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Seata

LiAngJava2024年3月23日SpringCloudJava大约 38 分钟约 7604 字

Seata 基础

先看一个问题，引出 Seata

1.单机单库(多表)处理事务示意图

image-20240323172442410
image-20240323172442410

2.分布式微服务架构下的数据库事务示意图

image-20240323174359740
image-20240323174359740

梳理

用户购买商品的业务逻辑。整个业务逻辑由3个微服务提供支持

仓储服务：对给定的商品扣除仓库/商品数量

订单服务：根据采购需求创建订单

帐户服务：从用户帐户中扣除余额

问题分析

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—致性问题没法保证

简单的说: 一次业务操作需要跨多个数据源或需要跨多个系统进行远程调用，就会产生分布式事务问题=》seata

分布式事务问题&解决方案

分布式微服务架构下的全局数据一致性问题 [即: 分布式事务问题]

解决方案: Seata

官网

https://seata.apache.org/zh-cn/

使用手册：https://seata.apache.org/zh-cn/docs/overview/what-is-seata

Seata 是什么？

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

Seata 工作机制/返讲

分布式事务过程分析

Seata 分布式事务处理过程-ID+三组件模型

image-20240324103014170
image-20240324103014170
image-20240324103232254
image-20240324103232254
image-20240324111632079
image-20240324111632079

几个术语

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

执行过程

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

XID在微服务调用链路的上下文中传播

RM 向 TC注册分支事务，将其纳入 XID 对应全局事务的管辖

TM 向 TC 发起针对 XID 的全局提交或回滚决议

TC 调度 XID下管辖的全部分支事务完成提交或回滚请求。

Seata事务模式

AT

默认模式：https://seata.apache.org/zh-cn/docs/user/mode/at

TCC

https://seata.apache.org/zh-cn/docs/user/mode/tcc

SAGA

https://seata.apache.org/zh-cn/docs/user/mode/saga

XA

https://seata.apache.org/zh-cn/docs/user/mode/xa

AT无侵入模式

一阶段加载

image-20240324112309891
image-20240324112309891
  1. 解析 SQL 语义，找到"业务 SQL"要更新的业务数据，在业务数据被更新前，将其保存成"before image" (前置镜像)
  2. 执行"业务 SQL"更新业务数据，在业务数据更新之后, 其保存成"after image"/后置镜像
  3. 最后生成行锁
  4. 以上操作全部在一个数据库事务内完成，这样保证了一阶段操作的原子性

二阶段提交

image-20240324113137759
image-20240324113137759
  1. 二阶段如果是顺利提交
  2. 因为"业务 SQL"在一阶段已经提交至数据库，所以 Seata 框架只需将一阶段保存的快照数据和行锁删掉，完成数据清理即可

二阶段回滚

image-20240324113315288
image-20240324113315288
  1. 二阶段如果是回滚的话，Seata 就需要回滚一阶段已经执行的"业务 SQL"，还原业务数据。
  2. 回滚方式便是用"before image"还原业务数据;但在还原前要首先要校验脏写，对比"数据库当前业务数据"和"after image 如果两份数据完全一致就说明没有脏写，可以还原业务数据
  3. 如果不一致就说明有脏写，出现脏写就需要转人工处理。

Seata Server安装

下载

https://github.com/seata/seata/releases/tag/v0.9.0

安装和配置

解压打到一个目录

修改 conf/file.conf 的 以下内容

service {
  #vgroup->rgroup
  #vgroup_mapping.my_test_tx_group = "default"
  vgroup_mapping.my_test_tx_group = "lzw_order_tx_group"
  #only support single node
  default.grouplist = "127.0.0.1:8091"
  #degrade current not support
  enableDegrade = false
  #disable
  disable = false
  #unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
  max.commit.retry.timeout = "-1"
  max.rollback.retry.timeout = "-1"
}

store {
  ## store mode: file、db
  mode = "db"

  ## database store
  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 = "123456"
    min-conn = 1
    max-conn = 3
    global.table = "global_table"
    branch.table = "branch_table"
    lock-table = "lock_table"
    query-limit = 100
  }
}

创建数据库 seata

创建表，使用seata提供的，conf/db_store.sql

修改 conf/registry.conf，配置注册中心nacos server

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

  nacos {
    serverAddr = "localhost:8848"
    namespace = ""
    cluster = "default"
  }

启动

先启动Nacos，再启动seata

双击 seata的 bin/seata-server.bat

看到这种提示即为启动成功

image-20240323180020091
image-20240323180020091

登录Nacos Server，查看Seata Server是否注册成功

image-20240323180112591
image-20240323180112591

Seata 分布式事务-应用实例

需求分析

完成下订单功能，由三个微服务模块协同完成, 涉及到多数据库, 多张表

image-20240323180449332
image-20240323180449332

创建数据库和表

-- 订单微服务的数据库
CREATE DATABASE order_micro_service
USE order_micro_service
CREATE TABLE `order`(
id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY, user_id BIGINT DEFAULT NULL , product_id BIGINT DEFAULT NULL , nums INT DEFAULT NULL , money INT DEFAULT NULL, `status` INT DEFAULT NULL COMMENT '0：创建中; 1：已完结' );


