dbcontext example

1. What is DbContext?
2. How can I get DbContext from entity?
3. What is DbContext in .NET core?
4. Is DbContext scoped?
5. What is scaffold DbContext?
6. What is DbSet and DbContext?
7. What is meant by Entity Framework?
8. What is lazy loading in Entity Framework?
9. Why is DbSet virtual?
10. Why is DbContext scoped?
11. Is Ado net an ORM tool?
12. Should DbContext be scoped or transient?

What is DbContext?

DbContext is an important class in Entity Framework API. It is a bridge between your domain or entity classes and the database. DbContext is the primary class that is responsible for interacting with the database. ... Querying: Converts LINQ-to-Entities queries to SQL query and sends them to the database.

How can I get DbContext from entity?

Defining a DbContext derived class

Once you have a context, you would query for, add (using Add or Attach methods ) or remove (using Remove ) entities in the context through these properties. Accessing a DbSet property on a context object represent a starting query that returns all entities of the specified type.

What is DbContext in .NET core?

A DbContext instance represents a session with the database and can be used to query and save instances of your entities. DbContext is a combination of the Unit Of Work and Repository patterns.

Is DbContext scoped?

Yes, the default life time for DbContext is scoped. This is intended this way. Instantiating DbContext is pretty cheap and it makes sure that the your do not use to many resources.

What is scaffold DbContext?

Reverse engineering is the process of scaffolding entity type classes and a DbContext class based on a database schema. It can be performed using the Scaffold-DbContext command of the EF Core Package Manager Console (PMC) tools or the dotnet ef dbcontext scaffold command of the . NET Command-line Interface (CLI) tools.

What is DbSet and DbContext?

A DbSet represents the collection of all entities in the context, or that can be queried from the database, of a given type. DbSet objects are created from a DbContext using the DbContext. Set method.

What is meant by Entity Framework?

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. Entity Framework (EF) is an open source ORM framework for ADO.NET which is a part of . NET Framework.

What is lazy loading in Entity Framework?

Lazy loading is the process whereby an entity or collection of entities is automatically loaded from the database the first time that a property referring to the entity/entities is accessed. Lazy loading means delaying the loading of related data, until you specifically request for it.

Why is DbSet virtual?

While the virtual keyword on the derived DbContext class (virtual DbSet<>) is used for testing purpose (mocking the DbSet property), virtual keyword in this case is not related to lazy loading.

Why is DbContext scoped?

It also allows you to use a single context in a certain scope, which has clear advantages, such as running code in a single business transaction, and being able to pass around entities, since they originate from the same DbContext .

Is Ado net an ORM tool?

NET ORM-related products includes ADO.NET providers for popular databases and cloud applications with advanced ORM support, visual ORM model designer and code generation tool, LINQ debugger and ORM profiler Visual Studio add-in, and Devart's own ORM solution.

Should DbContext be scoped or transient?

1 Answer. If you don't use any other injected services (which are also using your DBContext) there's no difference between scoped and transient. But if you use other injected services, with "transient" on the DBContext, every service gets his own instance of it.