memcached multiple mysql results - php

Question

I'm trying to set up memcached to store the results of the query that pulls all the data to be shown on my front page. when i use memcached for one result it works fine, but when I set the query to 'LIMIT 10' and pull the cache it still only shows one result when I var_dump.
Is there something that I am missing? Or am I really only able to store one row at a time?
My basic syntax is as follows (result is assuming key has been set):
$sql = "select * from active limit 10";
//create an index key for memcache
$key = md5('query'.$sql);
$result = $memcache->get($key);
var_dump($result);
edit: added entire code i am trying to work with
$memcache = new Memcache;
$memcache->connect('127.0.0.1', 11211) or die ("Could not connect");
$sql = "select * from active limit 10";
$key = md5('query'.$sql);
$result = $memcache->get($key);
if($result == null) {
$qry = mysql_query($sql) or die(mysql_error()." : $sql");
if(mysql_num_rows($qry)> 0) {
$result = mysql_fetch_object($qry);
echo "THIS IS NOT CACHE<br>";
var_dump($result);
//store it
$memcache->set($key,$result,0,10);
}
}
else {
echo "this is cached<br>";
var_dump($result);
}

Answer 1

You are using:
$result = mysql_fetch_object($qry);
which only retrieve a single record from the database.
What you need to do is loop through and build an array of objects:
while ($result[] = mysql_fetch_object($qry));
which you can then serialize and cache.
Your code should then look something like this:
...
if($result == null) {
$qry = mysql_query($sql) or die(mysql_error()." : $sql");
while ($result[] = mysql_fetch_object($qry));
// cache it
$memcache->set($key,serialize($result),0,10);
}
...

Answer 2

You need to loop through your results, I'd recommend this:
$cachedResults = $memcache->get($key);
if (!empty($cachedResults)) {
var_dump(unserialize($cachedResults));
exit;
}
$qry = mysql_query($sql) or die(mysql_error()." : $sql");
while ($row = mysql_fetch_object($qry)) {
$results[] = $row;
}
$memcache->set($key, serialize($results));
Remember, if you already have the key in cache, then it will never hit the query to reload the correct result set, so flush it first, then try this code snippet.