-- 库存微服务的数据库`storage``order`
CREATE DATABASE storage_micro_service
USE storage_micro_service
CREATE TABLE `storage`(
id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY, product_id BIGINT DEFAULT NULL , amount INT DEFAULT NULL COMMENT '库存量' );

-- 初始化库存表
INSERT INTO `storage` VALUES(NULL, 1, 10);
SELECT * FROM `storage


-- 账号微服务的数据库
CREATE DATABASE account_micro_service
USE account_micro_service
CREATE TABLE `account`(
id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY , user_id BIGINT DEFAULT NULL , money INT DEFAULT NULL COMMENT '账户金额' );

-- 初始化账户表
INSERT INTO `account` VALUES(NULL, 666, 10000);

分 别 为 3 库 创 建 对 应 的 回 滚 日 志 表 , 说 明 回 滚 日 志 表 在 seata 的 \conf\db_undo_log.sql

-- 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;

开发seata_storage_micro_service-10010微服务

1.创建 seata_storage_micro_service-10010 微服务模块

配置

2.修改 pom.xml

添加相关的 jar 依赖

	    <!--引入相关的依赖-->
    <dependencies>
        <!--引入openfeign starter 即场景启动器-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <!--引入 seata starter -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <exclusions>
                <!--排除自带的seata-all, 引入自己的版本, 否则会出现冲突-->
                <exclusion>
                    <groupId>io.seata</groupId>
                    <artifactId>seata-all</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--引入指定版本的seata-all-->
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <version>0.9.0</version>
        </dependency>

        <!--引入nacos-starter nacos的场景启动starter-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-nacos-discovery</artifactId>
        </dependency>

        <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>

        <!--引入mybatis-starter 整合到springboot-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <!--引入druid-starter-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <!--这里需要我们指定版本, 因为父项目没有-->
            <version>1.1.17</version>
        </dependency>

        <!--引入mysql依赖,使用版本仲裁-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--spring-boot-start-jdbc引入-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!--引入test-starter-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

        <!--引入公共模块e_commerce_center-common-api-->
        <dependency>
            <groupId>com.lzw</groupId>
            <artifactId>e_commerce_center-common-api</artifactId>
            <version>${project.version}</version>
        </dependency>

    </dependencies>

3.创建 application.yml, 进行相关的配置

server:
  port: 10010
spring:
  application:
    name: seata-storage-micro-service
  cloud:
    alibaba:
      seata:
        # 指定事务组名,需要和seata-server中的对应 /conf/file.conf
        tx-service-group: lzw_order_tx_group
    nacos:
      discovery:
        server-addr: localhost:8848 #指定nacos server地址
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/storage_micro_service
    username: root
    password: 123456
#配置seata日志输出
logging:
  level:
    io:
      seata: info
      
mybatis:
  mapperLocations: classpath:mapper/*.xml

4.创建 file.conf放在resources下, 进行相关的配置, 说明：该文件从 seata 的\conf\file.conf 拷贝，进行修改即可

transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  #thread factory for netty
  thread-factory {
    boss-thread-prefix = "NettyBoss"
    worker-thread-prefix = "NettyServerNIOWorker"
    server-executor-thread-prefix = "NettyServerBizHandler"
    share-boss-worker = false
    client-selector-thread-prefix = "NettyClientSelector"
    client-selector-thread-size = 1
    client-worker-thread-prefix = "NettyClientWorkerThread"
    # netty boss thread size,will not be used for UDT
    boss-thread-size = 1
    #auto default pin or 8
    worker-thread-size = 8
  }
  shutdown {
    # when destroy server, wait seconds
    wait = 3
  }
  serialization = "seata"
  compressor = "none"
}
service {
  #vgroup->rgroup
  #vgroup_mapping.my_test_tx_group = "default"
  vgroup_mapping.lzw_order_tx_group = "default"  # 主要是这一行
  #only support single node
  default.grouplist = "127.0.0.1:8091"
  #degrade current not support
  enableDegrade = false
  #disable
  disable = false
  #unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
  max.commit.retry.timeout = "-1"
  max.rollback.retry.timeout = "-1"
}

client {
  async.commit.buffer.limit = 10000
  lock {
    retry.internal = 10
    retry.times = 30
  }
  report.retry.count = 5
  tm.commit.retry.count = 1
  tm.rollback.retry.count = 1
}

## transaction log store
store {
  ## store mode: file、db
  mode = "db"

  ## file store
  file {
    dir = "sessionStore"

    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
    max-branch-session-size = 16384
    # globe session size , if exceeded throws exceptions
    max-global-session-size = 512
    # file buffer size , if exceeded allocate new buffer
    file-write-buffer-cache-size = 16384
    # when recover batch read size
    session.reload.read_size = 100
    # async, sync
    flush-disk-mode = async
  }

