SpringCloud Alibaba之Seata分布式事务学习笔记(上)
@[toc]
前言
所有博客文件目录索引:博客目录索引(持续更新)
学习视频:SpringCloud 教程 已完结(IDEA 2022.1最新版)4K蓝光画质 微服务开发
PS:本章节中部分图片是直接引用学习课程课件,如有侵权,请联系删除。
当前项目环境版本:springboot 2.3.12.RELEASE
、springcloud alibaba 2.2.7.RELEASE
、SpringCloud Hoxton-SR12
。
一、Seata介绍
1.1、认识Seata
SpringCloud Alibaba为我们提供了用于处理分布式事务的组件Seata。
Seata 是一款开源的分布式事务解决方案,致力于提供高性能和简单易用的分布式事务服务。Seata 将为用户提供了 AT、TCC、SAGA 和 XA 事务模式,为用户打造一站式的分布式解决方案。
实际上,就是多了一个中间人来协调所有服务的事务。
1.2、Seata的四种事务模式
Seata支持4种事务模式,官网文档:https://seata.io/zh-cn/docs/overview/what-is-seata.html
- AT:本质上就是2PC的升级版,在 AT 模式下,用户只需关心自己的 “业务SQL”
-
- 一阶段,Seata 会拦截“业务 SQL”,首先解析 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”,然后执行“业务 SQL”更新业务数据,在业务数据更新之后,再将其保存成“after image”,最后生成行锁。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。
- 二阶段如果确认提交的话,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,当然如果需要回滚,那么就用“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,如果不一致就说明有脏写,出现脏写就需要转人工处理。
-
TCC:和我们上面讲解的思路是一样的。
-
XA:同上,但是要求数据库本身支持这种模式才可以。
-
Saga:用于处理长事务,每个执行者需要实现事务的正向操作和补偿操作:
二、实战:集成Seata实现分布式事务(AT模式)
说明:demo项目其中的部分代码写的比较简陋,我们将重心放在分布式事务上即可!
对于2.1部分的代码我已经进行了打包:在对应gitee或github仓库的指定位置下载即可,可直接复现分布式事务问题!
2.1、本地项目搭建(复现分布式事务问题)
项目介绍
为了能够集成Seata组件来实现分布式事务数据一致性的效果,来构建多个微服务进行远程调用。
本次使用到的分布式组件包含:nacos(注册中心)、feign(远程调用组件)
服务包含:book-service(图书服务)、borrow-service(借阅服务)、user-service(用户服务)。
事务问题描述(目标复现):在borrow-service服务中会在一个service中会执行本地事务,远程调用book-service以及user-service的接口,这两个服务的接口都与数据库有交互操作,在没有使用Seata组件前,若是其中某个服务出现异常,那么之前提交的操作都不能够进行回滚,因为这涉及到多个不同的事务管理器。
看一下数据库表:
db_book
:图书表,其中count表示该数的库存数量。对应的是book-service。
db_borrow
:借阅表。对应的是borrow-service。
db_user
:用户表。对应的是user-service。
Nacos服务创建命名空间
创建命名空间为seata-demo:
book-service服务
引入依赖:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.0</version>
</dependency>
</dependencies>
1、yaml配置项:application.yaml
server:
port: 8083
spring:
application:
name: book-service
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/seata-demo?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
username: root
password: 123456
cloud:
nacos: # 如果不指定命名空间会默认注册到public里面去 如果没有指定分组 会注册到DEFAULT_GROUP
server-addr: localhost:8848 # 指定服务注册地址
username: nacos
password: nacos
discovery:
namespace: 0245d1ab-5611-486e-8444-957bebab6d78 # 若是不指定,默认就是public
group: BOOK_GROUP # 若是不指定,默认是DEFAULT_GROUP
service: book-service # 默认使用的是spring.application.name,这里可以进行指定
#控制台打印sql(默认不会有打印sql语句)
mybatis-plus:
mapper-locations: classpath*:/mapperxxx/**/*.xml
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
2、Mapper接口以及Mapper配置文件、pojo对象
package com.changlu.seatauserservice.pojo;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import lombok.EqualsAndHashCode;
import java.io.Serializable;
@Data
@EqualsAndHashCode(callSuper = false)
@TableName("db_user")
public class UserModel implements Serializable {
private static final long serialVersionUID = 1L;
@TableId("uid")
private Integer uid;
@TableField("name")
private String name;
@TableField("age")
private Integer age;
@TableField("book_count")
private Integer bookCount;
}
<?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.changlu.seatabookservcie.mapper.BookMapper">
<!-- 通用查询映射结果 -->
<resultMap id="BaseResultMap" type="com.changlu.seatabookservcie.pojo.BookModel">
<id column="id" property="id" />
<result column="name" property="name" />
<result column="count" property="count" />
</resultMap>
</mapper>
package com.changlu.seatabookservcie.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.changlu.seatabookservcie.pojo.BookModel;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
/**
* <p>
* Mapper 接口
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
public interface BookMapper extends BaseMapper<BookModel> {
@Select("SELECT count from db_book WHERE id = #{id}")
int bookRemain(Integer id);
@Update("UPDATE db_book set count = count - 1 where id = #{id} and count > 0")
int minusBookRemain(Integer id);
}
3、Service接口以及实现类:com.changlu.seatabookservcie.service.BookService
package com.changlu.seatabookservcie.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.changlu.seatabookservcie.pojo.BookModel;
/**
* <p>
* 服务类
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
public interface BookService extends IService<BookModel> {
int bookRemain(Integer id);
int minusBookRemain(Integer id);
}
package com.changlu.seatabookservcie.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.changlu.seatabookservcie.mapper.BookMapper;
import com.changlu.seatabookservcie.pojo.BookModel;
import com.changlu.seatabookservcie.service.BookService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
/**
* <p>
* 服务实现类
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
@Service
public class BookServiceImpl extends ServiceImpl<BookMapper, BookModel> implements BookService {
@Resource
private BookMapper bookMapper;
@Override
