如何使用实体框架生成与SQL Server兼容的数据库（代码优先）

Question

I was following this tutorial https://www.freecodecamp.org/news/an-awesome-guide-on-how-to-build-restful-apis-with-asp-net-core-87b818123e28/ and I got everything right and working but this example API is using the InMemoryDatabase option. I want to use a SQL Server database with it (I'm using the code first approach).

I have tried to create a database with no tables in SQL Server Management Studio and use a connection string with the following code in my Startup class, and it is working and saving data to the database but it does not appear in SQL Server Management Studio.

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
    services.AddDbContext<GameCollectionDbContext>(options =>
             {
                  options.UseSqlServer(Configuration.GetConnectionString("DBGAMESCOLLECTION"));
                  // options.UseInMemoryDatabase("GAME_COLLECTION_DB");
             });

    services.AddScoped<IUsersRepository, UsersRepository>();
    services.AddScoped<ICollectionsRepository, CollectionsRepository>();
    services.AddScoped<IGamesRepository, GamesRepository>();

    services.AddScoped<IUsersService, UsersService>();
    services.AddScoped<ICollectionsService, CollectionsService>();
    services.AddScoped<IGamesService, GamesService>();

    services.AddScoped<IUnitOfWork, UnitOfWork>();
    services.AddAutoMapper();
}

My appsettings.json looks like this

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "ConnectionStrings": {
     "DBGAMESCOLLECTION": "Server=(localdb)\\mssqllocaldb;Database=GAMES_COLLECTION_DB;Trusted_Connection=True;MultipleActiveResultSets=true"
   },
   "AllowedHosts": "*"
 }

All I want is to make Entity Framework create the database in my local machine based on the models I declared and the resulting database to be available in SQL Server for making queries and stored procedures.

(UPDATE)

I guess I should be clearer. I created my REST API with a code first approach because I expected to create models and based on that get a database file or script. It is the first time I implemented EF all by myself so at first I used the InMemoryDatabase option for my context but I knew that was only for testing purposes. After the API worked as expected I moved on to use a real database for persistance. So I added this to my Startup.cs

 public void ConfigureServices(IServiceCollection services)
 {
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        services.AddDbContext<GameCollectionDbContext>(options =>
        {
            options.UseSqlServer(Configuration.GetConnectionString("DBGAMESCOLLECTION"));
            //options.UseInMemoryDatabase("GAME_COLLECTION_DB");

        });
}

And my appsettings.json ended like this.

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "ConnectionStrings": {
    "DBGAMESCOLLECTION": "Server=(localdb)\\mssqllocaldb;Database=GAMES_COLLECTION_DB;Trusted_Connection=True;"
  },
  "AllowedHosts": "*"
}

Up to that point the database worked and data was being saved after stopping the context but I was wondering where my database was created because in SSMS it didn't show up in my machine. I finally found that because of the connections string I was using another instance of sqlexpress and when I connected to the '(LocalDb)\\MSSQLLocalDB' engine in SSMS server name it was there.

So I now got an sql server database and a connection string to it so I can work in the mean while. My question then is, How is this configuration gonna work in real life? the connection string I wrote in appsettings.json is the place where the database is going to be created? so if I put a server ip it will be there?

Answer 1

Try the following...
In your appsettings.json ('String' not 'Strings'):

"ConnectionString": {
    "DBGAMESCOLLECTION": "..."
  }

In Startup.cs :

services.AddDbContext<ApplicationContext>(opts => opts.UseSqlServer(Configuration["ConnectionString:DBGAMESCOLLECTION"]));

And you have to add Code-First Migrations . Migrations automate the creation of database based on your Models. Something like:

PM> Add-Migration *Some_Description*

PM> update-database