Springboot微服务中引入Seata

Posted 2021-08-12 lovoo

参考：http://seata.io/zh-cn/docs/overview/what-is-seata.html

Seata 是什么?

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。

处理流程图

具体实现

1、微服务图：

2、每个微服务数据库都必须创建undo_log表

CREATE TABLE`undo_log`  (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `context` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int(11) NOT NULL,
  `log_created` datetime(0) NOT NULL,
  `log_modified` datetime(0) NOT NULL,
  `ext` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE,
  UNIQUE INDEX `ux_undo_log`(`xid`, `branch_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

3、安装事务协调器seata-server

下载地址：https://download.csdn.net/download/lovoo/20258859?spm=1001.2014.3001.5501
异常处理参考：https://blog.csdn.net/lovoo/article/details/118713371?spm=1001.2014.3001.5501

4、配置seata-server

4.1，解压，
4.2，修改registry.conf文件，将type改成nacos

4.3，以管理员身份打开bin/seata-server.bat
4.4，打开nacos中心，可以看到seata-server注册成功

5、Springboot项目中引入seata

5.1，pom.xml引入

 <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
        </dependency>

5.2，在方法体上加上

@GlobalTransactional
    @Transactional
    @Override
    public SubmitOrderResponseVo submitOrder(OrderSubmitVo orderSubmitVo) {
    }

5.3，对数据源进行seata包装

@Configuration
public class MySeataConfig {

    @Autowired
    private DataSourceProperties dataSourceProperties;

    @Bean
    public DataSource dataSource(DataSourceProperties dataSourceProperties){
        DruidDataSource dataSource = dataSourceProperties.initializeDataSourceBuilder().type(DruidDataSource.class).build();
        return new DataSourceProxy(dataSource);
    }
}

5.4，每个配置文件中都添加seata-server/conf目录下的file.conf和registry.conf文件

5.5，在application.yml中添加
mall-order为微服务名称 即

spring:
 application:
   name: mall-order

 cloud:
    alibaba:
      seata:
        tx-service-group: mall-order-fescar-service-group

---

QQ群：722865146
分布式商城下载：https://gitee.com/charlinchenlin/wysmall