EntityFramework Core Database.EnsureCreated不会创建数据库

Question

I create a project with dotnetcore and entity framework core. I use MySql database and I added dependency to SapientGuardian.EntityFrameworkCore.MySql version 7.1.19 .

I created a SeedData class where initialize my database:

public class SeedData
{
    public static void Initialize(IServiceProvider serviceProvider)
    {
        using (MyDbContext context = new MyDbContext(serviceProvider.GetRequiredService<DbContextOptions<MyDbContext>>())) {
            context.Database.EnsureCreated();
        }
    }
}

The call to seed class:

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    // Other code

    SeedData.Initialize(app.ApplicationServices);
}

And the configuration of service:

public void ConfigureServices(IServiceCollection services)
{
    // Other code

    // Add database
    services.AddDbContext<MyDbContext>(options => {
            options.UseMySQL(Configuration.GetConnectionString("DefaultConnection"));
    });

    services.AddScoped<Microsoft.EntityFrameworkCore.Infrastructure.IDbContextOptions, Microsoft.EntityFrameworkCore.DbContextOptions<MyDbContext>>();
}

When I start the project I get an exception on EnsureCreate call. Exception message say Authentication failed but if I manually create database (without tables) my connection string works fine and EnsureCreated simply create tables for my entities.

What's wrong? It's a problem with SapientGuardian.EntityFrameworkCore.MySql ?

Answer 1

I had the same problem you described. It looks like the SapientGuardian provider might simply have an incomplete implementation in this version.

The SapientGuardian project's readme file actually suggests using a more actively maintained provider such as Pomelo.EntityFrameworkCore.MySql . So I switched my project to Pomelo. Now the call to EnsureCreated creates the database as expected and does not have an authentication failed exception.