C#

{
  "ConnectionStrings": {
    "MySQL": "server=localhost;port=3307;user=root;password=root;database=JarekDB"

  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}




           //Enable CORS
            services.AddCors(c =>
            {
                c.AddPolicy("AllowOrigin", options => options.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader());
            });

            //JSON Serializer
            services.AddControllersWithViews().AddNewtonsoftJson(options =>
            options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore)
                .AddNewtonsoftJson(options => options.SerializerSettings.ContractResolver
                = new DefaultContractResolver());



using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using MySqlConnector;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Threading.Tasks;

namespace MySqlWebApi.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class UserController : ControllerBase
    {
        private readonly IConfiguration _configuration;
        public UserController(IConfiguration configuration)
        {
            _configuration = configuration;
        }


        [HttpGet]
        public JsonResult Get()
        {

            string query = @"select * from  users";
            string sqlDataSource = _configuration.GetConnectionString("MySQL");
            DataTable table = new DataTable();
            MySqlDataReader myReader;
            using (MySqlConnection myCon = new MySqlConnection(sqlDataSource))
            {
                myCon.Open();
                using (MySqlCommand myCommand = new MySqlCommand(query, myCon))
                {
                    myReader = myCommand.ExecuteReader();
                    table.Load(myReader);
                    myReader.Close();
                    myCon.Close();
                }
            }

            return new JsonResult(table);
        }



        [HttpGet("{id}")]
        public JsonResult GetUser(int id)
        {

            string query = @"select * from  users where id="+id;
            string sqlDataSource = _configuration.GetConnectionString("MySQL");

            DataTable table = new DataTable();

            MySqlDataReader myReader;
            using (MySqlConnection myCon = new MySqlConnection(sqlDataSource))
            {
                myCon.Open();
                using (MySqlCommand myCommand = new MySqlCommand(query, myCon))
                {
                    myReader = myCommand.ExecuteReader();
                    table.Load(myReader);
                    myReader.Close();
                    myCon.Close();
                }
            }

            return new JsonResult(table);
        }
    }



}












class Samochod
    {
        public string marka;
        public int predkosc;

        public void Przyspiesz(int a)
        {
            predkosc += a;
        }

        public static Samochod operator + (Samochod s1, Samochod s2)
        {
            Samochod s3 = new Samochod();
        ...
        ...


            return s3;
        }
...
...