How do categories and subcategories for WooCommerce are saved in DB?

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I have a problem with categories and subcategories in WordPress plugin – WooCommerce.
I’m creating a script which would create a categories and subcategories, the problem is that I don’t fully understand how all this works in WooCommerce DB structure.

That’s what I was able to do:

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In “wp_terms”: 

term_id | name              | slug     | term group
20      | Parent category   | parent   | 0
21      | Children category | children | 0

In “wp_term_taxonomy”: 

term_taxonomy_id | term_id | taxonomy    | description | parent | count
1                | 20      | product_cat |             | 0      | 0
2                | 21      | product_cat |             | 20     | 0

And that’s working, but why the hell this don’t:

In “wp_term_taxonomy”: 

term_taxonomy_id | term_id | taxonomy    | description | parent | count
1                | 20      | product_cat |             | 21     | 0
2                | 21      | product_cat |             | 0      | 0
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5 comments 

  1. function getParentCategories() {
    global $wpdb;
    $sql = "SELECT term_id as id, name, slug FROM wp_terms where term_id in (SELECT term_id FROM wp_term_taxonomy where parent = 0 and taxonomy = 'category') order by name asc";
    $parents = $wpdb->get_results( $sql );
    return $parents;
}

function getChildCategories($id) {
    global $wpdb;
    $sql = "SELECT term_id as id, name, slug FROM wp_terms where term_id in (SELECT term_id FROM wp_term_taxonomy where parent = $id and taxonomy = 'category')  order by name asc";
    $children = $wpdb->get_results( $sql );
    return $children;
}

  5. Once I had a problem: Subcategories were not displayed, despite the fact that both databases were filled correctly.
    The following helped:

    • Delete the value of the product_cat_children field in the wp_options table
    • Update key values via admin panel in WooCommerce

    This will update the value of the product_cat_children field.

    Everything worked.