private void booksAddButton_Click(object sender, EventArgs e) { ratingNumeric.Minimum = 1; ratingNumeric.Maximum = 10; databaseController dbc = new databaseController(); int id_b = 0; string title = titleTextBox.Text; int total_pages = Convert.ToInt32(numOfPages.Value); int rating = Convert.ToInt32(ratingNumeric.Value); string publish_date = Convert.ToString(DateTime.Now.Date.ToString("MM/dd/yyyy")); string summary = Convert.ToString(summaryTextBox.Text); //getting location id in bookstab #region location_id string selectedLocation = locationBooksCombobox.SelectedItem.ToString();//exception needs to be handled selectedLocation = selectedLocation.Trim(); string[] LocationID = selectedLocation.Split('|'); selectedLocation = LocationID[1].Trim(); string postalcode = LocationID[2].Trim(); int id_l = Convert.ToInt32(LocationID[0].Trim()); #endregion //getting publisher id in books tab #region publisher_id string selectedPublisher = publishersBooksCombobox.SelectedItem.ToString();//exception needs to be handled selectedPublisher = selectedPublisher.Trim(); string[] PublisherID = selectedPublisher.Split('|'); selectedPublisher = PublisherID[1].Trim(); string description = PublisherID[2].Trim(); int id_p = Convert.ToInt32(PublisherID[0].Trim()); selectedPublisher = publishersNameTextBox.Text; description = publishersDescriptionRichTextBox.Text; #endregion Books b = new Books(id_b, title, summary, year, lost, genre_id); dbc.SaveBooks(b); //getting genre id #region genre_id string selectedGenre = genreBooksCombobox.SelectedItem.ToString();//exception needs to be handled selectedGenre = selectedGenre.Trim(); string[] GenreID = selectedGenre.Split('|'); selectedGenre = GenreID[1].Trim(); string g_description = GenreID[2].Trim(); int id_g = Convert.ToInt32(GenreID[0].Trim()); //selectedGenre = genresNametextBox.Text; //g_description = genresDescriptionrichTextBox.Text; #endregion //getting author id #region author_id string selectedAuthor = authorsBooksCombobox.SelectedItem.ToString();//exception needs to be handled selectedAuthor = selectedAuthor.Trim(); string[] AuthorID = selectedAuthor.Split('|'); selectedAuthor = AuthorID[1].Trim(); string surname = AuthorID[2].Trim(); string middlename = AuthorID[3].Trim(); int id_a = Convert.ToInt32(AuthorID[0].Trim()); #endregion //getting book_id #region book_id List <string> listOfBookss = new List <string>(); using (NpgsqlConnection con = new NpgsqlConnection("Server=hattie.db.elephantsql.com; User Id=oxbcwgvz;" + "Password=igpiilcYjHtSKKDcs3wuGd15RtjskDzP; Database=oxbcwgvz;")) { con.Open(); string query = "SELECT id_b FROM books WHERE(title='" + title + "' AND total_pages='" + total_pages + "' AND rating='" + rating + "' AND publisher_id='" + id_p + "' AND location_id='" + id_l + "')"; NpgsqlCommand com = new NpgsqlCommand(query, con); NpgsqlDataReader reader = com.ExecuteReader(); while (reader.Read()) { int id_bb = reader.GetInt32(0); listOfBookss.Add(id_bb + ""); } con.Close(); } string prvi = listOfBookss.ElementAt(0); int idbb = Convert.ToInt32(prvi); #endregion Book_Authors ba = new Book_Authors(idbb, id_a); dbc.SaveBooksAuthors(ba); Book_Genres bg = new Book_Genres(idbb, id_g); dbc.SaveBooksGenres(bg); bookslistBox.Items.Clear(); OutputBooks(); }