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<?php
/*
* $Id$
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.phpdoctrine.com>.
*/
/**
* Doctrine_Cache_Sqlite
*
* @package Doctrine
* @subpackage Doctrine_Cache
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @category Object Relational Mapping
* @link www.phpdoctrine.com
* @since 1.0
* @version $Revision$
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
*/
class Doctrine_Cache_Db extends Doctrine_Cache_Driver implements Countable
{
/**
* constructor
*
* @param array $_options an array of options
*/
public function __construct($options)
{
if ( ! isset($options['connection']) ||
! ($options['connection'] instanceof Doctrine_Connection)) {
throw new Doctrine_Cache_Exception('Connection option not set.');
}
$this->_options = $options;
}
/**
* getConnection
* returns the connection object associated with this cache driver
*
* @return Doctrine_Connection connection object
*/
public function getConnection()
{
return $this->_options['connection'];
}
/**
* Test if a cache is available for the given id and (if yes) return it (false else)
*
* Note : return value is always "string" (unserialization is done by the core not by the backend)
*
* @param string $id cache id
* @param boolean $testCacheValidity if set to false, the cache validity won't be tested
* @return string cached datas (or false)
*/
public function fetch($id, $testCacheValidity = true)
{
$sql = 'SELECT data, expires FROM cache WHERE id = ?';
if ($testCacheValidity) {
$sql .= ' AND (expire=0 OR expire > ' . time() . ')';
}
$result = $this->getConnection()->fetchAssoc($sql, array($id));
return unserialize($result['data']);
}
/**
* Test if a cache is available or not (for the given id)
*
* @param string $id cache id
* @return mixed false (a cache is not available) or "last modified" timestamp (int) of the available cache record
*/
public function contains($id)
{
$sql = 'SELECT expires FROM cache WHERE id = ? AND (expire=0 OR expire > ' . time() . ')';
return $this->getConnection()->fetchOne($sql, array($id));
}
/**
* Save some string datas into a cache record
*
* Note : $data is always saved as a string
*
* @param string $data data to cache
* @param string $id cache id
* @param int $lifeTime if != false, set a specific lifetime for this cache record (null => infinite lifeTime)
* @return boolean true if no problem
*/
public function save($data, $id, $lifeTime = false)
{
$sql = 'INSERT INTO cache (id, data, expires) VALUES (?, ?, ?)';
$params = array($id, serialize($data), (time() + $lifeTime));
return (bool) $this->getConnection()->exec($sql, $params);
}
/**
* Remove a cache record
*
* @param string $id cache id
* @return boolean true if no problem
*/
public function delete($id)
{
$sql = 'DELETE FROM cache WHERE id = ?';
return (bool) $this->getConnection()->exec($sql, array($id));
}
/**
* count
* returns the number of cached elements
*
* @return integer
*/
public function count()
{
return (int) $this->getConnection()->fetchOne('SELECT COUNT(*) FROM cache');
}
}