Move Kohana_Config_Database from core to database, fixes #2077

classes/kohana/config/database.php

@@ -0,0 +1,96 @@
+<?php defined('SYSPATH') or die('No direct script access.');
+/**
+ * Database-based configuration loader.
+ *
+ * Schema for configuration table:
+ *
+ *     group_name    varchar(128)
+ *     config_key    varchar(128)
+ *     config_value  text
+ *     primary key   (group_name, config_key)
+ *
+ * @package    Kohana
+ * @author     Kohana Team
+ * @copyright  (c) 2009 Kohana Team
+ * @license    http://kohanaphp.com/license.html
+ */
+class Kohana_Config_Database extends Kohana_Config_Reader {
+
+	protected $_database_instance = 'default';
+
+	protected $_database_table = 'config';
+
+	public function __construct(array $config = NULL)
+	{
+		if (isset($config['instance']))
+		{
+			$this->_database_instance = $config['instance'];
+		}
+
+		if (isset($config['table']))
+		{
+			$this->_database_table = $config['table'];
+		}
+
+		parent::__construct();
+	}
+
+	/**
+	 * Query the configuration table for all values for this group and
+	 * unserialize each of the values.
+	 *
+	 * @param   string  group name
+	 * @param   array   configuration array
+	 * @return  $this   clone of the current object
+	 */
+	public function load($group, array $config = NULL)
+	{
+		if ($config === NULL AND $group !== 'database')
+		{
+			// Load all of the configuration values for this group
+			$query = DB::select('config_key', 'config_value')
+				->from($this->_database_table)
+				->where('group_name', '=', $group)
+				->execute($this->_database_instance);
+
+			if (count($query) > 0)
+			{
+				// Unserialize the configuration values
+				$config = array_map('unserialize', $query->as_array('config_key', 'config_value'));
+			}
+		}
+
+		return parent::load($group, $config);
+	}
+
+	/**
+	 * Overload setting offsets to insert or update the database values as
+	 * changes occur.
+	 *
+	 * @param   string   array key
+	 * @param   mixed    new value
+	 * @return  mixed
+	 */
+	public function offsetSet($key, $value)
+	{
+		if ( ! $this->offsetExists($key))
+		{
+			// Insert a new value
+			DB::insert($this->_database_table, array('group_name', 'config_key', 'config_value'))
+				->values(array($this->_configuration_group, $key, serialize($value)))
+				->execute($this->_database_instance);
+		}
+		elseif ($this->offsetGet($key) !== $value)
+		{
+			// Update the value
+			DB::update($this->_database_table)
+				->value('config_value', serialize($value))
+				->where('group_name', '=', $this->_configuration_group)
+				->where('config_key', '=', $key)
+				->execute($this->_database_instance);
+		}
+
+		return parent::offsetSet($key, $value);
+	}
+
+} // End Kohana_Config_Database