分布式事务(四)Seata AT模式-Spring Cloud微服务案例

JayX

项目源码: https://gitee.com/benwang6/se...

一、订单业务案例

1.1 创建 Empty Project:seata-at

先新建文件夹 seata-samples,后面测试的 Seata AT 和 Seata TCC 模式都放在该目录下。

接着创建 seata-at 项目:

选择 Empty Project

image.png

填写项目名 seata-at 和存放目录,存放在你新建的 seata-samples 目录下:

image.png

1.2 数据库初始化工具

订单案例涉及四个数据库:

image.png

为了后续测试方便我们编写一个工具,用来重置所有数据库表,可以方便地把数据重置到初始状态。

1.3 新建Module:db-init

新建 Module,选择 Spring Initializr

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填写 Group 和 Artifact,其他选项默认即可:

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添加 JDBCMySQL Driver 依赖:

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完成后,pom.xml 文件如下:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.tedu</groupId>
    <artifactId>db-init</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>db-init</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

1.4 application.yml 配置

项目的 application.properties 文件改名成 application.yml,然后添加 mysql 连接配置:

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost/?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
    username: root
    password: root

注意: 在连接地址中没有指定库名,是因为我们要先后连接四个数据库,后面执行的 sql 脚本文件中会执行 use 来进行数据库切换。

1.5 添加 sql 脚本文件

案例中的 sql 脚本来自不同的项目:

seata 库
seata 库是 Seata Server (TC,全局事务协调器)使用的数据库,建表语句来自这里:https://github.com/seata/seat...

order、storage和account库中的 undo_log 表
undo_log 表是各分支事务用来记录回滚日志的表,建表语句来自这里:https://github.com/seata/seat...

order、storage和account表
这个案例项目是 Seata 官方案例,我少做了一些改动。案例用的建表语句来自这里:https://github.com/seata/seat...,在各项目的 resources 目录中的 sql 文件。

order库中的 segment 表
EasyIdGenerator 是一个非常简单易用的全局唯一id发号器,他支持数据库自增id方式和雪花算法,由于雪花算法需要用到zookeeper服务器,为了简便起见,我们使用数据库自增id的方式。segment 表就来自这个开源项目,项目地址:https://github.com/lookingats...

下面,在 resources 目录下,先新建一个 sql 文件夹,四个 sql 脚本文件放在 sql 文件夹下:

image.png

seata-server.sql

drop database if exists `seata`;

CREATE DATABASE `seata` CHARSET utf8;
use `seata`;

-- -------------------------------- 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_gmt_modified_status` (`gmt_modified`, `status`),
KEY `idx_transaction_id` (`transaction_id`)
) ENGINE = InnoDB
DEFAULT CHARSET = utf8;

-- 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 = utf8;

-- the table to store lock data
CREATE TABLE IF NOT EXISTS `lock_table`
(
`row_key`        VARCHAR(128) NOT NULL,
`xid`            VARCHAR(96),
`transaction_id` BIGINT,
`branch_id`      BIGINT       NOT NULL,
`resource_id`    VARCHAR(256),
`table_name`     VARCHAR(32),
`pk`             VARCHAR(36),
`gmt_create`     DATETIME,
`gmt_modified`   DATETIME,
PRIMARY KEY (`row_key`),
KEY `idx_branch_id` (`branch_id`)
) ENGINE = InnoDB
DEFAULT CHARSET = utf8;

order.sql

drop database if exists `seata_order`;

CREATE DATABASE `seata_order` charset utf8;

use `seata_order`;


CREATE TABLE `order` (
  `id` bigint(11) NOT NULL,
  `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',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

ALTER TABLE `order` ADD COLUMN `status` int(1) DEFAULT NULL COMMENT '订单状态:0:创建中;1:已完结' AFTER `money` ;

