✅P290_商城业务-分布式事务-Seata分布式事务体验
大约 3 分钟
创建undo_log表
每个微服务的数据库都创建undo_log表，
CREATE TABLE `undo_log` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`branch_id` bigint(20) NOT NULL,
`xid` varchar(100) 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=1 DEFAULT CHARSET=utf8;
导入Seata依赖
为需要回滚的服务导入Seata依赖，本项目中cfmall-product、cfmall-ware、cfmall-order服务导入此依赖
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-seata</artifactId>
<version>2.1.0.RELEASE</version>
<exclusions>
<exclusion>
<groupId>io.seata</groupId>
<artifactId>seata-all</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>io.seata</groupId>
<artifactId>seata-all</artifactId>
<version>1.1.0</version>
</dependency>
安装seata-server-1.1.0
官方地址：https://github.com/seata/seata/releases
下载完成后进行配置，file.conf内容如下：
transport {
# tcp udt unix-domain-socket
type = "TCP"
#NIO NATIVE
server = "NIO"
#enable heartbeat
heartbeat = true
# the client batch send request enable
enableClientBatchSendRequest = false
#thread factory for netty
threadFactory {
bossThreadPrefix = "NettyBoss"
workerThreadPrefix = "NettyServerNIOWorker"
serverExecutorThreadPrefix = "NettyServerBizHandler"
shareBossWorker = false
clientSelectorThreadPrefix = "NettyClientSelector"
clientSelectorThreadSize = 1
clientWorkerThreadPrefix = "NettyClientWorkerThread"
# netty boss thread size,will not be used for UDT
bossThreadSize = 1
#auto default pin or 8
workerThreadSize = "default"
}
shutdown {
# when destroy server, wait seconds
wait = 3
}
serialization = "seata"
compressor = "none"
}
# service configuration, only used in client side
service {
#transaction service group mapping
vgroupMapping.my_test_tx_group = "default"
#only support when registry.type=file, please don't set multiple addresses
default.grouplist = "127.0.0.1:8091"
#degrade, current not support
enableDegrade = false
#disable seata
disableGlobalTransaction = false
}
#client transaction configuration, only used in client side
client {
rm {
asyncCommitBufferLimit = 10000
lock {
retryInterval = 10
retryTimes = 30
retryPolicyBranchRollbackOnConflict = true
}
reportRetryCount = 5
tableMetaCheckEnable = false
reportSuccessEnable = false
sqlParserType = druid
}
tm {
commitRetryCount = 5
rollbackRetryCount = 5
}
undo {
dataValidation = true
logSerialization = "jackson"
logTable = "undo_log"
}
log {
exceptionRate = 100
}
}
registry.conf 修改后内容如下：将type改为nacos，将nacos{...}中的serverAddr、username、password修改为适配自己环境的内容
registry {
# file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
type = "nacos"
nacos {
serverAddr = "127.0.0.1:8848"
namespace = ""
cluster = "default"
username = "nacos"
password = "nacos"
}
eureka {
serviceUrl = "http://localhost:8761/eureka"
application = "default"
weight = "1"
}
redis {
serverAddr = "localhost:6379"
db = "0"
}
zk {
cluster = "default"
serverAddr = "127.0.0.1:2181"
session.timeout = 6000
connect.timeout = 2000
}
consul {
cluster = "default"
serverAddr = "127.0.0.1:8500"
}
etcd3 {
cluster = "default"
serverAddr = "http://localhost:2379"
}
sofa {
serverAddr = "127.0.0.1:9603"
application = "default"
region = "DEFAULT_ZONE"
datacenter = "DefaultDataCenter"
cluster = "default"
group = "SEATA_GROUP"
addressWaitTime = "3000"
}
file {
name = "file.conf"
}
}
config {
# file、nacos 、apollo、zk、consul、etcd3
type = "file"
nacos {
serverAddr = "localhost"
namespace = ""
group = "SEATA_GROUP"
}
consul {
serverAddr = "127.0.0.1:8500"
}
apollo {
app.id = "seata-server"
apollo.meta = "http://192.168.1.204:8801"
namespace = "application"
}
zk {
serverAddr = "127.0.0.1:2181"
session.timeout = 6000
connect.timeout = 2000
}
etcd3 {
serverAddr = "http://localhost:2379"
}
file {
name = "file.conf"
}
}
启动seata-server，双击seata-server.bat
查看Nacos中的服务列表，seata-server服务已被注册
服务配置
将file.conf、registry.conf复制到项目cfmall-product、cfmall-ware、cfmall-order服务中，如下图所示。
cfmall-order-fescar-service-group与.yml中tx-service-group命名一致，命名规则：服务名-fescar-service-group
spring:
cloud:
alibaba:
seata:
tx-service-group: cfmall-order-fescar-service-group
如果其它服务用到seata-server，同样的配置。
分布式事务入口com.gyz.cfmall.order.service.impl.OrderServiceImpl#submitOrder方法添加全局事务注解：@GlobalTransactional，
每一个远程的小事务添加@Transactional注解；
数据源代理
所有想要用到分布式事务的微服务需使用seata-DataSourceProxy代理自己的数据源。
注意：seata在1.0.0版本之后就不需要手动进行数据源代理，已经被自动代理
package com.gyz.cfmall.order.config;
import com.zaxxer.hikari.HikariDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.StringUtils;
import javax.sql.DataSource;
/**
* @author: gongyuzhuo
* @since: 2024-02-05 18:07
* @description:
*/
@Configuration
public class MySeataConfig {
@Autowired
private DataSourceProperties dataSourceProperties;
@Bean
public DataSource dataSource(DataSourceProperties dataSourceProperties) {
HikariDataSource dataSource = dataSourceProperties.initializeDataSourceBuilder().type(HikariDataSource.class).build();
if (StringUtils.hasText(dataSourceProperties.getName())) {
dataSource.setPoolName(dataSourceProperties.getName());
}
return new DataSourceProxy(dataSource);
}
}
测试事务回滚
实现目标：
在com.gyz.cfmall.order.service.impl.OrderServiceImpl#submitOrder方法中，逻辑是订单回滚、库存不回滚
手动设置了异常代码int i = 10/0；
查看数据库库存表wms_ware_sku和订单表oms_order的变化是否是正常回滚效果。