Book Image

Entity Framework Tutorial

By : Joydip Kanjilal
Book Image

Entity Framework Tutorial

By: Joydip Kanjilal

Overview of this book

<p>The ADO.NET Entity Framework is a new way to build the data access layer of your Windows or web applications. It's an Object Relational Mapping (ORM) technology that makes it easy to tie together the data in your database with the objects in your applications, by abstracting the object model of an application from its relational or logical model.<br /><br />This clear and concise book gets you started with the Entity Framework and carefully gives you the skills to speed up your application development by constructing a better data access layer. It shows you how to get the most from the ADO.NET Entity Framework to perform CRUD operations with complex data in your applications.<br /><br />This tutorial starts out with the basics of the Entity Framework, showing plenty of examples to get you started using it in your own code. You will learn how to create an Entity Data Model, and then take this further with Entity types. You will also learn about the Entity Client data provider, learn how to create statements in Entity SQL, and get to grips with ADO.NET Data Services, also known as Project Astoria.</p>
Table of Contents (13 chapters)
Entity Framework Tutorial
Credits
About the Author
About the Reviewer
Preface

Introducing ADO.NET Data Services


Primarily designed in order to separate the presentation layer and data in a REST-based model, ADO.NET Data Services are used to expose data as a service so they can be accessed via HTTP requests. You can use the standard HTTP verbs MERGE, GET, POST, PUT, and DELETE and perform CRUD (Create, Read, Update and Delete) operations against the service. ADO.NET Data Services expose the database schema in terms of XML metadata. It uses Atom and JSON data formats for data transfer over the HTTP protocol.

ADO.NET Data Services isolate the Data Access Layer and expose data via WCF services. We do not need to have the presentation layer as a consumer of a Data Services. We could also have another service as in SOA scenarios.

You can use ADO.NET Data Services to expose data through web services in terms of EDM abstractions such as Entity Data Model (EDM) objects. These objects can then be accessed by any application in much the same way as a web service is accessed....