关于分布式事务:分布式事务四Seata-AT模式Spring-Cloud微服务案例

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我的项目源码：https://gitee.com/benwang6/se…

一、订单业务案例

1.1 创立 Empty Project：seata-at

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

接着创立 seata-at 我的项目：

抉择 Empty Project：

填写我的项目名 seata-at 和寄存目录，寄存在你新建的 seata-samples 目录下：

1.2 数据库初始化工具

订单案例波及四个数据库：

为了后续测试不便咱们编写一个工具，用来重置所有数据库表，能够不便地把数据重置到初始状态。

1.3 新建 Module：db-init

新建 Module，抉择 Spring Initializr

填写 Group 和 Artifact，其余选项默认即可：

增加 JDBC 和 MySQL Driver 依赖：

实现后，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

我的项目的 application.properties 文件改名成 application.yml，而后增加 mysql 连贯配置：

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

留神：在连贯地址中没有指定库名，是因为咱们要先后连贯四个数据库，前面执行的 sql 脚本文件中会执行 use 来进行数据库切换。

1.5 增加 sql 脚本文件

案例中的 sql 脚本来自不同的我的项目：

seata 库
seata 库是 Seata Server（TC，全局事务协调器）应用的数据库，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
这个案例我的项目是 Seata 官网案例，我少做了一些改变。案例用的建表语句来自这里：https://github.com/seata/seat…，在各项目标 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惟一 id 发号器，他反对数据库自增 id 形式和雪花算法，因为雪花算法须要用到 zookeeper 服务器，为了简便起见，咱们应用数据库自增 id 的形式。segment 表就来自这个开源我的项目，我的项目地址：https://github.com/lookingats…

上面，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：

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：创立中；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，惟一 ',
    max_id        BIGINT      DEFAULT 0  NOT NULL COMMENT '以后最大 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 '创立工夫',
    updated_at    BIGINT UNSIGNED        NOT NULL COMMENT '更新工夫',
    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 '残余库存',
  `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 '残余可用额度',
  `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 主程序中增加代码，执行 sql 脚本

Spring 中提供了一个 jdbc 脚本执行器，应用这个工具能够十分不便的运行一个 sql 脚本文件，上面是这个办法：

ScriptUtils.executeSqlScript()

只须要传入它须要的参数即可。

上面代码运行 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从新创立，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 注册核心

2.1 新建 Module：eureka-server

新建 Module：

设置 Group 和 Artifact，其余默认：

抉择 eureka server 依赖：

设置我的项目名 eureka-server，寄存门路放在 seata-at 目录下：

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 主程序增加 @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. 父我的项目

为了对 order、storage 和 account 微服务项目依赖进行对立治理，这里创立一个 pom 类型的 maven 我的项目，作为父我的项目。

3.1 新建 Maven 我的项目：order-parent

新建 Module，抉择 Maven 我的项目：

填写设置，将 order-parent 我的项目寄存在 seata-at 我的项目目录下：

3.2 批改 pom.xml

看到 seata 依赖局部被正文掉了，前面增加 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 账户我的项目

在这个微服务项目中实现扣减账户金额的性能。

新建 Module：account
新建 Module：

设置 Group 和 Artifact，其它选项默认：

不抉择任何依赖，间接点下一步，这个我的项目要继承 order-parent 我的项目：

设置 Module 名称和存储目录：

批改 pom.xml
批改 pom.xml，设置继承父我的项目 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，而后创立文件 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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主程序增加 Mybatis 扫描注解
增加注解 @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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创立 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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创立 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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增加 AccountService 接口和它的实现类
decrease() 办法实现扣减账户金额的性能

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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增加 AccountController 类提供客户端拜访接口
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 "用户账户扣减金额胜利";
}

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

拜访账户服务执行账户扣减金额
拜访 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，确认金额曾经被减掉

storage 库存我的项目
storage 库存微服务项目，用来实现缩小库存的性能。

新建 Module：storage
新建 Module：

设置 Group 和 Artifact，其它选项默认：

不抉择任何依赖，间接点下一步，这个我的项目要继承 order-parent 我的项目：

设置 Module 名称和存储目录：

批改 pom.xml
批改 pom.xml，设置继承父我的项目 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，而后创立文件 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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主程序增加 Mybatis 扫描注解
增加注解 @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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创立 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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创立 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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增加 StorageService 接口和它的实现类
decrease() 办法实现缩小商品库存性能。

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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增加 StorageController 类提供客户端拜访接口
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 "缩小商品库存胜利";
}

