Entity Framework 4 "Code-First": Custom Database Schema Mapping
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by Scott Guthrie
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Quick Recap of our NerdDinner Sample

In my blog post last week I walked through building a simple “NerdDinner” application from scratch, and demonstrated the productivity gains EF “code first” delivers when working with data. 

Below are the two model classes we created to represent data within the application.  They are “plain old CLR objects” (aka “POCO”) that only expose standard .NET data types:


We then created a “NerdDinners” class to help map these classes to/from a database.  “NerdDinners” derives from the DbContext class provided by the EF “code first” library and exposes two public properties:


We used the default EF4 “code first” conventions to enable database persistence.  This means that the “Dinners” and “RSVPs” properties on our “NerdDinners” class map to tables with the same names within our database.  Each property on our “Dinner” and “RSVP” model classes in turn map to columns within the “Dinners” and “RSVPs” tables.

Below is the database schema definition for the “Dinners” table within our database:


Below is the database schema definition for the “RSVPs” table within our database:


We did not have to configure anything in order to get this database persistence mapping with EF4 “code first” – this occurs by default simply by writing the above three classes.  No extra configuration is required.

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