  ## database store
  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 = "123456"
    min-conn = 1
    max-conn = 3
    global.table = "global_table"
    branch.table = "branch_table"
    lock-table = "lock_table"
    query-limit = 100
  }
}
lock {
  ## the lock store mode: local、remote
  mode = "remote"

  local {
    ## store locks in user's database
  }

  remote {
    ## store locks in the seata's server
  }
}
recovery {
  #schedule committing retry period in milliseconds
  committing-retry-period = 1000
  #schedule asyn committing retry period in milliseconds
  asyn-committing-retry-period = 1000
  #schedule rollbacking retry period in milliseconds
  rollbacking-retry-period = 1000
  #schedule timeout retry period in milliseconds
  timeout-retry-period = 1000
}

transaction {
  undo.data.validation = true
  undo.log.serialization = "jackson"
  undo.log.save.days = 7
  #schedule delete expired undo_log in milliseconds
  undo.log.delete.period = 86400000
  undo.log.table = "undo_log"
}

## metrics settings
metrics {
  enabled = false
  registry-type = "compact"
  # multi exporters use comma divided
  exporter-list = "prometheus"
  exporter-prometheus-port = 9898
}

support {
  ## spring
  spring {
    # auto proxy the DataSource bean
    datasource.autoproxy = false
  }
}

4.创建 registry.conf, 进行相关的配置, 说明：该文件从 seata 的\conf\registry.conf 拷贝，进行修改即可

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"
  }
}

Dao层

5.创建 /entity/Storage.java

package com.lzw.springcloud.entity;

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

/**
 * @author LiAng
 * Storage 实体类对应 storage表
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Storage {
    private Long id;
    private Long productId;
    private Integer amount;
}

6.创建 /dao/StorageDao.java

package com.lzw.springcloud.dao;

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

/**
 * @author LiAng
 */
@Mapper
public interface StorageDao {
    //扣减库存信息
    void reduce(@Param("productId") Long productId, @Param("nums") Integer nums);
}

7.resources/mapper/StorageMapper.xml

<?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.lzw.springcloud.dao.StorageDao">

    <resultMap id="BaseResultMap" type="com.lzw.springcloud.entity.Storage">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="product_id" property="productId" jdbcType="BIGINT"/>
        <result column="amount" property="amount" jdbcType="INTEGER"/>
    </resultMap>
    <!-- 减少库存 -->
    <update id="reduce">
        UPDATE
            storage
        SET
            amount = amount - #{nums}
        WHERE
            product_id = #{productId}
    </update>

</mapper>

Service层

8.创建 /service/StorageService.java

package com.lzw.springcloud.service;

/**
 * @author LiAng
 */
public interface StorageService {
    // 扣减库存
    void reduce(Long produceId, Integer nums);
}

9.创建/service/impl/StorageServiceImpl.java

package com.lzw.springcloud.service.impl;

import com.lzw.springcloud.dao.StorageDao;
import com.lzw.springcloud.service.StorageService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * @author LiAng
 */
@Service
@Slf4j
public class StorageServiceImpl implements StorageService {
    @Resource
    private StorageDao storageDao;

    @Override
    public void reduce(Long productId, Integer nums) {
        log.info("==========seata_storage_micro_service-10010 扣减库存 start==========");
        storageDao.reduce(productId, nums);
        log.info("==========seata_storage_micro_service-10010 扣减库存 end==========");

    }
}

Controller层

10.创建 /controller/StorageController.java

package com.lzw.springcloud.controller;

import com.lzw.springcloud.entity.Result;
import com.lzw.springcloud.service.StorageService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * @author LiAng
 */
@RestController
public class StorageController {

    @Resource
    private StorageService storageService;

    //扣减库存
    @PostMapping("/storage/reduce")
    public Result reduce(@RequestParam("productId") Long productId, @RequestParam("nums") Integer nums) {
        storageService.reduce(productId, nums);
        return Result.success("扣减库存成功ok", null);
    }
}

两个配置类

11.创建/config/MyBatisConfig.java

package com.lzw.springcloud.config;

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

/**
 * @author LiAng
 * 常规配置 Mybatis 和 dao关联
 */
@Configuration
@MapperScan({"com.lzw.springcloud.dao"})
public class MyBatisConfig {
}

12.创建/config/DataSourceProxyConfig.java

package com.lzw.springcloud.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;

/**
 * @author LiAng
 * 1. 这里很重要: 配置数据源的代理是seata 也就是使用seata代理数据源
 * 2. DataSourceProxy 是引入的 io.seata.rm.datasource
 */
@Configuration
public class DataSourceProxyConfig {

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

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

    //配置DataSourceProxy- 使用seata代理数据源
    @Bean
    public DataSourceProxy dataSourceProxy(DataSource dataSource){
        return new DataSourceProxy(dataSource);
    }

    //配置SqlSessionFactory-常规写法
    @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();
    }

}

创建主启动类

13.创建主启动类SeataStorageMicroServiceApplication10010.java

package com.lzw.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

/**
 * @author LiAng
 */
//注意: 需要取消数据源的自动配置
//而是使用seata 代理数据源, DataSourceProxy
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@EnableDiscoveryClient
@EnableFeignClients
public class SeataStorageMicroServiceApplication10010 {
    public static void main(String[] args) {
        SpringApplication.run(SeataStorageMicroServiceApplication10010.class,args);
    }
}

