access woocommerce table data but how

<?php
   $wpdb->insert($wpdb->usermeta, array("user_id" => 1, "meta_key" => "awesome_factor", "meta_value" => 10), array("%d", %s", "%d"));

   // Equivalent to:
   // INSERT INTO wp_usermeta (user_id, meta_key, meta_value) VALUES (1, "awesome_factor", 10);
?>