重复密钥更新时…时间戳记未更新

Question

我有一个查询：

$sql = "INSERT INTO test_xml 
                (title, album, artist) 
        VALUES ('$pieces[2]', '$pieces[1]', '$pieces[0]') 
        ON DUPLICATE KEY UPDATE 
            time = now(), 
            album = VALUES(album), 
            artist = VALUES(artist)";

该表是：

它会更新，但会不断添加，创建新行，但不会更新：