demMalyhinMerkulov/AddProductForm.cs

using MySql.Data.MySqlClient;
using System;
using System.Data;
using System.Windows.Forms;

namespace megadem
{
    public partial class AddProductForm : Form
    {
        public AddProductForm()
        {
            InitializeComponent();
            LoadTypes();
        }

        private void LoadTypes()
        {
            DB db = new DB();
            DataTable types = new DataTable();
            MySqlDataAdapter adapter = new MySqlDataAdapter();
            MySqlCommand command = new MySqlCommand("SELECT ProductType FROM Product_type", db.getConnection());

            try
            {
                db.openConnection();
                adapter.SelectCommand = command;
                adapter.Fill(types);

                comboBoxType.DataSource = types;
                comboBoxType.DisplayMember = "ProductType";
                comboBoxType.ValueMember = "ProductType";
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка загрузки типов " + ex.Message);
            }
            finally
            {
                db.closeConnection();
            }
        }

        private async void btnAdd_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(Article.Text) || string.IsNullOrEmpty(NameProd.Text) || string.IsNullOrEmpty(MinPrice.Text) || string.IsNullOrEmpty(Width.Text))
            {
                MessageBox.Show("Заполните все обязательные поля!");
                return;
            }




            if (!decimal.TryParse(MinPrice.Text, out decimal price) || price <= 0)
            {
                MessageBox.Show("Пожалуйста введите корректное значение цены");
                return;
            }


            DB db = new DB();

            try
            {
                db.openConnection();

                string query = "INSERT INTO Product (Product_type_id, Product_name, Article, Min_price_partner, Width)" +
                   "VALUES ((SELECT idProduct_type FROM Product_type WHERE ProductType = @type), @pr_name, @article, @price, @sale)";

                using (MySqlCommand command = new MySqlCommand(query, db.getConnection()))
                {

                    command.Parameters.AddWithValue("@article", Article.Text);
                    command.Parameters.AddWithValue("@pr_name", NameProd.Text);
                    command.Parameters.AddWithValue("@price", price);
                    command.Parameters.AddWithValue("@type", comboBoxType.SelectedValue.ToString());
                    command.Parameters.AddWithValue("@sale", Width.Text);

                    int rowsAffected = await command.ExecuteNonQueryAsync();

                    if (rowsAffected > 0)
                    {
                        MessageBox.Show("Товар успешно добавлен!");
                        DialogResult = DialogResult.OK;
                        this.Hide();
                        MainForm form = new MainForm();
                        form.Show();

                    }
                    else
                    {
                        MessageBox.Show("Ошибка при добавлении продукта.");
                    }
                }
            }
            catch (MySqlException ex)
            {
                if (ex.Number == 1452)
                {
                    MessageBox.Show("Указанная категория не существует. Введите допустимое название категории.");
                }
                else
                {
                    MessageBox.Show("Ошибка базы данных: " + ex.Message);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Произошла: " + ex.Message);
            }
            finally
            {
                db.closeConnection();
            }

        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Hide();
            MainForm mainForm = new MainForm();
            mainForm.Show();
        }
    }
}