php 警告：mysql_num_rows() 期望参数 1 是资源，
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Warning: mysql_num_rows() expects parameter 1 to be resource,
提问by piku
code-
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;
Error:Warning: mysql_num_rows() expects parameter 1 to be resource, object given in C:\xampp\htdocs\shizin\voting.php on line 13how to check result is empty?
错误：警告：mysql_num_rows() 期望参数 1 是资源，对象在 C:\xampp\htdocs\shizin\voting.php 第 13 行中给出how to check result is empty?
回答by
$num_rows = $result->num_rows;
回答by manoj
int mysql_num_rows ( resource $result )Retrieves the number of rows from a result set. This command is only valid for statements like SELECTor SHOWthat return an actual result set. To retrieve the number of rows affected by a INSERT, UPDATE, REPLACE or DELETEquery, use mysql_affected_rows().
int mysql_num_rows ( resource $result )从结果集中检索行数。此命令仅对类似SELECT或SHOW返回实际结果集的语句有效。要检索受INSERT, UPDATE, REPLACE or DELETE查询影响的行数，请使用mysql_affected_rows()。
