUES ('1', '1', '100', '0','100');

SELECT * FROM t_storage;

dao包:
StorageDao:

package com.atguigu.alibaba.seata.dao;

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

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@Mapper
public interface StorageDao {
    public void decrease(@Param("productId") Long productId, @Param("count") Integer count);
}

在resources下创建一个名叫mapper的文件夹,用来放mybatis的xml映射文件

<?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" >
<!--Dao的全路径-->
<mapper namespace="com.atguigu.alibaba.seata.dao.StorageDao">
    <!--对应entity的全路径-->
    <resultMap id="BaseResultMap" type="com.atguigu.alibaba.seata.domain.Storage">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="product_id" property="productId" jdbcType="BIGINT"/>
        <result column="total" property="total" jdbcType="INTEGER"/>
        <result column="used" property="used" jdbcType="INTEGER"/>
        <result column="residue" property="residue" jdbcType="INTEGER"/>
    </resultMap>
    <update id="decrease">
        update
            t_storage
        set
            used = used + #{count}, residue = residue - #{count}
        where
            product_id = #{productId}
    </update>
</mapper>

service包:
StorageService:

package com.atguigu.alibaba.seata.service;

import org.springframework.web.bind.annotation.RequestParam;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
public interface StorageService {
    public void decrease(@RequestParam("productId") Long productId,@RequestParam("count") Integer count);
}

service.impl包:
StorageServiceImpl:

package com.atguigu.alibaba.seata.service.impl;

import com.atguigu.alibaba.seata.dao.StorageDao;
import com.atguigu.alibaba.seata.service.StorageService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@Service
public class StorageServiceImpl implements StorageService {
    private static final Logger LOGGER = LoggerFactory.getLogger(StorageServiceImpl.class);
    @Resource
    private StorageDao storageDao;

    @Override
    public void decrease(Long productId, Integer count) {
        LOGGER.info("------->storage-service中扣减库存开始");
        storageDao.decrease(productId,count);
        LOGGER.info("------->storage-service中扣减库存结束");
    }
}

controller包:
StorageController:

package com.atguigu.alibaba.seata.controller;

import com.atguigu.alibaba.seata.domain.CommonResult;
import com.atguigu.alibaba.seata.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;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@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,"扣减库存成功!");
    }
}

config包:配置mybatis的包扫描
MyBatisConfig:

package com.atguigu.alibaba.seata.config;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@Configuration
@MapperScan({"com.atguigu.alibaba.seata.dao"})
public class MyBatisConfig {

}

主程序入口:

package com.atguigu.alibaba.seata;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@EnableDiscoveryClient
@SpringBootApplication
public class StorageMain {
    public static void main(String[] args) {
        SpringApplication.run(StorageMain.class,args);
    }
}
2.2.3. 创建账户管理微服务:seata-account-service

1. 添加pom依赖:在父项目下新建module seata-account-service2003,并添加依赖

    <artifactId>seata-account-service2003</artifactId>
    <dependencies>
        <!--nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--seata-->
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.5.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <version>2021.1</version>
            <exclusions>
                <exclusion>
                    <groupId>io.seata</groupId>
                    <artifactId>seata-spring-boot-starter</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--web-->
        <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 connector-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--mysql druid-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </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>

2. 修改application.yaml配置,以下为全部配置信息
需要先创建一个名叫seata_account的数据库,以便数据库链接的配置:
在这里插入图片描述

server:
  port: 2003

spring:
  application:
    name: seata-account-service
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_account?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    username: root
    password: 123456

mybatis:
  mapper-locations: classpath:mapper/*.xml

# seata 配置
seata:
  # seata配置中心
  tx-service-group: default_tx_group
  config:
    type: nacos
    nacos:
      namespace: 704a579f-f1ef-45fd-818e-4e5c113ca50d
      # nacos配置中心地址
      server-addr: localhost:8848
      # 分组
      group: SEATA_GROUP
      # nacos的账号和密码
      userName: nacos
      password: nacos
  # seata的注册中心
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: localhost:8848
      namespace: 704a579f-f1ef-45fd-818e-4e5c113ca50d
      userName: nacos
      password: nacos
  service:
    vgroup-mapping:
      default_tx_group: default

