source: wpshell/module-wpdb.php

<?php

class wpdbshell {
        function get_results($query) {
                global $wpdb; 
                return call_user_func_array( array( $wpdb, 'get_results' ), $query );
        }

        function get_var($query) {
                global $wpdb; 
                return call_user_func_array( array( $wpdb, 'get_var' ), $query );
        }

        function get_col($query) {
                global $wpdb; 
                return call_user_func_array( array( $wpdb, 'get_col' ), $query );
        }

        function get_row($query) {
                global $wpdb; 
                return call_user_func_array( array( $wpdb, 'get_row' ), $query );
        }
}

$modules[] = new wpdbshell();