PhotoStudio_PM_04/ServiceForm.cs

using System;
using System.Data;
using System.Windows.Forms;
using Npgsql;

namespace PhotoStudioApp
{
    public partial class ServiceForm : Form
    {
        private string _connectionString;

        public ServiceForm(string connectionString)
        {
            InitializeComponent();
            _connectionString = connectionString;
            LoadServices();
        }

        private void LoadServices()
        {
            using (NpgsqlConnection conn = new NpgsqlConnection(_connectionString))
            {
                conn.Open();
                string sql = "select service_id, service_name, service_type, price from services";
                NpgsqlDataAdapter adapter = new NpgsqlDataAdapter(sql, conn);
                DataTable dt = new DataTable();
                adapter.Fill(dt);

                // Скрываем service_id
                dgvServices.DataSource = dt;
                if (dgvServices.Columns.Contains("service_id"))
                {
                    dgvServices.Columns["service_id"].Visible = false;
                }
            }
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            // Простая форма для добавления
            string name = Microsoft.VisualBasic.Interaction.InputBox("Введите название услуги", "Добавление");
            if (!string.IsNullOrEmpty(name))
            {
                string type = Microsoft.VisualBasic.Interaction.InputBox("Введите тип услуги (photo, video, event)", "Добавление");
                string priceStr = Microsoft.VisualBasic.Interaction.InputBox("Введите стоимость", "Добавление");

                if (decimal.TryParse(priceStr, out decimal price))
                {
                    using (NpgsqlConnection conn = new NpgsqlConnection(_connectionString))
                    {
                        conn.Open();
                        string sql = "insert into services (service_name, service_type, price) values (@name, @type, @price)";
                        NpgsqlCommand cmd = new NpgsqlCommand(sql, conn);
                        cmd.Parameters.AddWithValue("@name", name);
                        cmd.Parameters.AddWithValue("@type", type);
                        cmd.Parameters.AddWithValue("@price", price);
                        cmd.ExecuteNonQuery();
                        MessageBox.Show("Услуга добавлена");
                        LoadServices();
                    }
                }
                else
                {
                    MessageBox.Show("Некорректная стоимость");
                }
            }
        }

        private void btnEdit_Click(object sender, EventArgs e)
        {
            if (dgvServices.SelectedRows.Count > 0)
            {
                DataRowView rowView = dgvServices.SelectedRows[0].DataBoundItem as DataRowView;
                if (rowView != null)
                {
                    int serviceId = (int)rowView["service_id"];
                    string currentName = rowView["service_name"].ToString();
                    string currentType = rowView["service_type"].ToString();
                    string currentPrice = rowView["price"].ToString();

                    string name = Microsoft.VisualBasic.Interaction.InputBox("Название услуги", "Редактирование", currentName);
                    string type = Microsoft.VisualBasic.Interaction.InputBox("Тип услуги", "Редактирование", currentType);
                    string priceStr = Microsoft.VisualBasic.Interaction.InputBox("Стоимость", "Редактирование", currentPrice);

                    if (decimal.TryParse(priceStr, out decimal price))
                    {
                        using (NpgsqlConnection conn = new NpgsqlConnection(_connectionString))
                        {
                            conn.Open();
                            string sql = "update services set service_name = @name, service_type = @type, price = @price where service_id = @serviceId";
                            NpgsqlCommand cmd = new NpgsqlCommand(sql, conn);
                            cmd.Parameters.AddWithValue("@name", name);
                            cmd.Parameters.AddWithValue("@type", type);
                            cmd.Parameters.AddWithValue("@price", price);
                            cmd.Parameters.AddWithValue("@serviceId", serviceId);
                            cmd.ExecuteNonQuery();
                            MessageBox.Show("Услуга обновлена");
                            LoadServices();
                        }
                    }
                    else
                    {
                        MessageBox.Show("Некорректная стоимость");
                    }
                }
            }
            else
            {
                MessageBox.Show("Выберите услугу для редактирования");
            }
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            if (dgvServices.SelectedRows.Count > 0)
            {
                DataRowView rowView = dgvServices.SelectedRows[0].DataBoundItem as DataRowView;
                if (rowView != null)
                {
                    int serviceId = (int)rowView["service_id"];
                    if (MessageBox.Show("Удалить услугу?", "Подтверждение", MessageBoxButtons.YesNo) == DialogResult.Yes)
                    {
                        using (NpgsqlConnection conn = new NpgsqlConnection(_connectionString))
                        {
                            conn.Open();
                            string sql = "delete from services where service_id = @serviceId";
                            NpgsqlCommand cmd = new NpgsqlCommand(sql, conn);
                            cmd.Parameters.AddWithValue("@serviceId", serviceId);
                            cmd.ExecuteNonQuery();
                            MessageBox.Show("Услуга удалена");
                            LoadServices();
                        }
                    }
                }
            }
            else
            {
                MessageBox.Show("Выберите услугу для удаления");
            }
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}