3. 编写业务代码
整体包结构:
在这里插入图片描述

domain包:
CommonResult:

package com.atguigu.alibaba.seata.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
    private Integer code;
    private String  message;
    private T       data;

    public CommonResult(Integer code, String message)
    {
        this(code,message,null);
    }
}

Account:

package com.atguigu.alibaba.seata.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.math.BigDecimal;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Account {
    private Long id;            //主键
    private Long userId;        //用户ID
    private BigDecimal total;   //账户总额
    private BigDecimal used;    //已使用额度
    private BigDecimal residue; //剩余额度
}

数据库建表sql:在seata_account下创建业务表

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=1 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;

dao包:
AccountDao:

package com.atguigu.alibaba.seata.dao;

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

import java.math.BigDecimal;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@Mapper
public interface AccountDao {
    public void decrease(@Param("userId") Long userId,@Param("money") BigDecimal money);
}

在resources下创建一个名叫mapper的文件夹,用来放mybatis的xml映射文件

<?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.atguigu.alibaba.seata.dao.AccountDao">
    <resultMap id="BaseResultMap" type="com.atguigu.alibaba.seata.domain.Account">
        <id property="id" column="id" jdbcType="BIGINT"/>
        <result property="userId" column="user_id" jdbcType="BIGINT"/>
        <result property="total" column="total" jdbcType="DECIMAL"/>
        <result property="used" column="used" jdbcType="DECIMAL"/>
        <result property="residue" column="residue" jdbcType="DECIMAL"/>
    </resultMap>
    <update id="decrease">
        update
            t_account
        set
            residue = residue - #{money}, used = used + #{money}
        where
            user_id = #{userId}
    </update>
</mapper>

service包:
AccountService:

package com.atguigu.alibaba.seata.service;

import org.springframework.web.bind.annotation.RequestParam;

import java.math.BigDecimal;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
public interface AccountService {
    public void decrease (@RequestParam("userId") Long userId,@RequestParam("money") BigDecimal money);
}

service.impl包:
AccountServiceImpl:

package com.atguigu.alibaba.seata.service.impl;

import com.atguigu.alibaba.seata.dao.AccountDao;
import com.atguigu.alibaba.seata.service.AccountService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

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

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@Service
public class AccountServiceImpl implements AccountService {
    private static final Logger LOGGER = LoggerFactory.getLogger(AccountServiceImpl.class);
    @Resource
    private AccountDao accountDao;
    @Override
    public void decrease(Long userId, BigDecimal money) {
        LOGGER.info("------->Account-service中扣减金额开始");
        accountDao.decrease(userId, money);
        LOGGER.info("------->Account-service中扣减金额结束");
    }
}

controller包:

package com.atguigu.alibaba.seata.controller;

import com.atguigu.alibaba.seata.domain.CommonResult;
import com.atguigu.alibaba.seata.service.AccountService;
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;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@RestController
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,"扣减账户余额成功!");
    }
}

config包:
MyBatisConfig:

package com.atguigu.alibaba.seata.config;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@Configuration
@MapperScan({"com.atguigu.alibaba.seata.dao"})
public class MyBatisConfig {

}

主程序入口:

package com.atguigu.alibaba.seata;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月18日
 */
@EnableDiscoveryClient
@SpringBootApplication
public class AccountMain {
    public static void main(String[] args) {
        SpringApplication.run(AccountMain.class,args);
    }
}
2.2.4. 创建订单管理微服务:seata-order-service

1. 添加pom依赖:在父项目下新建module seata-order-service2001,并添加依赖

    <artifactId>seata-order-service2001</artifactId>
    <dependencies>
        <!--nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--seata 官方文档推荐依赖添加方式-->
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.5.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <version>2021.1</version>
            <exclusions>
                <exclusion>
                    <groupId>io.seata</groupId>
                    <artifactId>seata-spring-boot-starter</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--openfeign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>2.2.0.RELEASE</version>
        </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>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </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>

