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I'm trying to get_results() in my widget's front end, this is my current code:

public function widget( $args, $instance ) {
    echo $args['before_widget'];
    if($children = $wpdb->get_results( "SELECT ID FROM $wpdb->posts" ))
         echo "working";
    echo $args['after_widget'];
    }

However I'm getting error "Fatal error: Call to a member function get_results() on a non-object".

I need to access the database to create a menu with the page children. What's am I doing wrong?

1

It seems that you can't access to it. Please try add global $wpdb; to your function.

UPDATE

For reference, in WordPress Codex you will find:

WordPress provides a global variable, $wpdb, which is an instantiation of the class already set up to talk to the WordPress database. Always use the global $wpdb variable. (Remember to globalize $wpdb before using it in any custom functions.)

1

add global $wpdb since you are using it in function, which has local scope .

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