public void changeAccountStatus(int id, int accountStatus) {
   Seller seller = sellerMapper.getSellerById(id);
   seller.setAccountStatus(accountStatus);
   sellerMapper.updateSeller(seller);
   if (accountStatus == AccountStatus.SUSPEND) { // 冻结账号,停售所有产品
     productService.changeProductsOfSeller(id, ProductStatus.Unsellable);
   } else if (accountStatus == AccountStatus.OK) {
     productService.changeProductsOfSeller(id, ProductStatus.Sellable);
   }
   emailService.sendEmailWhenAdminChangeAccountStatus(seller.getEmail());
 }
 public void updateSeller(Seller seller) {
   sellerMapper.updateSeller(seller);
 }