目录
- 准备
- 调整db配置
- 准备创建数据库
- seata配置nacos
- 配置confi.txt
- 下载向nacos推送配置的脚本
- 启动seata
- 新建项目
- order-seata项目 订单项目
- 数据库脚本
- pom.xml
- application.yml
- 启动类
- 实体类
- dao类
- service类
- controller类
- feign类
- mapper类
- stock-seata 库存项目
- 数据库脚本
- pom.xml
- application.yml
- 启动类
- 实体类
- dao类
- service类
- controller类
- mapper类
- 测试
- 特殊情况
- 分布式事务
- order-seata项目变动
- pom.xml
- application.yml
- controller
- stock-seata项目变动
- pom.xml
- application.yml
- 脚本
- 效果
- 分布式事务原理
- nacos配置问题
- seata的几个表都是什么情况
准备
名称 | 版本 |
---|---|
Nacos | 1.4.5 |
seata | 1.4.0 |
alibabacloud | 2.2.5.RELEASE |
- 本博客版本
seata官网地址
seata安装包下载
- 没有linux服务器,可本地搭建玩一下
- 注意alibaba版本跟seata版本一定要严格控制,不然会出现一些奇奇怪怪的问题
默认数据存储分为2钟,一种是存在bin目录下的root.data文件里面,还有一种是db方式,本文使用db模式
调整db配置
- 注意mysql数据库的版本得5.7以上。-
- 修改配置文件之前,别慌,先copy一遍再说,养成好习惯
- 调整模式为db, 修改db对应的配置
准备创建数据库
mysql脚本下载地址
- 先把整个项目下载,然后到这个目录下,找到mysql.sql
seata配置nacos
- 先备份一下配置文件
- 删除其他没有用的配置,调整一下配置
配置confi.txt
到之前下载好的依赖包中copy对应的config.txt文件,放到seata目录下
- 修改存储类型
- 调整为自己对应的url地址,以及账号和密码
下载向nacos推送配置的脚本
- 将该脚本移动到seata的conf配置下
sh nacos-config.sh -h 127.0.0.1 -p 8848 -g SEATA_GROUP -t seata -u nacos -w nacos
# h: nacos服务ip.
# p: nacos服务端口号.
# g: 想要的分组信息.
# t: 第一步新建的命名空间.
# u: nacos登录名.
# w: nacos登录密码
如果是本地没有做任务的修改,直接运行就行
- 大概运行5分钟左右
- 很奇葩的设计,搞不懂为什么不单独弄一个文件来存储所有的内容,而是key value的方式,看起来很乱,建议单独创建一个seata的命令空间用来存储这些配置
启动seata
- window启动用bat文件
- 可以看出默认端口为8091,也可以自定义
- 在服务列表中,就可以看到多了一个seata-server的服务
- 因为window版本,不好演示集群方式,所以我这里的集群数量是1
新建项目
在之前的基础上新增一个seata项目
-
注意,新增后,该项目是没有蓝点的
-
添加+号,解决蓝点问题
-
自己手动补一下seata这个目录
-
创建模块order-seata和stock-seata
order-seata项目 订单项目
- 新增这两个项目
- 库存项目的结构
数据库脚本
create database seata_order;
use seata_order;CREATE TABLE `order_tbl` (`id` int(11) NOT NULL AUTO_INCREMENT,`product_id` varchar(200) DEFAULT NULL,`total_amount` decimal(10,3) DEFAULT NULL,`statu` int(11) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8
- 新增数据库
pom.xml
<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/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.lcs.springcloud</groupId><artifactId>springcloudalibaba</artifactId><version>0.0.1-SNAPSHOT</version></parent><artifactId>order-nacos</artifactId><packaging>jar</packaging><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><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><exclusions><exclusion><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-ribbon</artifactId></exclusion></exclusions></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId><exclusions><exclusion><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-netflix-ribbon</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-loadbalancer</artifactId></dependency></dependencies><build><finalName>order</finalName></build>
</project>
application.yml
server:port: 8190spring:application:name: order-seatacloud:nacos:discovery:namespace: publicserver-addr: localhost:8848username: nacospassword: nacosdatasource:type: com.alibaba.druid.pool.DruidDataSourcedruid:db-type: mysqldriver-class-name: com.mysql.jdbc.Driverurl: jdbc:mysql://192.168.10.108:3306/seata_order?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true&useCursorFetch=trueusername: rootpassword: 12312312
mybatis:mapper-locations: classpath:mapper/*.xml
启动类
package com.lcs.springcloud;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;@SpringBootApplication
@MapperScan("com.lcs.springcloud.dao")
@EnableFeignClients
public class OrderSeataApplication {public static void main(String[] args) {SpringApplication.run(OrderSeataApplication.class);}
}
实体类
package com.lcs.springcloud.entity;import java.math.BigDecimal;public class OrderTbl {private Integer id;private String product_id;private BigDecimal total_amount;private Integer statu;public OrderTbl() {}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getProduct_id() {return product_id;}public void setProduct_id(String product_id) {this.product_id = product_id;}public BigDecimal getTotal_amount() {return total_amount;}public void setTotal_amount(BigDecimal total_amount) {this.total_amount = total_amount;}public Integer getStatu() {return statu;}public void setStatu(Integer statu) {this.statu = statu;}@Overridepublic String toString() {return "OrderTbl{" +"id=" + id +", product_id='" + product_id + '\'' +", total_amount=" + total_amount +", statu=" + statu +'}';}
