var securityConnectionString = ConfigurationManager.Instance.GetRequiredSection("ConnectionStrings")["Security"];
var serverVersion = ServerVersion.AutoDetect(securityConnectionString);

services.AddDbContextPool<Security.ApplicationLayer.Context.AccessTokenContext>(options =>
    options.UseMySql(securityConnectionString, serverVersion)
);

services.AddDbContextPool<Security.ApplicationLayer.Context.UserContext>(options =>
     options.UseMySql(securityConnectionString, serverVersion)
);

services.AddDbContextPool<Security.ApplicationLayer.Context.UserGroupContext>(options =>
     options.UseMySql(securityConnectionString, serverVersion)
);

services.AddDbContextPool<Security.ApplicationLayer.Context.PermissionContext>(options =>
     options.UseMySql(securityConnectionString, serverVersion)
);

services.AddDbContextPool<Security.ApplicationLayer.Context.RoleContext>(options =>
     options.UseMySql(securityConnectionString, serverVersion)
);

var serviceProvider = services.BuildServiceProvider();
var userContext = serviceProvider.GetService<Security.ApplicationLayer.Context.UserContext>();

var accessTokenContext = serviceProvider.GetService<Security.ApplicationLayer.Context.AccessTokenContext>();
var userGroupContext = serviceProvider.GetService<Security.ApplicationLayer.Context.UserGroupContext>();
var permissionContext = serviceProvider.GetService<Security.ApplicationLayer.Context.PermissionContext>();
var roleContext = serviceProvider.GetService<Security.ApplicationLayer.Context.RoleContext>();

accessTokenContext.Database.EnsureCreated();
userContext.Database.EnsureCreated();
userGroupContext.Database.EnsureCreated();
permissionContext.Database.EnsureCreated();
roleContext.Database.EnsureCreated();

public class UserContext : DbContext
{
    public DbSet<User> User { get; set; }
    public DbSet<UserCredential> UserCredential { get; set; }

    public UserContext(DbContextOptions<UserContext> options) : base(options)
    {
        Database.EnsureCreated();
    }
}

public class AccessTokenContext : DbContext
{
    public DbSet<AccessToken> AccessToken { get; set; }

    public AccessTokenContext(DbContextOptions<AccessTokenContext> options) : base(options)
    {
        Database.EnsureCreated();
    }
}

public class UserGroupContext : DbContext
{
    public DbSet<UserGroup> UserGroup { get; set; }
    public DbSet<UserInUserGroup> UserInUserGroup { get; set; }
    public DbSet<RoleInUserGroup> RoleInUserGroup { get; set; }

    public UserGroupContext(DbContextOptions<UserGroupContext> options) : base(options)
    {
        Database.EnsureCreated();
    }
}

public class PermissionContext : DbContext
{
    public DbSet<Permission> Permission { get; set; }

    public PermissionContext(DbContextOptions<PermissionContext> options) : base(options)
    {
        Database.EnsureCreated();
    }
}

public class RoleContext : DbContext
{
    public DbSet<Role> Role { get; set; }
    public DbSet<PermissionInRole> PermissionInRole { get; set; }

    public RoleContext(DbContextOptions<RoleContext> options) : base(options)
    {
        Database.EnsureCreated();
    }
}