偏移0对于MySQL结果索引64无效(或查询数据未缓冲)

Question

我正在使用php和mysql,我突然得到了

mysql_data_seek()[function.mysql-data-seek]:偏移0对MySQL结果索引64无效(或查询数据未缓冲)

这是什么意思.

我不知道从哪里开始调试这个.

---

这个类将mysql资源传递给它的构造函数

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

如果结果集为空, mysql_data_seek()则会失败E_WARNING.这就是我认为在你的情况下发生,因为在调用之前你没有检查结果集是否为空mysql_data_seek().

如果行数> = 1,请始终检查结果的行数,然后您可以安全地调用 mysql_data_seek()