-- for AT mode you must to init this sql for you business database. the seata server not need it.
CREATE TABLE IF NOT EXISTS `undo_log`
(
    `branch_id`     BIGINT(20)   NOT NULL COMMENT 'branch transaction id',
    `xid`           VARCHAR(100) NOT NULL COMMENT 'global transaction id',
    `context`       VARCHAR(128) NOT NULL COMMENT 'undo_log context,such as serialization',
    `rollback_info` LONGBLOB     NOT NULL COMMENT 'rollback info',
    `log_status`    INT(11)      NOT NULL COMMENT '0:normal status,1:defense status',
    `log_created`   DATETIME(6)  NOT NULL COMMENT 'create datetime',
    `log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',
    UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 1
  DEFAULT CHARSET = utf8 COMMENT ='AT transaction mode undo table';

CREATE TABLE IF NOT EXISTS segment
(
    id            BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY COMMENT '自增主键',
    VERSION       BIGINT      DEFAULT 0  NOT NULL COMMENT '版本号',
    business_type VARCHAR(63) DEFAULT '' NOT NULL COMMENT '业务类型,唯一',
    max_id        BIGINT      DEFAULT 0  NOT NULL COMMENT '当前最大id',
    step          INT         DEFAULT 0  NULL COMMENT '步长',
    increment     INT         DEFAULT 1  NOT NULL COMMENT '每次id增量',
    remainder     INT         DEFAULT 0  NOT NULL COMMENT '余数',
    created_at    BIGINT UNSIGNED        NOT NULL COMMENT '创建时间',
    updated_at    BIGINT UNSIGNED        NOT NULL COMMENT '更新时间',
    CONSTRAINT uniq_business_type UNIQUE (business_type)
) CHARSET = utf8mb4
  ENGINE INNODB COMMENT '号段表';


INSERT INTO segment
(VERSION, business_type, max_id, step, increment, remainder, created_at, updated_at)
VALUES (1, 'order_business', 1000, 1000, 1, 0, NOW(), NOW());

storage.sql

drop database  if exists `seata_storage`;

CREATE DATABASE `seata_storage` charset utf8;

use `seata_storage`;


CREATE TABLE `storage` (
  `id` bigint(11) NOT NULL AUTO_INCREMENT,
  `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',
  `frozen` int(11) DEFAULT '0' COMMENT 'TCC事务锁定的库存',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

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

-- for AT mode you must to init this sql for you business database. the seata server not need it.
CREATE TABLE IF NOT EXISTS `undo_log`
(
    `branch_id`     BIGINT(20)   NOT NULL COMMENT 'branch transaction id',
    `xid`           VARCHAR(100) NOT NULL COMMENT 'global transaction id',
    `context`       VARCHAR(128) NOT NULL COMMENT 'undo_log context,such as serialization',
    `rollback_info` LONGBLOB     NOT NULL COMMENT 'rollback info',
    `log_status`    INT(11)      NOT NULL COMMENT '0:normal status,1:defense status',
    `log_created`   DATETIME(6)  NOT NULL COMMENT 'create datetime',
    `log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',
    UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 1
  DEFAULT CHARSET = utf8 COMMENT ='AT transaction mode undo table';

account.sql

drop database  if exists `seata_account`;

CREATE DATABASE `seata_account` charset utf8;

use `seata_account`;

CREATE TABLE `account` (
  `id` bigint(11) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `user_id` bigint(11) UNIQUE 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',
  `frozen` decimal(10,0) DEFAULT '0' COMMENT 'TCC事务锁定的金额',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

INSERT INTO `seata_account`.`account` (`id`, `user_id`, `total`, `used`, `residue`) VALUES ('1', '1', '1000', '0', '1000');