}
dao类
package com.lcs.springcloud.dao;import com.lcs.springcloud.entity.OrderTbl;
import org.springframework.stereotype.Repository;@Repository
public interface OrderDao {void insert(OrderTbl orderTbl);
}
service类
package com.lcs.springcloud.service;import com.lcs.springcloud.dao.OrderDao;
import com.lcs.springcloud.entity.OrderTbl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Service
public class OrderService {@AutowiredOrderDao orderDao;public void insert(OrderTbl orderTbl) {orderDao.insert(orderTbl);}
}
controller类
package com.lcs.springcloud.controller;import com.lcs.springcloud.entity.OrderTbl;
import com.lcs.springcloud.feign.StockOpenFeign;
import com.lcs.springcloud.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.math.BigDecimal;@RestController
@RequestMapping("/order")
public class OrderController {@AutowiredOrderService orderService;@AutowiredStockOpenFeign stockOpenFeign;@RequestMapping("/add")public String add(){OrderTbl orderTbl = new OrderTbl();orderTbl.setProduct_id("10");orderTbl.setTotal_amount(new BigDecimal(3000));orderTbl.setStatu(0);orderService.insert(orderTbl);String reduct = stockOpenFeign.reduct(orderTbl.getProduct_id());return "add order "+reduct;}
}
feign类
package com.lcs.springcloud.controller;import com.lcs.springcloud.entity.OrderTbl;
import com.lcs.springcloud.feign.StockOpenFeign;
import com.lcs.springcloud.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.math.BigDecimal;@RestController
@RequestMapping("/order")
public class OrderController {@AutowiredOrderService orderService;@AutowiredStockOpenFeign stockOpenFeign;@RequestMapping("/add")public String add(){OrderTbl orderTbl = new OrderTbl();orderTbl.setProduct_id("10");orderTbl.setTotal_amount(new BigDecimal(3000));orderTbl.setStatu(0);orderService.insert(orderTbl);String reduct = stockOpenFeign.reduct(orderTbl.getProduct_id());return "add order "+reduct;}
}
mapper类
<?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.lcs.springcloud.dao.OrderDao"><!-- 主键自增长的插入 --><insert id="insert" parameterType="com.lcs.springcloud.entity.OrderTbl" useGeneratedKeys="true" keyProperty="id">insert into order_tbl(product_id,total_amount,statu) values(#{product_id},#{total_amount},#{statu});</insert>
</mapper>
stock-seata 库存项目
数据库脚本
create database seata_stock;
use seata_stock;CREATE TABLE `stock_tbl` (`id` int(11) NOT NULL AUTO_INCREMENT,`product_id` varchar(200) DEFAULT NULL,`count` int(11) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8INSERT INTO `seata_stock`.`stock_tbl` (`id`, `product_id`, `count`) VALUES (1, '10', 100);
pom.xml
<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/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.lcs.springcloud</groupId><artifactId>springcloudalibaba</artifactId><version>0.0.1-SNAPSHOT</version></parent><artifactId>stock-seata</artifactId><packaging>jar</packaging><dependencies><!-- Nacos服务注册发现--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><!--继承了父项目,不需要添加版本号--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- jdbc --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId><version>2.3.5.RELEASE</version></dependency><!-- mybatis --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.2</version><!-- 排除冲突的jar包文件--><exclusions><exclusion><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></exclusion></exclusions></dependency><!--Mysql驱动器--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.18</version><scope>runtime</scope></dependency><!-- druid--><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.9</version></dependency></dependencies><build><finalName>order-seata</finalName></build>
