我试图执行一些查询以获取有关某些图像的信息页面。我写了一个功能致命错误:调用非对象的成员函数fetch_assoc()
function get_recent_highs($view_deleted_images=false)
{
$lower = $this->database->conn->real_escape_string($this->page_size * ($this->page_number - 1));
$query = "SELECT image_id, date_uploaded FROM `images` ORDER BY ((SELECT SUM(image_id=`images`.image_id) FROM `image_votes` AS score)/(SELECT DATEDIFF(NOW() , date_uploaded) AS diff)) DESC LIMIT " . $this->page_size . " OFFSET $lower"; //move to database class
$result = $this->database->query($query);
$page = array();
while($row = $result->fetch_assoc())
{
try
{
array_push($page, new Image($row['image_id'], $view_deleted_images));
}
catch(ImageNotFoundException $e)
{
throw $e;
}
}
return $page;
}
根据它们的流行度来选择这些图像的一个页面。我已经编写了一个Database
类来处理与数据库的交互,还有一个Image
类,它包含关于图像的信息。当我尝试运行这个时,我得到一个错误。
Fatal error: Call to a member function fetch_assoc() on a non-object
$result
是mysqli的结果集,所以我很困惑,为什么这是行不通的。
$ result上的var_dump证实它是一个mysqli结果集? – erisco 2011-02-25 18:21:56