测试

启动Nacos Server8848

启动Seata

启动该模块

登录 Nacos Server, 查看 10010 微服务是否注册成功

image-20240323202608134
image-20240323202608134

开发seata_account_micro_service-10012微服务

1.创建 seata_account_micro_service-10012 微服务模块

配置

2.修改 pom.xml, 添加相关的 jar 依赖

<!--引入相关的依赖-->
    <dependencies>
        <!--引入openfeign starter 即场景启动器-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <!--引入 seata starter -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <exclusions>
                <!--排除自带的seata-all, 引入自己的版本, 否则会出现冲突-->
                <exclusion>
                    <groupId>io.seata</groupId>
                    <artifactId>seata-all</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--引入指定版本的seata-all-->
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <version>0.9.0</version>
        </dependency>

        <!--引入nacos-starter nacos的场景启动starter-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-nacos-discovery</artifactId>
        </dependency>

        <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>

        <!--引入mybatis-starter 整合到springboot-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <!--引入druid-starter-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <!--这里需要我们指定版本, 因为父项目没有-->
            <version>1.1.17</version>
        </dependency>

        <!--引入mysql依赖,使用版本仲裁-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--spring-boot-start-jdbc引入-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!--引入test-starter-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

        <!--引入公共模块e_commerce_center-common-api-->
        <dependency>
            <groupId>com.lzw</groupId>
            <artifactId>e_commerce_center-common-api</artifactId>
            <version>${project.version}</version>
        </dependency>

    </dependencies>

3.创建 application.yml, 进行相关的配置

server:
  port: 10012
spring:
  application:
    name: seata-account-micro-service
  cloud:
    alibaba:
      seata:
        # 指定事务组名,需要和seata-server中的对应 /conf/file.conf
        tx-service-group: lzw_order_tx_group
    nacos:
      discovery:
        server-addr: localhost:8848 #指定nacos server地址
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/account_micro_service
    username: root
    password: 123456
#配置seata日志输出
logging:
  level:
    io:
      seata: info

mybatis:
  mapperLocations: classpath:mapper/*.xml

4.创建 file.conf, 进行相关的配置, 说明：该文件从 seata 的\conf\file.conf 拷贝，进行修改即可

transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  #thread factory for netty
  thread-factory {
    boss-thread-prefix = "NettyBoss"
    worker-thread-prefix = "NettyServerNIOWorker"
    server-executor-thread-prefix = "NettyServerBizHandler"
    share-boss-worker = false
    client-selector-thread-prefix = "NettyClientSelector"
    client-selector-thread-size = 1
    client-worker-thread-prefix = "NettyClientWorkerThread"
    # netty boss thread size,will not be used for UDT
    boss-thread-size = 1
    #auto default pin or 8
    worker-thread-size = 8
  }
  shutdown {
    # when destroy server, wait seconds
    wait = 3
  }
  serialization = "seata"
  compressor = "none"
}
service {
  #vgroup->rgroup
  #vgroup_mapping.my_test_tx_group = "default"
  vgroup_mapping.lzw_order_tx_group = "default"  # 主要是这一行
  #only support single node
  default.grouplist = "127.0.0.1:8091"
  #degrade current not support
  enableDegrade = false
  #disable
  disable = false
  #unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
  max.commit.retry.timeout = "-1"
  max.rollback.retry.timeout = "-1"
}

client {
  async.commit.buffer.limit = 10000
  lock {
    retry.internal = 10
    retry.times = 30
  }
  report.retry.count = 5
  tm.commit.retry.count = 1
  tm.rollback.retry.count = 1
}

## transaction log store
store {
  ## store mode: file、db
  mode = "db"

  ## file store
  file {
    dir = "sessionStore"

    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
    max-branch-session-size = 16384
    # globe session size , if exceeded throws exceptions
    max-global-session-size = 512
    # file buffer size , if exceeded allocate new buffer
    file-write-buffer-cache-size = 16384
    # when recover batch read size
    session.reload.read_size = 100
    # async, sync
    flush-disk-mode = async
  }

  ## database store
  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 = "123456"
    min-conn = 1
    max-conn = 3
    global.table = "global_table"
    branch.table = "branch_table"
    lock-table = "lock_table"
    query-limit = 100
  }
}
lock {
  ## the lock store mode: local、remote
  mode = "remote"

  local {
    ## store locks in user's database
  }

  remote {
    ## store locks in the seata's server
  }
}
recovery {
  #schedule committing retry period in milliseconds
  committing-retry-period = 1000
  #schedule asyn committing retry period in milliseconds
  asyn-committing-retry-period = 1000
  #schedule rollbacking retry period in milliseconds
  rollbacking-retry-period = 1000
  #schedule timeout retry period in milliseconds
  timeout-retry-period = 1000
}

transaction {
  undo.data.validation = true
  undo.log.serialization = "jackson"
  undo.log.save.days = 7
  #schedule delete expired undo_log in milliseconds
  undo.log.delete.period = 86400000
  undo.log.table = "undo_log"
}

## metrics settings
metrics {
  enabled = false
  registry-type = "compact"
  # multi exporters use comma divided
  exporter-list = "prometheus"
  exporter-prometheus-port = 9898
}

support {
  ## spring
  spring {
    # auto proxy the DataSource bean
    datasource.autoproxy = false
  }
}

