Spring 启动微服务 - 从数据库中检索数据

Question

I'm new in Microservices architecture and I'm trying to build a simple projects with two spring boot microservices, eureka as service discovery and spring cloud for an API Gateway. UserService and OrderService are connected to different MySQL schema and my question is, how to retrieve data from orders_table by calling rest method through the client and passing the user id? I have a dashboard where I have to show all the orders made by the logged user.

The client project is a Spring Boot app with Web and RestTemplate dependencies.

Below the table struture:

users_table: id, name, lastName

orders_table: id, description, user_id

Thank you:)

Answer 1

You can use JPA repository to fetch the required data. You can define Entity models for you tables. JPA repository will give you CRUD operations out of the box which you can utilise to fetch data with your query.

Reference Link: https://www.baeldung.com/the-persistence-layer-with-spring-data-jpa

Answer 2

Option 1: Call user service from the dashboard application to retrieve the user_id, then make a second call from the dashboard application to get the orders for the user_id.

Option 2: Have a third service which will act as an aggregator. From the dashboard application call the aggregator, which in turn will first fetch the user_id from the user service and then the associated orders from the orders service.