Book Image

Mastering Entity Framework Core 2.0

By : Prabhakaran Anbazhagan
Book Image

Mastering Entity Framework Core 2.0

By: Prabhakaran Anbazhagan

Overview of this book

Being able to create and maintain data-oriented applications has become crucial in modern programming. This is why Microsoft came up with Entity Framework so architects can optimize storage requirements while also writing efficient and maintainable application code. This book is a comprehensive guide that will show how to utilize the power of the Entity Framework to build efficient .NET Core applications. It not only teaches all the fundamentals of Entity Framework Core but also demonstrates how to use it practically so you can implement it in your software development. The book is divided into three modules. The first module focuses on building entities and relationships. Here you will also learn about different mapping techniques, which will help you choose the one best suited to your application design. Once you have understood the fundamentals of the Entity Framework, you will move on to learn about validation and querying in the second module. It will also teach you how to execute raw SQL queries and extend the Entity Framework to leverage Query Objects using the Query Object Pattern. The final module of the book focuses on performance optimization and managing the security of your application. You will learn to implement failsafe mechanisms using concurrency tokens. The book also explores row-level security and multitenant databases in detail. By the end of the book, you will be proficient in implementing Entity Framework on your .NET Core applications.
Table of Contents (20 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Dedication
Preface
4
Building Relationships – Understanding Mapping

Composing with LINQ


We have performed flat SQL queries so far. This doesn't involve LINQ queries. If we had a mechanism that could leverage flat queries composed of LINQ to SQL queries, then we could get the best of both worlds. Fortunately, we do have built-in support in Entity Framework, and the flat SQL queries could be composed of LINQ queries, and we will cover them in detail in this section.

Let's comment the current implementation in LatestBlogs() and perform the SP implementation using flat queries composed with LINQ. Ideally, what we are trying to achieve is to get the table data using a LINQ query and compose the result with a LINQ query to perform filtering and ordering from a LINQ query (this might not be a real-world scenario, but it works well for illustration):

    public async Task<IActionResult> LatestBlogs()
    {
      //return View("Index", await _context.Blogs.FromSql("EXEC [dbo].
         [GetLatestBlogs]").ToListAsync());
      var comparisonDateTime = DateTime...