MatthiasMullie\Scrapbook\Adapters\SQL::set PHP Method

    public function set($key, $value, $expire = 0)
    {
        // PostgreSQL doesn't have a decent UPSERT (like REPLACE or even INSERT
        // ... ON DUPLICATE KEY UPDATE ...); here's a "works for all" downgrade
        $success = $this->add($key, $value, $expire);
        if ($success) {
            return true;
        }
        $success = $this->replace($key, $value, $expire);
        if ($success) {
            return true;
        }
        return false;
    }