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Entity Framework Tutorial (Update)

Entity Framework Tutorial (Update) - Second Edition

By : Joydip Kanjilal
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Entity Framework Tutorial (Update)

Entity Framework Tutorial (Update)

2 (4)
By: Joydip Kanjilal

Overview of this book

The ADO.NET Entity Framework from Microsoft is a new ADO.NET development framework that provides a level of abstraction for data access strategies and solves the impedance mismatch issues that exist between different data models This book explores Microsoft’s Entity Framework and explains how it can used to build enterprise level applications. It will also teach you how you can work with RESTful Services and Google’s Protocol Buffers with Entity Framework and WCF. You will explore how to use Entity Framework with ASP.NET Web API and also how to consume the data exposed by Entity Framework from client applications of varying types, i.e., ASP.NET MVC, WPF and Silverlight. You will familiarize yourself with the new features and improvements introduced in Entity Framework including enhanced POCO support, template-based code generation, tooling consolidation and connection resiliency. By the end of the book, you will be able to successfully extend the new functionalities of Entity framework into your project.
Table of Contents (11 chapters)
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10
Index

Why E-SQL when I already have LINQ to Entities?


LINQ to Entities is a new version of LINQ, well suited for Entity Framework. But why do you need E-SQL when you already have LINQ to Entities available to you? LINQ to Entities queries are verified at the time of compilation. Therefore, it is not at all suited for building and executing dynamic queries. On the contrary, E-SQL queries are verified at runtime, so they can be used for building and executing dynamic queries.

You now have a new ADO.NET provider in E-SQL, which is a sophisticated query engine that can be used to query your data from the conceptual model. It should be noted, however, that both LINQ and E-SQL queries are converted into canonical command trees that are in turn translated into database-specific query statements based on the underlying database provider in use, as shown in the following diagram:

We will now take a quick look at the features of E-SQL before we delve deep into this language.

Features of E-SQL

These are the...

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