EF Core mainly targets the code-first approach and provides little support for the database-first approach because the visual designer or wizard for DB model is not supported as of EF Core 2.0. It uses EDM in building SQL queries from LINQ queries, building INSERT, UPDATE, and DELETE commands, and transform database result into entity objects. Each record’s type is distinguished by a Discriminator column, which usually holds a simplified C# type name. The Discriminator column is invisible to developers from C#, but we can see it in the database schema generated by EF Core 5.
ADO.Net seems to refer directly to the technology for data sets and data tables. Now copy and paste the following code in the main method of the program class as shown below. From our next article onwards, I am going to explain everything in detail.
How to improve data access performance in EF Core
It enables developers to work with data using objects of domain specific classes without focusing on the underlying database tables and columns where this data is stored. Entity Framework is an open-source ORM (Object Relational Mapping) Framework for the .NET applications supported by Microsoft. It enables the developers to work with the data using the objects of domain-specific classes without focussing on the database tables and columns where the data is stored. With the Entity Framework, developers can work at a higher level of abstraction when developers deal with the data. With the help of Entity Framework, we can create and maintain data-oriented applications with less code when compared with traditional applications. The above figure represents how an entity framework interacts with the domain class and database.
As per the above figure, Entity Framework fits between the business entities (domain classes) and the database. If you have an existing database and database tables are already there, then you need what is entity framework to use the EF Core Database First Approach. In the database-first approach, the EF Core creates the DBContext and Domain classes based on the existing database schema using EF Core Command.
Entity Framework What is Entity Framework Discover the Basic About EF6
Looking over our models, we can see some conventional patterns emerge. Naming is an essential part of EF Core modeling, where we define relationships by the Type of property definitions and their names. We had mentioned that both a Movie and a Series could be a Production. EF Core 5 applies an approach known as Table-per-hierarchy (TPH), where we store hierarchically related entities in a single table. Entity Framework (EF) is an open source[2] object–relational mapping (ORM) framework for ADO.NET. It was originally shipped as an integral part of .NET Framework, however starting with Entity Framework version 6.0 it has been delivered separately from the .NET Framework.
Having .NET Core, Visual Studio, and SQL Server installed on your computer is good. EF Core continues to support the following features and concepts, same as EF 6. However, it can also be used with standard .NET 4.5+ framework based applications. Unlike the previous query, this example only uses the Rating entity, which results in the following SQL. We can see that EF Core applies a sub-query to retrieve the average rating value of a Production. Additionally, it uses an additional sub-query to order our results.
We have a many to many relationship between our Production and the Actors. We also have a one to many relationship, where a Production can have many instances of a Rating. When we finish setting up our project, we can run the dotnet-ef command, where the EF unicorn will greet us.
However, lazy loading can be costly in terms of performance because multiple database queries may be required to load the data. So, in simple words, we can say that the ORM Framework eliminates the need for most of the data access code that, as a developer, we generally write. EF API does not create any column for the collection navigation property in the related table of an entity,
but it creates a column in the table of an entity of generic collection. For example, the following Grade entity contains a generic collection navigation property ICollection.
- The Entity Framework Core is an updated and enhanced version of the Entity Framework designed for .NET Core applications.
- In the code-first approach, EF Core API creates the database and tables using migration based on the conventions and configuration provided in your domain classes.
- To change this behavior and optimize batch updates, you can take advantage of the UpdateRange() method as shown in the code snippet given below.
- So, in simple words, we can say that the ORM Framework eliminates the need for most of the data access code that, as a developer, we generally write.
Entity Framework is an open-source object-relational mapper framework for .NET applications supported by Microsoft. It eliminates the need for most of the data-access code which is used to interact with the database that developers usually need to write. It provides an abstract level to the developers to work with a relational table and columns by using the domain-specific object. It also reduces the code size of the data specific applications and also the readability of the code increases by using it. This is a new technology for accessing the data for Microsoft application. Entity Framework is an open-source ORM framework for .NET applications supported by Microsoft.
