This document details the steps required to provide Microsoft Entity Framework access to Microsoft SQL Server Schema Objects using the
The following prerequisites must be in place for this solution to be possible.
A Microsoft SQL Server DBMS hosting the required Schema Objects needs to be available. In this document the Microsoft SQL Server Northwind sample database will be used to demonstrate the process.
A Microsoft SQL Server ODBC Driver is required for Linking the Microsoft SQL Server Schema Objects into the Virtuoso Server.
sql2k5ma" will be assumed to exist on the machine hosting the Virtuoso Server.
An Virtuoso installation including the Virtuoso Universal Server and ADO.NET Entity Framework Provider is required. The Virtuoso components used must be Release 5.10.x or above, this being the minimum version containing support for Microsoft Entity Frameworks.
Microsoft Visual Studio 2008 Service Pack 1 is required, this being the only version containing the necessary Entity Framework support available at the time of writing.
The Visual Studio 2008 Entity Data Model (EDM) requires that all primary keys are *NOT* Nullable, and will fail to generate an EDM if any are. Thus ensure any tables to be used are defined as not nullable in the Microsoft SQL Server database schema before attempting to generate an EDM. In the case of the Microsoft SQL Server Human Resources database all tables are not nullable, thus this should not be an issue in this case.
The Virtuoso Virtual Database engine uses ODBC as the connectivity mechanism for linking remote database objects into its local schema.
Thus a Microsoft SQL Server ODBC Driver must be available with a suitably configured DSN for connecting to the target database.
Installation instructions for the
Now that a Microsoft Entity Data Model has been created for the Microsoft SQL Server Northwind database, Entity Framework applications can be created to make use of it.