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

拜访库存服务，执行缩小库存操作
拜访 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，确认金额曾经被减掉

order 订单我的项目
order 订单我的项目保留订单，并调用 storage 和 account 缩小库存和扣减金额。

新建 Module：order
新建 Module：

设置 Group 和 Artifact，其它选项默认：

不抉择任何依赖，间接点下一步，这个我的项目要继承 order-parent 我的项目：

设置 Module 名称和存储目录：

批改 pom.xml
批改 pom.xml，设置继承父我的项目 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，而后创立文件 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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主程序增加 Mybatis 扫描注解
增加注解 @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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创立 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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创立 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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增加 OrderService 接口和它的实现类
create() 办法实现保留订单的性能。

package cn.tedu.order.service;

import cn.tedu.order.entity.Order;

public interface OrderService {

void create(Order order);

}
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这里增加了三个 // TODO 正文，会在前面两节中实现。

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: 从全局惟一 id 发号器取得 id，这里临时随机产生一个 orderId
    Long orderId = Long.valueOf(new Random().nextInt(Integer.MAX_VALUE));
    order.setId(orderId);

    orderMapper.create(order);

    // TODO: 调用 storage，批改库存

    // TODO: 调用 account，批改账户余额

}

}
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增加 OrderController 类提供客户端拜访接口
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;

/*
用户用这个门路进行拜访：http://localhost:8083/create?userId=1&productId=1&count=10&money=100
 */
@GetMapping("/create")
public String create(Order order) {log.info("创立订单");
    orderService.create(order);
    return "创立订单胜利";
}

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

拜访订单服务，执行订单保留
拜访 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，确认订单保留胜利

全局惟一 id 发号器
分布式系统中，产生惟一流水号的服务零碎俗称发号器。

有很多发号器开源我的项目，这里应用 EasyIdGenerator，具体我的项目信息请拜访：https://github.com/lookingats…

我的项目应用非常简单，将我的项目下载下来稍作配置即可。

下载我的项目
拜访 https://github.com/lookingats…，下载发号器我的项目。

解压到 seata-at 工程目录下
解压，和后面的我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 工具窗口中点击增加按钮，抉择发号器我的项目的 pom.xml 文件导入该我的项目：

留神：如果右侧没有 Maven 工具标签，请按两下 shift 键，而后查找“add maven projects”就能够找到这个工具。

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 中增加 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
配置应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 不可拜访时，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 数据库的连贯信息。

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 我的项目的 order.sql 中曾经创立了数据表，并插入了一个名为 order_business 的自增 id 条目。

我的项目的 schema.sql 中为示例数据表。

启动我的项目并拜访测试
查看 eureka 中的注册信息

拜访测试
依据 SegmentEasyIdController 类的设置，拜访上面地址获取自增 id：
http://localhost:9090/segment/ids/next_id?businessType=order_business

order 订单增加 Feign，调用库存和账户服务
调用发号器取得全局惟一 id
调用库存服务缩小商品库存
调用账户服务扣减用户金额

application.yml
ribbon 默认超时工夫是 1 秒，为了不便分布式事务测试，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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主程序增加注解启用 Feign
增加 @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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增加 Feign 申明式客户端接口
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 客户端调用近程服务
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) {
    // 从全局惟一 id 发号器取得 id
    Long orderId = easyIdGeneratorClient.nextId("order_business");
    order.setId(orderId);

    orderMapper.create(order);

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

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

}
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启动我的项目，拜访测试
拜访订单我的项目进行测试：

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动

将我的项目托管到 git 仓库

seata-samples 设置老本地 git 仓库
目前我的项目的目录构造：

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

seata-at 工程对 AT 事务进行测试。前面咱们还要测试 TCC 事务，会创立 seata-tcc 工程：

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

咱们能够把 seata 测试的这两个我的项目一起托管到同一个 git 仓库，便于管理，所以间接把 seata-samples 目录设置为本地仓库。

抉择创立本地仓库：

抉择 seata-samples 文件夹创立为本地库：

按 ctrl + k 提交，抉择提交全副文件，填写提交阐明后进行提交：

推送到近程 git 仓库
接下来先在 github 或 gitee 创立一个近程仓库，例如能够命名为 seata-samples。

再按 ctrl+shift+k 先设置近程仓库门路：

点击 push 向近程仓库推送：

我的项目源码：https://gitee.com/benwang6/se…

正文完
分布式事务
发表至： 分布式事务
2021-03-05
 0
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