Table of contents
1.2 Modify the configuration file and initialize
2. Use Seata to implement transaction control
1. Start Seata
1.1 download seata
Download address: https://github.com/seata/seata/releases/v1.3.0/
1.2 Modify the configuration file and initialize
Decompress the downloaded seata (non-source package) compressed package and enter the conf directory
Modify file.conf ( non-source package)
Create the database Seata and initialize the data table (source package)
Unzip the seata-1.4.0 source package, and enter the seata-1.4.0\script\server\db directory, copy and run the mysql.sql script to complete the seata server database initialization.
Modify registry.conf (non-source package)
Decompress the downloaded seata (non-source package) compressed package and enter the conf directory
Modify the config.txt configuration in the script/config-center directory in seata-1.4.0 (source package):
Initialize Seata configuration into Nacos (non-source package)
Right-click in the seata-1.4.0\script\config-center\nacos directory and select git bash here to run the git command window. and enter the following command:sh nacos-config.sh -h localhost -p 8848 -g SEATA_GROUP -u nacos -w nacos
After the execution is successful, you can open the Nacos console. In the configuration list, you can see that many configurations with Group SEATA_GROUP initialized.
Start the seata service (non-source package)
Directly enter the seata\bin directory of the seata service, double-click to run the seata-server.bat file. Or use the following command to run:
cd bin
seata-server.bat -p 9000 -m file
seata-server.bat -h ip地址 -p 9000 -m file
2. Use Seata to implement transaction control
2.1 Initialize the data table
Enter the source package seata-1.4.0\script\client\at\db directory, copy and run the mysql.sql database script to complete the creation of the undo_log table, which is the table used by Seata to record transaction logs.
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;2.2 Add configuration
- add dependencies
Introduce the following dependencies in zmall-order and zmall-product modules respectively:
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-seata</artifactId>
</dependency>
<!-- 如果已经添加了nacos配置中心依赖，则可以不加入 -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>- DataSourceProxyConfig
Seata implements transaction branching through the proxy data source, so it is necessary to configure the Bean of io.seata.rm.datasource.DataSourceProxy, which is the default data source of @Primary, otherwise the transaction will not be rolled back and distributed transactions cannot be realized. Please add the DruidDataSource configuration class in zmall-order , as follows:
package com.zking.zmall.config;
import com.alibaba.druid.pool.DruidDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import io.seata.rm.datasource.xa.DataSourceProxyXA;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import javax.sql.DataSource;
@Configuration
public class DataSourceProxyConfig {
@Bean
@ConfigurationProperties(prefix = "spring.datasource")
public DruidDataSource druidDataSource() {
return new DruidDataSource();
}
@Primary
@Bean("dataSourceProxy")
public DataSource dataSource(DruidDataSource druidDataSource) {
//AT模式
return new DataSourceProxy(druidDataSource);
//XA模式
//return new DataSourceProxyXA(druidDataSource);
}
}- Exclude the DataSource data source auto-configuration class on the startup class
@EnableFeignClients
@EnableDiscoveryClient
@MapperScan({"com.zking.zmall.mapper"})
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class ZmallOrderApplication {
public static void main(String[] args) {
SpringApplication.run(ZmallOrderApplication.class, args);
}
}Perform the following configurations in microservices that require distributed transactions:
- application.yml
spring:
datasource:
#type连接池类型 DBCP,C3P0,Hikari,Druid,默认为Hikari
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/zmall?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true
username: root
password: 1234
- registry.conf
Add the seata configuration file registry.conf in the resources directory of the microservice module, which comes from the configuration file in the seata-server/conf directory.
registry {
type = "nacos"
nacos {
serverAddr = "localhost"
namespace = "public"
cluster = "default"
}
}
config {
type = "nacos"
nacos {
serverAddr = "localhost"
namespace = "public"
cluster = "default"
}
}- bootstrap.yaml
spring:
application:
name: service-product
cloud:
nacos:
config:
server-addr: localhost:8848 # nacos的服务端地址
namespace: public
group: SEATA_GROUP
alibaba:
seata:
tx-service-group: my_test_tx_group- Start a global transaction in the order microservice
@GlobalTransactional //seata全局事务控制
@Transactional
@Override
public Order createOrder(Integer pid, Integer num) {
//根据商品ID修改商品对应的库存
productService.updateStock(pid,num);
//模拟程序执行报错
int i=1 / 0;
//新增订单
Order order=new Order();
//此处只是做模拟操作
this.save(order);
return order;
}