Entity framework core 2.0 books free download

You can download Dependency Injection in. Register now to access thousands of books available for free signup download. One again, the subscription was free. Post a Comment. See our. NET implementation. Queries are more efficient in EF Core 2. As an example, we increased the number of patterns that can be translated to SQL, so many queries that triggered client-side evaluation in previous versions will no longer do it in 2. You can now use EF. In combination with table splitting, owned types allow these two entities to be automatically mapped to a single Customer table:.

You can now specify filters in the model that are applied automatically to all entities of a type in all queries executed on the DbContext. Many ASP. NET Core applications can now obtain a performance boost by configuring the service registration of their DbContext types to use a pool of pre-created instances, avoiding the cost of creating new instance for every request:. This will create a parameter p0 with a value of 'Redmond' and SQL that looks like this:.

We have added a few more features such as explicitly compiled queries , self-contained entity configurations in code first and database scalar function mapping thanks to Paul Middleton for a great contribution! Please check the overview of the new features in our documentation. We would like to take the chance to reiterate our gratitude to everyone contributing to our project, in particular, to external contributors who made code submissions to EF Core in 2.

Comments are closed. NET Meetup Events. Web apps with ASP. NET Core. Mobile apps with Xamarin. This updated edition also contains new material on NoSQL databases. NET developers familiar with relational databases. About the author Jon P. Smith is a freelance software developer and architect with a special focus on. NET and Azure. NET Core 2. Even though Entity Framework 2.

NET team to develop all the existing features of Entity Framework 6. NET Framework. The editors came in different flavors, supporting both platform-specific and cross-platform IDEs:.

The Visual Studio installer is segregated into workloads, individual components, and language packs. NET and web development and. NET Core cross-platform development. The workload is a combination of one or more individual components which can also be installed from the Individual components tab of the installer, as follows:. It is up to the reader to pick an edition which suits their needs the tools and scaffolding available in the IDE might differ. Open Visual Studio and create a new project either from the File menu or from the Start page.

From the New Project section, create a new project using any one of the following approaches :. From the File menu, perform the following steps:. Irrespective of the previous two approaches, the selected template will provide New ASP.

NET Web Application. NET Core dialog, to let us choose from the following:. The generated web application displays a tabbed interface which is new to us instead of displaying index. It allows us to access documentation, connect to any service or even decide on publishing options right from the start page. If we look closely, we will notice that Visual Studio was silently restoring the packages, and almost everything was part of a package in.

NET Core. No more heavyweight framework which always loads tons of DLLs even though we don't require them! Now everything is broken into lighter packages which we could utilize based on our requirements.

I know getting into MVC would be a little outside of the scope of this chapter, but let's dig into a few details before we deep dive into the Entity Framework. We have created a. NET Core web application with no authentication and explored the structure of the project, which might help us understand MVC in. If we expand the dependencies, it is evident that we don't have built-in support for Entity Framework EF Core.

We will look at the different ways of identifying and installing the packages. The Entity Framework package should be installed as part of the NuGet package, and can be done in the following ways:. The Package Manager Console will be opened as shown in the following screenshot, Kindly use this space to install the package using the preceding command:. We have looked at different ways of using the Package Manager console so far, and installed packages related to EF Core.

In the next section, we will start building the schema and later consume the created entities using EF. When we think about creating data models in the. NET world way before creating the database, we are a little bit off the legacy track, and yes, it's been widely called the Code-First approach.

Let's create entity classes using code-first for the Blogging application, and put them into the Models folder under the project. Create a Blog. The Entity Framework will look for any property with the name Id or TypeNameId and marks them as the primary key of the table.

The Posts property is a navigation property which contains Post items related to this Blog entity. Create a Post. The BlogId property is a foreign key created for the corresponding Blog navigation property.

As you may notice in this case, we have an individual item as the navigation property, as opposed to a list in the Blog entity. This is where relationship type comes into the picture, which we will be exploring more in Chapter 3 , Relationships — Terminology and Conventions. EF will allow us to create an individual navigation property without any foreign key in the entity.

In those cases, EF will create a foreign key for us in the database table using the BlogId pattern the Blog navigation property along with its Id primary key. EF will generate them automatically for all navigational properties against the Id primary key, but it also allows us to name it differently and decorate it via a custom attribute. The main entry point for EF would be any class that inherits the Microsoft.

DbContext class. Let's create a class called BlogContext and inherit the same. We will keep the context and other EF related configurations inside the Data folder. Create a Data folder in the project, and also create BlogContext. We usually name the properties in plural form as the property will hold list of entities, and EF will be using those property names while creating tables in the database.

Creating a DbSet for a parent entity is enough for EF to identify the dependent entities and create corresponding tables for us. EF will be using plural form while deciding table names.

NET developers and SQL developers debate plural table names and often end up creating entities with two different conventions. As a framework, EF supports those scenarios as well.