Correct way to select db table in WP plugin

[ravensjeff]

So I have a WP plugin that one of my devs built some time ago which has some php like this:

foreach ((array)$docs as $key => $file)
    {
        if ((int)$file === 0)
        {
            $results = $wpdb->get_var($wpdb->prepare(
                'SELECT id FROM wp_posts WHERE guid = %s',
                $file
            ));

            if ((int)$results !== 0)
            {
                $settings['docs'][$type][] = (int)$results;
            }
        }
        else
        {
            $settings['docs'][$type][] = (int)$file;
        }
    }

Problem is that the database prefix has been changed by the Security plugin. I know that I can update wp_posts above with the new prefix such as abcdef_post, but there’s gotta be a more appropriate way of doing this in a plugin. What is proper in this case?

[ravensjeff]

I believe I found my own answer:

$wpdb->prefix

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