public int bookRemain(Integer id) {
return bookMapper.bookRemain(id);
}
@Override
public int minusBookRemain(Integer id) {
return bookMapper.minusBookRemain(id);
}
}
4、控制器,对外暴露两个接口,一个是查询以及一个更改数据:
package com.changlu.seatabookservcie.controller;
import com.changlu.seatabookservcie.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* <p>
* 前端控制器
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
@RestController
@RequestMapping("/book")
public class BookController {
@Autowired
private BookService bookService;
@GetMapping("/remain/{id}")
public int bookRemain(@PathVariable("id") Integer id) {
return bookService.bookRemain(id);
}
@GetMapping("/minus/{id}")
public int minusBookRemain(@PathVariable("id") Integer id) {
return bookService.minusBookRemain(id);
}
}
5、启动器开启服务注册以及Mapper扫描:启动器上添加
@MapperScan("com.changlu.seatabookservcie.mapper")
@EnableDiscoveryClient
user-service服务
引入的依赖与book-service一致,不再贴出。
1、配置文件:application.yaml
server:
port: 8081
spring:
application:
name: user-service
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/seata-demo?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
username: root
password: 123456
cloud:
nacos: # 如果不指定命名空间会默认注册到public里面去 如果没有指定分组 会注册到DEFAULT_GROUP
server-addr: localhost:8848 # 指定服务注册地址
username: nacos
password: nacos
discovery:
namespace: 0245d1ab-5611-486e-8444-957bebab6d78 # 若是不指定,默认就是public
group: BOOK_GROUP # 若是不指定,默认是DEFAULT_GROUP
service: user-service # 默认使用的是spring.application.name,这里可以进行指定
#控制台打印sql(默认不会有打印sql语句)
mybatis-plus:
mapper-locations: classpath*:/mapperxxx/**/*.xml
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
2、mapper接口以及mapper映射配置文件、pojo类
package com.changlu.seataborrowservice.pojo;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import lombok.EqualsAndHashCode;
import java.io.Serializable;
/**
* <p>
*
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
@Data
@EqualsAndHashCode(callSuper = false)
@TableName("db_borrow")
public class BorrowModel implements Serializable {
private static final long serialVersionUID = 1L;
@TableId("user_id")
private Integer userId;
@TableField("book_id")
private Integer bookId;
}
package com.changlu.seatauserservice.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.changlu.seatauserservice.pojo.UserModel;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
/**
* <p>
* Mapper 接口
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
public interface UserMapper extends BaseMapper<UserModel> {
@Select("SELECT book_count from db_user WHERE uid = #{uid}")
int getUserRemainBook(Integer uid);
@Update("UPDATE db_user set book_count = book_count - 1 where uid = #{uid} and book_count > 0")
int minusUserBookCount(Integer uid);
}
<?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.changlu.seatauserservice.mapper.UserMapper">
<!-- 通用查询映射结果 -->
<resultMap id="BaseResultMap" type="com.changlu.seatauserservice.pojo.UserModel">
<id column="uid" property="uid" />
<result column="name" property="name" />
<result column="age" property="age" />
<result column="book_count" property="bookCount" />
</resultMap>
</mapper>
3、service接口:
package com.changlu.seatauserservice.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.changlu.seatauserservice.pojo.UserModel;
/**
* <p>
* 服务类
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
public interface UserService extends IService<UserModel> {
int getUserRemainBook(Integer uid);
int minusUserBookCount(Integer uid);
}
package com.changlu.seatauserservice.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.changlu.seatauserservice.mapper.UserMapper;
import com.changlu.seatauserservice.pojo.UserModel;
import com.changlu.seatauserservice.service.UserService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
/**
* <p>
* 服务实现类
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, UserModel> implements UserService {
@Resource
private UserMapper userMapper;
@Override
public int getUserRemainBook(Integer uid) {
return userMapper.getUserRemainBook(uid);
}
@Override
public int minusUserBookCount(Integer uid) {
return userMapper.minusUserBookCount(uid);
}
}
4、控制器:
package com.changlu.seatauserservice.controller;
import com.changlu.seatauserservice.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
/**
* <p>
* 前端控制器
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/remainbook/{uid}")
public int getUserRemainBook(@PathVariable("uid")Integer uid) {
return userService.getUserRemainBook(uid);
}
@GetMapping("/minusbook/{uid}")
public int minusUserBookCount(@PathVariable("uid")Integer uid) {
return userService.minusUserBookCount(uid);
}
}
5、启动器上添加注解,与book-service一致
@MapperScan("com.changlu.seatauserservice.mapper")
@EnableDiscoveryClient
borrow-service服务(分布式事务问题产生见其中service方法)
在borrow-service服务中,还包含有feign组件,该服务会对book-service、user-service服务来进行远程调用,那么本次服务的分布式事务问题也是从这里产生的!