5.创建 registry.conf, 进行相关的配置, 说明：该文件从 seata 的\conf\registry.conf 拷贝，进行修改即可

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"
  }
}

Dao层

6.创建 /entity/Account.java

package com.lzw.springcloud.entity;

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

/**
 * @author LiAng
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Account {
    private Long id;
    private Long userId;
    private Integer money;

}

7.创建 /dao/AccountDao.java

package com.lzw.springcloud.dao;

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

/**
 * @author LiAng
 */
@Mapper
public interface AccountDao {
    void reduce(@Param("userId") Long userId, @Param("money") Integer money);
}

8.创建 resources/mapper/AccountMapper.xml

<?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.lzw.springcloud.dao.AccountDao">

    <resultMap id="BaseResultMap" type="com.lzw.springcloud.entity.Account">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="user_id" property="userId" jdbcType="BIGINT"/>
        <result column="money" property="money" jdbcType="INTEGER"/>

    </resultMap>

    <!-- 扣减金额用户account表的money -->
    <update id="reduce">
        UPDATE account
        SET
            money = money - #{money}
        WHERE
            user_id = #{userId};
    </update>

</mapper>

Service层

9.创建 /service/AccountService.java

package com.lzw.springcloud.service;

/**
 * @author LiAng
 */
public interface AccountService {
    //扣减用户的money
    void reduce(Long userId, Integer money);
}

10.创建 /service/impl/AccountServiceImpl.java

package com.lzw.springcloud.service.impl;

import com.lzw.springcloud.dao.AccountDao;
import com.lzw.springcloud.service.AccountService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * @author LiAng
 */
@Service
@Slf4j
public class AccountServiceImpl implements AccountService {
    @Resource
    AccountDao accountDao;

    @Override
    public void reduce(Long userId, Integer money) {
        log.info("========seata_account_micro_service-10012 扣减账户余额 start ======");
        accountDao.reduce(userId, money);
        log.info("========seata_account_micro_service-10012 扣减账户余额 end ======");
    }
}

Controller层

11.创建 /controller/AccountController.java

package com.lzw.springcloud.controller;

import com.lzw.springcloud.entity.Result;
import com.lzw.springcloud.service.AccountService;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * @author LiAng
 */
@RestController
public class AccountController {
    @Resource
    AccountService accountService;

    /**
     * 扣减账户余额
     */
    @PostMapping("/account/reduce")
    public Result reduce(@RequestParam("userId") Long userId, @RequestParam("money") Integer money){
        accountService.reduce(userId, money);
        return Result.success("200", "扣减账户余额OK");
    }
}

两个配置类

12.创建 /config/MyBatisConfig.java

package com.lzw.springcloud.config;

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

/**
 * @author LiAng
 * 常规配置 Mybatis 和 dao关联
 */
@Configuration
@MapperScan({"com.lzw.springcloud.dao"})
public class MyBatisConfig {
}

13.创建 /config/DataSourceProxyConfig.java ,

package com.lzw.springcloud.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;

/**
 * @author LiAng
 * 1. 这里很重要: 配置数据源的代理是seata 也就是使用seata代理数据源
 * 2. DataSourceProxy 是引入的 io.seata.rm.datasource
 */
@Configuration
public class DataSourceProxyConfig {

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

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

    //配置DataSourceProxy- 使用seata代理数据源
    @Bean
    public DataSourceProxy dataSourceProxy(DataSource dataSource){
        return new DataSourceProxy(dataSource);
    }

    //配置SqlSessionFactory-常规写法
    @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();
    }

}

创建主启动类

  1. 创建 SeataAccountMicroServiceApplication10012.java
package com.lzw.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

/**
 * @author LiAng
 */
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@EnableFeignClients
@EnableDiscoveryClient
public class SeataAccountMicroServiceApplication10012 {
    public static void main(String[] args) {
        SpringApplication.run(SeataAccountMicroServiceApplication10012.class,args);
    }
}

测试

启动Nacos Server8848

启动Seata

启动该模块

登录 Nacos Server, 查看 10012 微服务是否注册成功

image-20240324091451147
image-20240324091451147

开发seata_order_micro_service-10008微服务

1.创建 seata_order_micro_service-10008 微服务模块

配置

2.修改 pom.xml, 添加相关的 jar 依赖

    <!--引入相关的依赖-->
    <dependencies>
        <!--引入openfeign starter 即场景启动器-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <!--引入 seata starter -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <exclusions>
                <!--排除自带的seata-all, 引入自己的版本, 否则会出现冲突-->
                <exclusion>
                    <groupId>io.seata</groupId>
                    <artifactId>seata-all</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--引入指定版本的seata-all-->
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <version>0.9.0</version>
        </dependency>

        <!--引入nacos-starter nacos的场景启动starter-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-nacos-discovery</artifactId>
        </dependency>

        <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>

        <!--引入mybatis-starter 整合到springboot-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <!--引入druid-starter-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <!--这里需要我们指定版本, 因为父项目没有-->
            <version>1.1.17</version>
        </dependency>

