public static function saveToSupplier(Supplier $spp)
 {
     $conn = cont\connection::getConnectionObject();
     $con = $conn->getConnection();
     $sql = $con->prepare("INSERT INTO Supplier VALUES (?,?,?,? )");
     $supplierId = $spp->getSupplierId();
     $name = $spp->getName();
     $contactNo = $spp->getContactNo();
     $Nic = $spp->getNic();
     $sql->bind_param("ssss", $supplierId, $name, $contactNo, $Nic);
     if ($sql->execute() == TRUE) {
         echo "New record created successfully";
         return true;
     } else {
         echo "not working";
         echo "Error: " . $sql . "<br>";
         return false;
     }
 }