public function increment($ip, $type)
    {
        $this->assertReady();
        
        $sql = sprintf("INSERT INTO %s SET %s=:type, %s=:ip",
            $this->dbAdapter->platform->quoteIdentifier($this->table),
            $this->dbAdapter->platform->quoteIdentifier($this->typeColumn),
            $this->dbAdapter->platform->quoteIdentifier($this->ipColumn));
        
        $parameters = array(
            'type' => $type,
            'ip' => $ip,
        );
        
        $this->dbAdapter->query($sql, $parameters);
    }