-- for AT mode you must to init this sql for you business database. the seata server not need it.
CREATE TABLE IF NOT EXISTS `undo_log`
(
    `branch_id`     BIGINT(20)   NOT NULL COMMENT 'branch transaction id',
    `xid`           VARCHAR(100) NOT NULL COMMENT 'global transaction id',
    `context`       VARCHAR(128) NOT NULL COMMENT 'undo_log context,such as serialization',
    `rollback_info` LONGBLOB     NOT NULL COMMENT 'rollback info',
    `log_status`    INT(11)      NOT NULL COMMENT '0:normal status,1:defense status',
    `log_created`   DATETIME(6)  NOT NULL COMMENT 'create datetime',
    `log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',
    UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 1
  DEFAULT CHARSET = utf8 COMMENT ='AT transaction mode undo table';

1.6 主程序中添加代码,执行sql脚本

Spring 中提供了一个 jdbc 脚本执行器,使用这个工具可以非常方便的运行一个 sql 脚本文件,下面是这个方法:

ScriptUtils.executeSqlScript()

只需要传入它需要的参数即可。

下面代码运行 sql 目录中的四个脚本程序,每次运行都会删除四个数据库再重新创建,并初始化数据。

package cn.tedu.dbinit;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.jdbc.datasource.init.ScriptUtils;

import javax.annotation.PostConstruct;
import javax.sql.DataSource;
import java.sql.SQLException;

@SpringBootApplication
public class DbInitApplication {

    @Autowired
    private DataSource dataSource;

    public static void main(String[] args) {
        SpringApplication.run(DbInitApplication.class, args);
    }

    @PostConstruct
    public void init() throws SQLException {
        exec(dataSource, "sql/account.sql");
        exec(dataSource, "sql/storage.sql");
        exec(dataSource, "sql/order.sql");
        exec(dataSource, "sql/seata-server.sql");
    }

    private void exec(DataSource accountDatasource, String script) throws SQLException {
        ClassPathResource rc = new ClassPathResource(script, DbInitApplication.class.getClassLoader());
        EncodedResource er = new EncodedResource(rc, "utf-8");
        ScriptUtils.executeSqlScript(accountDatasource.getConnection(), er);
    }
}

二、eureka注册中心

2.1 新建 Module:eureka-server

新建 Module:

image.png

设置 Group 和 Artifact,其他默认:

image.png

选择 eureka server 依赖:

image.png

设置项目名 eureka-server,存放路径放在 seata-at 目录下:

image.png

2.2 application.yml 配置

spring:
  application:
    name: eureka-server

server:
  port: 8761

eureka:
  server:
    enable-self-preservation: false
  instance:
    hostname: eureka1
  client:
    register-with-eureka: false
    fetch-registry: false

2.3 主程序添加 @EnableEurekaServer 注解

package cn.tedu.eurekaserver;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }

}

3. 父项目

为了对 order、storage和account微服务项目依赖进行统一管理,这里创建一个 pom 类型的 maven 项目,作为父项目。

3.1 新建 Maven 项目:order-parent

新建 Module,选择 Maven 项目:

image.png

填写设置,将 order-parent 项目存放在 seata-at 项目目录下:

image.png

3.2 修改 pom.xml

看到 seata 依赖部分被注释掉了,后面添加 seata 事务时再启用。

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.tedu</groupId>
    <artifactId>order-parent</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>order-parent</name>


    <properties>
        <mybatis-plus.version>3.3.2</mybatis-plus.version>
        <druid-spring-boot-starter.version>1.1.23</druid-spring-boot-starter.version>
        <seata.version>1.3.0</seata.version>
        <spring-cloud-alibaba-seata.version>2.0.0.RELEASE</spring-cloud-alibaba-seata.version>
        <spring-cloud.version>Hoxton.SR6</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatis-plus.version}</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>${druid-spring-boot-starter.version}</version>
        </dependency>
        <!--<dependency>-->
        <!--  <groupId>com.alibaba.cloud</groupId>-->
        <!--  <artifactId>spring-cloud-alibaba-seata</artifactId>-->
        <!--  <version>${spring-cloud-alibaba-seata.version}</version>-->
        <!--  <exclusions>-->
        <!--    <exclusion>-->
        <!--      <artifactId>seata-all</artifactId>-->
        <!--      <groupId>io.seata</groupId>-->
        <!--    </exclusion>-->
        <!--  </exclusions>-->
        <!--</dependency>-->
        <!--<dependency>-->
        <!--  <groupId>io.seata</groupId>-->
        <!--  <artifactId>seata-all</artifactId>-->
        <!--  <version>${seata.version}</version>-->
        <!--</dependency>-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

