Update products programmatically in Magento

Question

I\'m working on a script that will create or update products in my catalog.
The script works fine when the product needs to be created, but it fails when the product alr

Answer 1

Easy with Magento API, also can use methods....

example

$data = array('qty'=>1, 'is_in_stock'=>1)

$stockModel = new Mage_CatalogInventory_Model_Stock_Item_Api;
$stockModel->update($product_id, $data);

Also can set Admin mode

Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);