Magento mass-assign products to category

Question

As the title says,i need to mass-assign products to a category and from the admin i can only edit one product at a time; i dont know why it just doesnt work to mass add them

Answer 1

I managed to resolve the problem with the following code :

$write = Mage::getSingleton('core/resource')->getConnection('core_write');
$x = 1171;
$y = 2000;
$categoryID = 4;
$productPosition = 0;
while($x <= $y) {
$write->query("REPLACE INTO `catalog_category_product` (`category_id`, `product_id`,  `position`) VALUES ($categoryID, $x++, $productPosition)");
}
echo "The job is done";
?>

I hope the code is clear for everyone,if it's not,reply and i'll try to explain it.

@nachito : here it is.