Supermarkets sell goods of various categories. The customers can shop anonymously or by logging in. When buying, a receipt is created with a list of goods purchased in a particular market.
Develop a Data Access Layer (DAL) for an electronic system "Trade Market" with Three-Layer Architecture in dynamic library form named “Data”.
The structure of the DAL project in the final form:
- The folder Entities contains classes of entities – make entities according to the diagram (Fig.). Every entity should inherit BaseEntity { int Id }.
- The folder Interfaces contains repository interfaces of entities and the interface of their merge point.
- The folder Repositories contains repository classes that implement interfaces from the folder Interfaces – implement all the repositories according to the interfaces from the Interfaces folder.
- The root folder of the project contains MarketDBContext.cs file for project entity context - implement the class MarketDBContext.
- The root folder of the project contains UnitOfWork.cs file. This class is entry point for all repositories to get access to DAL from the business logic. Implement the class UnitOfWork based on the IUnitOfWork interface.
- The folder Migrations contains project database migration files – use migrations by developing DB.
Instructions on how to create migrations can be found in file Data / Migrations_Overview.md.