<?php
/***********************************************************************
Copyright (C) 2002-2005 Rickard Andersson (rickard@punbb.org)
This file is part of PunBB.
PunBB is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
PunBB 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 General Public License for more details.
You should have received a copy of the GNU 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
************************************************************************/
// Make sure we have built in support for SQLite
if (!function_exists('sqlite_open'))
exit('This PHP environment doesn\'t have SQLite support built in. SQLite support is required if you want to use a SQLite database to run this forum. Consult the PHP documentation for further assistance.');
class DBLayer
{
var $prefix;
var $link_id;
var $query_result;
var $in_transaction = 0;
var $saved_queries = array();
var $num_queries = 0;
var $error_no = false;
var $error_msg = 'Unknown';
function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect)
{
// Prepend $db_name with the path to the forum root directory
$db_name = PUN_ROOT.$db_name;
$this->prefix = $db_prefix;
if (!file_exists($db_name))
{
@touch($db_name);
@chmod($db_name, 0666);
if (!file_exists($db_name))
error('Unable to create new database \''.$db_name.'\'. Permission denied', __FILE__, __LINE__);
}
if (!is_readable($db_name))
error('Unable to open database \''.$db_name.'\' for reading. Permission denied', __FILE__, __LINE__);
if (!is_writable($db_name))
error('Unable to open database \''.$db_name.'\' for writing. Permission denied', __FILE__, __LINE__);
if ($p_connect)
$this->link_id = @sqlite_popen($db_name, 0666, $sqlite_error);
else
$this->link_id = @sqlite_open($db_name, 0666, $sqlite_error);
if (!$this->link_id)
error('Unable to open database \''.$db_name.'\'. SQLite reported: '.$sqlite_error, __FILE__, __LINE__);
else
return $this->link_id;
}
function start_transaction()
{
++$this->in_transaction;
return (@sqlite_query($this->link_id, 'BEGIN')) ? true : false;
}
function end_transaction()
{
--$this->in_transaction;
if (@sqlite_query($this->link_id, 'COMMIT'))
return true;
else
{
@sqlite_query($this->link_id, 'ROLLBACK');
return false;
}
}
function query($sql, $unbuffered = false)
{
if (defined('PUN_SHOW_QUERIES'))
$q_start = get_microtime();
if ($unbuffered)
$this->query_result = @sqlite_unbuffered_query($this->link_id, $sql);
else
$this->query_result = @sqlite_query($this->link_id, $sql);
if ($this->query_result)
{
if (defined('PUN_SHOW_QUERIES'))
$this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start));
++$this->num_queries;
return $this->query_result;
}
else
{
if (defined('PUN_SHOW_QUERIES'))
$this->saved_queries[] = array($sql, 0);
$this->error_no = @sqlite_last_error($this->link_id);
$this->error_msg = @sqlite_error_string($this->error_no);
if ($this->in_transaction)
@sqlite_query($this->link_id, 'ROLLBACK');
--$this->in_transaction;
return false;
}
}
function result($query_id = 0, $row = 0)
{
if ($query_id)
{
if ($row != 0)
@sqlite_seek($query_id, $row);
return @current(@sqlite_current($query_id));
}
else
return false;
}
function fetch_assoc($query_id = 0)
{
if ($query_id)
{
$cur_row = @sqlite_fetch_array($query_id, SQLITE_ASSOC);
if ($cur_row)
{
// Horrible hack to get rid of table names and table aliases from the array keys
while (list($key, $value) = @each($cur_row))
{
$dot_spot = strpos($key, '.');
if ($dot_spot !== false)
{
unset($cur_row[$key]);
$key = substr($key, $dot_spot+1);
$cur_row[$key] = $value;
}
}
}
return $cur_row;
}
else
return false;
}
function fetch_row($query_id = 0)
{
return ($query_id) ? @sqlite_fetch_array($query_id, SQLITE_NUM) : false;
}
function num_rows($query_id = 0)
{
return ($query_id) ? @sqlite_num_rows($query_id) : false;
}
function affected_rows()
{
return ($this->query_result) ? @sqlite_changes($this->query_result) : false;
}
function insert_id()
{
return ($this->link_id) ? @sqlite_last_insert_rowid($this->link_id) : false;
}
function get_num_queries()
{
return $this->num_queries;
}
function get_saved_queries()
{
return $this->saved_queries;
}
function free_result($query_id = false)
{
return true;
}
function escape($str)
{
return is_array($str) ? '' : sqlite_escape_string($str);
}
function error()
{
$result['error_sql'] = @current(@end($this->saved_queries));
$result['error_no'] = $this->error_no;
$result['error_msg'] = $this->error_msg;
return $result;
}
function close()
{
if ($this->link_id)
{
if ($this->in_transaction)
{
if (defined('PUN_SHOW_QUERIES'))
$this->saved_queries[] = array('COMMIT', 0);
@sqlite_query($this->link_id, 'COMMIT');
}
return @sqlite_close($this->link_id);
}
else
return false;
}
}