In the preceding section, we separated our Order module into Order Services and discussed how we can break down the foreign key relationship between ORDER and PRODUCT tables.
In a monolithic application, we have a single repository that queries the database to fetch the records from both ORDER and PRODUCT tables. However, in our upcoming microservice application, we will segregate repositories between Order Service and Product Service. With each service having its respective database, each one would access its own database only. Order Service would only be able to access order Database, whereas Product Service would be able to access product Database only. Order Service should not be allowed to access product Database and vice versa. Refer to the following image:
