private void booksDeleteButton_Click(object sender, EventArgs e) { if (bookslistBox.SelectedItem == null) { MessageBox.Show("Nobena knjiga ni izbrana."); } else { databaseController dbc = new databaseController(); string selectedBook = bookslistBox.SelectedItem.ToString();//exception needs to be handled selectedBook = selectedBook.Trim(); string[] BookID = selectedBook.Split('|'); int id_b = Convert.ToInt32(BookID[0].Trim()); selectedBook = BookID[1].Trim();//title string author_name = BookID[2].Trim(); string author_surname = BookID[3].Trim(); int lost = Convert.ToInt32(BookID[4].Trim()); string year = BookID[5].Trim(); string location_name = BookID[6].Trim(); string publisher_name = BookID[7].Trim(); string genre_genretype = BookID[8].Trim(); int id_g = 0; Authors aid = new Authors(0, author_name, author_surname); dbc.idAuthors(aid); int author_id = 0; foreach (int k in dbc.idAuthors(aid)) { author_id = k; } Locations lid = new Locations(0, location_name, ""); dbc.idLocations(lid); int location_id = 0; foreach (int k in dbc.idLocations(lid)) { location_id = k; } Publishers pid = new Publishers(0, publisher_name); dbc.idPublishers(pid); int publisher_id = 0; foreach (int k in dbc.idPublishers(pid)) { publisher_id = k; } Genres gid = new Genres(0, genre_genretype); dbc.idGenres(gid); int genre_id = 0; foreach (int k in dbc.idGenres(gid)) { genre_id = k; } Books b = new Books(id_b, selectedBook, "", year, lost, genre_id, publisher_id, location_id); #region author_id Book_Authors id = new Book_Authors(0, id_b); dbc.ReadAuthorsID(id); int id_a = 0; foreach (int k in dbc.ReadAuthorsID(id)) { id_a = k; } /*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(); * int id_a = Convert.ToInt32(AuthorID[0].Trim());*/ #endregion Book_Authors ba = new Book_Authors(author_id, id_b); //MessageBox.Show("author"+Convert.ToString(author_id), "book" + Convert.ToString(id_b)); dbc.DeleteBooksAuthors(ba); dbc.DeleteBooks(b); bookslistBox.Items.Clear(); OutputBooks(); userUnLendedBookslistBox.Items.Clear(); userLendedBookslistBox.Items.Clear(); //OutputBooksOnRents_Lended(); OutputBooksOnRents_UnLended(); } }