Sql data access (Classic style)

SQL String: «SELECT x, y FROM TblPoints»

Entity Framework

Entity

Framework

«SQL»LINQ

Entity Framework

takes care of the

DB interactions

and makes it

easy to access

relational data.

Sql data access with EF

Farm

Pig

s

Ducks

Rabbits

Farm Model

What is the Model?

Farm

Pig

s

Duck

s

Rabb

its

Farm DB

Database

Farm

Pig

s

Duck

s

Rabb

its

Farm DBFarm Model

Our software

Entity Framework model

Farm DBFarm Model

Farm DB Farm Model

EF Model

Database-First

Code-first

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

EF –DB first Demo:

› Create a DB

› Import it in into Visual Studio

› See what has been generated

EDMX

Mappings

C#

Class diagram

EF –Model first

Model First

› When you are building a new

solution from scratch

(New approach)

EF –Model first

Demo...

› Create the model

› Create an empty DB

› Generate the DB schema

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

EF –Model first