警告：mysql_num_rows（）预计参数1是资源，

Question

Possible Duplicate:
mysql_fetch_array() expects parameter 1 to be resource, boolean given in select

代码 -

$q="SELECT * FROM tbl_quevote WHERE que_id = '".$qid."' and voteby='".$uid."'"; 

$result = $mysqli->query($q) or die(mysqli_error($mysqli)); 
$num_rows = mysql_num_rows($result); 

echo $num_rows; 

错误： 警告：mysql_num_rows（）预计参数1是资源，对象在C中给出：\ XAMPP \ htdocs中\ shizin \上线voting.php 13
how to check result is empty?

Answer 1

$num_rows = $result->num_rows; 

Answer 2

int mysql_num_rows (resource $result) 检索结果集中的行数。此命令仅适用于返回实际结果集的语句，如SELECT或SHOW。要检索受INSERT, UPDATE, REPLACE or DELETE查询影响的行数，请使用mysql_affected_rows()。