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Software 2 - Class Exercise 9

Goal

Learn how to add Entity Framework Core to your project and write basic queries

Instructions

Database Setup

  1. Create a new class library project in the solution called PetStore.Data. Add a project reference from the PetStore project to the PetStore.Data.
  2. Add the nuget package Microsoft.EntityFrameworkCore.Sqlite to that project.
  3. Create a new class called ProductContext. Use this link to guide you through setting up your DbContext class. Feel free to either move the Product class or make a new class called ProductEntity. Either way, Product will need to have a property called ProductId.
  4. Run these commands to create your database. I would advise following the PowerShell commands instead of the Visual Studio ones.
  5. In the PetStore.Data project, add a class called ProductRepository and add an interface for it.
  6. In the constructor of that class, create a new instance of ProductContext and assign it to a private readonly variable.
  7. Add a method to add a product to the database. Don't forget to call the SaveChanges method.
  8. Add a method to get a product by it's id.
  9. Add a method to get all products from the database.
  10. Add the repository class to the services like you did with the ProductLogic class.
  11. In the ProductLogic class. Add a private readonly variable with the type being the interface for your repository class. Add an argument to the constructor of the logic class of the type of the interface for your repository class. Assign the argument to the private variable.
  12. Replace the AddProduct code with a call to your repositories add method.
  13. Change the GetProductByName method to no longer be generic, and change it's name to be GetProductById. Replace the contents of the method with a call to your repositories get method.

Clean Up

At this point, your application will probably have a bunch of errors. That's fine, we'll go ahead and clean those up before testing the database. Remove the following:

  • DogLeash class
  • CatFood class
  • DryCatFood class
  • The products list and both dictionaries from ProductLogic.
  • GetOnlyInStockProducts from ProductLogic
  • GetTotalPriceOfInventory from ProductLogic

Change the following:

  • Update the validator to validate products now. Add that to your ProductLogic add method.
  • Update the program class to work with the new logic class. You can remove options 3 and 4 completely.
  • There will probably be some errors in using statements to clean up at this point too, so feel free to look around and fix errors as you see them.

Test

  1. Add a product to yor database.
  2. View your product
  3. If this worked, congrats! You just setup a database and connected it to your application.