php - 这个 PHP 错误是什么意思？

Question

下面的错误信息是什么意思？

Warning: mysql_data_seek() [function.mysql-data-seek]: Offset 0 is invalid for MySQL result index 3 (or the query data is unbuffered) in \\nawinfs03\home\users\web\b1878\rh.slmarble\php\getproductDB.php on line 6
or die('

代码:

if (!mysql_data_seek($results, $num)) {
    echo "<h1 style='padding:10%'>Coming soon!</h1>";
}

Answer 1

我认为您的查询没有返回任何内容。来自 PHP 手册:

..if the result set is empty (mysql_num_rows() == 0), a seek to 0 will fail with a E_WARNING..

http://php.net/manual/en/function.mysql-data-seek.php