        <!--引入mysql依赖,使用版本仲裁-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--spring-boot-start-jdbc引入-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!--引入test-starter-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

        <!--引入公共模块e_commerce_center-common-api-->
        <dependency>
            <groupId>com.lzw</groupId>
            <artifactId>e_commerce_center-common-api</artifactId>
            <version>${project.version}</version>
        </dependency>

    </dependencies>

3.创建 application.yml, 进行相关的配置

server:
  port: 10008
spring:
  application:
    name: seata-order-micro-service
  cloud:
    alibaba:
      seata:
        # 指定事务组名,需要和seata-server中的对应 /conf/file.conf
        tx-service-group: lzw_order_tx_group
    nacos:
      discovery:
        server-addr: localhost:8848 #指定nacos server地址
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/order_micro_service
    username: root
    password: 123456
#配置seata日志输出
logging:
  level:
    io:
      seata: info

mybatis:
  mapperLocations: classpath:mapper/*.xml

4.创建 file.conf, 进行相关的配置, 说明：该文件从 seata 的\conf\file.conf 拷贝，进行修改即可

transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  #thread factory for netty
  thread-factory {
    boss-thread-prefix = "NettyBoss"
    worker-thread-prefix = "NettyServerNIOWorker"
    server-executor-thread-prefix = "NettyServerBizHandler"
    share-boss-worker = false
    client-selector-thread-prefix = "NettyClientSelector"
    client-selector-thread-size = 1
    client-worker-thread-prefix = "NettyClientWorkerThread"
    # netty boss thread size,will not be used for UDT
    boss-thread-size = 1
    #auto default pin or 8
    worker-thread-size = 8
  }
  shutdown {
    # when destroy server, wait seconds
    wait = 3
  }
  serialization = "seata"
  compressor = "none"
}
service {
  #vgroup->rgroup
  #vgroup_mapping.my_test_tx_group = "default"
  vgroup_mapping.lzw_order_tx_group = "default"  # 主要是这一行
  #only support single node
  default.grouplist = "127.0.0.1:8091"
  #degrade current not support
  enableDegrade = false
  #disable
  disable = false
  #unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
  max.commit.retry.timeout = "-1"
  max.rollback.retry.timeout = "-1"
}

client {
  async.commit.buffer.limit = 10000
  lock {
    retry.internal = 10
    retry.times = 30
  }
  report.retry.count = 5
  tm.commit.retry.count = 1
  tm.rollback.retry.count = 1
}

## transaction log store
store {
  ## store mode: file、db
  mode = "db"

  ## file store
  file {
    dir = "sessionStore"

    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
    max-branch-session-size = 16384
    # globe session size , if exceeded throws exceptions
    max-global-session-size = 512
    # file buffer size , if exceeded allocate new buffer
    file-write-buffer-cache-size = 16384
    # when recover batch read size
    session.reload.read_size = 100
    # async, sync
    flush-disk-mode = async
  }

  ## database store
  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 = "123456"
    min-conn = 1
    max-conn = 3
    global.table = "global_table"
    branch.table = "branch_table"
    lock-table = "lock_table"
    query-limit = 100
  }
}
lock {
  ## the lock store mode: local、remote
  mode = "remote"

  local {
    ## store locks in user's database
  }

  remote {
    ## store locks in the seata's server
  }
}
recovery {
  #schedule committing retry period in milliseconds
  committing-retry-period = 1000
  #schedule asyn committing retry period in milliseconds
  asyn-committing-retry-period = 1000
  #schedule rollbacking retry period in milliseconds
  rollbacking-retry-period = 1000
  #schedule timeout retry period in milliseconds
  timeout-retry-period = 1000
}

transaction {
  undo.data.validation = true
  undo.log.serialization = "jackson"
  undo.log.save.days = 7
  #schedule delete expired undo_log in milliseconds
  undo.log.delete.period = 86400000
  undo.log.table = "undo_log"
}

## metrics settings
metrics {
  enabled = false
  registry-type = "compact"
  # multi exporters use comma divided
  exporter-list = "prometheus"
  exporter-prometheus-port = 9898
}

support {
  ## spring
  spring {
    # auto proxy the DataSource bean
    datasource.autoproxy = false
  }
}

5.创建 registry.conf, 进行相关的配置, 说明：该文件从 seata 的\conf\registry.conf 拷贝，进行修改即可

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"
  }
}

Dao层

6.创建 /entity/Order.java

package com.lzw.springcloud.entity;

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

/**
 * @author LiAng
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Order {
    private Long id;
    private Long userId;
    private Long productId;
    private Integer nums;
    private Integer money;
    private Integer status;

}

7.创建/dao/OrderDao.java

package com.lzw.springcloud.dao;

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

/**
 * @author LiAng
 * @time 2024/3/24 9:26
 */
@Mapper
public interface OrderDao {
    //新建订单
    void save(Order order);
    //修改订单状态
    void update(@Param("userId") Long userId, @Param("status") Integer status);

}

8.创建 resources/mapper/OrderMapper.xml

<?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.lzw.springcloud.dao.OrderDao">

