Difference between LINQ to SQL and Entity Framework

28 Dec 2023
Intermediate
41.1K Views
5 min read  

LINQ to SQL Vs Entity Framework: An Overview

The LINQ to SQL allows us to query and modify SQL Server databases by using LINQ syntax. Entity framework is a great ORM shipped by Microsoft which allows us to query and modify RDBMS like SQL Server, Oracle, DB2 MySQL, etc. by using LINQ syntax. Today, EF is widely used by every .NET application to query to database.

However, if you especially want to learn Entity Framework from scratch have a look at the Entity Framework Tutorial. Here we Provided Beginner, Intermediate, and Advanced concepts of Entity Framework. Now let's see the difference between LINQ to SQL and Entity Framework.If we talk about Both technologies they are somewhat similar. Although they provide an ORM framework. But, there are some important differences.

1) SQL Server only:

The LINQ to SQL works only with SQL Server, especially SQL 2005 and above. Also, It works in a limited way with SQL 2000. On the other hand, Entity framework works with most databases like Oracle, Postgres, DB2, MySQL, and plenty more.

2) One-to-One mapping:

The LINQ to SQL is much simpler than Entity Framework. Because it provides an exact one-to-one mapping between the database table and the class. In terms of the Entity framework, there is a many-to-many relation between the database table and the class. A single database table can map to multiple classes. Or a single class can map to multiple tables.

3) Complex types:

Entity framework allows complex types to be defined. For example, consider the Contact table with the telephone number field. The telephone number is a complex type with properties such as international code, telephone number, and extension. Entity Framework can handle such complex types very well than LINQ to SQL. LINQ to SQL has no support for complex types.

4) Model file format:

In terms of model file format, a DBML file represents the model for LINQ to SQL. The model represents the mapping between the classes and the storage tables. For Entity Framework an EDMX file stores the model.

5) Database first approach:

LINQ to SQL always has a Database-first approach. While Entity framework has three approaches: Database first, Model first, and Code first.

1. Database first: Generate model and classes from the database.

2. Model first: Generate database and classes from the model.

3. Code first: Generate database and model from classes.

LINQ to SQL Vs Entity Framework both Differences in a nutshell:

LINQ to SQL
Entity Framework
It only works with SQL Server Database.
It can work with various databases like Oracle, DB2, MYSQL, SQL Server, etc.
It generates a .dbml to maintain the relation
It generates a .edmx file initially. The relation is maintained using 3 different files .csdl, .msl, and .ssdl
It has no support for complex types.
It has support for complex types.
It cannot generate a database from the model.
It can generate a database from the model.
It allows only one-to-one mapping between the entity classes and the relational tables /views.
It allows one-to-one, one-to-many & many-to-many mappings between the Entity classes and the relational tables /views
It allows you to query data using DataContext.
It allows you to query data using EntitySQL, ObjectContext, and DbContext.
It provides a tightly coupled approach.
It provides a loosely coupled approach. Since its code-first approach allows you to use a Dependency Injection pattern which makes it loosely coupled.
It can be used for rapid application development only with SQL Server.
It can be used for rapid application development with RDBMS like SQL Server, Oracle, DB2 MySQL, etc.
Summary:

I hope you will enjoy the LINQ to SQL and EF while playing with the database. I would like to have feedback from my blog readers. Your valuable feedback, questions, or comments about this article are always welcome. Also, Check the below link to learn more about the Entity framework if you have a passion. Enjoy coding...!

Unlock the next level of Entity Framework:

FAQs

Q1. Why LINQ over SQL?

In terms of LINQ, It provides flexibility, familiarity, and developer-friendly syntax, while SQL excels in handling complex relational operations and optimized database performance.

Q2. Why use Entity Framework instead of SQL?

The SQL has better performance and flexibility, but lower ease of use and code maintainability. While Entity Framework Core, on the other hand, has better ease of use, security, and code maintainability, but may not perform as well in some scenarios

Q3. When should I use Entity Framework?

With the Entity Framework, programmers can work at a higher level of abstraction when they deal with data and can create and maintain data-oriented applications with less code.
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About Author
Shailendra Chauhan (Microsoft MVP, Founder & CEO at Scholarhat by DotNetTricks)

Shailendra Chauhan is the Founder and CEO at ScholarHat by DotNetTricks which is a brand when it comes to e-Learning. He provides training and consultation over an array of technologies like Cloud, .NET, Angular, React, Node, Microservices, Containers and Mobile Apps development. He has been awarded Microsoft MVP 8th time in a row (2016-2023). He has changed many lives with his writings and unique training programs. He has a number of most sought-after books to his name which has helped job aspirants in cracking tough interviews with ease.
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