Nov2611/EditOrder.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 EditOrder : Form
    {
        private readonly int _orderId;
        private readonly MySqlConnection _connection;
        public EditOrder(int orderId)
        {
            InitializeComponent();
            _orderId = orderId;
            _connection = DB.GetInstance().GetConnection();
            LoadComboBoxes();
            LoadOrderData();
        }
        private void LoadComboBoxes()
        {
            LoadComboBox("pickup_points", "point_id", "address", cmbPickupPoint);
            LoadComboBox("users", "user_id", "full_name", cmbUser);
            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 LoadOrderData()
        {
            string query = @"
                SELECT 
                    order_date, delivery_date, pickup_point_id, user_id, receive_code, status_id
                FROM orders 
                WHERE order_id = @id";

            using (var cmd = new MySqlCommand(query, _connection))
            {
                cmd.Parameters.AddWithValue("@id", _orderId);

                using (var reader = cmd.ExecuteReader())
                {
                    if (reader.Read())
                    {
                        dtpOrderDate.Value = Convert.ToDateTime(reader["order_date"]);
                        dtpDeliveryDate.Value = Convert.ToDateTime(reader["delivery_date"]);
                        txtReceiveCode.Text = reader["receive_code"].ToString();

                        SetComboBoxValue(cmbPickupPoint, reader["pickup_point_id"]);
                        SetComboBoxValue(cmbUser, reader["user_id"]);
                        SetComboBoxValue(cmbStatus, reader["status_id"]);
                    }
                    else
                    {
                        MessageBox.Show("Заказ не найден.", "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        DialogResult = DialogResult.Cancel;
                        Close();
                    }
                }
            }
        }

        private void SetComboBoxValue(ComboBox combo, object value)
        {
            if (value != DBNull.Value && combo.DataSource != null)
            {
                foreach (DataRowView row in combo.Items)
                {
                    if (row[combo.ValueMember].Equals(value))
                    {
                        combo.SelectedItem = row;
                        return;
                    }
                }
            }
        }



        private void EditOrder_Load(object sender, EventArgs e)
        {

        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void button1_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;
            }

            string query = @"
                UPDATE orders 
                SET 
                    order_date = @order_date,
                    delivery_date = @delivery_date,
                    pickup_point_id = @pickup_point_id,
                    user_id = @user_id,
                    receive_code = @receive_code,
                    status_id = @status_id
                WHERE order_id = @id";

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

                cmd.ExecuteNonQuery();
            }

            MessageBox.Show("Заказ успешно обновлён.", "Успех", MessageBoxButtons.OK, MessageBoxIcon.Information);
            DialogResult = DialogResult.OK;
            Close();
        }
    }
}