</project>
application.yml
server:port: 8200spring:application:name: stock-seatacloud:nacos:discovery:namespace: publicserver-addr: localhost:8848username: nacospassword: nacosdatasource:type: com.alibaba.druid.pool.DruidDataSourcedruid:db-type: mysqldriver-class-name: com.mysql.jdbc.Driver#url: jdbc:mysql://10.153.96.31:3306/iomm-collection?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true&useCursorFetch=trueurl: jdbc:mysql://112.74.51.171:3306/seata_stock?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true&useCursorFetch=trueusername: rootpassword: Zy_746498
mybatis:mapper-locations: classpath:mapper/*.xml
启动类
package com.lcs.springcloud;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
@MapperScan("com.lcs.springcloud.dao")
public class StockSeataApplication {public static void main(String[] args) {SpringApplication.run(StockSeataApplication.class,args);}
}
实体类
package com.lcs.springcloud.entity;public class StockTbl {private Integer id;private String product_id;private Integer count;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getProduct_id() {return product_id;}public void setProduct_id(String product_id) {this.product_id = product_id;}public Integer getCount() {return count;}public void setCount(Integer count) {this.count = count;}
}
dao类
package com.lcs.springcloud.dao;import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;@Repository
public interface StockDao {void updateStock(@Param("product_id")String product_id);
}
service类
package com.lcs.springcloud.service;import com.lcs.springcloud.dao.StockDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Service
public class StockService {@AutowiredStockDao stockDao;public String updateStock(String product_id) {try {stockDao.updateStock(product_id);return "扣减库存成功";}catch (Exception e){return "更新库存失败";}}
}
controller类
package com.lcs.springcloud.controller;import com.lcs.springcloud.service.StockService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/stock")
public class StockController {@AutowiredStockService stockService;@Value("${server.port}")String port;@RequestMapping("/reduct")public String reduct(@RequestParam(value = "product_id") String product_id){return stockService.updateStock(product_id);}}
mapper类
<?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.lcs.springcloud.dao.StockDao"><!-- 主键自增长的插入 --><update id="updateStock" parameterType="java.lang.String" >update stock_tbl SET count= count-1 where product_id=#{product_id}</update>
</mapper>
测试
前提: 保持已经开启nacos,不知道的可以先学习一下nacos
- 订单表 默认为空
- 库存表默认为100个库存
运行http://localhost:8190/order/add
结果如下:
- 订单表新增一条记录,库存表-1,说明项目搭建成功
特殊情况
已知: order和stock是两个库
把order的controller代码,改一下
package com.lcs.springcloud.controller;import com.lcs.springcloud.entity.OrderTbl;
import com.lcs.springcloud.feign.StockOpenFeign;
import com.lcs.springcloud.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.math.BigDecimal;@RestController
@RequestMapping("/order")
public class OrderController {@AutowiredOrderService orderService;@AutowiredStockOpenFeign stockOpenFeign;@RequestMapping("/add")@Transactionalpublic String add(){OrderTbl orderTbl = new OrderTbl();orderTbl.setProduct_id("10");orderTbl.setTotal_amount(new BigDecimal(3000));orderTbl.setStatu(0);//1. 插入订单orderService.insert(orderTbl);//2. 扣减库存String reduct = stockOpenFeign.reduct(orderTbl.getProduct_id());// 3. 出现问题int a= 1/0;return "add order "+reduct;}
}
- 都知道0不能作为分母,必报错, 大家说一下这个接口是多少?
订单插入进行了回滚,库存表进行扣减库存,为什么?
这是因为@transaction事物是不支持跨库回滚的。
分布式事务
代码版本在上续上面做改动,请保证上面能先运行后, 再看该步骤
order-seata项目变动
pom.xml
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-seata</artifactId><version>2.2.5.RELEASE</version></dependency><dependency><groupId>cglib</groupId><artifactId>cglib</artifactId><version>3.3.0</version></dependency>
- 为什么加了一个cglib的包?
