I know that the following mysql query produces the exact results I wish to echo within single.php:

SELECT meta_value
FROM `wp_taxonomymeta`
WHERE `taxonomy_id` =565
AND `meta_key` LIKE 'baseurl'

First, I need to be able to use $wpdb to output that result, and no matter what I try I can't get it to work. My final try:

<?php global $wpdb;
    $toc = $wpdb->get_row("
SELECT meta_value
FROM `wp_taxonomymeta`
WHERE `taxonomy_id` =565
AND `meta_key` LIKE 'baseurl'
    echo $toc; ?>

produced the following error:

Catchable fatal error: Object of class stdClass could not be converted to string in /wp-content/themes/new/single.php on line 22

Second... and it's important. The value 565 I am using for the taxonomy_id was only for testing... the actual value I need to insert in place of the number 565 can be displayed in single.php using:

<?php $term = get_term_by('id', $termID, 'dataset'); echo $term->term_id; ?>

For reference, so you can understand what I'm trying to do... I have assigned a custom field to a taxonomy and am trying to get the results of that custom field to display in single.php... while I found a plugin (Ultimate CMS) that would do this for me, it also chooses to display a filter for all taxonomies at the top of my Post Screen... when you have 50,000+ rows in your taxonomy that causes way to much page load in the admin, and I can't find a way to suppress it.

Any help with my NOOB try at coding would be appreciated!


  • How are you assigning the custom field to the taxonomy?
    – brasofilo
    Feb 3, 2013 at 4:12
  • @brasofilo The taxonomy_id in the custom field (wp_taxonomymeta table) is equal to the term_id in the taxonomy (term_taxonomy table).
    – perdrix
    Feb 3, 2013 at 4:21

1 Answer 1


Catchable fatal error: Object of class stdClass could not be converted to string in /wp-content/themes/new/single.php on line 22

This is because $wpdb->get_row returns an object by default and you can't echo an object. Changing echo $toc to echo $toc->meta_value will give you your desired result.

Your other problem is that multiple terms can have have the same term_id. Your custom table should be using the term_taxonomy_id which will always be unique.

global $wpdb;
$term = get_term_by('id', $termID, 'dataset');  //Seems redundant does $term->term_id === $termID???
$query = $wpdb->prepare( "SELECT * FROM {$wpdb->taxonomymeta}
                          WHERE `taxonomy_id` = %d
                          AND `meta_key` LIKE 'baseurl' ",
                          $term->term_id );
$toc = $wpdb->get_row( $query );
echo $toc->meta_value;
  • Thanks for the reply! I'll admit I'm never too old to learn something new, and you've taught me a couple of things here. The table I was using was actually created by the plugin initially referenced at the top... so I'll create my own table using the term_taxonomy_id instead. I'm going to edit your code above to show the resulting code that ended up working. I had to slightly tweak yours to make sure it referenced the prefix for the table, irregardless of what it was. I also removed your get_term_by as it isn't needed (which is what you thought).
    – perdrix
    Feb 3, 2013 at 6:33

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