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Home > Programming > Application Development > Entity Framework Core Cookbook
Entity Framework Core Cookbook
Entity Framework Core Cookbook

Entity Framework Core Cookbook: Transactions, stored procedures, query libraries, and more , Second Edition

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Entity Framework Core Cookbook

Chapter 2. Mapping Entities

In this chapter, we will cover the following topics:

  • Mapping non-public members
  • Mapping interfaces
  • Shadow properties
  • Creating one-to-one maps
  • Creating one-to-many maps
  • Creating many-to-many maps
  • Creating custom conventions
  • Using sequence key generators
  • Using GUIDs as keys
  • Implementing inheritance–Table per class Hierarchy

Introduction

Object-relational mappers such as Entity Framework rely on mappings to translate Object-oriented concepts—classes, properties, references, inheritance – to the database world – composed of tables and columns – and vice versa. For example, a table normally translates to a .NET class, and its columns translate to the class properties.

Mapping entities and their properties is something that Entity Framework does automatically, and does generally well. There are some cases, however, in which we need to give it a hand. In this chapter, we will have a look at some special cases: it's going to be all about mappings.

Mapping non-public members

A well-encapsulated domain model does not contain just public members. The problem is that Entity Framework automatically maps public properties, but does not do so for non-public ones. In this recipe, we will see how we can map non-public properties of entities, so that Entity Framework recognizes them.

Getting ready

We will be using the NuGet Package Manager to install the Entity Framework Core 1 package, Microsoft.EntityFrameworkCore. We will also be using a SQL Server database to store the data, so we will also need Microsoft.EntityFrameworkCore.SqlServer.

Finally, xunit is the package we will be using for the unit tests, and dotnet-text-xunit adds tooling support for Visual Studio. Note that the UnitTests project is a .NET Core App 1.0 (netcoreapp1.0), that Microsoft.EntityFrameworkCore.Design is configured as a build dependency, and Microsoft.EntityFrameworkCore.Tools is set as a tool.

Open Using EF Core Solution from the included source code examples.

Execute...

Mapping interfaces

Other than mapping whole classes, it is also possible to define attributes of properties that are, for example, defined in interfaces. This kind of mapping could apply to several classes, all those that implement the given interface.

Getting ready

We will be using the NuGet Package Manager to install the Entity Framework Core 1 package, Microsoft.EntityFrameworkCore. We will also be using a SQL Server database to store the data, so we will also need Microsoft.EntityFrameworkCore.SqlServer.

Finally, xunit is the package we will be using for the unit tests, and dotnet-text-xunit adds tooling support for Visual Studio. Note that the UnitTests project is a .NET Core App 1.0 (netcoreapp1.0), that Microsoft.EntityFrameworkCore.Design is configured as a build dependency, and Microsoft.EntityFrameworkCore.Tools is set as a tool.

Open Using EF Core Solution from the included source code examples.

Execute the database setup script from the code samples included for this recipe. This...

Shadow properties

Going one step further from private properties, in a well-defined model, it may make sense to hide certain properties from the developers so that they do not make unwanted changes to them, consciously or not.

Historically, Entity Framework, like most ORMs, has three models:

  • POCO model: This represents the .NET classes and their properties and references
  • Database model: This represents the tables, views, and columns (in the case of relational data stores) where data is actually stored
  • Mapping model: This model binds the two preceding models; this is where we say that the MyEntity class is to be stored in the MY_ENTITY table and the Id property goes into the MY_ENTITY_ID column

Note

Entity Framework used to call these models Conceptual Model, Storage Model, and Mapping Model. If you are curious, refer to the following link:

https://msdn.microsoft.com/en-us/data/jj650889.

So, what we are looking for is a way to have a backing data store for entities and properties that does not...

