Nov2611/AddOrder.cs

using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace NeshinaPolina07_11
{
    public partial class AddOrder : Form
    {
        private readonly MySqlConnection _connection;

        public AddOrder()
        {
            InitializeComponent();
            _connection = DB.GetInstance().GetConnection();
            LoadPickupPoints();
            LoadUsers();
            LoadStatuses();
            dtpOrderDate.Value = DateTime.Now;
            dtpDeliveryDate.Value = DateTime.Now.AddDays(3);
        }

        private void LoadPickupPoints()
        {
            LoadComboBox("pickup_points", "point_id", "address", cmbPickupPoint);
        }

        private void LoadUsers()
        {
            LoadComboBox("users", "user_id", "full_name", cmbUser);
        }

        private void LoadStatuses()
        {
            LoadComboBox("order_statuses", "status_id", "status_name", cmbStatus);
        }

        private void LoadComboBox(string table, string idCol, string nameCol, ComboBox combo)
        {
            string query = $"SELECT {idCol}, {nameCol} FROM {table} ORDER BY {nameCol}";
            using (var cmd = new MySqlCommand(query, _connection))
            using (var adapter = new MySqlDataAdapter(cmd))
            {
                var dt = new DataTable();
                adapter.Fill(dt);
                combo.DataSource = dt;
                combo.DisplayMember = nameCol;
                combo.ValueMember = idCol;
                combo.SelectedIndex = -1;
            }
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            if (cmbPickupPoint.SelectedValue == null)
            {
                MessageBox.Show("Выберите пункт выдачи.", "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            if (cmbUser.SelectedValue == null)
            {
                MessageBox.Show("Выберите пользователя.", "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            if (cmbStatus.SelectedValue == null)
            {
                MessageBox.Show("Выберите статус заказа.", "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            if (string.IsNullOrWhiteSpace(txtReceiveCode.Text))
            {
                MessageBox.Show("Введите код получения.", "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            if (!string.IsNullOrWhiteSpace(txtReceiveCode.Text))
            {
                if (!int.TryParse(txtReceiveCode.Text, out int quantity) || quantity < 0)
                {
                    MessageBox.Show("Введите код получения цифрами", "Некорректный код", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    txtReceiveCode.Focus();
                    return;
                }
            }

            try
            {
                string getMaxIdQuery = "SELECT MAX(order_id) FROM orders";
                using (var cmd = new MySqlCommand(getMaxIdQuery, _connection))
                {
                    object result = cmd.ExecuteScalar();
                    int nextOrderId = result == DBNull.Value ? 1 : Convert.ToInt32(result) + 1;

                    string query = @"
        INSERT INTO orders (order_id, order_date, delivery_date, pickup_point_id, user_id, receive_code, status_id)
        VALUES (@order_id, @order_date, @delivery_date, @pickup_point_id, @user_id, @receive_code, @status_id)";

                    using (var insertCmd = new MySqlCommand(query, _connection))
                    {
                        insertCmd.Parameters.AddWithValue("@order_id", nextOrderId);
                        insertCmd.Parameters.AddWithValue("@order_date", dtpOrderDate.Value);
                        insertCmd.Parameters.AddWithValue("@delivery_date", dtpDeliveryDate.Value);
                        insertCmd.Parameters.AddWithValue("@pickup_point_id", cmbPickupPoint.SelectedValue);
                        insertCmd.Parameters.AddWithValue("@user_id", cmbUser.SelectedValue);
                        insertCmd.Parameters.AddWithValue("@receive_code", txtReceiveCode.Text.Trim());
                        insertCmd.Parameters.AddWithValue("@status_id", cmbStatus.SelectedValue);

                        insertCmd.ExecuteNonQuery();
                    }
                }

                MessageBox.Show("Заказ успешно добавлен.", "Успех", MessageBoxButtons.OK, MessageBoxIcon.Information);
                DialogResult = DialogResult.OK;
                Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show($"Ошибка при добавлении заказа: {ex.Message}", "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void cmbStatus_SelectedIndexChanged(object sender, EventArgs e)
        {

        }
    }
}