To access all the RaceResults rows for a racer, you need to do a SQL join statement. For example, the sample database Formula1 contains the Racers and RaceResults tables. Relational databases and object-oriented languages define associations differently. The ADO.NET Entity Framework provides a mapping from the relational database schema to objects.
#Visual studio entity framework designer code first tutorial how to
Finally, you'll learn how POCO (Plain Old CLR Objects) can be used with the Entity Framework, and how to use the Code First programming model. Also described are object tracking and how the data context holds change information for updating data. This tutorial also describes different ways to access the database from the code directly with the Entit圜lient provider, using Entity SQL or helper methods that create Entity SQL, and using LINQ to Entities. Different relationships between entities are covered, such as one table per hierarchy of objects, one table per type, and n-to-n relationships. You will learn about the mappings between the database and the entity classes using the Conceptual Schema Definition Language (CSDL), the Store Schema Definition Language (SSDL), and the Mapping Schema Language (MSL). This tutorial provides information about all these programming models. Using Code First, mapping information is all done via C# code. Both Model First and Database First provide mapping information with a mapping file. You can use different programming models with the Entity Framework: Model First, Database First, and Code First.
The ADO.NET Entity Framework is an object-relational mapping ( ORM) framework that offers an abstraction of ADO.NET to get an object model based on the referential databases. Entity Framework is the recommended object-relational mapping (ORM) modeling technology for new. It eliminates the need for most of the data-access code that developers usually need to write. NET developers to work with relational data by using domain-specific objects. Entity Framework Introduction to the Entity FrameworkĮntity Framework is an object-relational mapping technology that enables.