    <resultMap id="BaseResultMap" type="com.lzw.springcloud.entity.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="nums" property="nums" jdbcType="INTEGER"/>
        <result column="money" property="money" jdbcType="INTEGER"/>
        <result column="status" property="status" jdbcType="INTEGER"/>
    </resultMap>
    <!--配置实现save方法 添加订单 -->
    <insert id="save">
        insert into `order` (id,user_id,product_id,nums,money,status)
        values (null,#{userId},#{productId},#{nums},#{money},0);
    </insert>

    <!--配置实现update- 修改订单状态 这里写的比较简单，实际工作中根据业务需求编写即可-->
    <update id="update">
        update `order` set status = 1
        where user_id=#{userId} and status = #{status};
    </update>

</mapper>

Service层

9.创建/service/OrderService.java

package com.lzw.springcloud.service;

import com.lzw.springcloud.entity.Order;

/**
 * @author LiAng
 */
public interface OrderService {
    void save(Order order);
}

10.创建/service/AccountService.java

package com.lzw.springcloud.service;

import com.lzw.springcloud.entity.Result;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * @author LiAng
 */
@FeignClient(value = "seata-account-micro-service")
public interface AccountService {
    /**
     * 1. 远程调用方式是 post
     * 2. 远程调用的url 为 http://seata_account_micro_service/account/reduce
     * 3. seata_account_micro_service是nacos注册中心服务名
     * 4. openfeign是通过接口方式调用服务
     */
    /**
     * 扣减账户余额
     */
    @PostMapping("/account/reduce")
    public Result reduce(@RequestParam("userId") Long userId, @RequestParam("money") Integer money);
}

11.创建 /service/StorageService.java

package com.lzw.springcloud.service;

import com.lzw.springcloud.entity.Result;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * @author LiAng
 */
@FeignClient(value = "seata-storage-micro-service")
public interface StorageService {
    /**
     * 1. 远程调用方式是 post
     * 2. 远程调用的url 为 http://seata_storage_micro_service/storage/reduce
     * 3. seata_storage_micro_service是nacos注册中心服务名
     * 4. openfeign是通过接口方式调用服务
     */
    //扣减库存
    @PostMapping("/storage/reduce")
    public Result reduce(@RequestParam("productId") Long productId, @RequestParam("nums") Integer nums);
}

12.创建/impl/OrderServiceImpl.java

package com.lzw.springcloud.service.impl;

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

import javax.annotation.Resource;

/**
 * @author LiAng
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Resource
    private OrderDao orderDao;

    @Resource
    private StorageService storageService;

    @Resource
    private AccountService accountService;

    @Override
    public void save(Order order) {
        log.info("====创建订单 start=====");

        log.info("====本地生成订单 start===");
        orderDao.save(order);
        log.info("====本地生成订单 end===");

        log.info("====扣减库存 start===");
        //远程调用storage微服务扣减库存
        storageService.reduce(order.getProductId(),order.getNums());
        log.info("====扣减库存 end===");

        log.info("====扣减用户余额 start===");
        //远程调用account微服务扣减用户money
        accountService.reduce(order.getUserId(),order.getMoney());
        log.info("====扣减用户余额 end===");

        log.info("====本地修改订单状态 start===");
        //调用本地方法修改订单状态0->1
        orderDao.update(order.getUserId(), 0);
        log.info("====本地修改订单状态 end===");

        log.info("====创建订单 end=====");

    }
}

Controller层

13.创建/controller/OrderController.java

package com.lzw.springcloud.controller;

import com.lzw.springcloud.entity.Order;
import com.lzw.springcloud.entity.Result;
import com.lzw.springcloud.service.OrderService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * @author LiAng
 */
@RestController
public class OrderController {
    @Resource
    private OrderService orderService;

    /**
     * 1. 我们的前端如果是以json格式来发送添加信息Order， 那么我们需要使用@RequestBody
     *     才能将数据封装到对应的bean, 同时保证http的请求头的 content-type是对应
     * 2. 如果前端是以表单形式提交了，则不需要使用@RequestBody, 才会进行对象参数封装, 同时保证
     *      http的请求头的 content-type是对应
     */
    @GetMapping("/order/save")
    public Result save(Order order) {
        orderService.save(order);
        return Result.success("订单创建成功", null);
    }
}

两个配置类

14.创建 /config/MyBatisConfig.java

package com.lzw.springcloud.config;

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

/**
 * @author LiAng
 * 常规配置 Mybatis 和 dao关联
 */
@Configuration
@MapperScan({"com.lzw.springcloud.dao"})
public class MyBatisConfig {
}

15.创建 /config/DataSourceProxyConfig.java

package com.lzw.springcloud.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;

/**
 * @author LiAng
 * 1. 这里很重要: 配置数据源的代理是seata 也就是使用seata代理数据源
 * 2. DataSourceProxy 是引入的 io.seata.rm.datasource
 */
@Configuration
public class DataSourceProxyConfig {

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

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

    //配置DataSourceProxy- 使用seata代理数据源
    @Bean
    public DataSourceProxy dataSourceProxy(DataSource dataSource){
        return new DataSourceProxy(dataSource);
    }

    //配置SqlSessionFactory-常规写法
    @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();
    }

