Magento - SQL - Select all products by attribute and update it - sql

Question

I need to select all products with specific attribute (barcolor) and then update attribute with another value.
EXAMPLE.
I would like to select all SKU with barcolor = LIGHT GREEN and update them to GREEN.
Thanks!

Answer 1

you can do this from backend. you can go to catalog > manage products > select all products > at the right side you can see update attributes option , select that and click on submit and you will redirect to another page and than give the value in required field and save it.

Answer 2

It can be achieve by programming also.
If you have attribute option ID than:
$sAttributeName = 'brands';
$mOptionValueId = 250; // 250 is Id of Brand 1
$newOptionValueId = 255; // 255 is Id of Brand 2
$productsCollection = Mage::getModel('catalog/product')->getCollection()
->addAttributeToSelect('*')
->addFieldToFilter(
$sAttributeName,
array(
'eq' => $mOptionValueId
)
);
$storeId = Mage::app()->getStore()->getStoreId();
foreach($productsCollection as $product) {
$productId = $product->getId();
Mage::getSingleton('catalog/product_action')->updateAttributes(
array($productId),
array('brands' => $newOptionValueId),
$storeId
);
}
If you do not have attribute option ID than you can use the option value directly as:
$sAttributeName = 'brands';
$mOptionValue = 'Brand 1';
$newOptionValue = 'Brand 2';
$productsCollection = Mage::getModel('catalog/product')->getCollection()
->addAttributeToSelect('*')
->addFieldToFilter(
$sAttributeName,
array(
'eq' => Mage::getResourceModel('catalog/product')
->getAttribute($sAttributeName)
->getSource()
->getOptionId($mOptionValue)
)
);
$storeId = Mage::app()->getStore()->getStoreId();
foreach($productsCollection as $product) {
$productId = $product->getId();
Mage::getSingleton('catalog/product_action')->updateAttributes(
array($productId),
array('brands' => Mage::getResourceModel('catalog/product')
->getAttribute($sAttributeName)
->getSource()
->getOptionId($newOptionValue)),
$storeId
);
}

Answer 3

If you have the list of the entity_ids for all the products and you are using a custom attribute, you can run an SQL query for each and every product like so:
UPDATE `catalog_product_entity_varchar` SET value = 'NEW BLACK' WHERE entity_id = '12345' AND attribute_id = 'attribute_id_here';
You can also filter the fields by:
SELECT entity_id,value FROM catalog_product_entity_varchar WHERE value LIKE 'something';