This my code:

$albums = $wpdb->get_results( "SELECT id, name FROM $wpdb->wppa_albums", ARRAY_A );

It produces 2 warnings:
– Use of a direct database call is discouraged.
– Direct database call without caching detected. Consider using wp_cache_get() / wp_cache_set() or wp_cache_delete().

What should i do with these messages? I have no idea how wp_cache_get() can be used here.

Note: My plugin wp-photo-album-plus creates and maintains various own db tables, like wppa_albums

How to fix the warning