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<?php
# Copyright (C) 2006-2011 Tobias Leupold <tobias.leupold@web.de>
#
# This file is part of the b8 package
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation in version 2.1 of the License.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
# License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
/**
* The MySQL abstraction layer for communicating with the database.
* Copyright (C) 2009 Oliver Lillie (aka buggedcom)
* Copyright (C) 2010-2011 Tobias Leupold <tobias.leupold@web.de>
*
* @license LGPL
* @access public
* @package b8
* @author Oliver Lillie (aka buggedcom) (original PHP 5 port and optimizations)
* @author Tobias Leupold
*/
class b8_storage_mysql extends b8_storage_base
{
public $config = array(
'database' => 'b8_wordlist',
'table_name' => 'b8_wordlist',
'host' => 'localhost',
'user' => FALSE,
'pass' => FALSE,
'connection' => NULL
);
public $b8_config = array(
'degenerator' => NULL,
'today' => NULL
);
private $_connection = NULL;
private $_deletes = array();
private $_puts = array();
private $_updates = array();
const DATABASE_CONNECTION_FAIL = 'DATABASE_CONNECTION_FAIL';
const DATABASE_CONNECTION_ERROR = 'DATABASE_CONNECTION_ERROR';
const DATABASE_CONNECTION_BAD_RESOURCE = 'DATABASE_CONNECTION_BAD_RESOURCE';
const DATABASE_SELECT_ERROR = 'DATABASE_SELECT_ERROR';
const DATABASE_TABLE_ACCESS_FAIL = 'DATABASE_TABLE_ACCESS_FAIL';
const DATABASE_WRONG_VERSION = 'DATABASE_WRONG_VERSION';
/**
* Constructs the database layer.
*
* @access public
* @param string $config
*/
function __construct($config, $degenerator, $today)
{
# Pass some variables of the main b8 config to this class
$this->b8_config['degenerator'] = $degenerator;
$this->b8_config['today'] = $today;
# Validate the config items
if(count($config) > 0) {
foreach ($config as $name => $value) {
switch($name) {
case 'table_name':
case 'host':
case 'user':
case 'pass':
case 'database':
$this->config[$name] = (string) $value;
break;
case 'connection':
if($value !== NULL) {
if(is_resource($value) === TRUE) {
$resource_type = get_resource_type($value);
$this->config['connection'] = $resource_type !== 'mysql link' && $resource_type !== 'mysql link persistent' ? FALSE : $value;
}
else
$this->config['connection'] = FALSE;
}
break;
}
}
}
}
/**
* Closes the database connection.
*
* @access public
* @return void
*/
function __destruct()
{
if($this->_connection === NULL)
return;
# Commit any changes before closing
$this->_commit();
# Just close the connection if no link-resource was passed and b8 created it's own connection
if($this->config['connection'] === NULL)
mysql_close($this->_connection);
$this->connected = FALSE;
}
/**
* Connect to the database and do some checks.
*
* @access public
* @return mixed Returns TRUE on a successful database connection, otherwise returns a constant from b8.
*/
public function connect()
{
# Are we already connected?
if($this->connected === TRUE)
return TRUE;
# Are we using an existing passed resource?
if($this->config['connection'] === FALSE) {
# ... yes we are, but the connection is not a resource, so return an error
$this->connected = FALSE;
return self::DATABASE_CONNECTION_BAD_RESOURCE;
}
elseif($this->config['connection'] === NULL) {
# ... no we aren't so we have to connect.
if($this->_connection = mysql_connect($this->config['host'], $this->config['user'], $this->config['pass'])) {
if(mysql_select_db($this->config['database'], $this->_connection) === FALSE) {
$this->connected = FALSE;
return self::DATABASE_SELECT_ERROR . ": " . mysql_error();
}
}
else {
$this->connected = FALSE;
return self::DATABASE_CONNECTION_ERROR;
}
}
else {
# ... yes we are
$this->_connection = $this->config['connection'];
}
# Just in case ...
if($this->_connection === NULL) {
$this->connected = FALSE;
return self::DATABASE_CONNECTION_FAIL;
}
# Check to see if the wordlist table exists
if(mysql_query('DESCRIBE ' . $this->config['table_name'], $this->_connection) === FALSE) {
$this->connected = FALSE;
return self::DATABASE_TABLE_ACCESS_FAIL . ": " . mysql_error();
}
# Everything is okay and connected
$this->connected = TRUE;
# Let's see if this is a b8 database and the version is okay
return $this->check_database();
}
/**
* Does the actual interaction with the database when fetching data.
*
* @access protected
* @param array $tokens
* @return mixed Returns an array of the returned data in the format array(token => data) or an empty array if there was no data.
*/
protected function _get_query($tokens)
{
# Construct the query ...
if(count($tokens) > 0) {
$where = array();
foreach ($tokens as $token) {
$token = mysql_real_escape_string($token, $this->_connection);
array_push($where, $token);
}
$where = 'token IN ("' . implode('", "', $where) . '")';
}
else {
$token = mysql_real_escape_string($token, $this->_connection);
$where = 'token = "' . $token . '"';
}
# ... and fetch the data
$result = mysql_query('
SELECT token, count
FROM ' . $this->config['table_name'] . '
WHERE ' . $where . ';
', $this->_connection);
$data = array();
while ($row = mysql_fetch_array($result, MYSQL_ASSOC))
$data[$row['token']] = $row['count'];
mysql_free_result($result);
return $data;
}
/**
* Store a token to the database.
*
* @access protected
* @param string $token
* @param string $count
* @return void
*/
protected function _put($token, $count) {
$token = mysql_real_escape_string($token, $this->_connection);
$count = mysql_real_escape_string($count, $this->_connection);;
array_push($this->_puts, '("' . $token . '", "' . $count . '")');
}
/**
* Update an existing token.
*
* @access protected
* @param string $token
* @param string $count
* @return void
*/
protected function _update($token, $count)
{
$token = mysql_real_escape_string($token, $this->_connection);
$count = mysql_real_escape_string($count, $this->_connection);
array_push($this->_updates, '("' . $token . '", "' . $count . '")');
}
/**
* Remove a token from the database.
*
* @access protected
* @param string $token
* @return void
*/
protected function _del($token)
{
$token = mysql_real_escape_string($token, $this->_connection);
array_push($this->_deletes, $token);
}
/**
* Commits any modification queries.
*
* @access protected
* @return void
*/
protected function _commit()
{
if(count($this->_deletes) > 0) {
$result = mysql_query('
DELETE FROM ' . $this->config['table_name'] . '
WHERE token IN ("' . implode('", "', $this->_deletes) . '");
', $this->_connection);
if(is_resource($result) === TRUE)
mysql_free_result($result);
$this->_deletes = array();
}
if(count($this->_puts) > 0) {
$result = mysql_query('
INSERT INTO ' . $this->config['table_name'] . '(token, count)
VALUES ' . implode(', ', $this->_puts) . ';', $this->_connection);
if(is_resource($result) === TRUE)
mysql_free_result($result);
$this->_puts = array();
}
if(count($this->_updates) > 0) {
$result = mysql_query('
INSERT INTO ' . $this->config['table_name'] . '(token, count)
VALUES ' . implode(', ', $this->_updates) . '
ON DUPLICATE KEY UPDATE ' . $this->config['table_name'] . '.count = VALUES(count);', $this->_connection);
if(is_resource($result) === TRUE)
mysql_free_result($result);
$this->_updates = array();
}
}
}
?>
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