/**
* Check that legacy data exists before doing anything
*
* @return void
*/
public static function load()
{
// Exit early if there is no option holding the DB version
if (false === get_site_option('wp_stream_db')) {
return;
}
global $wpdb;
// If there are no legacy tables found, then attempt to clear all legacy data and exit early
if (null === $wpdb->get_var("SHOW TABLES LIKE '{$wpdb->base_prefix}stream'")) {
self::drop_legacy_data(false);
return;
}
self::$site_id = is_multisite() ? get_current_site()->id : 1;
self::$blog_id = get_current_blog_id();
$since = WP_Stream::$api->get_plan_retention_max_date();
self::$record_count = $wpdb->get_var($wpdb->prepare("\n\t\t\t\tSELECT COUNT(*)\n\t\t\t\tFROM {$wpdb->base_prefix}stream AS s, {$wpdb->base_prefix}stream_context AS sc\n\t\t\t\tWHERE s.site_id = %d\n\t\t\t\t\tAND s.blog_id = %d\n\t\t\t\t\tAND s.type = 'stream'\n\t\t\t\t\tAND s.created > %s\n\t\t\t\t\tAND sc.record_id = s.ID\n\t\t\t\t", self::$site_id, self::$blog_id, $since));
// If there are no legacy records for this site/blog, then attempt to clear all legacy data and exit early
if (0 === self::$record_count) {
self::drop_legacy_data();
return;
}
self::$limit = apply_filters('wp_stream_migrate_chunk_size', 100);
add_action('admin_notices', array(__CLASS__, 'migrate_notice'), 9);
add_action('wp_ajax_wp_stream_migrate_action', array(__CLASS__, 'process_migrate_action'));
}