EF Core: how do I configure mySql for Linux, and localDB for Windows?

Question

I have a simple ASP.Net Core/Entity Framework Core project that uses LocalDB. It compiles and runs fine on Windows.

I would like to build and run the same project on Windows and Linux. But LocalDB isn't supported on Linux. So I need to configure the project to use mySql instead - but only for Linux.

Q: How do I configure my project so that I can use LocalDB on Windows, but mySql on Linux?

This is what I've tried so far:

1. Created an empty mySql database and granted access to a mySql user.

2. Created a mySql connection string in appsettings.json :

    { "ConnectionStrings": { "DefaultConnection": "Server=(LocalDb)\\\\MSSQLLocalDB;Database=ManageCarDB;Trusted_Connection=True;MultipleActiveResultSets=true", "mySqlConnection": "Server=localhost;port=3306;database=ManageCarDb;uid=dotnetuser;password=dotnetuser" },... <= I've defined two different connection strings: one for LocalDB, one for MySql 

3. Updated Startup.cs :

    public void ConfigureServices(IServiceCollection services) { string env = System.Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT"); string connectionString; if (!string.IsNullOrEmpty(env) && env.Equals("Linux")) { connectionString = Configuration.GetConnectionString("mySqlConnection"); services.AddDbContext<ApplicationDbContext>(options => options.UseMySQL(connectionString)); } else { connectionString = Configuration.GetConnectionString("DefaultConnection"); services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(connectionString)); } 

   <= Startup will conditionally call either MySql connection string/MySQL data provider, or default/LocalDB

4. On Linux:

   1. deleted all binaries
   2. dotnet restore
   3. dotnet ef migrations add newMigration -c ApplicationDbContext -v

   <= This all worked OK

5. Tried to update the database:

   dotnet ef database update

   <= ERROR: Table 'ManageCarDb.__EFMigrationsHistory' doesn't exist

Q: Given that I'd like one project for both EF environments, am I taking the correct steps?

Or should I taking a different approach?

Answer 1

You should use `Pomelo.EntityFrameworkCore.MySql instead of MySql library from Oracle.

I use Pomelo.EntityFrameworkCore.MySql and it works well in my project.

MySql library from Oracle is not supporting migration as I did try. This library is facing several issues

Note : I am finding a link that talks about this problem for Oracle's site

Error: The method or operation is not implemented. while scaffolding MYSQL Database

https://bugs.mysql.com/bug.php?id=90368