EESTEC Summer School 2012 - Web Development class Entity Framework by Erni Durdevic

2. Sql data access (Classic style)
SQL String: «SELECT x, y FROM TblPoints»
Entity Framework

3. Sql data access with EF
 Entity Framework
takes care of the
DB interactions
and makes it
easy to access
relational data.
LINQ «SQL»
Entity
Framework

4. What is the Model?
Farm Model
Farm
Pig
s
Ducks
Rabbits

5. Database
Farm
Pig
s
Farm DB
Duck
s
Rabb
its

6. Entity Framework model
Our software
Farm
Pig
s
Duck
s
Farm Model Farm DB
Rabb
its

7. EF Model
 Database-First
Farm DB Farm Model
 Code-first
Farm Model Farm DB

8. EF –DB first
 DB First
 When you have a ready DB
and you want to access the
existing data
 If you better prefer to build
the database first, and
automatically create the
model

9. EF –DB first
 Demo:
› Create a DB
› Import it in into Visual Studio
› See what has been generated
 EDMX
 Mappings
 C#
 Class diagram

10. EF –Model first
 Model First
› When you are building a new
solution from scratch
(New approach)

11. EF –Model first
 Demo...
› Create the model
› Create an empty DB
› Generate the DB schema

12. EF –Model first
 Demo
› Reference the Entity solution in a
separate project
 Add reference
 Copy the connection string
 Reference System.Data.Entity
› Query data with LINQ
 Select
 Update
 Insert
 Delete