RCCWP_Post::DeletePostMetaData PHP Method

    function DeletePostMetaData($postId)
    {
        global $wpdb;
        //only delete images and postmeta fields with write panels
        if (count(get_post_meta($postId, RC_CWP_POST_WRITE_PANEL_ID_META_KEY))) {
            $sql = $wpdb->prepare("SELECT wp_pm.meta_value  FROM " . MF_TABLE_POST_META . " mf_pm, " . MF_TABLE_GROUP_FIELDS . " mf_cf, {$wpdb->postmeta} wp_pm\n      \t\tWHERE mf_pm.field_name = mf_cf.name AND mf_cf.type = 9 AND mf_pm.post_id = %d AND wp_pm.meta_id = mf_pm.id", array($postId));
            $images = $wpdb->get_results($sql);
            foreach ($images as $image) {
                if ($image->meta_value != '') {
                    $tmp = sprintf('%s%s', MF_FILES_PATH, $image->meta_value);
                    do_action('mf_before_delete_file', $image->meta_value);
                    @unlink($tmp);
                }
            }
            //delete all data of postmeta (WP and MF)
            $sql = $wpdb->prepare("DELETE a,b from {$wpdb->postmeta} a INNER JOIN " . MF_TABLE_POST_META . " b WHERE a.meta_id = b.id AND a.post_id = %d", array($postId));
            $wpdb->query($query);
            $sql_mf = $wpdb->prepare("DELETE from " . MF_TABLE_POST_META . " WHERE post_id = %d", array($postId));
            $wpdb->query($sql_mf);
        }
    }