That will be very difficult to do. ASP.NET uses a resource provider and that resource provider is used for all resource access through ASP.NET's resource access mechanism.
Basically you can only run one type of resource through the provider. What you could do is set your database provider as the ASP.NET provider and then use an explicit ResourceManager for the Resx resources but this will be horribly confusing.
What's going on that you need both? This seems like serious architecture problem...
+++ Rick ---