Question

There’s this problem that has been bugging me all day now, and I hoped you could help me. I’m currently developing a plugin for WordPress, to support tourdates as a post type (it’s for a band website). For the tourdates I need to know the Venue, so I created the taxonomy Venue. Now I want to add meta data to the taxonomy so I tried adding a table to my WordPress database. This is what I’ve got so far:

global $scooby_db_version;
$scooby_db_version = '0.1';

new Venue();

class Venue {
    function __construct(){
        add_action('plugins_loaded', array(&$this, 'install'));
    }

    function install(){
        global $scooby_db_version;
        global $wpdb;
        if(get_site_option('scooby_db_version') != $scooby_db_version){
            $table_name = $wpdb->prefix."term_meta";
            $sql = "
                ------- Taxonomy Meta -------

                CREATE TABLE $table_name (
                meta_id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
                term_id bigint(20) unsigned NOT NULL DEFAULT '0',
                meta_key varchar(255) DEFAULT NULL,
                meta_value longtext,
                PRIMARY KEY  (meta_id),
                INDEX term_id (term_id),
                INDEX meta_key (meta_key)
                );";
            require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
            dbDelta($sql);

            add_option('scooby_db_version', $scooby_db_version);
        }
    }
}

This does nothing at all. Appearantly it did work once, ’cause there is a entry in the options table, but it won’t update. It seems like the function is never called at all, but when it was (hence the db-entry) it did not create a table.

I’m really frustrated about this, because I can’t continue work on my plugin this way. Can you guys figure out what could be wrong? Why doesn’t it either call my function or update my database?

Answer 1

dbDelta is both handy and a bitch.

http://codex.wordpress.org/Creating_Tables_with_Plugins#Creating_or_Updating_the_Table

• You have to put each field on its own line in your SQL statement.
• You have to have two spaces between the words PRIMARY KEY and the definition of your primary key.
• You must use the key word KEY rather than its synonym INDEX and you must include at least one KEY.