In this scenario, the same context class is used to retrieve and save entities. These source-specific providers abstract the ADO.NET interfaces used to connect to the database while programming against the conceptual schema. It uses a command tree to translate standard SQL languages like LINQ into native SQL expressions, which it then executes on the given DBMS system. The Object Services layer includes the Object Context, representing the interaction session between the applications and the data source.
Once you click on the Next button, it will open Choose Your Database Objects as shown below. From the below window, select the “Departments” and “Employees” tables. Change the Model Namespace to “EmployeeModel” and click on the “Finish” button as shown in the below image. Once you click on the Next button, It will open choose your data connection wizard as shown below. From this window click on the New Connection button as shown in the below image. A third version of Entity Framework, version 4.1, was released on April 12, 2011, with Code First support.
Entity Data Model
Proceeding further, you will see the comparison between EF6 and EF Core. When an entity has the property of generic collection type, it is known as collective navigation property. Entity Framework Core is the new and improved version of Entity Framework for .NET Core applications. Pranaya Rout has published more than 3,000 articles in his 11-year career.
Once you click on the OK button, you will be back on to the “Choose Your Data Connection” window as shown below. Once you click on the Add button, it will open the Choose Data Model wizard as shown below. From this window select “EF Designer from database” and click on the Next button as shown in the below image.
Entity Framework Development Approaches
The fundamental purpose of the Object Context is to conduct various operations, such as adding and deleting instances of things and querying the database to save the modified state. Either way, Entity Framework works out how to move from your conceptual model to your database. So, you can query against your conceptual model objects and work directly with them. Entity Framework has a more granular mapping layer so you can customize mappings, for example, by mapping the single entity to multiple database tables or even multiple entities to a single table.
Entity Framework is an Object Relational Mapper (ORM) which is a type of tool that simplifies mapping between objects in your software to the tables and columns of a relational database. The C# Entity Framework is a set of ADO.NET technologies that aid in developing data-driven software. C# Entity framework is an Object Relational Mapping (ORM) framework that gives developers an automated way to store and access databases. The Entity Framework allows developers to work with data at a higher level of abstraction.
Querying data
Here, select the “EF Designer from database” option as we are going to use the Entity Framework Database First Approach. Once the database is ready, in the next step, create a new “Console Application” with the name EFDemo as shown in the below image. We want to display the data from both tables (Departments and Employees) in a console application as shown below. The version 4.3.1 was released on February 29, 2012.[10] There were a few updates, like support for migration.
The following diagram illustrates where the Entity Framework fits into our application. A refresh of version 4.1, named Entity Framework 4.1 Update 1, was released on July 25, 2011. Most of the time you don’t have to write any SQL yourself, and iterating is very easy using your language built in functions. When you make any changes to the object, the ORM will usually detect this, and mark the object as ‘modified’. When you save all the changes in your ORM to the database, the ORM will automatically generate insert/update/delete statements, based on what you did with the objects. There are other ORMs in the marketplace such as NHibernate and LLBLGen Pro.
EF Core Database Providers
Entity Framework is an ORM Tool and ORMs Tools are basically used to increase the developer’s productivity by reducing the redundant task of doing CRUD operation against a database in a .NET Application. Run the application and notice that Departments and Employees data are displayed as expected as shown in the below image. We have achieved all this without writing a single line of ADO.NET code.
- We have achieved all this without writing a single line of ADO.NET code.
- It provides an abstract level to the developers to work with a relational table and columns by using the domain-specific object.
- Entity Framework Core is the new version of Entity Framework after EF 6.x.
- EF Core continues to support the following features and concepts, same as EF 6.
- It is the normal .NET CLR class that’s why it is named “Plain Old CLR Objects”.
- The Object Services layer includes the Object Context, representing the interaction session between the applications and the data source.
Learn Entity Framework using simple yet practical examples on EntityFrameworkTutorial.net for free. While using this site, you agree to have read and accepted our terms
of use and privacy policy. In code, you might want to work with objects in an object oriented fashion. This website provides tutorials with examples, code snippets, and practical insights, making it suitable for both beginners and experienced developers.
Entities
I have a small question and request regarding the code-first approach with Entity Framework Core. The following figure describes where the Entity Framework present in your application. 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. Once you click on the Next button, it will open a popup asking you to choose the Entity Framework version as shown below. From this window, select Entity Framework 6.x and click on the Next button as shown in the below image.
For this, we need to create a Connection Object with the database, then Open the Connection, Create the Command Object and execute the Command using Data Reader or Data Adapter. And then we create DataSet or DataTables to store the data in memory to perform different types of Operations on the Data as per the business requirements. Entity Framework (EF) is an object-relational mapper for .NET developers that allows them to work with relational data using domain-specific objects. It eliminates the majority of the data-access code that developers must routinely write. Queries against the object model are written using the LINQ-to-Entities (L2E) query language. EF API translates LINQ-to-Entities queries to SQL queries for relational databases using EDM and also converts results back to entity objects.
Entity Framework allows you to develop and maintain data-oriented apps with less code than traditional applications. As per the above figure, Entity Framework fits between the business entities (Domain Classes) and the database. It saves the data in the business properties entities and also retrieves the data from the database what is entity framework and converts it into the business entity’s object automatically. It is the most crucial class when it comes to working with EF 6 or EF Core. It helps execute the create, read, update, and delete commands in a database schema. It is also used to configure domain classes, map databases, track changes, and store cache.
