InsertBookTask insertBookTask = new InsertBookTask( ctx );
UpdateBookRatingTask updateBookRatingTask = new UpdateBookRatingTask( ctx );
UpdateBookTotalSoldTask updateBookTotalSoldTask = new UpdateBookTotalSoldTask( ctx );
QueryBooksByAuthorTask queryBooksByAuthorTask = new QueryBooksByAuthorTask( ctx );
QueryBooksByAverageRatingTask queryBooksByAverageRatingTask = new QueryBooksByAverageRatingTask( ctx );
QueryBooksByBestRatingTask queryBooksByBestRatingTask = new QueryBooksByBestRatingTask( ctx );
QueryBooksByNewestPublishedTask queryBooksByNewestPublishedTask = new QueryBooksByNewestPublishedTask( ctx );
QueryBooksBySummaryTask queryBooksBySummaryTask = new QueryBooksBySummaryTask( ctx );
QueryBooksByTitleTask queryBooksByTitleTask = new QueryBooksByTitleTask( ctx );
QueryBooksByTotalSoldTask queryBooksByTotalSoldTask = new QueryBooksByTotalSoldTask( ctx );