Creating one-to-one maps

Entities can be related to each other in different ways. A one-to-one relation is one where each individual entity may be related to another, and this other one, if it exists, is directly related to the first. Examples include the following:

  • A relation from a person to their address, assuming that no two people share the same address
  • Additional details for an order
  • A person and their pet
  • A country and its head of state

A one-to-one relation is easy to represent in domain model terms: each of the entities has a reference to the other. Only one side can be made required; otherwise, we would have a problem: which one comes first? Let's see how we can map this kind of relation in Entity Framework Core.

Getting ready

We will be using the NuGet Package Manager to install the Entity Framework Core 1 package, Microsoft.EntityFrameworkCore. We will also be using a SQL Server database to store the data, so we will also need Microsoft.EntityFrameworkCore.SqlServer.

Finally, xunit...

Creating one-to-many maps

When an entity can be associated with one or more entities of another type, and each of these entities is associated with at most one entity of the first type, we call that one-to-many. It is one of the more basic kinds of relation, and, if looked at from the other endpoint, it becomes a many-to-one relation. Some examples of this include the following:

  • A blog and its posts
  • A parent and their children
  • A folder and its sub-folders
  • An order and its details (items included)

You may notice that there is one difference: in some of these relations, the many side cannot exist without the one—for example, a child without a parent–while in others, it can—there can be a folder without a parent folder.

This is easy to represent in the domain model; the one side holds a collection of entities of the many side, and the many side holds a reference to an entity on the one side. Pretty simple.

Getting ready

We will be using the NuGet Package Manager to install the...

Creating many-to-many maps

A many-to-many relation is another of those "canonical" ones. Essentially, each entity on one of the sides can be associated with many entities on the other side, and this goes the other way too. Just think of these use cases:

  • A post and its tags, where a tag can have multiple posts and a post multiple tags
  • Books and authors
  • Projects and developers

Usually, a many-to-many relation is easy to represent in classes: each side holds a collection of entities of the other side. In Entity Framework Core, however, things are not so simple. I'm sorry to break this to you, but as it happens, many-to-many relations are not supported! Do not be alarmed, though, there's still something we can do about it! This was a change from previous versions (Entity Framework 6.x) and one that will certainly be fixed. In the meantime, let's get it working.

Note

In Entity Framework Core, many-to-many relations are simulated with a middle entity. This even allows you to...

Introduction

Object-relational mappers such as Entity Framework rely on mappings to translate Object-oriented concepts—classes, properties, references, inheritance – to the database world – composed of tables and columns – and vice versa. For example, a table normally translates to a .NET class, and its columns translate to the class properties.

Mapping entities and their properties is something that Entity Framework does automatically, and does generally well. There are some cases, however, in which we need to give it a hand. In this chapter, we will have a look at some special cases: it's going to be all about mappings.

Mapping non-public members

A well-encapsulated domain model does not contain just public members. The problem is that Entity Framework automatically maps public properties, but does not do so for non-public ones. In this recipe, we will see how we can map non-public properties of entities, so that Entity Framework recognizes them.

Getting ready

We will be using the NuGet Package Manager to install the Entity Framework Core 1 package, Microsoft.EntityFrameworkCore. We will also be using a SQL Server database to store the data, so we will also need Microsoft.EntityFrameworkCore.SqlServer.

Finally, xunit is the package we will be using for the unit tests, and dotnet-text-xunit adds tooling support for Visual Studio. Note that the UnitTests project is a .NET Core App 1.0 (netcoreapp1.0), that Microsoft.EntityFrameworkCore.Design is configured as a build dependency, and Microsoft.EntityFrameworkCore.Tools is set as a tool.

Open Using EF Core Solution from the included source code examples.

Execute...

Mapping interfaces

Other than mapping whole classes, it is also possible to define attributes of properties that are, for example, defined in interfaces. This kind of mapping could apply to several classes, all those that implement the given interface.

Getting ready

We will be using the NuGet Package Manager to install the Entity Framework Core 1 package, Microsoft.EntityFrameworkCore. We will also be using a SQL Server database to store the data, so we will also need Microsoft.EntityFrameworkCore.SqlServer.