4. account账户项目

在这个微服务项目中实现扣减账户金额的功能。

新建 Module:account
新建Module:

设置 Group 和 Artifact,其它选项默认:

不选择任何依赖,直接点下一步,这个项目要继承 order-parent 项目:

设置 Module 名称和存储目录:

修改 pom.xml
修改 pom.xml,设置继承父项目 order-parent:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
    <artifactId>order-parent</artifactId>
    <groupId>cn.tedu</groupId>
    <version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<groupId>cn.tedu</groupId>
<artifactId>account</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>account</name>
<description>Demo project for Spring Boot</description>

</project>
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application.yml 配置
spring:
application:

name: account

datasource:

driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost/seata_account?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
username: root
password: root

server:
port: 8081

eureka:
client:

service-url:
  defaultZone: http://localhost:8761/eureka

instance:

prefer-ip-address: true

mybatis-plus:
type-aliases-package: cn.tedu.account.entity
mapper-locations:

- classpath:mapper/*Mapper.xml

configuration:

map-underscore-to-camel-case: true

logging:
level:

cn.tedu.account.mapper: DEBUG

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Mapper配置
先在 resources 目录下新建文件夹 mapper,然后创建文件 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="cn.tedu.account.mapper.AccountMapper" >

<resultMap id="BaseResultMap" type="cn.tedu.account.entity.Account" >
    <id column="id" property="id" jdbcType="BIGINT" />
    <result column="user_id" property="userId" jdbcType="BIGINT" />
    <result column="total" property="total" jdbcType="DECIMAL" />
    <result column="used" property="used" jdbcType="DECIMAL" />
    <result column="residue" property="residue" jdbcType="DECIMAL"/>
    <result column="frozen" property="frozen" jdbcType="DECIMAL"/>
</resultMap>
<update id="decrease">
UPDATE account SET residue = residue - #{money},used = used + #{money} where user_id = #{userId};

</update>
</mapper>
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主程序添加 Mybatis 扫描注解
添加注解 @MapperScan("cn.tedu.account.mapper") :

package cn.tedu.account;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@MapperScan("cn.tedu.account.mapper")
@SpringBootApplication
public class AccountApplication {

public static void main(String[] args) {
    SpringApplication.run(AccountApplication.class, args);
}

}
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创建 Account 实体类
package cn.tedu.account.entity;

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

import java.math.BigDecimal;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Account {

private Long id;
private Long userId;
private BigDecimal total;
private BigDecimal used;
private BigDecimal residue;
private BigDecimal frozen;

}
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创建 AccountMapper 类
这里继承 Mybatis-Plus 提供的通用 Mapper 父类

package cn.tedu.account.mapper;

import cn.tedu.account.entity.Account;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import java.math.BigDecimal;

public interface AccountMapper extends BaseMapper<Account> {

void decrease(Long userId, BigDecimal money);

}
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添加 AccountService 接口和它的实现类
decrease() 方法实现扣减账户金额的功能

package cn.tedu.account.service;

import java.math.BigDecimal;

public interface AccountService {

void decrease(Long userId, BigDecimal money);

}
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package cn.tedu.account.service;

import cn.tedu.account.mapper.AccountMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
@Service
public class AccountServiceImpl implements AccountService {

@Autowired
private AccountMapper accountMapper;

@Override
public void decrease(Long userId, BigDecimal money) {
    accountMapper.decrease(userId,money);
}

}
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添加 AccountController 类提供客户端访问接口
package cn.tedu.account.controller;

import cn.tedu.account.service.AccountService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.math.BigDecimal;

