Memcache results and while loop - php

Question

I wrote this function for caching queries:
function get_cached($query, $type = 1) {
$key = md5(strtolower($query));
$cached = $memcache->get($key);
if($cached) {
$res = unserialize($cached);
} else {
$r = mysql_query($query);
if($mode == 1) {
$res = mysql_fetch_object($r);
} else {
$res = mysql_fetch_array($r);
}
$memcache->store($key, serialize($res));
}
return $res;
}
And it kinda works, i can cache simple queries. But i have problem with queries that operate within loops.
I really can't understand how to get around this, and "port" this to use my get_cached() function first.
$ref = mysql_query("query");
while($res = mysql_fetch_object($ref)) {
//do something with results
}
How i can do it through cache?

Answer 1

You cannot store the mysql result object but you can fetch all rows into an array and cache the array. like
function get_cached($query, $type = 1) {
$key = md5(strtolower($query) . $type);
$cached = $memcache->get($key);
if($cached) {
return unserialize($cached);
} else {
$r = mysql_query($query);
$data = array();
if($mode == 1) {
foreach($row = mysql_fetch_object($r)) {
$data[] = $row;
}
} else {
foreach($row = mysql_fetch_array($r)) {
$data[] = $row;
}
}
$memcache->store($key, serialize($data));
}
return $data;
}
don't forget to store the type of your functions as cache key too, otherwise you fetch a results set with type==1 and in return you get the elements as array