PDO Memcached PHP - php

Question

I'm trying to implement memcached into my server due to how large the database gets so quickly. I was wondering how I'm able to implement it into this code:
function getWorkers($db)
{
$meminstance = new Memcache();
$meminstance->pconnect('localhost', 11211);
$del = $db->prepare('SELECT DISTINCT(address) from works');
$del->execute();
$arr = $del->fetchAll();
$works = getMaxWork($db);
foreach($arr as $a)
{
$del = $db->prepare('SELECT * FROM works WHERE address = \'' . $a[0] . '\'');
$del->execute();
$work = $del->rowCount();
echo '<tr>';
echo '<td>' . htmlspecialchars($a[0], ENT_QUOTES, 'UTF-8') . '</td>';
echo '<td>' . $work . '</td>';
echo '<td>' . round(intval($work)/intval($works)*100, 2) . '</td>';
echo '</tr>';
}
}

Answer 1

Here you go
function getData($db)
{
$meminstance = new Memcache();
$meminstance->pconnect('localhost', 11211);
$sqlQuery = 'SELECT DISTINCT(address) from works';
$memcacheKey = md5($sqlQuery);
if ( $arr = $meminstance->get(memcacheKey) )
{
// its in cache do nothing
}
else
{
// its not in cache, so we came here, lets now get it from db and cache it
$del = $db->prepare($sqlQuery);
$del->execute();
$arr = $del->fetchAll();
$works = getMaxWork($db);
// lets now cache it
$meminstance->set(memcacheKey,$arr);
}
foreach($arr as $a)
{
$sqlQuery = 'SELECT * FROM works WHERE address = \'' . $a[0] . '\'';
$memcacheKey = md5($sqlQuery);
if ( $del = $meminstance->get($memcacheKey))
{
//its in cache yaaaaaaaa :D
}
else
{
$del = $db->prepare('SELECT * FROM works WHERE address = \'' . $a[0] . '\'');
$del->execute();
$work = $del->rowCount();
// lets cache it here
$meminstance->set($memcacheKey,$del);
}
echo '<tr>';
echo '<td>' . htmlspecialchars($a[0], ENT_QUOTES, 'UTF-8') . '</td>';
echo '<td>' . $work . '</td>';
echo '<td>' . round(intval($work)/intval($works)*100, 2) . '</td>';
echo '</tr>';
}
}
The logic when you are using memcache in your website. Is it md5 the sql queries so they will be unique. You first try to fetch from memcached, ( you md5 the sql Query) so it will be the key. if you dont get anything, you get the data from database and then save it into memcache. Which means you md5 the sql Query to make they key so it will be unique, and you pass the returned result from database as its value
key ===> md5(Sql Query )
value ==> the object, result set that is fetched from database
// pseudocode
if ( Get data from memcache passed )
{
return result;
}
else
{
get the data from database
save it into memcache
}
Note: If you are running on a single server, better to look into APC rather than memcached