@RestController
@Slf4j
public class AccountController {

@Autowired
private AccountService accountService;

@GetMapping("/decrease")
public String decrease(Long userId, BigDecimal money) {
    accountService.decrease(userId,money);
    return "用户账户扣减金额成功";
}

}
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启动 account 项目进行测试
查看 eureka 注册信息
访问 http://localhost:8761/ 查看账户服务在 eureka 中的注册信息:

访问账户服务执行账户扣减金额
访问 http://localhost:8081/decrease?userId=1&money=100

查看控制台 Mybatis 执行的 sql 日志

查看数据库表,确认金额已经被减掉

storage库存项目
storage 库存微服务项目,用来实现减少库存的功能。

新建 Module:storage
新建Module:

设置 Group 和 Artifact,其它选项默认:

不选择任何依赖,直接点下一步,这个项目要继承 order-parent 项目:

设置 Module 名称和存储目录:

修改 pom.xml
修改 pom.xml,设置继承父项目 order-parent:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
    <artifactId>order-parent</artifactId>
    <groupId>cn.tedu</groupId>
    <version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<groupId>cn.tedu</groupId>
<artifactId>storage</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>storage</name>
<description>Demo project for Spring Boot</description>

</project>
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application.yml 配置
spring:
application:

name: storage

datasource:

driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost/seata_storage?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
username: root
password: root

server:
port: 8082

eureka:
client:

service-url:
  defaultZone: http://localhost:8761/eureka

instance:

prefer-ip-address: true

mybatis-plus:
type-aliases-package: cn.tedu.storage.entity
mapper-locations:

- classpath:/mapper/*Mapper.xml

configuration:

map-underscore-to-camel-case: true

logging:
level:

cn.tedu.storage.mapper: DEBUG

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Mapper配置
先在 resources 目录下新建文件夹 mapper,然后创建文件 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="cn.tedu.storage.mapper.StorageMapper" >

<resultMap id="BaseResultMap" type="cn.tedu.storage.entity.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 storage SET used = used + #{count},residue = residue - #{count} WHERE product_id = #{productId}
</update>

</mapper>
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主程序添加 Mybatis 扫描注解
添加注解 @MapperScan("cn.tedu.storage.mapper") :

package cn.tedu.storage;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@MapperScan("cn.tedu.storage.mapper")
@SpringBootApplication
public class StorageApplication {

public static void main(String[] args) {
    SpringApplication.run(StorageApplication.class, args);
}

}
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创建 storage 实体类
package cn.tedu.storage.entity;

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

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Storage {

private Long id;
private Long productId;
private Integer total;
private Integer used;
private Integer residue;
private Integer frozen;

}
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创建 StorageMapper 类
这里继承 Mybatis-Plus 提供的通用 Mapper 父类

package cn.tedu.storage.mapper;

import cn.tedu.storage.entity.Storage;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;

public interface StorageMapper extends BaseMapper<Storage> {

void decrease(Long productId, Integer count);

}
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添加 StorageService 接口和它的实现类
decrease() 方法实现减少商品库存功能。

package cn.tedu.storage.service;

public interface StorageService {

void decrease(Long productId, Integer count) throws Exception;

}
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package cn.tedu.storage.service;

import cn.tedu.storage.mapper.StorageMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class StorageServiceImpl implements StorageService {

@Autowired
private StorageMapper storageMapper;

@Override
public void decrease(Long productId, Integer count) throws Exception {
    storageMapper.decrease(productId,count);
}

}
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添加 StorageController 类提供客户端访问接口
package cn.tedu.storage.controller;

import cn.tedu.storage.service.StorageService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class StorageController {

@Autowired
private StorageService storageService;

@GetMapping("/decrease")
public String decrease(Long productId, Integer count) throws Exception {
    storageService.decrease(productId,count);
    return "减少商品库存成功";
}

