The document provides an overview of Entity Framework Core (EF Core), a lightweight and cross-platform object-relational mapper for .NET developers that simplifies database interactions. It discusses EF Core's database support, features, limitations, and how to query and save data, highlighting its advantages over previous versions. Additionally, it includes references for further learning and technical documentation.

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Entity Framework Core (EF Core)
Marko Šarić
marko.saric@comminus.hr

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Content
• What is EF CORE
• EF Core Database Support
• Entity Framework Core vs Entity Framework 6.x
• The Model (Database Context)
• Querying data
• Saving data
• Stored procedures
09.12.2016.

3. How to use?
.NET Core has reached the 1.1 release. It's cross-platform, open source, and
wicked fast. Plus you can code on your Mac.
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09.12.2016.

4. What is EF Core
• Object-relational mapper (O/RM) that enables .NET developers to work with a
database using .NET objects. It eliminates the need for most of the data-access
code that developers usually need to write.
• Lightweight, extensible, and cross-platform version of Entity Framework.
• Built over a completely new set of core components. EF Core doesn't
automatically inherit all the features from EF6.x.
• Some of these features will show up in future releases (such as lazy loading and connection
resiliency)
• Less commonly used features will not be implemented in EF Core.
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09.12.2016.

5. • Microsoft SQL Server (including SQL Azure)
• Also support for SQL Server Compact Edition
• Memory-Optimized Table support was introduced in EF Core 1.1.0.
• SQLite
• PostgreSQL
• MySQL
• Built-in in-memory database (designed for testing purposes only)
• The Oracle .NET team is evaluating EF Core support, but have not announced
any timing
• Database providers are installed through NuGet
• PM> Install-Package Microsoft.EntityFrameworkCore.SqlServer
• PM> Install-Package Npgsql.EntityFrameworkCore.PostgreSQL
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09.12.2016.

6. Features not in EF Core
• Spatial data types such as SQL Server's geography & geometry
• Graphical visualisation of model
• Loading related data: Lazy
• Stored procedure mapping (stored procedures are supported)
Copyright Comminus d.o.o.
09.12.2016.

7. The Model
A model is made up of entity classes and a derived context that represents a
session with the database, allowing you to query and save data.

8. Querying
Instances of your entity classes are retrieved from the database using Language
Integrated Query (LINQ)

9. Querying
• Loading Related Data
• Eager loading: related data is loaded from the database as part of the initial
query
• Explicit loading: related data is explicitly loaded from the database at a later
time

10. Saving data
Data is created, deleted, and modified in the database using instances of your
entity classes

12. Stored Procedures
• Use FromSql method which executes RAW SQL queries.
Limitations (and misconceptions):
• SQL queries can only be used to return entity types that are part of your model. Therefore, it cannot contain
related data
• The SQL query must return data for all the properties of the entity. So basically your SQL query should be
Select * from {tableName}
• The column names in the result set must match the column names that properties are mapped to
• For INSERT, UPDATE, DELETE queries: ExecuteSqlCommand.
• It returns integer value which indicates the count of affected rows
• ExecuteSqlCommand should be used on context.Database
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09.12.2016.

14. References
Official Technical Documentation
 https://docs.microsoft.com/en-us/ef/
101 LINQ Samples
 https://code.msdn.microsoft.com/101-LINQ-Samples-3fb9811b
EF Core 1.0: First Look
 https://app.pluralsight.com/library/courses/play-by-play-ef-core-1-0-first-look-julie-lerman
LINQ Fundamentals with C# 6.0
 https://app.pluralsight.com/library/courses/linq-fundamentals-csharp-6
Building a Web App with ASP.NET Core, MVC 6, EF Core, and Angular
 https://app.pluralsight.com/library/courses/aspdotnetcore-efcore-bootstrap-angular-web-app
/
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