Get posts by list of post IDs ordered by those IDs?

You could use post__in as a parameter in your WP_Query, like:

$favourite_posts = new WP_Query(
    array( 
        'post__in' => array( 111, 222, 333 ),
        'orderby' => 'ID'
    ) 
);

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)