}
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启动 storage 项目进行测试
查看 eureka 注册信息
访问 http://localhost:8761/ 查看库存服务在 eureka 中的注册信息:

访问库存服务,执行减少库存操作
访问 http://localhost:8082/decrease?productId=1&count=1

查看控制台 Mybatis 执行的 sql 日志

查看数据库表,确认金额已经被减掉

order订单项目
order 订单项目保存订单,并调用 storage 和 account 减少库存和扣减金额。

新建 Module:order
新建Module:

设置 Group 和 Artifact,其它选项默认:

不选择任何依赖,直接点下一步,这个项目要继承 order-parent 项目:

设置 Module 名称和存储目录:

修改 pom.xml
修改 pom.xml,设置继承父项目 order-parent:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
    <artifactId>order-parent</artifactId>
    <groupId>cn.tedu</groupId>
    <version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<groupId>cn.tedu</groupId>
<artifactId>order</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>order</name>
<description>Demo project for Spring Boot</description>

</project>
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application.yml 配置
spring:
application:

name: order

datasource:

driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost/seata_order?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
username: root
password: root

server:
port: 8083

eureka:
client:

service-url:
  defaultZone: http://localhost:8761/eureka

instance:

prefer-ip-address: true

mybatis-plus:
type-aliases-package: cn.tedu.sdorder.entity
mapper-locations:

- classpath:/mapper/*Mapper.xml

configuration:

map-underscore-to-camel-case: true

logging:
level:

cn.tedu.order.mapper: DEBUG

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Mapper配置
先在 resources 目录下新建文件夹 mapper,然后创建文件 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="cn.tedu.order.mapper.OrderMapper" >

<resultMap id="BaseResultMap" type="cn.tedu.order.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="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 `order` (`id`,`user_id`,`product_id`,`count`,`money`,`status`)
    VALUES(#{id}, #{userId}, #{productId}, #{count}, #{money},1);
</insert>

</mapper>
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主程序添加 Mybatis 扫描注解
添加注解 @MapperScan("cn.tedu.order.mapper") :

package cn.tedu.order;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@MapperScan("cn.tedu.order.mapper")
@SpringBootApplication
public class OrderApplication {

public static void main(String[] args) {
    SpringApplication.run(OrderApplication.class, args);
}

}
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创建 order 实体类
package cn.tedu.order.entity;

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

import java.math.BigDecimal;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Order {

private Long id;
private Long userId;
private Long productId;
private Integer count;
private BigDecimal money;
private Integer status;

}
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创建 OrderMapper 类
这里继承 Mybatis-Plus 提供的通用 Mapper 父类

package cn.tedu.order.mapper;

import cn.tedu.order.entity.Order;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;

public interface OrderMapper extends BaseMapper {

void create(Order order);

}
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添加 OrderService 接口和它的实现类
create() 方法实现保存订单的功能。

package cn.tedu.order.service;

import cn.tedu.order.entity.Order;

public interface OrderService {

void create(Order order);

}
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这里添加了三个 // TODO 注释,会在后面两节中实现。

package cn.tedu.order.service;

import cn.tedu.order.entity.Order;
import cn.tedu.order.mapper.OrderMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Random;

@Service
public class OrderServiceImpl implements OrderService {

@Autowired
private OrderMapper orderMapper;

@Override
public void create(Order order) {
    // TODO: 从全局唯一id发号器获得id,这里暂时随机产生一个 orderId
    Long orderId = Long.valueOf(new Random().nextInt(Integer.MAX_VALUE));
    order.setId(orderId);

    orderMapper.create(order);

    // TODO: 调用storage,修改库存

    // TODO: 调用account,修改账户余额

}

}
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添加 OrderController 类提供客户端访问接口
package cn.tedu.order.controller;

import cn.tedu.order.entity.Order;
import cn.tedu.order.service.OrderService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@Slf4j
public class OrderController {

@Autowired
OrderService orderService;