Finally, xunit is the package we will be using for the unit tests, and dotnet-text-xunit adds tooling support for Visual Studio. Note that the UnitTests project is a .NET Core App 1.0 (netcoreapp1.0), that Microsoft.EntityFrameworkCore.Design is configured as a build dependency, and Microsoft.EntityFrameworkCore.Tools is set as a tool.

Open Using EF Core Solution from the included source code examples.

Execute the database setup script from the code samples included for this recipe. This...

Shadow properties

Going one step further from private properties, in a well-defined model, it may make sense to hide certain properties from the developers so that they do not make unwanted changes to them, consciously or not.

Historically, Entity Framework, like most ORMs, has three models:

  • POCO model: This represents the .NET classes and their properties and references

  • Database model: This represents the tables, views, and columns (in the case of relational data stores) where data is actually stored

  • Mapping model: This model binds the two preceding models; this is where we say that the MyEntity class is to be stored in the MY_ENTITY table and the Id property goes into the MY_ENTITY_ID column

Note

Entity Framework used to call these models Conceptual Model, Storage Model, and Mapping Model. If you are curious, refer to the following link:

https://msdn.microsoft.com/en-us/data/jj650889.

So, what we are looking for is a way to have a backing data store for entities and properties that does not...

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Key benefits

  • Learn how to use the new features of Entity Framework Core 1
  • Improve your queries by leveraging some of the advanced features
  • Avoid common pitfalls
  • Make the best of your .NET APIs by integrating with Entity Framework

Description

Entity Framework is a highly recommended Object Relation Mapping tool used to build complex systems. In order to survive in this growing market, the knowledge of a framework that helps provide easy access to databases, that is, Entity Framework has become a necessity. This book will provide .NET developers with this knowledge and guide them through working efficiently with data using Entity Framework Core. You will start off by learning how to efficiently use Entity Framework in practical situations. You will gain a deep understanding of mapping properties and find out how to handle validation in Entity Framework. The book will then explain how to work with transactions and stored procedures along with improving Entity Framework using query libraries. Moving on, you will learn to improve complex query scenarios and implement transaction and concurrency control. You will then be taught to improve and develop Entity Framework in complex business scenarios. With the concluding chapter on performance and scalability, this book will get you ready to use Entity Framework proficiently.

Who is this book for?

This book is for .NET developers who work with relational databases on a daily basis and understand the basics of Entity Framework, but now want to use it in a more efficient manner. You are expected to have some prior knowledge of Entity Framework.

What you will learn

  • Master the technique of using sequence key generators
  • Validate groups of entities that are to be saved / updated
  • Improve MVC applications that cover applications developed using ASP.NET MVC Core 1
  • Retrieve database information (table, column names, and so on) for entities
  • Discover optimistic concurrency control and pessimistic concurrency control.
  • Implement Multilatency on the data side of things.
  • Enhance the performance and/or scalability of Entity Framework Core
  • Explore and overcome the pitfalls of Entity Framework Core
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Publication date : Nov 09, 2016
Length: 324 pages
Edition : 2nd
Language : English
ISBN-13 : 9781785883309
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Category :
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Length: 324 pages
Edition : 2nd
Language : English
ISBN-13 : 9781785883309
Vendor :
Microsoft
Category :
Programming
Concepts :
Application Development
Tools :
Entity Framework

