uuuu/demo26052026/Form4.cs

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;
using Npgsql;

namespace demo26052026
{
    public partial class Form4 : Form
    {
        static string ConnString = "Server=localhost;Port=5432;Database=newdemo262;Username=postgres;Password=Swa2sWA13;";
        int IDZobsch { get; set; }
        public Form4(int IDZ)
        {
            InitializeComponent();
            IDZobsch = IDZ;

            NpgsqlConnection npgsqlConnection = new NpgsqlConnection(ConnString);
            npgsqlConnection.Open();
            NpgsqlCommand npgsqlCommand = new NpgsqlCommand($@"SELECT ""Data_Z"", ""Data_P"", ""Adress_ID"", ""Status"", ""ID_Zakaza"" FROM public.""Zakaz"";", npgsqlConnection);
            DataTable dataTable = new DataTable();
            dataTable.Load(npgsqlCommand.ExecuteReader());
            npgsqlConnection.Close();
            maskedTextBox1.Text = dataTable.Rows[0].ItemArray[0].ToString();
            maskedTextBox2.Text = dataTable.Rows[0].ItemArray[1].ToString();
            comboBox1.SelectedIndex = int.Parse(dataTable.Rows[0].ItemArray[2].ToString());
            comboBox2.SelectedIndex = int.Parse(dataTable.Rows[0].ItemArray[3].ToString());



            NpgsqlConnection npgsqlConnection2 = new NpgsqlConnection(ConnString);
                npgsqlConnection2.Open();
                NpgsqlCommand npgsqlCommand2 = new NpgsqlCommand($@"SELECT (SELECT ""Articul"" FROM public.""Tovar"" WHERE ""ID_Tovar"" =""Tovar_ID""), ""Kolichestvo"" FROM public.""Sostav"" WHERE ""Zakaz_ID"" = {dataTable.Rows[0].ItemArray[4].ToString()};", npgsqlConnection2);
                DataTable dataTable2 = new DataTable();
                dataTable2.Load(npgsqlCommand2.ExecuteReader());
                npgsqlConnection2.Close();
                for (int j = 0; j < dataTable2.Rows.Count; j++)
                {
                    listBox1.Items.Add(dataTable2.Rows[j].ItemArray[0].ToString() + " " + dataTable2.Rows[j].ItemArray[1].ToString());
                }
                
                
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            listBox1.Items.Add( comboBox3.SelectedItem + " " + numericUpDown1.Value);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.Hide();
            Form3 form3 = new Form3();
            form3.ShowDialog();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (IDZobsch == 0)
            {
                NpgsqlConnection npgsqlConnection = new NpgsqlConnection(ConnString);
                npgsqlConnection.Open();
                NpgsqlCommand npgsqlCommand = new NpgsqlCommand($@"INSERT INTO public.""Zakaz""(""Data_Z"", ""Data_P"", ""Adress_ID"", ""Status"") VALUES ('{maskedTextBox1.Text}', '{maskedTextBox2.Text}', {comboBox1.SelectedIndex + 1}, {comboBox2.SelectedIndex + 1}) RETURNING ""ID_Zakaza"";", npgsqlConnection);

                DataTable dataTable = new DataTable();
                dataTable.Load(npgsqlCommand.ExecuteReader());
                int IDZakaz = int.Parse(dataTable.Rows[0].ItemArray[0].ToString());
                npgsqlConnection.Close();

                int[] IDMnoga = new int[listBox1.Items.Count];
                for (int i = 0; i < listBox1.Items.Count; i++)
                {
                    string rabota = listBox1.Items[i].ToString();
                    string[] razdeli = rabota.Split(' ');



                    NpgsqlConnection npgsqlConnection2 = new NpgsqlConnection(ConnString);
                    npgsqlConnection2.Open();
                    NpgsqlCommand npgsqlCommand2 = new NpgsqlCommand($@"INSERT INTO public.""Sostav""(""Zakaz_ID"", ""Tovar_ID"", ""Kolichestvo"") VALUES ({IDZakaz}, (SELECT ""ID_Tovar"" FROM public.""Tovar"" WHERE ""Articul"" = '{razdeli[0]}'), {razdeli[1]}) RETURNING ""ID_Sostav"";", npgsqlConnection2);

                    DataTable dataTable2 = new DataTable();
                    dataTable2.Load(npgsqlCommand2.ExecuteReader());
                    int IDZakaz2 = int.Parse(dataTable2.Rows[0].ItemArray[0].ToString());
                    IDMnoga[i] = IDZakaz2;
                    npgsqlConnection2.Close();
                }
            }
            else
            {
                NpgsqlConnection npgsqlConnection = new NpgsqlConnection(ConnString);
                npgsqlConnection.Open();
                NpgsqlCommand npgsqlCommand = new NpgsqlCommand($@"UPDATE public.""Zakaz"" SET ""Data_Z""= '{maskedTextBox1.Text}', ""Data_P""= '{maskedTextBox2.Text}', ""Adress_ID""= {comboBox1.SelectedIndex + 1}, ""Status""= {comboBox2.SelectedIndex + 1} WHERE ""ID_Zakaza""= {IDZobsch};", npgsqlConnection);

                npgsqlCommand.ExecuteNonQuery();
                npgsqlConnection.Close();

                NpgsqlConnection npgsqlConnection3 = new NpgsqlConnection(ConnString);
                npgsqlConnection3.Open();
                NpgsqlCommand npgsqlCommand3 = new NpgsqlCommand($@"DELETE FROM public.""Sostav"" WHERE ""Zakaz_ID"" = {IDZobsch};", npgsqlConnection3);

                npgsqlCommand3.ExecuteNonQuery();
                npgsqlConnection3.Close();

                for (int i = 0; i < listBox1.Items.Count; i++)
                {
                    string rabota = listBox1.Items[i].ToString();
                    string[] razdeli = rabota.Split(' ');
                    NpgsqlConnection npgsqlConnection2 = new NpgsqlConnection(ConnString);
                    npgsqlConnection2.Open();
                    NpgsqlCommand npgsqlCommand2 = new NpgsqlCommand($@"INSERT INTO public.""Sostav""(""Zakaz_ID"", ""Tovar_ID"", ""Kolichestvo"") VALUES ({IDZobsch}, (SELECT ""ID_Tovar"" FROM public.""Tovar"" WHERE ""Articul"" = '{razdeli[0]}'), {razdeli[1]}) RETURNING ""ID_Sostav"";", npgsqlConnection2);

                    DataTable dataTable2 = new DataTable();
                    dataTable2.Load(npgsqlCommand2.ExecuteReader());
                    int IDZakaz2 = int.Parse(dataTable2.Rows[0].ItemArray[0].ToString());
                    npgsqlConnection2.Close();
                }
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            listBox1.Items.RemoveAt(listBox1.SelectedIndex);
        }

        private void button5_Click(object sender, EventArgs e)
        {
            NpgsqlConnection npgsqlConnection3 = new NpgsqlConnection(ConnString);
            npgsqlConnection3.Open();
            NpgsqlCommand npgsqlCommand3 = new NpgsqlCommand($@"DELETE FROM public.""Zakaz"" WHERE ""ID_Zakaza"" =  {IDZobsch};", npgsqlConnection3);

            npgsqlCommand3.ExecuteNonQuery();
            npgsqlConnection3.Close();
        }
    }
}