如何使用mysqli查詢而不是mysql_query沒有得到致命錯誤？

Question

我有改變的mysql_query聲明的mysqli如下

$sqlordlod = "SELECT * FROM order_list 
      WHERE user_id = '$user_id' 
      ORDER by order_id LIMIT $offset, $rec_limit "; 
$result = $mysqli->query($sqlordlod); 
$countrw = $result->num_rows; 
echo $countrw; 

數據庫連接文件

$mysqli = new mysqli($db_host, $db_user, $db_pass, $db_database); 

/* check connection */ 
if (mysqli_connect_errno()) { 
printf("Connect failed: %s\n", mysqli_connect_error()); 
exit(); 
} 

反正跟着我做了上述修改建議，但得到：

Warning: mysqli::query() expects parameter 1 to be string, object given in /Applications/XAMPP/xamppfiles/htdocs/_/globe/ru/profile.php on line 487

Fatal error: Call to a member function fetch_array() on a non-object in /Applications/XAMPP/xamppfiles/htdocs/_/globe/ru/profile.php on line 487

下面是線487

while($rowld = $mysqli->query($result)->fetch_array()) 
{ 
// flip flop controling the tr class to change the color 
if ($classchk ==3){ 
     $classchk =1; 
    } 
if ($classchk ==2){ 
    $classname = "alt"; 
}else{ 
    $classname = "none"; 

    } 

Answer 1

num_rows是一個屬性，而不是一個方法：

$countrw = $result->num_rows; 
          ^--- no function call 

Answer 2

更換

$result = $mysqli->query($sqlordlod); 

與

$result = $mysqli->query($serverconnection,$sqlordlod); 

這裏$一個ServerConnection是你的數據庫連接結果

試試這個一個

這裏是計數行

$dbhost="localhost"; 
$dbusername="root"; 
$dbpassword=""; 
$dbname="test"; 

$con=mysqli_connect($dbhost,$dbusername,$dbpassword,$dbname); 

/* check connection */ 
$sqlordlod = "SELECT * FROM tablename"; 
//$resultordlod = mysql_query($sqlordlod); 
//$countrw = mysql_num_rows($resultordlod); 
$result = mysqli_query($con, $sqlordlod); 
// fetch the result row. 
$countrw = mysqli_num_rows($result); 
echo $countrw; 

Answer 3

NUM_ROWS容易和工作代碼屬性不是方法。

$sqlordlod = "SELECT * FROM order_list 
       WHERE user_id = '$user_id' 
       ORDER by order_id LIMIT $offset, $rec_limit "; 
$result = $mysqli->query($sqlordlod); 
$countrw = $result->num_rows; 
echo $countrw; 

編輯：你的代碼真的有問題。我想你想做以下事情：

while($rowld = $result->fetch_array()) 
{ 
// flip flop controling the tr class to change the color 
if ($classchk ==3){ 
     $classchk =1; 
    } 
if ($classchk ==2){ 
    $classname = "alt"; 
}else{ 
    $classname = "none"; 

    }