SpringCloud uses Seata to implement distributed transactions, ensuring consistency and Data integrity in a distributed environment
Maven coordinates of dependent class libraries:
<dependency>
<groupId>io.seata</groupId>
<artifactId>seata-all</artifactId>
<version>1.4.0</version>
</dependency>
Seata is an open source distributed transaction solution that can guarantee consistency and Data integrity in a distributed environment. It supports multiple technology stacks such as SpringCloud and can be integrated with common relational databases such as MySQL and Oracle.
Here is a simple example of using Seata to implement distributed transactions:
1. Configure Seata
Firstly, it is necessary to configure the data source in the configuration file of the Seata Server.
service {
vgroupMapping.my_test_tx_group = "default"
}
store {
mode = "db"
db {
driverClassName = "com.mysql.jdbc.Driver"
url = "jdbc:mysql://127.0.0.1:3306/seata"
username = "seata"
password = "seata"
}
}
2. Write business services
Create a SpringBoot project and introduce Seata's dependencies.
<dependency>
<groupId>io.seata</groupId>
<artifactId>seata-spring-boot-starter</artifactId>
<version>1.4.0</version>
</dependency>
Write code for business services.
@RestController
@RequestMapping("/order")
public class OrderController {
@Resource
private OrderService orderService;
@PostMapping("/create")
public String createOrder(@RequestBody Order order) {
orderService.createOrder(order);
Return "Order created successfully";
}
}
@Service
public class OrderService {
@GlobalTransactional
public void createOrder(Order order) {
//Business logic for creating orders
//Simulated anomaly
if (order.getAmount() >= 1000) {
Throw new RuntimeException ("Order amount exceeds limit");
}
}
}
3. Configure SpringCloud
Add the configuration of Seata to the configuration file.
yaml
spring:
cloud:
alibaba:
seata:
tx-service-group: my_test_tx_group
enable-auto-data-source-proxy: true
4. Start Seata Server and Business Services
Start the Seata Server first, and then start the business services.
5. Testing Distributed Transactions
Conduct testing by sending HTTP requests.
shell
$ curl -X POST -d '{"amount": 500}' http://localhost:8080/order/create
The output result is "Order creation successful", indicating successful execution of distributed transactions.
shell
$ curl -X POST -d '{"amount": 1500}' http://localhost:8080/order/create
The output result is "Order amount exceeds the limit", indicating that the distributed transaction rollback was successful.
Summary:
By using Seata, we can easily achieve the consistency and Data integrity of distributed transactions. Seata provides a comprehensive solution that supports various technology stacks such as SpringCloud and can integrate with common relational databases. When using Seata, it is necessary to configure the Seata Server and business services, and then use the '@ GlobalTransactional' annotation to mark the methods that require distributed transaction management.
