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lnkohana/modules/database/classes/Kohana/Config/Database/Writer.php

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2013-04-22 04:09:50 +00:00
<?php defined('SYSPATH') OR die('No direct script access.');
/**
* Database writer for the config system
*
* @package Kohana
* @category Configuration
* @author Kohana Team
* @copyright (c) 2007-2012 Kohana Team
* @license http://kohanaframework.org/license
*/
class Kohana_Config_Database_Writer extends Config_Database_Reader implements Kohana_Config_Writer
{
protected $_loaded_keys = array();
/**
* Tries to load the specificed configuration group
*
* Returns FALSE if group does not exist or an array if it does
*
* @param string $group Configuration group
* @return boolean|array
*/
public function load($group)
{
$config = parent::load($group);
if ($config !== FALSE)
{
$this->_loaded_keys[$group] = array_combine(array_keys($config), array_keys($config));
}
return $config;
}
/**
* Writes the passed config for $group
*
* Returns chainable instance on success or throws
* Kohana_Config_Exception on failure
*
* @param string $group The config group
* @param string $key The config key to write to
* @param array $config The configuration to write
* @return boolean
*/
public function write($group, $key, $config)
{
$config = serialize($config);
// Check to see if we've loaded the config from the table already
if (isset($this->_loaded_keys[$group][$key]))
{
$this->_update($group, $key, $config);
}
else
{
// Attempt to run an insert query
// This may fail if the config key already exists in the table
// and we don't know about it
try
{
$this->_insert($group, $key, $config);
}
catch (Database_Exception $e)
{
// Attempt to run an update instead
$this->_update($group, $key, $config);
}
}
return TRUE;
}
/**
* Insert the config values into the table
*
* @param string $group The config group
* @param string $key The config key to write to
* @param array $config The serialized configuration to write
* @return boolean
*/
protected function _insert($group, $key, $config)
{
DB::insert($this->_table_name, array('group_name', 'config_key', 'config_value'))
->values(array($group, $key, $config))
->execute($this->_db_instance);
return $this;
}
/**
* Update the config values in the table
*
* @param string $group The config group
* @param string $key The config key to write to
* @param array $config The serialized configuration to write
* @return boolean
*/
protected function _update($group, $key, $config)
{
DB::update($this->_table_name)
->set(array('config_value' => $config))
->where('group_name', '=', $group)
->where('config_key', '=', $key)
->execute($this->_db_instance);
return $this;
}
}