Magento 1.7 Append Complex Data - magento

Question

I am trying to append a category id to a large number of SKUs in Magento 1.7. I have used the Import > Append Complex Data and, although it checked the file and ran ok, it did not add these SKUs to the category I wanted them in.
So, the objective is to leave all these SKUs in the categories there are in now but add an additional category.
Any help would be appreciated. Even if it is a different method entirely.

Answer 1

The fastest way to do this is to directly insert this as a SQL query using:
INSERT INTO `catalog_category_product` (
`category_id` ,
`product_id` ,
`position`
)
VALUES (
'4', '34', '0'
), (
'4', '35', '0'
);
In this case, it would add the category Id of 4 to the products with Id 34 and 35. You can create a small PHP script to dynamically create such a query from your file of SKUs and Category Ids.
Reindex after your query was successfully executed.
Alternatively, using the Magento eco-system and not the database, you can do this:
$categoryIds = array();
$toBeUpdatedProducts = array(4,6,7); // all the Ids you want to update
$newCategoryId = 65; // Id of new category
foreach ($toBeUpdatedProducts as $productId) {
$product = Mage::getModel('catalog/product')->load($productId);
$categoryIds = $product->getCategoryIds();
$categoryIds[] = $newCategoryId; // Add new category to existing ones
$product->setCategoryIds($categoryIds);
$product->save();
}