Memcache

Overview

Objective

Learn how to use memcache with ProdigyView.

Requirements

Basic Understanding of Cache

Estimated Time

8 Minutes

Follow Along With Code Example

1. Download a copy of the example code at www.prodigyview.com/source.

2. Install the system in an environment you feel comfortable testing in.

3.Proceed to examples/system/Memcache.php

Installing MemcacheIn order to use memcache, you must have it installed. Installation differs on distribution but the basics are this.

Ubuntu1. apt-get install memcached php5-memcahce

2. pecl install memcache

Centos1. rpm -Uvh

http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm

2. yum install memcached php-pecl-memcache

Both1. pecl install memcache

2. Copy ‘memcache.so’ into your php.ini

3. service memcached start

4. Restart apache or nginx

Cache ServerBefore we can use memcache, we need to setup our memcache servers. Replace the localhost with the server you have memcache running on. Multiple memcache servers can be added to config array.

1. Set the option for memcache servers

2. Set the host 3. Set the option to connect to the server to true.

4. Pass the configuration into the init.

Write To MemcacheWriting to memcache is relatively easy. All you need the key/name of the cache, and the data to pass the cache. Writing to memcache accepts objects and arrays also.

1. Set the key/name of the cache 2. Pass the data to the cache

3. Read data based on key

Set Expiration

When writing to memcache, the default expiration is set in the init. We can override the default expiration by adding it into the options.

1.Set the key/name of the cache 3. Set the expiration

4. Read the cache

2. Set the data

Add Only

Add Only is an option that will only write the data to memcache if it does not exist or the cache has expired. This can be useful for ensure that only unique values are written to cache.

1. Only write to cache has expired or does not exist

2. Read cached value

ReplaceReplace is an option that will only replace the cache if it exist and has not expired. Otherwise nothing its written.

1. Write cache only if it exist

2. Read the cached value

Removing MemcacheRemoving a value from memcache is accomplished by using the key that was used to save it. Call the PVCache::removeCache() method.

Delete the memcache using the key

Flush Memcache

Flushing the memcache will expire all the data and subsequently remove all the expired data. There is no key passed when flushing data, just set the option of flush to true.

Set the option for flushing the memcache

Review1. Set the memcache servers in the init.

2. Use PVCache::writeMemcache to write to memcache

3. The option add_only will only write to cache if they key does not exist while the option replace will only write to memcache if the key does exist.

4. Use PVCache::readMemcache to read a stored cached value

5. Use PVCache::deleteMemcache to delete the memcache associated with a key

API ReferenceFor a better understanding of cache in ProdigyView, visit the api by clicking on the link below.

PVCache

www.prodigyview.com

More Tutorials

For more tutorials, please visit:

http://www.prodigyview.com/tutorials