偏移0对于MySQL结果索引64无效（或查询数据未缓冲）

Question

I am working with php and mysql and suddenly I get

mysql_data_seek() [function.mysql-data-seek]: Offset 0 is invalid for MySQL result index 64 (or the query data is unbuffered)

What does this mean.

I have no idea where to start to debug this one.

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This class is passed a mysql resource into it's constructor

 class dbResult { private $result; private $num_rows; function __construct($result) { $this->result = $result; } function result($type = 'object') { @mysql_data_seek($this->result, 0); if ($type == 'array') return mysql_fetch_assoc($this->result); if ($type == 'object') { if ($this->num_rows() == 1) { $data = new stdClass(); foreach (mysql_fetch_assoc($this->result) as $k => $v) $data->$k = $v; return $data; } if ($this->num_rows() > 1) { $data = array(); while ($result = mysql_fetch_assoc($this->result)) { $row = new stdClass(); foreach ($result as $k => $v) $row->$k = $v; $data[] = $row; } return $data; } return false; } } function num_rows() { return mysql_num_rows($this->result); } function num_fields() { return mysql_num_fields($this->result); } } 

Answer 1

if the result set is empty mysql_data_seek() will fail with a E_WARNING . That is I think happening in you case because you are not checking whether the result set is empty or not before calling the mysql_data_seek() .

Always check the result for number of rows if they are >=1 then you are safe to call mysql_data_seek()