Seata入门案例

先完nacos的安装与seata服务端的安装 以及配置文件导入

nacos安装详细教程https://mp.youkuaiyun.com/mp_blog/creation/editor/107505689seata服务端安装教程https://mp.youkuaiyun.com/mp_blog/creation/editor/121103159seata配置导入nacos配置中心教程https://mp.youkuaiyun.com/mp_blog/creation/editor/120993190案例使用框架版本

 项目结构如下

 1.搭建父工程demo

新建springboot项目

勾选type为pom

修改pom.xml

添加springboot/springcloud/springcloudalibaba的依赖

<?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>
    <groupId>com.daxiang</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <modules>
        <module>order</module>
        <module>store</module>
        <module>generator</module>
    </modules>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <packaging>pom</packaging>

    <properties>
        <java.version>1.8</java.version>
        <com.alibaba.cloud.version>2.2.6.RELEASE</com.alibaba.cloud.version>
        <spring.cloud.version>Hoxton.SR9</spring.cloud.version>
        <spring.boot.version>2.3.2.RELEASE</spring.boot.version>
        <mybatis.plus.version>3.4.3.4</mybatis.plus.version>
        <mysql.connector.version>8.0.26</mysql.connector.version>
        <com.github.xiaoymin>1.9.6</com.github.xiaoymin>
        <io.springfox>2.9.2</io.springfox>
    </properties>

    <!-- 只管理版本 子模块不会直接继承改依赖,需要显示声明才能继承-->
    <dependencyManagement>
        <dependencies>
            <!--springcloudalibaba依赖-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${com.alibaba.cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--springcloud依赖-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring.cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--springboot依赖-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--mybatis-plus-->
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>${mybatis.plus.version}</version>
            </dependency>
            <!--mysql驱动-->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.connector.version}</version>
                <scope>runtime</scope>
            </dependency>


        </dependencies>
    </dependencyManagement>
    <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.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

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

        <!--swagger依赖-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>${com.github.xiaoymin}</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${io.springfox}</version>
        </dependency>

        <!--nacos注册中心依赖-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <!--openfeign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

    </dependencies>

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

</project>

1.添加<packaging>pom</packaging>

2.我这里将springboot的依赖放到了<dependencyManagement>标签中

 2.搭建order/store子项目

右键父项目,选择新建->module

 

 点击完成

使用相同的方式创建store子项目

3.添加依赖

 由于我们子项目需要连接数据库,操作数据库,

order中的pom.xml

<?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">
    <parent>
        <artifactId>demo</artifactId>
        <groupId>com.daxiang</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.daxiang.order</groupId>
    <artifactId>order</artifactId>

    <dependencies>
        <!--由于以下这2个依赖在父工程中是在dependencyManagement标签中 所以子项目引用需要显示的依赖 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--seata依赖 版本在父工程中的springcloudalibaba中已被管理-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
        </dependency>
    </dependencies>
</project>

store的pom.xml

<?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">
    <parent>
        <artifactId>demo</artifactId>
        <groupId>com.daxiang</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.daxiang.store</groupId>
    <artifactId>store</artifactId>

    <dependencies>
        <!--由于以下这2个依赖在父工程中是在dependencyManagement标签中 所以子项目引用需要显示的依赖 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--seata依赖 版本在父工程中的springcloudalibaba中已被管理-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
        </dependency>
    </dependencies>
</project>

4.添加启动类与配置文件

特别说明: 我的controller/mapper/pojo/service包是通过mybatis-plus的代码生成器生成的不了解的可以下看下这篇博客mybatis-plus代码生成工具使用教程https://mp.youkuaiyun.com/mp_blog/creation/editor/120528799

 

 

 5.配置文件中添加配置

1.整合mybatis-plus的配置

# 数据源配置
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: root
    url: jdbc:mysql://127.0.0.1:3306/blogs?characterEncoding=UTF-8&serverTimezone=GMT%2B8

# mybatis-plus配置
mybatis-plus:
  type-aliases-package: com.daxiang.store.pojo
  mapper-locations: classpath:mapper/*.xml
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

2.整合nacos配置

# nacos注册中心配置
spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        namespace: e6325d8c-07b3-41ef-8037-13630936861d
        password: nacos
        username: nacos
        enabled: true

 这里namespace是我之前在nacos中新建了有个命名空间

具体在上面的nacos教程中有介绍

3.整合seata配置

# seata配置
seata:
  config:
    type: nacos
    nacos:
      server-addr: 127.0.0.1:8848
      group: SEATA_GROUP
      namespace: ""
      username: nacos
      password: nacos
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: 127.0.0.1:8848
      group: SEATA_GROUP
      namespace: ""
      username: nacos
      password: nacos
# 事务分组配置 这里配置的名称需要与nacos中	service.vgroupMapping后面的一致
spring:
  cloud:
    alibaba:
      seata:
        tx-service-group: my_test_tx_group

 

 

完整的store配置如下 order配置只有端口号与项目名称不一样

server:
  port: 8081

# 配置数据源
spring:
  application:
    name: store
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: root
    url: jdbc:mysql://127.0.0.1:3306/blogs?characterEncoding=UTF-8&serverTimezone=GMT%2B8
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        namespace: e6325d8c-07b3-41ef-8037-13630936861d
        password: nacos
        username: nacos
        enabled: true
    alibaba:
      seata:
        tx-service-group: my_test_tx_group
# mybatis-plus配置
mybatis-plus:
  type-aliases-package: com.daxiang.store.pojo
  mapper-locations: classpath:mapper/*.xml
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
ribbon:
  nacos:
    enabled: true

seata:
  config:
    type: nacos
    nacos:
      server-addr: 127.0.0.1:8848
      group: SEATA_GROUP
      namespace: ""
      username: nacos
      password: nacos
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: 127.0.0.1:8848
      group: SEATA_GROUP
      namespace: ""
      username: nacos
      password: nacos

最后还需要在启动类上添加注解

 openfigen的注解与mybatis的注解

6.添加业务代码

业务流程:

order远程调用store 两个服务都删除一条数据库数据 测试分布式事务是否起作用

1.在store中添加删除数据接口

 2.在order中添加fegin远程调用接口

 

 3.在order中添加删除数据接口

 

 接口上添加注解@GlobalTransactional

 第一次在没有制造异常的情况下,删除成功

 第二次手动添加一个1/0的异常,再次执行

 

 开始远程调用的时候执行了删除 由于在order中抛出了by zero的异常 导致回滚

最终该数据未被删除,分布式事务起作用了

seata服务端控制台日志