- 报cg相关的一个错,猜测估计是依赖冲突的问题,查了一下项目依赖,发现只有可能cglib的问题
application.yml
server:port: 8190spring:application:name: order-seatacloud:nacos:discovery:namespace: publicserver-addr: localhost:8848username: nacospassword: nacosalibaba:seata:tx-service-group: default_tx_groupdatasource:type: com.alibaba.druid.pool.DruidDataSourcedruid:db-type: mysqldriver-class-name: com.mysql.jdbc.Driverurl: jdbc:mysql://127.0.0.1:3306/seata_order?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true&useCursorFetch=trueusername: rootpassword: 123456
mybatis:mapper-locations: classpath:mapper/*.xmlseata:registry:#配置seata的注册中心type: nacosnacos:### nacos服务器地址server-addr: localhost:8848username: nacospassword: nacos### nacos服务名application: seata-serverconfig:type: nacosnacos:### nacos服务器地址server-addr: localhost:8848username: nacospassword: nacosgroup: SEATA_GROUP
- 为什么叫这个名字,看自己seata-server的配置
- 这里标红的,就是我们需要填写的名字,在网上可以查到很多叫guangzhou的,这是因为别人重命名咯
controller
- 注解改为@GlobalTransactional,表示是分布式事务
stock-seata项目变动
pom.xml
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-seata</artifactId><version>2.2.5.RELEASE</version></dependency><dependency><groupId>cglib</groupId><artifactId>cglib</artifactId><version>3.3.0</version></dependency>
application.yml
server:port: 8200spring:application:name: stock-seatacloud:nacos:discovery:namespace: publicserver-addr: localhost:8848username: nacospassword: nacosalibaba:seata:tx-service-group: default_tx_groupdatasource:type: com.alibaba.druid.pool.DruidDataSourcedruid:db-type: mysqldriver-class-name: com.mysql.jdbc.Driverurl: jdbc:mysql://127.0.0.1:3306/seata_stock?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true&useCursorFetch=trueusername: rootpassword: 123456
mybatis:mapper-locations: classpath:mapper/*.xmlseata:registry:#配置seata的注册中心type: nacosnacos:### nacos服务器地址server-addr: localhost:8848username: nacospassword: nacos### nacos服务名application: seata-serverconfig:type: nacosnacos:### nacos服务器地址server-addr: localhost:8848username: nacospassword: nacosgroup: SEATA_GROUP
- 跟order项目类似,就是client跟seata以及nacos进行通信
脚本
CREATE TABLE `undo_log` (`id` bigint(20) NOT NULL AUTO_INCREMENT,`branch_id` bigint(20) NOT NULL,`xid` varchar(100) NOT NULL,`context` varchar(128) NOT NULL,`rollback_info` longblob NOT NULL,`log_status` int(11) NOT NULL,`log_created` datetime NOT NULL,`log_modified` datetime NOT NULL,`ext` varchar(100) DEFAULT NULL,PRIMARY KEY (`id`),UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
- 涉及到分布式事务的库,都需要新增该undo-log得表,他会记录修改前,以及修改后的sql,以便逆向回滚
- 例如你执行了新增,逆向就是删除
效果
- order表
- 库存表
执行http://localhost:8190/order/add,查看数据库,出现异常后
- 之前使用@transation是,订单回滚,库存减咯
- 选择使用@globaTransation注解,订单回滚,库存不变
分布式事务原理
nacos配置问题
启动后,在bin下面多了一个store开头的文件夹,why?
我不是改成db模式吗?为什么配置没有生效,查了半天,才发现nacos的配置,竟然是默认的
- 搜索store.mode*改成db
启动项目后,竟然报数据库的一个错误,怎么可能,我数据库的配置,都是copy的项目里面,不可能出问题,那原因只有一个,就是nacos里面的初始化配置又有问题
- 修改nacos这三个的配置,再启动项目,seata得bin下面,没有文件夹生成,说明切换成db模式成功
seata的几个表都是什么情况
- seata的表
- 这是seata的一个流程图
- 输入http://localhost:8190/order/add,在进入方法的时候打入断点
- global_table表生成了一个xid 拼接方式是ip+端口再加一个唯一id
- xid 全局事务id
- application_id 应用id
- transaction_service_group 分组
- transaction_name 事物加在那个方法上面(以前有个版本会标注在具体类具体方法),新版本后,变动了,好奇他底层是什么映射的,知道的,可以下方交流一下
- 断点执行到这里
- branch_table 表新增了一条数据,这个是分支Xid
- 订单库的undo-log,也新增了一条数据
- lock_table表变化会存储锁表的信息
- pk就是主键的id
#到order库调用该sql,查看blob存放的内容
select CONVERT(t.rollback_info USING utf8) from undo_log t
- 如下图
- 因为是插入语句,所以beforeImage之前是没有数据的,afterImage存放的就是修改后的数据
断点走完后,所有的seata表数据都会回滚,如果遇到异常退出的情况,请先清空表数据
代码下载