auto_service/AutoService/Models/ProceedRepository.cs

using Microsoft.Extensions.Options;
using MySqlConnector;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AutoService.Models
{
    public class ProceedRepository : BaseRepository, IProceedRepository
    {
        public ProceedRepository(IOptions<DatabaseSettings> databaseSettings) : base(databaseSettings)
        {
        }

        public void SaveOrder(IEnumerable<Work> works, Order order)
        {
            try
            {
                OpenConnection();
                string sql1 = "INSERT INTO orders (id, client_name, car_model, service_id, total_amount, discount_percent, order_date) VALUES(0, @ClientName, @AutoModel, @ServiceId, @TotalAmount, @DiscountPercent, '@Date);";
                string sql2 = "SELECT LAST_INSERT_ID() as id;";
                string sql3 = "INSERT INTO auto_service_db.order_items (id, order_id, work_id, work_price) VALUES(0, @OrderId, @WorkId, @WorkPrice);";
                using var transaction = connection.BeginTransaction();
                int newId;
                try
                {
                    using (var mc = new MySqlCommand(sql1, connection, transaction))
                    {
                        mc.Parameters.AddWithValue("@ClientName", order.ClientName);
                        mc.Parameters.AddWithValue("@AutoModel", order.AutoModel);
                        mc.Parameters.AddWithValue("@ServiceId", order.ServiceId);
                        mc.Parameters.AddWithValue("@TotalAmount", order.TotalPrice);
                        mc.Parameters.AddWithValue("@DiscountPercent", order.DiscountPercent);
                        mc.Parameters.AddWithValue("@Date", DateTime.Now);
                        mc.ExecuteNonQuery();
                    }
                    using (var mc = new MySqlCommand(sql2, connection, transaction))
                    using (var reader = mc.ExecuteReader())
                    {
                        newId = reader.GetInt32("id");
                    }
                    foreach (var work in works)
                    {
                        using (var mc = new MySqlCommand(sql3, connection, transaction))
                        {
                            mc.Parameters.AddWithValue("@OrderId", newId);
                            mc.Parameters.AddWithValue("@WorkId", work.Id);
                            mc.Parameters.AddWithValue("@WorkPrice", work.Price);
                            mc.ExecuteNonQuery();
                        }
                    }
                    transaction.Commit();

                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex);
                }
                CloseConnection();
            }catch(Exception e)
            {
                Console.WriteLine(e);
            }
        }
    }
}