/*
用户用这个路径进行访问:
http://localhost:8083/create?userId=1&productId=1&count=10&money=100
 */
@GetMapping("/create")
public String create(Order order) {
    log.info("创建订单");
    orderService.create(order);
    return "创建订单成功";
}

}
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启动 order 项目进行测试
查看 eureka 注册信息
访问 http://localhost:8761/ 查看订单服务在 eureka 中的注册信:

访问订单服务,执行订单保存
访问 http://localhost:8083/create?userId=1&productId=1&count=10&money=100

查看控制台 Mybatis 执行的 sql 日志

查看数据库表,确认订单保存成功

全局唯一id发号器
分布式系统中,产生唯一流水号的服务系统俗称发号器。

有很多发号器开源项目,这里使用 EasyIdGenerator,具体项目信息请访问:https://github.com/lookingats...

项目使用非常简单,将项目下载下来稍作配置即可。

下载项目
访问 https://github.com/lookingats... ,下载发号器项目。

解压到 seata-at 工程目录下
解压,和前面的项目放到同一个工程目录。

把目录改名为 easy-id-generator :

导入 Module
在Maven工具窗口中点击添加按钮,选择发号器项目的 pom.xml 文件导入该项目:

注意: 如果右侧没有Maven工具标签,请按两下shift键,然后查找 “add maven projects” 就可以找到这个工具。

配置

pom.xml
发号器向 eureka 进行注册,以便其它服务发现它。

在pom.xml 中添加 Spring Cloud Eureka Client 依赖:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xmlns="http://maven.apache.org/POM/4.0.0"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.2.RELEASE</version>
    <relativePath/>
</parent>

<groupId>com.easy.id</groupId>
<artifactId>easy-id-generator</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.source>1.8</maven.compiler.source>
    <junit.version>4.12</junit.version>
    <mysql.connector.version>8.0.16</mysql.connector.version>
    <com.alibaba.fastjson.version>1.2.62</com.alibaba.fastjson.version>
    <lombok.version>1.18.8</lombok.version>
    <curator.version>2.6.0</curator.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>${lombok.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.connector.version}</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>${com.alibaba.fastjson.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.curator</groupId>
        <artifactId>curator-recipes</artifactId>
        <version>${curator.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
</dependencies>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Greenwich.SR6</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

</project>
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application.yml
配置使用数据库来生成自增id
向eureka进行注册
server:
port: 9090

easy-id-generator:
snowflake:

enable: false
zk:
  connection-string: 127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183
load-worker-id-from-file-when-zk-down: true  # 当zk不可访问时,从本地文件中读取之前备份的workerId

segment:

enable: true
db-list: seata_order
fetch-segment-retry-times: 3 # 从数据库获取号段失败重试次数

spring:
application:

name: easy-id-generator

eureka:
client:

service-url:
  defaultZone: http://localhost:8761/eureka

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seata_order.properties 数据库配置
在 resources 目录下新建配置文件 seata_order.properties,配置 seata_order 数据库的连接信息。

jdbcUrl=jdbc:mysql://localhost:3306/seata_order?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8
driverClassName=com.mysql.cj.jdbc.Driver
dataSource.user=root
dataSource.password=root
dataSource.cachePrepStmts=true
dataSource.prepStmtCacheSize=250
dataSource.prepStmtCacheSqlLimit=2048
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数据表
在 db-init 项目的 order.sql 中已经创建了数据表,并插入了一个名为 order_business 的自增id条目。

项目的 schema.sql 中为示例数据表。

启动项目并访问测试
查看 eureka 中的注册信息

访问测试
根据 SegmentEasyIdController 类的设置,访问下面地址获取自增id:
http://localhost:9090/segment/ids/next_id?businessType=order_business

order订单添加Feign,调用库存和账户服务
调用发号器获得全局唯一id
调用库存服务减少商品库存
调用账户服务扣减用户金额

application.yml
ribbon 默认超时时间是1秒,为了方便分布式事务测试,把超时时长改为 10 秒:

spring:
application:

name: order

datasource:

driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost/seata_order?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
username: root
password: root

server:
port: 8083

eureka:
client:

service-url:
  defaultZone: http://localhost:8761/eureka

instance:

prefer-ip-address: true

mybatis-plus:
type-aliases-package: cn.tedu.sdorder.entity
mapper-locations:

