The name that you are giving it should not be given earlier. The HasIndex method creates an index on one or more columns of an entity to improve query performance. The HasAlternateKey method is used to specify an alternate key for an entity.
The EF 6.x is a stable and fully tested ORM technology in many .NET Framework applications. The application targets .NET Core, e.g., ASP.NET Core Applications. Entity Framework Core is the new and improved version of the Entity Framework for .NET Core applications. EF Core continues to support the same features and concepts as EF 6. The EF Core database provider usually contains the functionality specific to the database it supports.
What is Entity Framework?
EF Core offers new features that won’t be implemented in EF6. However, not all EF6 features are currently implemented in EF Core. Please check the following link for more detailed information. An ORM Framework like Entity Framework or EF Core can do all of the above for us and saves a lot of time if we provide the required information to the ORM Framework.
Entity Framework Core can be used with .NET core or .NET 4.6 based applications. Here we will learn how to install and use the Entity Framework core 2.0 in .NET Core applications using visual studio 2017. Now, if you verify the database, you should see the following. Here, you can see the StudentInfo advantages of entity framework table is created with the default dbo schema, and the StandardInfo table is created with the Admin schema. TPT looks ideal from the object-oriented perspective as every entity is mapped to its own table. But when querying the data, EF Core will create joins between those tables.
Even though the DbSet property names are Students and Standards, the Entity Framework Core will generate tables with the names StudentInfo and StandardInfo in the database. The point that you need to remember is that modelBuilder.Entity() returns the EntityTypeConfiguration object, using which we can configure many things. This late-bound or «weakly-typed» approach to data access is prone to error. Consequently, professional developers prefer to work with data in a strongly-typed manner. In the Code-First Approach, the EF Core creates the database and tables using Code-First Migration based on the default conventions and configuration.
EF Core Database Providers
Let us understand why we need to use the ORM Framework with an example. Suppose we want to develop an application to manage the students of a college. To do this, we may need to create classes such as Student, Department, Address, etc.
This will allow us to execute the Entity Framework Core commands for scaffolding, migration, etc. from the Package Manager Console (PMC) within the Visual Studio. Here we will also see that provider NuGet package also installed another package such as Microsoft.EntityFrameworkCore.Relational and System.Data.SqlClient. We implement the Configure() method from the IEntityTypeConfiguration generic interface to set up the entity’s settings or configuration. We will keep our domain model simple, catering to the webshop (E-commerce) domain. Version 5.0.0 was released on August 11, 2012 and is targeted at .NET framework 4.5.
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- The HasAlternateKey method is used to specify an alternate key for an entity.
- All data access in Entity Framework Core happens through a class that inherits from DbContext.
- TPC’s primary benefit is that it eliminates the need for extra columns or tables to store hierarchy-related information, as each table is self-contained.
In the next article, I will discuss How to Install the Entity Framework Core in ASP.NET Core Application using Visual Studio. Here, I briefly introduced Entity Framework Core in this article, and I hope you enjoy this Introduction to Entity Framework Core article. Entity Framework Core is an ORM Tool that increases the developer’s productivity by reducing the redundant task of doing CRUD operations against a database in a .NET Core Application.
The Entity Framework is an Object/Relational Mapping (O/RM) framework that maps objects to relational databases. EF Core is designed to work with .NET Core applications but can also be used with standard .NET Framework applications based on Framework 4.5 or higher. The following diagram shows the supported types of applications that we can develop using EF Core. In Entity Framework (EF) Core, https://deveducation.com/ it’s a common practice to define a primary key for each table, as primary keys uniquely identify rows in a table. However, there are scenarios where you might want to create a table without a primary key, such as mapping to an existing database table or dealing with a non-standard database schema. You can achieve this using EF Core’s Fluent API by configuring the entity as a keyless entity.