Dotnet Core API Crud With Mysql and EF Core

Mon, 29 Dec 2025 11:19:51 +0530

In this tutorial, we are going to make dotnet core web api application and perform all the CRUD (create, read, update and delete). I have tried to keep it simple and avoided any complexities like repository pattern.

💻Source code

Tech and tools used

Dotnet 10
MySql 8+ (in docker container. Click here, if you want to create a MySql container in docker)
Entity Framework Core (ORM)
.NET CLI and VS Code (alternate Visual Studio 2025)

Creating a project

Execute these commands in a sequence.

Cartesian Explosion and Split Query in Entity Framework Core

Sun, 07 Dec 2025 20:03:37 +0530

In this tutorial, we will understand what cartesian explosion is and how to solve that problem. Let’s look at this query:

var people = await ctx.People
 .Include(p => p.Emails)
 .Include(p => p.Addresses)
 .ToListAsync();

It translates to:

 SELECT "p"."Id", "p"."FirstName", "p"."LastName", "e"."Id", "e"."PersonEmail", "e"."PersonId", "a"."Id", "a"."PersonAddress", "a"."PersonId"
 FROM "People" AS "p"
 LEFT JOIN "Emails" AS "e" ON "p"."Id" = "e"."PersonId"
 LEFT JOIN "Addresses" AS "a" ON "p"."Id" = "a"."PersonId"
 ORDER BY "p"."Id", "e"."Id"

Person joins with Email and Address. Both joins are at the same level.
A person can have multiple emails and adressess.

Let’s say a person with id = 1 have 10 emails and 10 addresses. The query returns 1x10x10 = 100 rows for 1 person. It is just for one person, how much they can be for 100 people. This problem is known as cartesian explosion

Efcore on Ravindra Devrani

Dotnet Core API Crud With Mysql and EF Core

Tech and tools used

Creating a project

Cartesian Explosion and Split Query in Entity Framework Core