Parameters in Raw SQL Queries with FromSql Method in Entity Framework Core

You can pass parameters to a raw SQL query executed using the FromSql method. This helps to prevent SQL injection attacks and makes the code more readable.

using EntityFrameworkCore_ConsoleApp.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var status = true;
                var products = databaseContext.Products.FromSql($"select * from product where status = {status}").ToList();
                products.ForEach(product =>
                {
                    Console.WriteLine("Id: " + product.Id);
                    Console.WriteLine("Name: " + product.Name);
                    Console.WriteLine("Price: " + product.Price);
                    Console.WriteLine("Quantity: " + product.Quantity);
                    Console.WriteLine("Description: " + product.Description);
                    Console.WriteLine("Status: " + product.Status);
                    Console.WriteLine("Photo: " + product.Photo);
                    Console.WriteLine("Created: " + product.Created.ToString("dd/MM/yyyy"));
                    Console.WriteLine("Category Id: " + product.CategoryId);
                    Console.WriteLine("---------------------");
                });
            }
        }
    }
}

Output

Id: 9
Name: Tivi 1
Price: 10
Quantity: 15
Description: Description 1
Status: True
Photo: photo1.gif
Created: 20/10/2023
Category Id: 1
---------------------
Id: 12
Name: Laptop 1
Price: 15
Quantity: 16
Description: Description 3
Status: True
Photo: photo4.gif
Created: 20/10/2021
Category Id: 2
---------------------
Id: 14
Name: Computer 1
Price: 17
Quantity: 34
Description: Description 5
Status: True
Photo: photo6.gif
Created: 20/12/2023
Category Id: 3
---------------------
Id: 16
Name: Computer 3
Price: 19
Quantity: 18
Description: Description 7
Status: True
Photo: photo8.gif
Created: 20/05/2023
Category Id: 3
---------------------

Use AND condition in Where:

using EntityFrameworkCore_ConsoleApp.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var min = 5;
                var max = 20;
                var products = databaseContext.Products.FromSql($"select * from product where price >= {min} and price <= {max}").ToList();
                products.ForEach(product =>
                {
                    Console.WriteLine("Id: " + product.Id);
                    Console.WriteLine("Name: " + product.Name);
                    Console.WriteLine("Price: " + product.Price);
                    Console.WriteLine("Quantity: " + product.Quantity);
                    Console.WriteLine("Description: " + product.Description);
                    Console.WriteLine("Status: " + product.Status);
                    Console.WriteLine("Photo: " + product.Photo);
                    Console.WriteLine("Created: " + product.Created.ToString("dd/MM/yyyy"));
                    Console.WriteLine("Category Id: " + product.CategoryId);
                    Console.WriteLine("---------------------");
                });
            }
        }
    }
}

Output

Id: 9
Name: Tivi 1
Price: 10
Quantity: 15
Description: Description 1
Status: True
Photo: photo1.gif
Created: 20/10/2023
Category Id: 1
---------------------
Id: 10
Name: Tivi 2
Price: 5
Quantity: 22
Description: Description 2
Status: False
Photo: photo2.gif
Created: 20/04/2022
Category Id: 1
---------------------
Id: 11
Name: Tivi 3
Price: 20
Quantity: 4
Description: Description 2
Status: False
Photo: photo3.gif
Created: 20/11/2022
Category Id: 1
---------------------
Id: 12
Name: Laptop 1
Price: 15
Quantity: 16
Description: Description 3
Status: True
Photo: photo4.gif
Created: 20/10/2021
Category Id: 2
---------------------
Id: 14
Name: Computer 1
Price: 17
Quantity: 34
Description: Description 5
Status: True
Photo: photo6.gif
Created: 20/12/2023
Category Id: 3
---------------------
Id: 16
Name: Computer 3
Price: 19
Quantity: 18
Description: Description 7
Status: True
Photo: photo8.gif
Created: 20/05/2023
Category Id: 3
---------------------

Use OR condition in Where:

using EntityFrameworkCore_ConsoleApp.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var price1 = 5;
                var price2 = 15;
                var price3 = 20;
                var products = databaseContext.Products.FromSql($"select * from product where price = {price1} or price = {price2} or price = {price3}").ToList();
                products.ForEach(product =>
                {
                    Console.WriteLine("Id: " + product.Id);
                    Console.WriteLine("Name: " + product.Name);
                    Console.WriteLine("Price: " + product.Price);
                    Console.WriteLine("Quantity: " + product.Quantity);
                    Console.WriteLine("Description: " + product.Description);
                    Console.WriteLine("Status: " + product.Status);
                    Console.WriteLine("Photo: " + product.Photo);
                    Console.WriteLine("Created: " + product.Created.ToString("dd/MM/yyyy"));
                    Console.WriteLine("Category Id: " + product.CategoryId);
                    Console.WriteLine("---------------------");
                });
            }
        }
    }
}

Output

Id: 10
Name: Tivi 2
Price: 5
Quantity: 22
Description: Description 2
Status: False
Photo: photo2.gif
Created: 20/04/2022
Category Id: 1
---------------------
Id: 11
Name: Tivi 3
Price: 20
Quantity: 4
Description: Description 2
Status: False
Photo: photo3.gif
Created: 20/11/2022
Category Id: 1
---------------------
Id: 12
Name: Laptop 1
Price: 15
Quantity: 16
Description: Description 3
Status: True
Photo: photo4.gif
Created: 20/10/2021
Category Id: 2
---------------------