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Entity Framework - (Entity Framework)

Entity Framework is a popular object-relational mapping (ORM) framework that allows developers to work with relational databases using a .NET object-oriented approach. In this tutorial, we'll discuss what Entity Framework is, its syntax, examples, explanation, use, important points, and summary.

Syntax

Entity Framework syntax uses LINQ (Language-Integrated Query), an extension to C# and VB.NET languages that provides a formal way to write queries using a syntax similar to SQL.

using Microsoft.EntityFrameworkCore;

public class BloggingContext : DbContext
{
    public DbSet<Blog> Blogs { get; set; }
    public DbSet<Post> Posts { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer(@"Server=(localdb)\mssqllocaldb;Database=MyDatabase;Trusted_Connection=True;");
    }
}

Example

Let's look at an example of how to use Entity Framework to create a database and query data.

using (var context = new BloggingContext())
{
    var blog = new Blog { Url = "http://sample.com" };
    context.Blogs.Add(blog);
    context.SaveChanges();
}

using (var context = new BloggingContext())
{
    var blogs = context.Blogs
        .Where(b => b.Url.Contains("sample"))
        .ToList();

    foreach (var blog in blogs)
    {
        Console.WriteLine(blog.Url);
    }
}

In this example, we create a new database context, add a new Blog entity to the context, and save changes. We then create a new database context to query the Blogs table and print out the URLs of any blogs that contain the word "sample".

Explanation

Entity Framework is a popular ORM framework that provides a way for developers to work with relational databases using a .NET object-oriented approach. Entity Framework represents data as entities and relationships between entities, and allows developers to query data using LINQ.

Use

Entity Framework is a good choice if you want to work with relational databases using a .NET object-oriented approach. With Entity Framework, you can model your data as objects and query your data using LINQ.

Important Points

Here are some important points to keep in mind when using Entity Framework:

  • Entity Framework can be used with a variety of databases, including SQL Server, MySQL, and PostgreSQL.
  • Entity Framework provides a way to model data as objects and relationships between objects.
  • Entity Framework allows you to query data using LINQ, a syntax similar to SQL.

Summary

In this tutorial, we discussed Entity Framework, an ORM framework that allows developers to work with relational databases using a .NET object-oriented approach. We covered syntax, examples, explanation, use, and important points of using Entity Framework in developing database-driven applications. By understanding Entity Framework, you can create more efficient and robust database designs within your .NET application.

Overview of ORM
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