引入依赖:与前面服务一致同样也有nacos注册依赖,唯一多了一个就是feign组件
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<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>
1、配置文件:applicaion.yaml
server:
port: 8082
spring:
application:
name: borrow-service
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/seata-demo?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
username: root
password: 123456
cloud:
nacos: # 如果不指定命名空间会默认注册到public里面去 如果没有指定分组 会注册到DEFAULT_GROUP
server-addr: localhost:8848 # 指定服务注册地址
username: nacos
password: nacos
discovery:
namespace: 0245d1ab-5611-486e-8444-957bebab6d78 # 若是不指定,默认就是public
group: BOOK_GROUP # 若是不指定,默认是DEFAULT_GROUP
service: borrow-service # 默认使用的是spring.application.name,这里可以进行指定
#控制台打印sql(默认不会有打印sql语句)
mybatis-plus:
mapper-locations: classpath*:/mapperxxx/**/*.xml
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
2、mapper接口以及mapper映射文件、pojo类
package com.changlu.seataborrowservice.pojo;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import lombok.EqualsAndHashCode;
import java.io.Serializable;
/**
* @author ChangLu
* @since 2022-08-02
*/
@Data
@EqualsAndHashCode(callSuper = false)
@TableName("db_borrow")
public class BorrowModel implements Serializable {
private static final long serialVersionUID = 1L;
@TableId("user_id")
private Integer userId;
@TableField("book_id")
private Integer bookId;
}
<?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.changlu.seataborrowservice.mapper.BorrowMapper">
<!-- 通用查询映射结果 -->
<resultMap id="BaseResultMap" type="com.changlu.seataborrowservice.pojo.BorrowModel">
<id column="user_id" property="userId" />
<result column="book_id" property="bookId" />
</resultMap>
</mapper>
package com.changlu.seataborrowservice.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.changlu.seataborrowservice.pojo.BorrowModel;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
/**
* <p>
* Mapper 接口
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
public interface BorrowMapper extends BaseMapper<BorrowModel> {
@Select("select * from db_borrow where user_id = #{userId} AND book_id = #{bookId}")
BorrowModel getBorrow(@Param("userId")Integer userId, @Param("bookId")Integer bookId);
@Insert("insert into db_borrow(user_id, book_id) values(#{userId}, #{bookId})")
int addBorrow(@Param("userId")Integer userId, @Param("bookId")Integer bookId);
}
3、两个服务的feign接口:
package com.changlu.seataborrowservice.feign;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
/**
* @Description:
* @Author: changlu
* @Date: 7:52 PM
*/
@FeignClient(value = "user-service")
public interface BorrowUserFeign {
@GetMapping("/user/remainbook/{uid}")
int getUserRemainBook(@PathVariable("uid")Integer uid);
@GetMapping("/user/minusbook/{uid}")
int minusUserBookCount(@PathVariable("uid")Integer uid);
}
package com.changlu.seataborrowservice.feign;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
/**
* @Description:
* @Author: changlu
* @Date: 7:52 PM
*/
@FeignClient(value = "book-service")
public interface BorrowBookFeign {
@GetMapping("/book/minus/{id}")
int minusBookRemain(@PathVariable("id") Integer id);
@GetMapping("/book/remain/{id}")
int bookRemain(@PathVariable("id") Integer id);
}
4、出现分布式事务问题的service方法:
package com.changlu.seataborrowservice.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.changlu.seataborrowservice.pojo.BorrowModel;
/**
* @author ChangLu
* @since 2022-08-02
*/
