Bulk update product stock quantities from CSV in Magento

Magento
// PHP

What it does

Batch update your stock levels from a two-column CSV file in Magento.

The CSV file should have the SKU in the first column and the new stock level in the second column, with no headers.

For example:

6930847831857 51
SHIRT BLACK S 17
SHIRT RED S 0
6968281346879 106
1538005494092 88

The Code

/**
 * @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));
}

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

How To Use It

  1. Save the CSV file as stockUpdate.csv and upload it to yourdomain.com/stockUpdate.csv
  2. Create the file with the PHP code above, save it as newStocks.php and upload it to yourdomain.com/newStocks.php
  3. Visit yourdomain.com/newStocks.php in your browser to run the script

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