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Entity Framework has come a long way since version 1. So much that it leapfrogged every other version up to version 7.

With EF Core 2 out, I feel this gives us the performance and versatility we need for faster data access.

Keep in mind, I’m not saying all of these are recommended, I’m merely including them as top ORMs I’ve found in the .NET community as possible replacements for EF.

Dapper

Dapper was built by the StackExchange group. This ORM delivers amazing results since it leverages ADO.NET.

To give you an idea of the performance, Matthew Jones from ExceptionNotFound.net conducted a performance benchmark between Dapper, Entity Framework, and ADO.NET. His benchmark shows Dapper delivering exceptional performance over Entity Framework and narrowly edges out even ADO.NET.

While the performance is worthy, the technique of getting the data reminds me of the old days of retrieving data.

Here is a code example from their GitHub page:

public class Dog
{
     public int? Age { get; set; }
     public Guid Id { get; set; }
     public string Name { get; set; }
     public float? Weight { get; set; }
     public int IgnoredProperty { get { return 1; } }
}

var guid = Guid.NewGuid();
var dog = connection.Query("
                    select Age = @Age, Id = @Id", 
                          new { Age = (int?)null, Id = guid });
Assert.Equal(1,dog.Count());
Assert.Null(dog.First().Age);
Assert.Equal(guid, dog.First().Id);

As you can see, it uses inline SQL to pull back the record and map it. The only thing missing is the left-to-right assignment.

Their GitHub page has a lot of examples like this.

nHibernate

nHibernate (introduced in 2007) is one of the oldest and most stable ORMs around and has been around longer than Entity Framework (introduced in 2008).

Most companies run their entire data access on NHibernate and are one of the most stable ORM frameworks around.

I’ve heard tales of woe and tales of wonder with this product. It has a number of ways to configure your mappings whether it be in code or through XML.

While I’ve never worked with the product, it’s definitely vast in its configuration settings making it quite versatile.

Example Code:

//Add a Customer to the datastore

//'sessionFactory' is a thread-safe object 
  built once per application lifetime (can take seconds to build)

//based on configuration files which control 
       how database tables are mapped to C# objects

//(e.g. which property maps to which column in a database table)

//

//'session' is not thread safe and fast to obtain 
      and can be thought of as a connection to the database

using (var session = sessionFactory.OpenSession()) 
{
   //transaction represents a db transaction
   using (ITransaction transaction = session.BeginTransaction()) 
   {

       //The line below adds the customer to NHibernate's list 
              of objects to insert to the database

       //but it doesn't execute SQL insert command at this stage*.

      //*if the Id field is generated by the database 
         (e.g. an auto-incremented number)

      //then NHibernate will execute SQL INSERT when .Save is called

      session.Save(new Customer 
                  { 
                    Id = Guid.NewGuid(), 
                    FirstName = "Boss", 
                    Age = 50 
                  });

     //The call below will execute the 
          SQL INSERT and commit the transaction

     transaction.Commit();

   }
}

//Retrieve the Customer from the database, modify 
       the record and update the database

using (var session = sessionFactory.OpenSession())
{
   using (ITransaction transaction = session.BeginTransaction()) 
   {
       //session's Query returns IQueryable.
       //Only when .FirstOrDefault is called will NHibernate 
           execute the SQL query
       Customer customer = session.Query()
                                   .Where(c =>c.Token == token )
                                   .FirstOrDefault();
       //Now the customer is 'part of' the 'session' object 
            and NHibernate keeps track of changes
       //made to it
        if( customer != null ) 
        {
           //Changing a property of an object does NOT cause SQL 
              to be executed
            customer.TokenVerified = true;
            //Committing the transaction results in an SQL UPDATE 
              statement
            //NHibernate kept track of the fact that 'customer' 
               has been changed since loading
            transaction.Commit();

         }
     }
}

Replacing the SQL statements with LINQ makes this example better in my opinion.

Why just two?

When examining the landscape of ORMs, I referred to a wiki page listing of object-relational mapping software for.NET.

Now, I don’t want to alarm anyone, but after looking through this list of ORMs, I realized that 75% of them were names I’ve never heard of, don’t exist, or aren’t active.

I tried to remember some ORMs my colleagues used in the past. I remember the majority mentioning Entity Framework and NHibernate as their tool of choice with Dapper being the new guy on the block. In that order.

Even though Dapper is new, I couldn’t find any other mature, solid, stable, or popular ORMs

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About The Author

Deependra Kushwah
Deependra kushwah is a member of the fastest growing bloggers community "betechnical", Author, Youtuber, and hardcore Coder. I love writing code in different languages, I also write blogs on tech tutorials, gadgets review and also post some technical videos on youtube on many topics.

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