Updating product qty in Magento in an easier & faster way

Introduction

Product Qty can be updated via default import profile though but this is very slow and requires lots of CSV fields(besides SKU & qty) for updating.
Today I am going to talk about updating product qty just by using CSV with two fields: SKU & qty(new) which is very fast enough even for thousands of products.

Steps:

1> Prepare CSV file(stocks.csv) with two fields: SKU & qty and upload in the root of Magento installation.
You can see the snapshot of how it should look like:

2> Create a file: update_stocks.php in the root of Magento installation and paste the following code:

<?php
/**
 * @author		MagePsycho <[email protected]>
 * @website		https://www.magepsycho.com
 * @category	Export / Import
 */
$mageFilename = 'app/Mage.php';
require_once $mageFilename;
Mage::setIsDeveloperMode(true);
ini_set('display_errors', 1);
umask(0);
Mage::app('admin');
Mage::register('isSecureArea', 1);
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

set_time_limit(0);
ini_set('memory_limit','1024M');

/***************** UTILITY FUNCTIONS ********************/
function _getConnection($type = 'core_read'){
	return Mage::getSingleton('core/resource')->getConnection($type);
}

function _getTableName($tableName){
	return Mage::getSingleton('core/resource')->getTableName($tableName);
}

function _getAttributeId($attribute_code = 'price'){
	$connection = _getConnection('core_read');
	$sql = "SELECT attribute_id
				FROM " . _getTableName('eav_attribute') . "
			WHERE
				entity_type_id = ?
				AND attribute_code = ?";
	$entity_type_id = _getEntityTypeId();
	return $connection->fetchOne($sql, array($entity_type_id, $attribute_code));
}

function _getEntityTypeId($entity_type_code = 'catalog_product'){
	$connection = _getConnection('core_read');
	$sql		= "SELECT entity_type_id FROM " . _getTableName('eav_entity_type') . " WHERE entity_type_code = ?";
	return $connection->fetchOne($sql, array($entity_type_code));
}

function _checkIfSkuExists($sku){
	$connection = _getConnection('core_read');
	$sql		= "SELECT COUNT(*) AS count_no FROM " . _getTableName('catalog_product_entity') . "	WHERE sku = ?";
	$count		= $connection->fetchOne($sql, array($sku));
	if($count > 0){
		return true;
	}else{
		return false;
	}
}

function _getIdFromSku($sku){
	$connection = _getConnection('core_read');
	$sql		= "SELECT entity_id FROM " . _getTableName('catalog_product_entity') . " WHERE sku = ?";
	return $connection->fetchOne($sql, array($sku));
}

function _updateStocks($data){
	$connection		= _getConnection('core_write');
	$sku			= $data[0];
	$newQty			= $data[1];
	$productId		= _getIdFromSku($sku);
	$attributeId	= _getAttributeId();

	$sql			= "UPDATE " . _getTableName('cataloginventory_stock_item') . " csi,
					   " . _getTableName('cataloginventory_stock_status') . " css
	                   SET
					   csi.qty = ?,
					   csi.is_in_stock = ?,
	                   css.qty = ?,
					   css.stock_status = ?
					   WHERE
					   csi.product_id = ?
			           AND csi.product_id = css.product_id";
	$isInStock		= $newQty > 0 ? 1 : 0;
	$stockStatus	= $newQty > 0 ? 1 : 0;
	$connection->query($sql, array($newQty, $isInStock, $newQty, $stockStatus, $productId));
}
/***************** UTILITY FUNCTIONS ********************/

$csv				= new Varien_File_Csv();
$data				= $csv->getData('stocks.csv'); //path to csv
array_shift($data);

$message = '';
$count   = 1;
foreach($data as $_data){
	if(_checkIfSkuExists($_data[0])){
		try{
			_updateStocks($_data);
			$message .= $count . '> Success:: Qty (' . $_data[1] . ') of Sku (' . $_data[0] . ') has been updated. <br />';

		}catch(Exception $e){
			$message .=  $count .'> Error:: while Upating  Qty (' . $_data[1] . ') of Sku (' . $_data[0] . ') => '.$e->getMessage().'<br />';
		}
	}else{
		$message .=  $count .'> Error:: Product with Sku (' . $_data[0] . ') does\'t exist.<br />';
	}
	$count++;
}
echo $message;

3> Open your browser and run the following URL:

• http://your-magento-url/update_stocks.php

You will see how fast the qty of corresponding SKUs are updated.

Thanks for reading guys!!

Happy Importing!!