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Table of Contents

9 Chapters
1. Improving Entity Framework in the Real World Chevron down icon Chevron up icon
1. Improving Entity Framework in the Real World
Introduction
Improving Entity Framework by using a code-first approach
Unit testing and mocking
Creating databases from code
Creating mock database connections
Implementing the repository pattern
Implementing the unit of work pattern
2. Mapping Entities Chevron down icon Chevron up icon
2. Mapping Entities
Introduction
Mapping non-public members
Mapping interfaces
Shadow properties
Creating one-to-one maps
Creating one-to-many maps
Creating many-to-many maps
Creating custom conventions
Using sequence key generators
Using GUIDs as keys
Implementing inheritance – Table per Class hierarchy
3. Validation and Changes Chevron down icon Chevron up icon
3. Validation and Changes
Introduction
Validating simple properties
Validating the whole entity
Validating groups of entities
Intercepting saving changes
Intercepting property changes
Setting the state of an entity
Improving MVC UI with entity framework validation
Inserting, updating, and deleting entities with stored procedures
Updating the database from model changes
Dumping the SQL script for the database creation
4. Transactions and Concurrency Control Chevron down icon Chevron up icon
4. Transactions and Concurrency Control
Introduction
Using explicit transactions
Using transactions in custom SQL operations
Implementing optimistic concurrency in SQL Server
Implementing optimistic concurrency in a database-agnostic way
5. Querying Chevron down icon Chevron up icon
5. Querying
Introduction
Executing client-side functions in LINQ queries
Mixing SQL with LINQ queries
Getting entities from the local cache
Creating filtered collections
Creating reusable queries
Querying shadow properties
Implementing the query object pattern
Using dynamic LINQ
6. Advanced Scenarios Chevron down icon Chevron up icon
6. Advanced Scenarios
Introduction
Generating entities from the database
Implementing multitenancy
Strongly typed bulk operations
Handling soft deletes
Adding logging
Capturing the audit data
Retrieving entity metadata
Improving MVC applications
Hooking infrastructure services
Using other databases
7. Performance and Scalability Chevron down icon Chevron up icon
7. Performance and Scalability
Introduction
Improving the performance of queries
Testing and profiling queries
Using asynchronous operations
Eager loading
Using the cache
A. Pitfalls Chevron down icon Chevron up icon
A. Pitfalls
Introduction
GroupBy executes on the client side
Table per class hierarchy requires nullable columns for derived classes
References not eagerly fetched are lost
Date/time operations are not supported
Paging in SQL Server earlier than 2012
Database null semantics
Migrations and contexts with parameterized constructors
Migrations with contexts in different projects
Accessing the service provider too soon
Setting the maximum string length
Mapping discriminator columns
Composite primary keys
Refreshing entities
Cascading entity deletes
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
(3 Ratings)
5 star 0%
4 star 0%
3 star 33.3%
2 star 33.3%
1 star 33.3%
Felix Aug 26, 2017
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
The book is OK, especially since it emphasizes what is not yet available in EF Core 1. Given the EF Core 2 just hit the market, I expect it to be significantly modified. But that's the fate of any book about fast-changing technology.The book is structured as a list of recipes - Getting Ready; How to do it; how it works; There's more; See also. As result, it looks more like a reference manual than a book. The explanation of what is *it* that is at the center of the recipe is very limited.Second, there is a lot of duplication: Getting Ready is pretty much the same - or at least the same in the chapter. The code without any explanation might as well be just downloaded from the site. And given that the title is EF *Core*, it's strange how many distracting references about how to do things in EF 6.
Amazon Verified review Amazon
Vlad Gâdescu Jul 17, 2017
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For me the book was hard to follow and not very clear. It has a lot of code examples that are also hard to follow and understand. After every code snippet the writer tries to explain it, but he does it in a very brief and superficial manner. If you want to learn about EF, do not buy this book.
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google007 Mar 27, 2017
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Even doesn't mention how to replace an old object with new one.
Amazon Verified review Amazon

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About the author

Profile icon Peres
Peres
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Ricardo Peres is a Portuguese developer, blogger, and book author and is currently a team leader at Dixons Carphone. He has over 20 years of experience in software development and his interests include distributed systems, architectures, design patterns, and .NET development. He won the Microsoft MVP award in 2015 and has held this title up to 2020. He also authored Entity Framework Core Cookbook – Second Edition and Mastering ASP.NET Core 2.0, and was a technical reviewer for Learning NHibernate 4 for Packt. He also contributed to Syncfusion's Succinctly collection, with titles on .NET development. Ricardo maintains a blog—Development With A Dot—where he writes about technical issues. You can catch up with him on Twitter at @rjperes75.
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Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela