private function load_next_posts_from_db()
{
$next_batch_post_ids = array_splice($this->ids_left, 0, $this->limit);
$in_post_ids_sql = _wp_export_build_IN_condition('ID', $next_batch_post_ids);
$this->results = $this->db->get_results("SELECT * FROM {$this->db->posts} WHERE {$in_post_ids_sql}");
if (!$this->results) {
if ($this->db->last_error) {
throw new WP_Iterator_Exception('Database error: ' . $this->db->last_error);
} else {
return false;
}
}
return true;
}
private function attachments_for_specific_post_types($post_ids)
{
global $wpdb;
if (!$this->filters['post_type']) {
return array();
}
$attachment_ids = array();
while ($batch_of_post_ids = array_splice($post_ids, 0, self::QUERY_CHUNK)) {
$post_parent_condition = _wp_export_build_IN_condition('post_parent', $batch_of_post_ids);
$attachment_ids = array_merge($attachment_ids, (array) $wpdb->get_col("SELECT ID FROM {$wpdb->posts} WHERE post_type = 'attachment' AND {$post_parent_condition}"));
}
return array_map('intval', $attachment_ids);
}