public interface BorrowService extends IService<BorrowModel> {
Boolean borrow(Integer uid, Integer bookId);
}
package com.changlu.seataborrowservice.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.changlu.seataborrowservice.feign.BorrowBookFeign;
import com.changlu.seataborrowservice.feign.BorrowUserFeign;
import com.changlu.seataborrowservice.mapper.BorrowMapper;
import com.changlu.seataborrowservice.pojo.BorrowModel;
import com.changlu.seataborrowservice.service.BorrowService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
/**
* @author ChangLu
* @since 2022-08-02
*/
@Service
public class BorrowServiceImpl extends ServiceImpl<BorrowMapper, BorrowModel> implements BorrowService {
@Resource
private BorrowMapper borrowMapper;
@Autowired
private BorrowBookFeign borrowBookFeign;
@Autowired
private BorrowUserFeign borrowUserFeign;
@Override
public Boolean borrow(Integer uid, Integer bookId) {
//1、判断图书与用户是否都支持借阅
if (borrowBookFeign.bookRemain(bookId) < 0) {
throw new RuntimeException("该图书库存不足,无法借阅!");
}
if (borrowUserFeign.getUserRemainBook(uid) < 1){
throw new RuntimeException("该用户借阅图书数量已上限!");
}
//2、扣减图书库存数量
if (borrowBookFeign.minusBookRemain(bookId) < 1) { //book-service服务修改数据
throw new RuntimeException("扣减图书数量失败!");
}
//3、添加图书用户借阅记录
if (borrowMapper.getBorrow(uid, bookId) != null) {
throw new RuntimeException("用户已借阅该图书!");
}
if (borrowMapper.addBorrow(uid, bookId) < 1) { //本身服务新增数据
throw new RuntimeException("图书借阅失败!");
}
//4、用户自己本身借阅数量-1
if (borrowUserFeign.minusUserBookCount(uid) < 1) { //user-service服务修改数据
throw new RuntimeException("用户借阅书籍数量更新有误!");
}
return true;
}
}
5、控制器:
package com.changlu.seataborrowservice.controller;
import com.alibaba.fastjson.JSONObject;
import com.changlu.seataborrowservice.service.BorrowService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* <p>
* 前端控制器
* </p>
*
* @author ChangLu
* @since 2022-08-02
*/
@RestController
@RequestMapping("/borrow")
public class BorrowController {
@Autowired
private BorrowService borrowService;
@GetMapping("/{uid}/{bookId}")
public JSONObject borrow(@PathVariable("uid") Integer uid, @PathVariable("bookId") Integer bookId) {
JSONObject object = new JSONObject();
Boolean res = false;
try {
res = borrowService.borrow(uid, bookId);
}catch (Exception ex) {
object.put("code", 500);
object.put("msg", ex.getMessage());
return object;
}
if (res) {
object.put("code", 200);
object.put("msg", "借阅成功!");
}else {
object.put("code", 500);
object.put("msg", "借阅失败!");
}
return object;
}
}
6、启动器上添加注解来进行服务注册、mapper扫描以及feign包扫描增强
@MapperScan("com.changlu.seataborrowservice.mapper")
@EnableDiscoveryClient
@EnableFeignClients
问题复现测试
提前准备
ok,此时我们的项目环境搭建已经完成,此时就来启动nacos以及我们的三个服务,来进行接口测试吧!
我们来看下数据库当前的一些数据信息:每本书的库存是3本,借阅记录当前没有,用户借阅次数是3次
开始测试
我们来访问borrow-service接口:http://localhost:8082/borrow/1/2
可以看到借阅成功!此时看一下数据库的信息:
可以看到西游记库存扣减1,借阅记录+1,用户借阅书籍数量-1,没有问题,那么我们此时再次调用找个接口试下:
问题提前指出:再次进行请求前我们来看下在borrow-service中的借阅方法怎么写的,若是我们再次调用上次接口,由于我们已经借阅了该书,那么此时就会在下面x位置报出异常,问题就出现了,那么book-service这里做的-1操作就产生数据不一致问题!
来吧,测试一下:果然不出所料
来看下当前的数据库吧:
可以看到红色横线的部分就是未回滚的book-service服务,如何解决这类问题呢?我们可以集成阿里的Seata组件来进行尝试!
2.2、采用file模式来集成seata服务
2.2.1、启动seata-server
服务端下载地址:seata-server 1.4.2,由于是外网下载太慢,可使用下面链接下载
链接:https://pan.baidu.com/s/1AqmcHZY9Op2IucG7rHbjOQ
提取码:bb6f
下载解压后的目录如下:
进入到bin目录之后,我们来进行输入命令执行其中bat工具,直接来启动服务就好(默认是file模式):
seata-server.bat -p 8868
指定在8868端口来进行执行,启动效果如下:
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