}

创建主启动类

16.创建 SeataOrderMicroServiceApplication10008.java

package com.lzw.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

/**
 * @author LiAng
 */
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@EnableDiscoveryClient
@EnableFeignClients
public class SeataOrderMicroServiceApplication10008 {
    public static void main(String[] args) {
        SpringApplication.run
                (SeataOrderMicroServiceApplication10008.class,args);
    }
}

测试

启动Nacos Server8848

启动Seata

启动该模块

登录 Nacos Server, 查看 10008 微服务是否注册成功

image-20240324094807598
image-20240324094807598

逻辑梳理

image-20240324093326845
image-20240324093326845

集成测试1-正常

测试

启动Nacos Server8848

启动Seata

启动三个微服务

浏览器访问: http://localhost:10008/order/save?userId=666&productId=1&nums=1&money=100

image-20240324101132602
image-20240324101132602

查看数据库/表的情况是否正常, 结论：如果没有异常出现，正常下单，数据库三张表数据一致性是 OK 的

注意事项和细节

1.MySQL 出现 too many connections（1040）错误解决方法

max_connections=1000

2.如果出现: service id not legal hostname

报错 Service id not legal hostname 的原因是服务名称不能带有下划线，可以使用中划线，springcloud 无法识别下划线，把下划线改成中划线就好

集成测试2-模拟异常

修改

修改 seata_account_micro_service-10012 的AccountController.java

package com.lzw.springcloud.controller;

import com.lzw.springcloud.entity.Result;
import com.lzw.springcloud.service.AccountService;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;

/**
 * @author LiAng
 */
@RestController
public class AccountController {
    @Resource
    AccountService accountService;

    /**
     * 扣减账户余额
     */
    @PostMapping("/account/reduce")
    public Result reduce(@RequestParam("userId") Long userId, @RequestParam("money") Integer money){
        try {
            TimeUnit.SECONDS.sleep(12);
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }

        accountService.reduce(userId, money);
        return Result.success("200", "扣减账户余额OK");
    }
}

测试

启动Nacos Server8848

启动Seata

重新启动三个微服务

浏览器访问: http://localhost:10008/order/save?userId=666&productId=1&nums=1&money=100

image-20240324101737271
image-20240324101737271

查看数据库/表的情况是否正常, 结论：这时数据库/表，出现数据不一致现象, 订单是0未完成，但是库存减少了，账号钱也扣了(提示: 等休眠时间完成后，再查看 account 表，会看到数据不一致.)

集成测试3-分布式事务控制

修改

修改seata_account_micro_service-10012 的AccountController.java

package com.lzw.springcloud.controller;

import com.lzw.springcloud.entity.Result;
import com.lzw.springcloud.service.AccountService;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;

/**
 * @author LiAng
 */
@RestController
public class AccountController {
    @Resource
    AccountService accountService;

    /**
     * 扣减账户余额
     */
    @PostMapping("/account/reduce")
    public Result reduce(@RequestParam("userId") Long userId, @RequestParam("money") Integer money){
        try {
            TimeUnit.SECONDS.sleep(12);
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }

        accountService.reduce(userId, money);
        return Result.success("200", "扣减账户余额OK");
    }
}

修改 seata-order-micro-service-10008 的 OrderServiceImpl.java

使用@GlobalTransactional 控制分布式事务，保证数据一致性

package com.lzw.springcloud.service.impl;

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

import javax.annotation.Resource;

/**
 * @author LiAng
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Resource
    private OrderDao orderDao;

    @Resource
    private StorageService storageService;

    @Resource
    private AccountService accountService;

    @Override
    /**
     * 1. @GlobalTransactional : 分布式全局事务控制  io.seata.spring.annotation包
     * 2. name = "lzw-save-order" 名称，程序员自己指定,保证唯一即可
     * 3. rollbackFor = Exception.class 指定发送什么异常就回滚, 这里我们指定的是Exception.class
     *    即 只要发生了异常就回滚
     */
    @GlobalTransactional(name = "lzw-save-order", rollbackFor = Exception.class)
    public void save(Order order) {
        log.info("====创建订单 start=====");

        log.info("====本地生成订单 start===");
        orderDao.save(order);
        log.info("====本地生成订单 end===");

        log.info("====扣减库存 start===");
        //远程调用storage微服务扣减库存
        storageService.reduce(order.getProductId(),order.getNums());
        log.info("====扣减库存 end===");

        log.info("====扣减用户余额 start===");
        //远程调用account微服务扣减用户money
        accountService.reduce(order.getUserId(),order.getMoney());
        log.info("====扣减用户余额 end===");

        log.info("====本地修改订单状态 start===");
        //调用本地方法修改订单状态0->1
        orderDao.update(order.getUserId(), 0);
        log.info("====本地修改订单状态 end===");

        log.info("====创建订单 end=====");

    }
}

测试

启动Nacos Server8848

启动Seata

重新启动三个微服务

浏览器访问: http://localhost:10008/order/save?userId=666&productId=1&nums=1&money=100

访问数据库会发现没有任何订单生成，库存也没变化，帐户余额也没变化

上次编辑于: 2024/3/24 14:30:01
贡献者: LiAng