NNTelekom2/NN_TelekomPP/Forms/Services_customersADD.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 System.Data.SqlClient;

namespace NN_TelekomPP.Forms
{
    public partial class Services_customersADD : Form // улуги абонентов добавить 
    {
        DataBase dataBase = new DataBase();
        public Services_customersADD()
        {
            InitializeComponent();

        }

        private void Services_customersADD_Load(object sender, EventArgs e)
        {
            // comboBox1 - организации
            string searchString = $"Select Name From Organizations";
            SqlCommand com = new SqlCommand(searchString, dataBase.GetConnection());
            dataBase.openConnection();
            SqlDataReader read = com.ExecuteReader();
            while (read.Read())
            {
                comboBox1.Items.Add(read.GetString(0));
            }
            read.Close();
            dataBase.closeConnection();
            // comboBox2 - Интернет
            string searchString2 = $"Select Name From Internet";

            SqlCommand com2 = new SqlCommand(searchString2, dataBase.GetConnection());
            dataBase.openConnection();
            SqlDataReader read2 = com2.ExecuteReader();
            while (read2.Read())
            {
                comboBox2.Items.Add(read2.GetString(0));
            }
            read2.Close();
            dataBase.closeConnection();
            // comboBox3 - Абонентская плата
            

            string searchString3 = $"Select Name From SubscriptionFee";
            
          
            SqlCommand com3 = new SqlCommand(searchString3, dataBase.GetConnection());
            dataBase.openConnection();
            SqlDataReader read3 = com3.ExecuteReader();
            while (read3.Read())
            {
                comboBox3.Items.Add(read3.GetString(0));
            }
            read3.Close();
            dataBase.closeConnection();
            
        }

        private void button_back_Click(object sender, EventArgs e)
        {
            this.Hide();
            Services_customers M = new Services_customers();
            M.ShowDialog();
        }
        
        private void Save_button_Click(object sender, EventArgs e) // сохранение 
        {

            var num = $"select Organizations_code from Organizations where Name = '{comboBox1.Text}'";
            var internet = $"select Internet_code from Internet where Name = '{comboBox2.Text}'";
            var Fee = $"select AP_code from SubscriptionFee where Name = '{comboBox3.Text}'";
            
            SqlDataAdapter sda = new SqlDataAdapter(num, dataBase.GetConnection());
            SqlDataAdapter sda2 = new SqlDataAdapter(internet, dataBase.GetConnection());
            SqlDataAdapter sda3 = new SqlDataAdapter(Fee, dataBase.GetConnection());
            DataTable dtbl = new DataTable();
            sda.Fill(dtbl);




            if (comboBox1.Text.Replace(" ", "") == "") MessageBox.Show("Поле организация не может быть пустым");
            else if (comboBox2.Text.Replace(" ", "") == "") MessageBox.Show("Поле  интернет не может быть пустым");
            else if (comboBox3.Text.Replace(" ", "") == "") MessageBox.Show("Поле  абонентский пакет не может быть пустым");
            
            else
            {

                dataBase.openConnection();
                
                SqlCommand sqlCommand_org = new SqlCommand(num, dataBase.GetConnection());
                SqlCommand sqlCommand_org2 = new SqlCommand(internet, dataBase.GetConnection());
                SqlCommand sqlCommand_org3 = new SqlCommand(Fee, dataBase.GetConnection());
                
                var id_org = sqlCommand_org.ExecuteScalar().ToString();
                var inter = sqlCommand_org2.ExecuteScalar().ToString();
                var AP1 = sqlCommand_org3.ExecuteScalar().ToString();
                // Проверка есть ли у данной организации уже интернет 
                string a = $"select count(*)  from Services_customers  join  Organizations on Services_customers.Organizations_code = Organizations.Organizations_code   where Organizations.Organizations_code='{id_org}' ";
                SqlCommand command1 = new SqlCommand(a,dataBase.GetConnection());
                if (command1.ExecuteScalar().ToString().Equals("1"))
                {
                    MessageBox.Show("Данная организация уже есть в таблице");
                    return;
                }
                


                var addQuery = $"insert into Services_customers (Organizations_code, Internet_code, AP_code ) values ('{id_org}','{inter}', '{AP1}' )";
                    var command = new SqlCommand(addQuery, dataBase.GetConnection());
                    command.ExecuteNonQuery();
                    MessageBox.Show("Запись успешно добавлена в таблицу");
                    dataBase.closeConnection();
              
            }
        }

        private void global_FormClosed(object sender, FormClosedEventArgs e)
        {
            Application.Exit();
        }
    }
}