存储在哪里WooCommerce产品属性数据库中的术语值

Question

Woocommerce is storing the value of many product attributes as an empty string.

Here is an example of what shows up in the database for _product_attributes:

a:1:{s:5:"brand";a:6:{s:4:"name";s:5:"brand";s:5:"value";s:0:"";s:11:"is_taxonomy";i:1;s:8:"position";i:0;s:10:"is_visible";i:1;s:12:"is_variation";i:0;}}

I have properly added product attributes in the product data section in wordpress. I have not edited the php code at all. How do I get it to actually store the right product attribute values?

Answer 1

The product attribute values are not stored in wp_post_meta table, but in wp_term_relationships .

Also when looking to your serialized data, there is something weird: All product attributes taxonomy always start with pa_ like in this example:

a:1:{s:8:"pa_color";a:6:{s:4:"name";s:8:"pa_color";s:5:"value";s:0:"";s:8:"position";i:0;s:10:"is_visible";i:0;s:12:"is_variation";i:1;s:11:"is_taxonomy";i:1;}}

To get the values from a dynamic product Id for a given brand taxonomy, you can use:

$taxonomy = 'brand';
$terms = wp_get_post_terms( $product_id, $taxonomy );

// Loop through WP_Term objects
foreach ( $terms as $term ) {
    $term_id   = $term->term_id;
    $term_name = $term->name;
    $term_slug = $term->slug;
}

Or with an SQL query using WPDB class (from a dynamic product ID) :

global $wpdb;

$taxonomy   = 'brand'; // The taxonomy
$product_id = 37; // The product ID

$terms = $wpdb->get_results( $wpdb->prepare("
    SELECT t.term_id, t.name, t.slug
    FROM {$wpdb->prefix}terms t
    INNER JOIN {$wpdb->prefix}term_taxonomy tt
        ON t.term_id = tt.term_id
    INNER JOIN {$wpdb->prefix}term_relationships tr
        ON tt.term_taxonomy_id = tr.term_taxonomy_id
    WHERE tt.taxonomy = '%s'
    AND tr.object_id = %d
", $taxonomy, $product_id ) );

// Raw output
var_dump($terms);

So as you can see the SQL query uses wp_terms , wp_term_taxonomy and wp_term_relationships . The product ID is queried through wp_term_relationships table on object_id column.