- classpath:/mapper/*Mapper.xml

configuration:

map-underscore-to-camel-case: true

logging:
level:

cn.tedu.order.mapper: DEBUG

ribbon:
ReadTimeout: 10000
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主程序添加注解启用 Feign
添加 @EnableFeignClients 注解:

package cn.tedu.order;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableFeignClients
@MapperScan("cn.tedu.order.mapper")
@SpringBootApplication
public class OrderApplication {

public static void main(String[] args) {
    SpringApplication.run(OrderApplication.class, args);
}

}
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添加Feign声明式客户端接口
发号器的客户端接口:

package cn.tedu.order.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(name = "EASY-ID-GENERATOR")
public interface EasyIdGeneratorClient {

@GetMapping("/segment/ids/next_id")
Long nextId(@RequestParam String businessType);

}
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库存服务的客户端接口:

package cn.tedu.order.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(name = "storage")
public interface StorageClient {

@GetMapping("/decrease")
String decrease(@RequestParam Long productId, @RequestParam Integer count);

}
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账户服务的客户端接口:

package cn.tedu.order.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.math.BigDecimal;

@FeignClient(name = "account")
public interface AccountClient {

@GetMapping("/decrease")
String decrease(@RequestParam Long userId, @RequestParam BigDecimal money);

}
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在业务代码中通过Feign客户端调用远程服务
package cn.tedu.order.service;

import cn.tedu.order.entity.Order;
import cn.tedu.order.feign.AccountClient;
import cn.tedu.order.feign.EasyIdGeneratorClient;
import cn.tedu.order.feign.StorageClient;
import cn.tedu.order.mapper.OrderMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Random;

@Service
public class OrderServiceImpl implements OrderService {

@Autowired
private OrderMapper orderMapper;
@Autowired
EasyIdGeneratorClient easyIdGeneratorClient;
@Autowired
private AccountClient accountClient;
@Autowired
private StorageClient storageClient;

@Override
public void create(Order order) {
    // 从全局唯一id发号器获得id
    Long orderId = easyIdGeneratorClient.nextId("order_business");
    order.setId(orderId);

    orderMapper.create(order);

    // 修改库存
    storageClient.decrease(order.getProductId(), order.getCount());

    // 修改账户余额
    accountClient.decrease(order.getUserId(), order.getMoney());
}

}
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启动项目,访问测试
访问订单项目进行测试:

http://localhost:8083/create?userId=1&productId=1&count=10&money=100

查看 order、storage和account的控制台查看日志
查看三个数据库中的数据变化

将项目托管到 git 仓库

seata-samples 设置成本地 git 仓库
目前项目的目录结构:

seata-samples
        |- seata-at
             |- ...

seata-at 工程对 AT 事务进行测试。后面我们还要测试 TCC 事务,会创建 seata-tcc 工程:

seata-samples
        |- seata-at
             |- ...
        |- seata-tcc
             |- ...

我们可以把 seata 测试的这两个项目一起托管到同一个 git 仓库,便于管理,所以直接把 seata-samples 目录设置为本地仓库。

选择创建本地仓库:

选择 seata-samples 文件夹创建为本地库:

按 ctrl + k 提交,选择提交全部文件,填写提交说明后进行提交:

推送到远程 git 仓库
接下来先在 github 或 gitee 创建一个远程仓库,例如可以命名为 seata-samples。

再按 ctrl+shift+k 先设置远程仓库路径:

点击 push 向远程仓库推送:

项目源码: https://gitee.com/benwang6/se...

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