public CategoriesBooksAuthorsDTO GetAllTables()
        {
            CategoriesBooksAuthorsDTO categoriesBooksAvtors = new CategoriesBooksAuthorsDTO();

            categoriesBooksAvtors.Books      = _booksContext.Books.ToList();
            categoriesBooksAvtors.Authors    = _booksContext.Avtors.ToList();
            categoriesBooksAvtors.Categories = _booksContext.Categories.ToList();
            categoriesBooksAvtors.Comments   = _booksContext.Comments.ToList();

            return(categoriesBooksAvtors);
        }
        public CategoriesBooksAuthorsDTO GetAllTables()
        {
            var categoriesBooksAuthors = new CategoriesBooksAuthorsDTO();
            var sql =
                @"
                    select * from Books 
                    select * from Avtors 
                    select * from Comments 
                    select * from categories";

            using (SqlMapper.GridReader multi = _connectionString.QueryMultiple(sql))
            {
                categoriesBooksAuthors.Books      = multi.Read <Book>().ToList();
                categoriesBooksAuthors.Authors    = multi.Read <Author>().ToList();
                categoriesBooksAuthors.Categories = multi.Read <Category>().ToList();
                categoriesBooksAuthors.Comments   = multi.Read <Comment>().ToList();
            }

            return(categoriesBooksAuthors);
        }