Using an existing database

Question

I have a database (SQL-Server); if I connect to it, I still have to create the classes EPH and use a Migration?

Answer 1

Good afternoon, the usability of EF with Migrations goes from its implementation.

You can simply connect to the database and use it as it is. If you want to use Migrations you should do its implementation according to the documentations and tutorials spread over the internet, so when generating a database with Migration it will be based on the classes mapped with EF, and your bank already created will only undergo the divergent changes it made to the Migrations itself.

So say your bank has the Table Person with the fields Name and Age
The class in the code would be:

class Pessoa {
  public string Nome { get; set;}
  public int Idade { get; set;}
}

If you run a new Migration, a database will be created with this table as it is in the code (Code First). If you put an extra field in the code and run Migration it should update any existing database as well.

This was a theoretical explanation of Migration and its behavior, to implement it in this way consult other materials.