4.Seata如何应用于项目？
安装seata及修改配置
4.1 官网下载Seata安装包
4.2 修改seata/config.txt
4.2.1 修改存储方式
store.db.dbType=mysql
store.db.driverClassName=com.mysql.jdbc.Driver
store.db.url=jdbc:mysql://你的IP:3306/seata?useUnicode=true
store.db.user=root
store.db.password=root
4.2.2 添加如下配置
service.vgroupMapping.demo-order=default
service.vgroupMapping.demo-storage=default
service.vgroupMapping.demo-account=default
4.3 修改seata/conf/registry.conf
4.3.1 注册中心改为nacos
registry {
# file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
type = "nacos"
nacos {
application = "seata-server"
serverAddr = "你的IP:8848"
group = "SEATA_GROUP"
namespace = ""
cluster = "default"
username = "nacos"
password = "nacos"
}
4.3.2 配置中心也改为nacos
config {
# file、nacos 、apollo、zk、consul、etcd3
type = "nacos"
nacos {
serverAddr = "你的IP:8848"
namespace = "在nacos中创建一个命名空间，用来保存seata配置，提前配置好"
group = "SEATA_GROUP"
username = "nacos"
password = "nacos"
}
4.4 执行nacos脚本，推送seata配置到nacos
sh nacos-config.sh -h 你的nacos -p 8848 -g SEATA_GROUP -t 上面创建的命名空间 -u nacos -w nacos
创建seata需要用到的表
4.4.1 创建数据库
create database seata;
4.4.2 创建相关表
global_table： 全局事务表，每当有一个全局事务发起后，就会在该表中记录全局事务的ID
branch_table： 分支事务表，记录每一个分支事务的 ID，分支事务操作的哪个数据库等信息
lock_table： 全局锁
CREATE TABLE `branch_table` (
`branch_id` bigint(20) NOT NULL,
`xid` varchar(128) NOT NULL,
`transaction_id` bigint(20) DEFAULT NULL,
`resource_group_id` varchar(32) DEFAULT NULL,
`resource_id` varchar(256) DEFAULT NULL,
`branch_type` varchar(8) DEFAULT NULL,
`status` tinyint(4) DEFAULT NULL,
`client_id` varchar(64) DEFAULT NULL,
`application_data` varchar(2000) DEFAULT NULL,
`gmt_create` datetime(6) DEFAULT NULL,
`gmt_modified` datetime(6) DEFAULT NULL,
PRIMARY KEY (`branch_id`),
KEY `idx_xid` (`xid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `global_table` (
`xid` varchar(128) NOT NULL,
`transaction_id` bigint(20) DEFAULT NULL,
`status` tinyint(4) NOT NULL,
`application_id` varchar(32) DEFAULT NULL,
`transaction_service_group` varchar(32) DEFAULT NULL,
`transaction_name` varchar(128) DEFAULT NULL,
`timeout` int(11) DEFAULT NULL,
`begin_time` bigint(20) DEFAULT NULL,
`application_data` varchar(2000) DEFAULT NULL,
`gmt_create` datetime DEFAULT NULL,
`gmt_modified` datetime DEFAULT NULL,
PRIMARY KEY (`xid`),
KEY `idx_gmt_modified_status` (`gmt_modified`,`status`),
KEY `idx_transaction_id` (`transaction_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `lock_table` (
`row_key` varchar(128) NOT NULL,
`xid` varchar(96) DEFAULT NULL,
`transaction_id` bigint(20) DEFAULT NULL,
`branch_id` bigint(20) NOT NULL,
`resource_id` varchar(256) DEFAULT NULL,
`table_name` varchar(32) DEFAULT NULL,
`pk` varchar(36) DEFAULT NULL,
`gmt_create` datetime DEFAULT NULL,
`gmt_modified` datetime DEFAULT NULL,
PRIMARY KEY (`row_key`),
KEY `idx_branch_id` (`branch_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
启动seata服务
sh seata/bin/seata-server.sh 启动成功后，监听8091端口
看下nacos中是否注册了此服务: 看到如下内容表示，seata已经安装并注册成功
项目整合seata
1. 创建父工程
在ams-demo下创建父工程demo-seata，并修改父工程打包方式为pom
2. 添加依赖
<dependencies>
<!-- 配置读取 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
</dependency>
<!-- 单元测试 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- Spring Cloud & Alibaba -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>
<!-- 注册中心 -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-loadbalancer</artifactId>
</dependency>
<!-- 配置中心 -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<dependency>
<groupId>com.ams</groupId>
<artifactId>common-mybatis-plus</artifactId>
<version>1.0.0</version>
</dependency>
<dependency>
<groupId>com.ams</groupId>
<artifactId>common-base</artifactId>
<version>${ams.version}</version>
</dependency>
<dependency>
<groupId>com.ams</groupId>
<artifactId>common-web</artifactId>
<version>${ams.version}</version>
</dependency>
<!-- openfeign依赖 1. http客户端选择okhttp 2. loadbalancer替换ribbon -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-okhttp</artifactId>
</dependency>
<!--seata 必备-->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-seata</artifactId>
</dependency>
</dependencies>
4.4.3 创建订单子模块（库存、账户子模块类似）
1. 在demo-seata下创建demo-order子模块
2. 添加创建订单的接口
/**
* @description：创建订单控接口
*/
@RestController
@RequestMapping("/order")
@RequiredArgsConstructor
public class OrderController {
private final OrderService orderService;
@RequestMapping("/createOrder")
