Is it possible to have a EF Context for MySql and SqlServer?

Question

I have two entity framework contexts, one for MySql and one for sql. If I run the app I get the following error

The default DbConfiguration instance was used by          


        

Answer 1

My Uow.cs had 2 different contexts as variables. As a result during object initialization the first context's DbConfiguration was silently applied even when I was interested only in the second context. As a result the second context have responded with the same error until I have changed the design.

update

More details - I have updated the code to use the same Context for Oracle and MS SQL versions. To provide correspondent db configuration I have added custom config class in the same assembly with the context and use it with DbConfigurationType attribute. In your case it could be something like this:

public class CustomDbConfiguration : DbConfiguration
{
    public CustomDbConfiguration()
    {
        if (DbChecker.MySqlInUse)
            SetConfiguration(new MySqlEFConfiguration());
    }
}

and both contexts are trying to apply it

[DbConfigurationType(typeof(CustomDbConfiguration))]
public class ZipCodeContext : DbContext
{
    public DbSet<ZipCode> ZipCodes { get; set; }
}

[DbConfigurationType(typeof(CustomDbConfiguration))]
public class MyContext : DbContext
{
    public DbSet<MyClass> MyClasses { get; set; }
}

Answer 2

FYIW - I had the same problem. The only thing that resolved the issue was to add the following code at the beginning of my program's execution.

var needsToBeInstantiated = new EFDBContextConfiguration();
EFDBContextConfiguration.SetConfiguration( needsToBeInstantiated );