how to get product attributes from wordpress database

Question

Writing custom code to create product detail page with wordpress database.

I have displayed product title, desc, price, stock, etc and got stuck up with product attributes. In the database, _product_attributes is stored in serialized manner in wp_postmeta table in database. And i couldn't unserailize attributes from it. But i found, each attribute value with it own price has been stored in wp_postmeta in some other post_id.

for example, product with post_id=55 has attribute name 'Size value' having values 14 and 18 and price 300 and 350, is displayed as attributes value and price in post_id=110,111

is there any formula behind? Any idea to find this product attribute value and corresponding price value?

Answer 1

I took a little bit of a different approach, I created a stored procedure in my database that will return all terms associated with a woocommerce product. I decided to go this route because i can call the procedure from my wordpress site and the desktop app I am creating without having to write the function in two different languages.

Though I'd post it here for others to use.

CREATE DEFINER=`database_name_here`@`%` PROCEDURE `get_product_attributes`(IN ProductName TEXT)
BEGIN
SELECT DISTINCT
     p.post_title AS 'Product Name',
     t.name AS 'Term Name',
     tt.taxonomy AS 'Term Type',
     tt.description AS 'Term Description'
FROM
     wp_posts AS p
INNER JOIN
     wp_term_relationships AS tr ON p.id = tr.object_id
INNER JOIN
     wp_term_taxonomy AS tt ON tt.term_taxonomy_id = tr.term_taxonomy_id
INNER JOIN
     wp_terms AS t ON t.term_id = tt.term_id
WHERE
     p.post_title= ProductName
AND
     p.post_type = 'product';
END

Answer 2

Product attributes are stored in two locations - in wp_terms, wp_term_taxonomy and wp_term_relationships (that's the first place - each attribute is preceded by pa_ for its taxonomy name - e.g. if you have a color attribute, it's under pa_color) then also as a PHP serialized array in wp_postmeta under '_product_attributes' meta_key.

You can find the method to construct the seriliazed attributes array here:

https://github.com/woothemes/woocommerce/blob/master/includes/class-wc-ajax.php

Look for function save_attributes() and add_attribute to see how the serialized array is constructed.

Update: Later versions of wooCommerce also have a serialized array in wp_options under the _transient_wc_attribute_taxonomies key and a new table called wp_woocommerce_attribute_taxonomies.