1 files changed, 207 insertions, 0 deletions
diff --git a/phpBB/includes/config/db.php b/phpBB/includes/config/db.php
new file mode 100644
index 0000000000..b18369a479
--- /dev/null
+++ b/phpBB/includes/config/db.php
@@ -0,0 +1,207 @@
+<?php
+/**
+*
+* @package phpBB3
+* @copyright (c) 2010 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* Configuration container class
+* @package phpBB3
+*/
+class phpbb_config_db extends phpbb_config
+{
+	/**
+	* Cache instance
+	* @var phpbb_cache_driver_interface
+	*/
+	protected $cache;
+
+	/**
+	* Database connection
+	* @var phpbb_db_driver
+	*/
+	protected $db;
+
+	/**
+	* Name of the database table used for configuration.
+	* @var string
+	*/
+	protected $table;
+
+	/**
+	* Creates a configuration container with a default set of values
+	*
+	* @param phpbb_db_driver              $db    Database connection
+	* @param phpbb_cache_driver_interface $cache Cache instance
+	* @param string                       $table Configuration table name
+	*/
+	public function __construct(phpbb_db_driver $db, phpbb_cache_driver_interface $cache, $table)
+	{
+		$this->db = $db;
+		$this->cache = $cache;
+		$this->table = $table;
+
+		if (($config = $cache->get('config')) !== false)
+		{
+			$sql = 'SELECT config_name, config_value
+				FROM ' . $this->table . '
+				WHERE is_dynamic = 1';
+			$result = $this->db->sql_query($sql);
+
+			while ($row = $this->db->sql_fetchrow($result))
+			{
+				$config[$row['config_name']] = $row['config_value'];
+			}
+			$this->db->sql_freeresult($result);
+		}
+		else
+		{
+			$config = $cached_config = array();
+
+			$sql = 'SELECT config_name, config_value, is_dynamic
+				FROM ' . $this->table;
+			$result = $this->db->sql_query($sql);
+
+			while ($row = $this->db->sql_fetchrow($result))
+			{
+				if (!$row['is_dynamic'])
+				{
+					$cached_config[$row['config_name']] = $row['config_value'];
+				}
+
+				$config[$row['config_name']] = $row['config_value'];
+			}
+			$this->db->sql_freeresult($result);
+
+			$cache->put('config', $cached_config);
+		}
+
+		parent::__construct($config);
+	}
+
+	/**
+	* Removes a configuration option
+	*
+	* @param  String $key       The configuration option's name
+	* @param  bool   $use_cache Whether this variable should be cached or if it
+	*                           changes too frequently to be efficiently cached
+	* @return null
+	*/
+	public function delete($key, $use_cache = true)
+	{
+		$sql = 'DELETE FROM ' . $this->table . "
+			WHERE config_name = '" . $this->db->sql_escape($key) . "'";
+		$this->db->sql_query($sql);
+
+		unset($this->config[$key]);
+
+		if ($use_cache)
+		{
+			$this->cache->destroy('config');
+		}
+	}
+
+	/**
+	* Sets a configuration option's value
+	*
+	* @param string $key       The configuration option's name
+	* @param string $value     New configuration value
+	* @param bool   $use_cache Whether this variable should be cached or if it
+	*                          changes too frequently to be efficiently cached.
+	*/
+	public function set($key, $value, $use_cache = true)
+	{
+		$this->set_atomic($key, false, $value, $use_cache);
+	}
+
+	/**
+	* Sets a configuration option's value only if the old_value matches the
+	* current configuration value or the configuration value does not exist yet.
+	*
+	* @param  string $key       The configuration option's name
+	* @param  mixed  $old_value Current configuration value or false to ignore
+	*                           the old value
+	* @param  string $new_value New configuration value
+	* @param  bool   $use_cache Whether this variable should be cached or if it
+	*                           changes too frequently to be efficiently cached
+	* @return bool              True if the value was changed, false otherwise
+	*/
+	public function set_atomic($key, $old_value, $new_value, $use_cache = true)
+	{
+		$sql = 'UPDATE ' . $this->table . "
+			SET config_value = '" . $this->db->sql_escape($new_value) . "'
+			WHERE config_name = '" . $this->db->sql_escape($key) . "'";
+
+		if ($old_value !== false)
+		{
+			$sql .= " AND config_value = '" . $this->db->sql_escape($old_value) . "'";
+		}
+
+		$result = $this->db->sql_query($sql);
+
+		if (!$this->db->sql_affectedrows($result) && isset($this->config[$key]))
+		{
+			return false;
+		}
+
+		if (!isset($this->config[$key]))
+		{
+			$sql = 'INSERT INTO ' . $this->table . ' ' . $this->db->sql_build_array('INSERT', array(
+				'config_name'	=> $key,
+				'config_value'	=> $new_value,
+				'is_dynamic'	=> ($use_cache) ? 0 : 1));
+			$this->db->sql_query($sql);
+		}
+
+		if ($use_cache)
+		{
+			$this->cache->destroy('config');
+		}
+
+		$this->config[$key] = $new_value;
+		return true;
+	}
+
+	/**
+	* Increments an integer config value directly in the database.
+	*
+	* Using this method instead of setting the new value directly avoids race
+	* conditions and unlike set_atomic it cannot fail.
+	*
+	* @param string $key       The configuration option's name
+	* @param int    $increment Amount to increment by
+	* @param bool   $use_cache Whether this variable should be cached or if it
+	*                          changes too frequently to be efficiently cached.
+	*/
+	function increment($key, $increment, $use_cache = true)
+	{
+		if (!isset($this->config[$key]))
+		{
+			$this->set($key, '0', $use_cache);
+		}
+
+		$sql_update = $this->db->cast_expr_to_string($this->db->cast_expr_to_bigint('config_value') . ' + ' . (int) $increment);
+
+		$this->db->sql_query('UPDATE ' . $this->table . '
+			SET config_value = ' . $sql_update . "
+			WHERE config_name = '" . $this->db->sql_escape($key) . "'");
+
+		if ($use_cache)
+		{
+			$this->cache->destroy('config');
+		}
+
+		$this->config[$key] += $increment;
+	}
+}