bilet5/MainForm.cs

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

namespace merkulov5
{
    public partial class MainForm : Form
    {
        private MySqlDataAdapter dataAdapter;
        private DataTable prodTable;
        private BindingSource bindingSource = new BindingSource();
        public MainForm()
        {
            InitializeComponent();
            LoadProdData();
            LoadSortOptions();
        }
        private void LoadProdData() // загрузка данных в дгв
        {
            try
            {
                DB db = new DB();
                using (MySqlConnection connection = db.getConnection())
                {
                    connection.Open();
                    string query = "SELECT * FROM Librarian";

                    dataAdapter = new MySqlDataAdapter(query, connection);
                    prodTable = new DataTable();
                    dataAdapter.Fill(prodTable);
                    dataGridViewProd.RowTemplate.Height = 60;
                    bindingSource.DataSource = prodTable;
                    dataGridViewProd.DataSource = bindingSource;
                    dataGridViewProd.AllowUserToAddRows = false;
                    dataGridViewProd.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells;
                    dataGridViewProd.ReadOnly = true; // настройки дгв

                }
            }
            catch (MySqlException ex)
            {
                MessageBox.Show("Ошибка при подключении к базе данных или выполнении запроса: " + ex.Message);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Произошла общая ошибка: " + ex.Message);
            }

        }

        private void MainForm_Load(object sender, EventArgs e)
        {

        }

        private async void btnAdd_Click(object sender, EventArgs e)
        {
            DB db = new DB();

            DataTable table = new DataTable();

            MySqlDataAdapter adapter = new MySqlDataAdapter();

            db.openConnection();

            MySqlCommand commandAdd = new MySqlCommand("INSERT INTO Librarian (Surname, Name, LastName, Password, Login)" + "VALUES (@Surname, @Name, @Last, @Pass, @Log);", db.getConnection());
            commandAdd.Parameters.AddWithValue("@Surname", textBoxSurname.Text);
            commandAdd.Parameters.AddWithValue("@Name", textBoxName.Text);
            commandAdd.Parameters.AddWithValue("@Last", textBoxLast.Text);
            commandAdd.Parameters.AddWithValue("@Pass", textBoxLogin.Text);
            commandAdd.Parameters.AddWithValue("@Log", textBoxPass.Text);
          

            int rowsAffected = await commandAdd.ExecuteNonQueryAsync();

            if (rowsAffected > 0)
            {
                MessageBox.Show("Библиотекарь добавлен.");
                LoadProdData();

            }
            else
            {
                MessageBox.Show("Ошибка при добавлении библиотекаря");
                db.closeConnection();
            }
        }

        private void dataGridViewProd_Click(object sender, EventArgs e)
        {
            Surname.Text = dataGridViewProd.CurrentRow.Cells[1].Value.ToString();
            Named.Text = dataGridViewProd.CurrentRow.Cells[2].Value.ToString();
            LastName.Text = dataGridViewProd.CurrentRow.Cells[3].Value.ToString();
            Log.Text = dataGridViewProd.CurrentRow.Cells[4].Value.ToString();
            Pass.Text = dataGridViewProd.CurrentRow.Cells[5].Value.ToString();
        }

        private void btnEdit_Click(object sender, EventArgs e)
        {
            DB db = new DB();

            DataTable table = new DataTable();

            MySqlDataAdapter adapter = new MySqlDataAdapter();

            db.openConnection();

            MySqlCommand commandEdit = new MySqlCommand(" UPDATE Librarian SET Surname = @Surname, Name = @Name, LastName = @Last, Login = @Login, Password = @Password WHERE idLibrarian = @id;", db.getConnection());
            commandEdit.Parameters.AddWithValue("@id", Convert.ToInt32(dataGridViewProd.CurrentRow.Cells[0].Value));
            commandEdit.Parameters.AddWithValue("@Surname", Surname.Text);
            commandEdit.Parameters.AddWithValue("@Name", Named.Text);
            commandEdit.Parameters.AddWithValue("@Last", LastName.Text);
            commandEdit.Parameters.AddWithValue("@Login", Log.Text);
            commandEdit.Parameters.AddWithValue("@Password", Pass.Text);
  

            int rowsAffected = commandEdit.ExecuteNonQuery();

            if (rowsAffected > 0)
            {
                MessageBox.Show("Библиотекарь отредактирован.");
                LoadProdData();

            }
            else
            {
                MessageBox.Show("Редактирование не удалось");
                db.closeConnection();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            DB db = new DB();

            DataTable table = new DataTable();

            MySqlDataAdapter adapter = new MySqlDataAdapter();

            db.openConnection();

            MySqlCommand commandDelete = new MySqlCommand("Delete FROM Librarian WHERE idLibrarian = @id;", db.getConnection());
            commandDelete.Parameters.AddWithValue("@id", Convert.ToInt32(dataGridViewProd.CurrentRow.Cells[0].Value));
            

            int rowsAffected = commandDelete.ExecuteNonQuery();

            if (rowsAffected > 0)
            {
                MessageBox.Show("Библиотекарь удалена.");
                LoadProdData();
            }
            else
            {
                MessageBox.Show("Не удалось удалить библиотекаря");
                db.closeConnection();
            }
        }

        private void LoadSortOptions()
        {
            comboBoxSort.Items.Add("По умолчанию");
            comboBoxSort.Items.Add("Фамилия (а-я)");
            comboBoxSort.Items.Add("Фамилия (я-а)");
           
            comboBoxSort.SelectedIndex = 0;
        }

        private void comboBoxSort_SelectedIndexChanged(object sender, EventArgs e)
        {
            string sortOption = comboBoxSort.SelectedItem.ToString();

            switch (sortOption)
            {
                case "По умолчанию":
                    bindingSource.Sort = "";
                    break;
                case "Фамилия (а-я)":
                    bindingSource.Sort = "Surname ASC";
                    break;
                case "Фамилия (я-а)":
                    bindingSource.Sort = "Surname DESC";
                    break;
             
            }
        }
    }
}