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

Understanding relationship terms


We have created and used data models or entities so far, but we haven't figured out how they are related. Let's understand how they are related and the terminologies used for those relationships.

Data models

We will revisit the data models we created and consumed in Chapter 1, Kickstart - Introduction to Entity Framework Core (using the Code-First approach), which could be used to understand the relationship terminologies. For illustration purposes, we will tweak those objects to understand different terminologies that were not used in the system.

Blog entity

The Blog entity/data model we created using the Code First approach is displayed as follows:

    public class Blog
    {
      public int Id { get; set; }
      public string Url { get; set; }
      public ICollection<Post> Posts { get; set; }    
    }

We will be using the Blog model to understand the following:

  • Principal entity
  • Principal key
  • Navigational property

The Post entity

The Post entity/data model...