：mysql_fetch_row():suppliedargumentisnotavalidMySQLresultresource

求救：mysql_fetch_row(): supplied argument is not a valid MySQL result resource

function db_connect()
{
$result = new mysqli('localhost', 'root', '654321', 'smsprj');
//$result = new mysqli('localhost', 'root', '654321');
if (!$result)
{
throw new Exception('Could not connect to database server');
}
else
{

return $result;
}
}

?>

$conn = db_connect();
$sql = $conn->query("SELECT * FROM user");

if (!$sql)
{
echo ("wrong");
}
else
{
echo "";
echo "";
while( $row = mysql_fetch_row($sql) )
{
echo "";
}
}
我的目的是将数据库中的所有用户信息显示出来
可这段程序老是报错，不知道什么原因
求大侠帮助，小弟不胜感激 mysql_fetch_row

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------解决方案--------------------
db_connect 中是这样的
$result = new mysqli('localhost', 'root', '654321', 'smsprj');

所以要这样查询
$sql = $conn->query("SELECT * FROM user");

要这样读取
while( $row = $sql->fetch_row())

userid	name	pssword	maxsmscount	maxuseday	leftday	leftsmscount
$row[0]	$row[1]	$row[2]	$row[3]	$row[4]	$row[5]	$row[6]