Using an .edmx File

An .edmx file is an XML file that defines an Entity Data Model (EDM), describes the target database schema, and defines the mapping between the EDM and the database. An .edmx file also contains information that is used by the ADO.NET Entity Data Model Designer (Entity Designer) to render a model graphically.

This appendix explains the necessary changes to the .edmx file in order to provide Extended Entity Framework functionality to the EDM layer.

The Entity Framework includes a set of methods similar to those of ADO.NET. These methods have been tailored to be useful for the new Entity Framework consumers – LINQ, EntitySQL, and ObjectServices.

The ADO.NET Entity Framework data provider models this functionality in the EDM by surfacing the PsqlStatus and PsqlConnectionStatistics entities. This allows you to quickly model this functionality using the standard tools in Visual Studio.