public R createOrder() {
orderService.createOrder();
return R.ok("订单创建成功");
}
}
3. 添加创建订单的service
/**
* @description：创建订单service
*/
@Service
@RequiredArgsConstructor
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements OrderService {
private final AccountFeignService accountFeignService;
private final StorageFeignService storageFeignService;
@Override
@GlobalTransactional(name = "ams-create-order",rollbackFor = Exception.class)
public R createOrder() {
Order order = Order.builder()
.count(10)
.money(100)
.productId(1L)
.status(0)
.userId(1L)
.build();
// 创建订单
save(order);
// 扣除库存
storageFeignService.decrease(order.getProductId(), order.getCount());
// 扣余额
accountFeignService.decrease(order.getUserId(), order.getMoney());
//更新订单状态
order.setStatus(1);
updateById(order);
return R.ok();
}
}
4. 添加调用库存接口的feign
/**
* Description:调用库存接口的feign
*/
@FeignClient(value = "ams-demo-storage")
@RequestMapping("/storage")
public interface StorageFeignService {
@RequestMapping("/decrease")
public R decrease(@RequestParam("productId") Long productId, @RequestParam("count") Integer count);
}
5. 添加调用账户接口的feign
/**
* Description:调用账户接口的feign
*/
@FeignClient(value = "ams-demo-account")
@RequestMapping("/account")
public interface AccountFeignService {
@RequestMapping("/decrease")
public R decrease(@RequestParam("userId") Long userId, @RequestParam("money") Integer money);
}
6. 创建启动类
/**
* @description：订单启动类
*/
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@EnableDiscoveryClient
@EnableFeignClients
public class DemoOrderApp {
public static void main(String[] args) {
SpringApplication.run(DemoOrderApp.class, args);
}
}
7. 创建bootstrap.yml
server:
port: 20003
spring:
application:
name: ams-demo-order
cloud:
nacos:
# 注册中心
discovery:
server-addr: http://你的nacos地址:8848
# 配置中心
config:
server-addr: ${spring.cloud.nacos.discovery.server-addr}
file-extension: yaml
shared-configs[0]:
data-id: ams-common.yaml
refresh: true
alibaba:
seata:
tx-service-group: demo-order
8. 新增nacos配置：
在naocs中创建ams-demo-order.yaml配置
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://${mysql.host}:${mysql.port}/ams_order?zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&autoReconnect=true
username: ${mysql.username}
password: ${mysql.password}
redis:
database: 0
host: ${redis.host}
port: ${redis.port}
password: ${redis.password}
cache:
# 缓存类型
type: redis
# 缓存时间(单位：ms)
redis:
time-to-live: 3600000
# 缓存null值，防止缓存穿透
cache-null-values: true
# 允许使用缓存前缀，
use-key-prefix: true
# 缓存前缀，没有设置使用注解的缓存名称(value)作为前缀，和注解的key用双冒号::拼接组成完整缓存key
key-prefix: 'admin:'
mybatis-plus:
configuration:
# 驼峰下划线转换
map-underscore-to-camel-case: true
# 这个配置会将执行的sql打印出来，在开发或测试的时候可以用
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
# 全局参数设置
ribbon:
ReadTimeout: 120000
ConnectTimeout: 10000
SocketTimeout: 10000
MaxAutoRetries: 0
MaxAutoRetriesNextServer: 1
feign:
httpclient:
enabled: true
okhttp:
enabled: false
#Seata分布式事务配置(AT模式)
seata:
enabled: true
application-id: ${spring.application.name}
#客户端和服务端在同一个事务组
tx-service-group: demo-order
enable-auto-data-source-proxy: true
service:
vgroup-mapping:
demo-order: default
config:
type: nacos
nacos:
namespace: "填写在安装seata时创建的命名空间"
serverAddr: 你的nacos ip:8848
group: SEATA_GROUP
username: "nacos"
password: "nacos"
#服务注册到nacos
registry:
type: nacos
nacos:
application: seata-server
server-addr: 你的nacos ip:8848
group: SEATA_GROUP
namespace: "public"
username: "nacos"
password: "nacos"
cluster: default
logging:
level:
spring: info
9. 创建回滚表
在每个业务数据库下面创建回滚表
CREATE TABLE `undo_log` (
`branch_id` bigint(20) NOT NULL COMMENT 'branch transaction id',
`xid` varchar(128) NOT NULL COMMENT 'global transaction id',
`context` varchar(128) NOT NULL COMMENT 'undo_log context,such as serialization',
`rollback_info` longblob NOT NULL COMMENT 'rollback info',
`log_status` int(11) NOT NULL COMMENT '0:normal status,1:defense status',
`log_created` datetime(6) NOT NULL COMMENT 'create datetime',
`log_modified` datetime(6) NOT NULL COMMENT 'modify datetime',
UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='AT transaction mode undo table';
10. 验证
启动三个服务，请求：http://localhost:20003/order/createOrder,通过设置异常，观察是否全局回滚
上一篇跳转—SpringCloud之Seata（一）
本文主要参考链接：
SpringCloud实战｜8.SpringCloud 整合 seata1.3-估计是全网讲的最细的并且一次成功的
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