Entity Framework Overview

Entity Framework
Eyal Vardi
CEO E4D Solutions LTDMicrosoft MVP Visual C#blog: www.eVardi.com

Agenda
Data Access History
OO vs. Relational World
EF Architecture
Development Approaches
EF 4.0+ New API
EDM
LINQ to Entities
Entity SQL
Conceptual Model
Object Services
Mapping
Entity Client Provider
StorageModel
ADO.NET Provider

Data Access History

Services:- Change tracking- Concurrency control- Object identity
SQL or Stored Procs
Rows
SQLServer
Entity Framework
Entity Framework Flow
Application
from c in db.Customerswhere c.City == "London"select new { c.Name, c.Phone }
Objects
LINQ Query
SubmitChanges()
EDMX
ADO.NET Provider
SQL Query
select Name, Phonefrom customerswhere city = 'London'

OO vs. Relational World
Data Types
Associations
Granularity
Inheritance
Identity

EF Architecture
SQLServer
EDM
LINQ to Entities
Entity SQL
Conceptual Model
Object Services
Mapping
StorageModel
ADO.NET Provider

Entity Data Model (EDM)
The EDM is the link between the model and the database.
The EDM is that it decouples your application from the underlying store.
Entity Data Model (EDM)
StorageModel
(SSDL)
Mapping
(MSL)
Conceptual Model (CSDL)
Storage

Object Services
Materialization
The process of transforming the data obtained from the Entity Client data provider, which has a tabular structure, into objects.
Change tracking
Tracks any changes made to the objects.
Query transformation
Translates queries it into a command tree that’s then passed on to the underlying Entity Client.
Object identities

Object Services Functions
Querying
Querying data as objects
Shaping query results
Composing queries
CRUD
Lazy loading
Inheritance
Navigating relationship
Change tracking
Saving changes
Attaching objects
Detaching objects
Serializing objects
Managing
Object identities
Concurrency
Transactions

Entity SQL & LINQ to Entities
LINQ to Entities - The LINQ dialect that enables typed queries against the model.
Entity SQL - The second way of querying the object model.
Entity SQL is string-based.
Can be used to retrieve data at low level, directly using the Entity Client.

EDM
LINQ to Entities
Entity SQL
Conceptual Model
Development Approaches
Object Services
Mapping
StorageModel
ADO.NET Provider

Database First
DB
If you already have a database, the Entity Framework can automatically generate a data model that consists of classes and properties that correspond to existing database objects such as tables and columns.
Generated
Data Model
(.edmx)
Database First

Model First
Generated
DB
If you don't yet have a database, you can begin by creating a model using the Entity Framework designer in Visual Studio.
The designer can generate DDL (data definition language) statements to create the database.
Data Model
(.edmx)
Model First

DB
Generated
Data Model
(Classes)
Code First
Code First
Generated
DB
Whether you have an existing database or not, you can code your own classes and properties that correspond to tables and columns and use them with the Entity Framework without an .edmx file.
Data Model
(Classes)
Code First

Why DbContext & DbSet?
This API provides a more productive surface for working with the EF and can be used with the Code First, Database First, and Model First approaches.
Model Discovery
Model Caching
DbSet Initialization
Database Provisioning
DbModelConstructor
ObjectContextConstructor
* More info click here

EF 4.1 New API

Features That Are Not Supported
features are not supported by the DbContextAPI. To use these features, use the ObjectContextAPI.
Compiled queries
MEST (Multiple Entity Sets per Type)
Self-tracking entities.
To use the DbContext API in an N-tier application, consider using WCF Data Services or RIA Services.

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Entity Framework Overview

by Eyal Vardi on Oct 14, 2011

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Entity Framework Overview — Presentation Transcript