2. 修改application.yaml配置,以下为全部配置信息
需要先创建一个名叫seata_order的数据库,以便数据库链接的配置:
在这里插入图片描述

server:
  port: 2001

spring:
  application:
    name: seata-order-service
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_order?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    username: root
    password: 123456

mybatis:
  mapper-locations: classpath:mapper/*.xml

# seata 配置
seata:
  # seata配置中心
  tx-service-group: default_tx_group
  config:
    type: nacos
    nacos:
      namespace: 704a579f-f1ef-45fd-818e-4e5c113ca50d
      # nacos配置中心地址
      server-addr: localhost:8848
      # 分组
      group: SEATA_GROUP
      # nacos的账号和密码
      userName: nacos
      password: nacos
  # seata的注册中心
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: localhost:8848
      namespace: 704a579f-f1ef-45fd-818e-4e5c113ca50d
      userName: nacos
      password: nacos
  service:
    vgroup-mapping:
      default_tx_group: default

3. 编写业务代码
整体包结构:
在这里插入图片描述

domain包:
CommonResult:

package com.atguigu.alibaba.seata.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
    private Integer code;
    private String  message;
    private T       data;

    public CommonResult(Integer code, String message)
    {
        this(code,message,null);
    }
}

Order:也就是entity,和数据库字段对应

package com.atguigu.alibaba.seata.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.math.BigDecimal;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Order {
    private Long id;

    private Long userId;

    private Long productId;

    private Integer count;

    private BigDecimal money;

    private Integer status; //订单状态:0:创建中;1:已完结
}

数据库建表sql:在数据库中新建一个名叫seata-order的数据库,并创建业务表

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=1 DEFAULT CHARSET=utf8;

SELECT * FROM t_order;

dao包:
OrderDao:

package com.atguigu.alibaba.seata.dao;

import com.atguigu.alibaba.seata.domain.Order;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@Mapper
public interface OrderDao {
    //1 新建订单
    public void create(Order order);
    //2 修改订单状态,从零改为1
    public void update(@Param("userId") Long userId, @Param("status") Integer status);
}

在resources下创建一个名叫mapper的文件夹,用来放mybatis的xml映射文件

<?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" >
<!--Dao的全路径-->
<mapper namespace="com.atguigu.alibaba.seata.dao.OrderDao">
    <!--对应entity的全路径-->
    <resultMap id="BaseResultMap" type="com.atguigu.alibaba.seata.domain.Order">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="user_id" property="userId" jdbcType="BIGINT"/>
        <result column="product_id" property="productId" jdbcType="BIGINT"/>
        <result column="count" property="count" jdbcType="INTEGER"/>
        <result column="money" property="money" jdbcType="DECIMAL"/>
        <result column="status" property="status" jdbcType="INTEGER"/>
    </resultMap>

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

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

service包:因为订单服务需要调用库存和账户服务,所以需要使用openFeign进行远程调用服务接口,并且需要先行将这两个服务的接口创建好
StorageService:

package com.atguigu.alibaba.seata.service;

import com.atguigu.alibaba.seata.domain.CommonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@Service("storageService")
@FeignClient(value = "seata-storage-service")
public interface StorageService {
    @PostMapping(value = "/storage/decrease")
    CommonResult decrease(@RequestParam("productId") Long productId, @RequestParam("count") Integer count);
}

AccountService:

package com.atguigu.alibaba.seata.service;

import com.atguigu.alibaba.seata.domain.CommonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.math.BigDecimal;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@Service("accountService")
@FeignClient(value = "seata-account-service")
public interface AccountService {
    @PostMapping(value = "/account/decrease")
    CommonResult decrease(@RequestParam("userId") Long userId,@RequestParam("money") BigDecimal money);
}

OrderService:

package com.atguigu.alibaba.seata.service;

import com.atguigu.alibaba.seata.domain.Order;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
public interface OrderService {
    void create(Order order);
}

service.impl包:
OrderServiceImpl:

package com.atguigu.alibaba.seata.service.impl;

import com.atguigu.alibaba.seata.dao.OrderDao;
import com.atguigu.alibaba.seata.domain.Order;
import com.atguigu.alibaba.seata.service.AccountService;
import com.atguigu.alibaba.seata.service.OrderService;
import com.atguigu.alibaba.seata.service.StorageService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Resource
    private OrderDao orderDao;
    @Resource
    private StorageService storageService;
    @Resource
    private AccountService accountService;
    @Override
    @GlobalTransactional
    public void create(Order order) {
        log.info("----->开始新建订单");
        //1 新建订单
        orderDao.create(order);

        //2 扣减库存
        log.info("----->订单微服务开始调用库存,做扣减Count");
        storageService.decrease(order.getProductId(),order.getCount());
        log.info("----->订单微服务开始调用库存,做扣减end");

