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

Chapter 5. Working with Entity Client and Entity SQL

The ADO.NET Entity Framework contains a powerful client-side query engine that allows you to execute queries against the conceptual model of data, irrespective of the underlying data store in use. This query engine works with a rich functional language called Entity SQL (or E-SQL for short), a derivative of T-SQL, that enables you to query entities or collection of entities.

In this chapter, we will take a look at both Entity Client and Entity SQL, and learn how to use them in our applications.

We will discuss the following areas:

  • An overview of the Entity SQL Language

  • Differences between Entity SQL and Transact SQL

  • When to choose Entity SQL over LINQ

  • Working with the Entity Client

  • Transaction Management in the Entity Framework

Before we get started with Entity Client, we should have a proper understanding of Entity SQL. This is, the T-SQL like query language used by the Entity Client provider. We will start this chapter with a discussion on the...