Topic awaiting preservation: Determine if a WHILE function is empty

I have a MySQL fetch line like this:

while ($row = mysql_fetch_array($result)) {
do stuff here
}

But I need to determine if the there are any results so I can print a "no results available" type statement. If there is data, the line works fine. But if there isn't I get nothing (which is fine). But I need to determine if it's nothing.

I tried using $num_classes = mysql_num_rows($row); and then checking if $num_classes was > 0, but that didn't work.

Any help would be greatly appreciated.

Thanks!

I have no idea if there is a specific function/property that tells you if there are any results, but couldn't you do something like:

$results = 0;

while ($row = mysql_fetch_array($result)) {
do stuff here
$results = 1;
}

if (!$results)
echo("No results available!");

edit: forgot that variables' names start with a $ in PHP...

kuckus (cell #282)

[This message has been edited by kuckus (edited 06-21-2002).]

If there's a way to get the length of the array returned by mysql_fetch_array($result), then you can compare that and see if it's greater than zero.

mysql_num_rows()

if (mysql_num_rows($result) > 0)

{

    while ($row = mysql_fetch_array($result))

    {

        do stuff here

    }

}

else

{

    echo("Null result set.");

}

Pugzly, in case you don't notice at first from WarMage's code from above, your call for mysql_num_rows() function was wrong, you passed $row variable (which is probably blank) instead of $results variable, which points to results returned from SQL query...

You could also use

if (!$result = mysql_query($sql))

{

     echo "no results returned";

}

else

{

    while($row = mysql_fetch_array($result))

     {

          do stuff here

     }

}

-Butcher-


[This message has been edited by butcher (edited 06-22-2002).]