        //3 扣减账户
        log.info("----->订单微服务开始调用账户,做扣减Money");
        accountService.decrease(order.getUserId(),order.getMoney());
        log.info("----->订单微服务开始调用账户,做扣减end");

        //4 修改订单状态,从零到1,1代表已经完成
        log.info("----->修改订单状态开始");
        orderDao.update(order.getUserId(),0);
        log.info("----->修改订单状态结束");
    }
}

controller包:
OrderSeataController:

package com.atguigu.alibaba.seata.controller;

import com.atguigu.alibaba.seata.domain.CommonResult;
import com.atguigu.alibaba.seata.domain.Order;
import com.atguigu.alibaba.seata.service.OrderService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@RestController
public class OrderSeataController {
    @Resource
    private OrderService orderService;
    @GetMapping("/order/create")
    public CommonResult create(Order order){
        orderService.create(order);
        return new CommonResult(200,"订单创建成功");
    }
}

config包:

package com.atguigu.alibaba.seata.config;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@Configuration
@MapperScan({"com.atguigu.alibaba.seata.dao"})
public class MyBatisConfig {

}

主程序入口:

package com.atguigu.alibaba.seata;

import io.seata.spring.annotation.datasource.EnableAutoDataSourceProxy;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

/**
 * @author 强浩
 * @version 1.0.0
 * Copyright(c) YTANG All Rights Reserved
 * @className
 * @project 管理系统
 * @date 2022年10月17日
 */
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
@EnableAutoDataSourceProxy
public class OrderMain {
    public static void main(String[] args) {
        SpringApplication.run(OrderMain.class,args);
    }
}
2.2.5. 集成Seata - Client

1. 添加seata依赖(编写业务代码时已经添加完毕)
2. 在所有需要进行全局事务管理的业务数据库下新建undo_log表、配置参数(仅AT模式)
在这里插入图片描述

-- 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;

3. 数据源代理(不支持自动和手动配置并存):我这里使用的是seata-starter,默认开启了自动数据源代理,无需修改
4. 初始化GlobalTransactionScanner:自动,引入seata-spring-boot-starter、spring-cloud-starter-alibaba-seata等jar,无需修改
5. 实现xid跨服务传递:自动 springCloud用户可以引入spring-cloud-starter-alibaba-seata,内部已经实现xid传递,无需修改
官方部署指南:https://seata.io/zh-cn/docs/ops/deploy-guide-beginner.html

2.2.6. 业务使用

注解拦截:全局事务
在需要进行全局事务管理的入口接口上标注: @GlobalTransactional,例:

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Resource
    private OrderDao orderDao;
    @Resource
    private StorageService storageService;
    @Resource
    private AccountService accountService;
    @Override
    @GlobalTransactional
    public void create(Order order) {
        log.info("----->开始新建订单");
        //1 新建订单
        orderDao.create(order);

        //2 扣减库存
        log.info("----->订单微服务开始调用库存,做扣减Count");
        storageService.decrease(order.getProductId(),order.getCount());
        log.info("----->订单微服务开始调用库存,做扣减end");

        //3 扣减账户
        log.info("----->订单微服务开始调用账户,做扣减Money");
        accountService.decrease(order.getUserId(),order.getMoney());
        log.info("----->订单微服务开始调用账户,做扣减end");

        //4 修改订单状态,从零到1,1代表已经完成
        log.info("----->修改订单状态开始");
        orderDao.update(order.getUserId(),0);
        log.info("----->修改订单状态结束");
    }
}
2.2.7. 测试

1. 启动seata-server:双击bin下的seata-server.bat
2. 启动三个微服务:
发送请求:这时应该可以正常创建数据并扣减数据
http://localhost:2001/order/create?userId=1&productId=1&count=10&money=100
3. 先不添加@GlobalTransactional注解
在关闭account账户服务的情况下,发送请求:这时数据库应该创建了订单信息和扣减了库存,但账户没有扣减,出现了数据的不一致
http://localhost:2001/order/create?userId=1&productId=1&count=10&money=100
4. 添加@GlobalTransactional注解,在关闭account账户服务的情况下
发送请求:这时数据库应该不会创建任何数据加粗样式

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