public int updateCategory(CategoryDTO category)
 {
     CategoryDAO dao = new CategoryDAO();
     return dao.updateCategory(category);
 }
 public CategoryDTO getCategoryById(int categoryId)
 {
     CategoryDAO dao = new CategoryDAO();
     return dao.getCategoryById(categoryId);
 }
 public int insertCategory(CategoryDTO category)
 {
     CategoryDAO dao = new CategoryDAO();
     return dao.insertCategory(category);
 }
 public int deleteCategory(CategoryDTO category)
 {
     CategoryDAO dao = new CategoryDAO();
     return dao.deleteCategory(category);
 }