Entity Framework MIS 324 MIS 324 Professor Sandvig Professor Sandvig

Outline  What is Entity Framework  Benefits  Drawbacks  Example

What is Entity Framework  Microsoft’s newest data access technology  Visual Studio: Examines database Examines database Creates objects that represent data schema Creates objects that represent data schema  LINQ (Language Integrated Query) Replaces SQL Replaces SQL Select, sort, filter, etc. Select, sort, filter, etc.

Benefits  Eliminates disconnect between code & database No sql statements in code No sql statements in code  Use intellisense to write query  LINQ works on all data collections Arrays, lists, dataviews, etc. Arrays, lists, dataviews, etc.

Drawbacks  Microsoft propriety technology  LINQ query syntax different than SQL Better in many ways Better in many ways  Synchronization between database and entity objects Change database Change database Rebuild entity objects Rebuild entity objects

Creating Model

Note: Relationships should be defined in database

Linq

Output  Music Store Example Example