<?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 PostgreSQL
if (!function_exists('pg_connect'))
exit('This PHP environment doesn\'t have PostgreSQL support built in. PostgreSQL support is required if you want to use a PostgreSQL database to run this forum. Consult the PHP documentation for further assistance.');
class DBLayer
{
var $prefix;
var $link_id;
var $query_result;
var $last_query_text = array();
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)
{
$this->prefix = $db_prefix;
if ($db_host != '')
{
if (strpos($db_host, ':') !== false)
{
list($db_host, $dbport) = explode(':', $db_host);
$connect_str[] = 'host='.$db_host.' port='.$dbport;
}
else
{
if ($db_host != 'localhost')
$connect_str[] = 'host='.$db_host;
}
}
if ($db_name)
$connect_str[] = 'dbname='.$db_name;
if ($db_username != '')
$connect_str[] = 'user='.$db_username;
if ($db_password != '')
$connect_str[] = 'password='.$db_password;
if ($p_connect)
$this->link_id = @pg_pconnect(implode(' ', $connect_str));
else
$this->link_id = @pg_connect(implode(' ', $connect_str));
if (!$this->link_id)
error('Unable to connect to PostgreSQL server', __FILE__, __LINE__);
else
return $this->link_id;
}
function start_transaction()
{
++$this->in_transaction;
return (@pg_query($this->link_id, 'BEGIN')) ? true : false;
}
function end_transaction()
{
--$this->in_transaction;
if (@pg_query($this->link_id, 'COMMIT'))
return true;
else
{
@pg_query($this->link_id, 'ROLLBACK');
return false;
}
}
function query($sql, $unbuffered = false) // $unbuffered is ignored since there is no pgsql_unbuffered_query()
{
if (strrpos($sql, 'LIMIT') !== false)
$sql = preg_replace('#LIMIT ([0-9]+),([ 0-9]+)#', 'LIMIT \\2 OFFSET \\1', $sql);
if (defined('PUN_SHOW_QUERIES'))
$q_start = get_microtime();
@pg_send_query($this->link_id, $sql);
$this->query_result = @pg_get_result($this->link_id);
if (pg_result_status($this->query_result) != PGSQL_FATAL_ERROR)
{
if (defined('PUN_SHOW_QUERIES'))
$this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start));
++$this->num_queries;
$this->last_query_text[$this->query_result] = $sql;
return $this->query_result;
}
else
{
if (defined('PUN_SHOW_QUERIES'))
$this->saved_queries[] = array($sql, 0);
$this->error_msg = @pg_result_error($this->query_result);
if ($this->in_transaction)
@pg_query($this->link_id, 'ROLLBACK');
--$this->in_transaction;
return false;
}
}
function result($query_id = 0, $row = 0)
{
return ($query_id) ? @pg_fetch_result($query_id, $row, 0) : false;
}
function fetch_assoc($query_id = 0)
{
return ($query_id) ? @pg_fetch_assoc($query_id) : false;
}
function fetch_row($query_id = 0)
{
return ($query_id) ? @pg_fetch_row($query_id) : false;
}
function num_rows($query_id = 0)
{
return ($query_id) ? @pg_num_rows($query_id) : false;
}
function affected_rows()
{
return ($this->query_result) ? @pg_affected_rows($this->query_result) : false;
}
function insert_id()
{
$query_id = $this->query_result;
if ($query_id && $this->last_query_text[$query_id] != '')
{
if (preg_match('/^INSERT INTO ([a-z0-9\_\-]+)/is', $this->last_query_text[$query_id], $table_name))
{
// Hack (don't ask)
if (substr($table_name[1], -6) == 'groups')
$table_name[1] .= '_g';
$temp_q_id = @pg_query($this->link_id, 'SELECT currval(\''.$table_name[1].'_id_seq\')');
return ($temp_q_id) ? intval(@pg_fetch_result($temp_q_id, 0)) : false;
}
}
return false;
}
function get_num_queries()
{
return $this->num_queries;
}
function get_saved_queries()
{
return $this->saved_queries;
}
function free_result($query_id = false)
{
if (!$query_id)
$query_id = $this->query_result;
return ($query_id) ? @pg_free_result($query_id) : false;
}
function escape($str)
{
return is_array($str) ? '' : pg_escape_string($str);
}
function error()
{
$result['error_sql'] = @current(@end($this->saved_queries));
$result['error_no'] = false;
/*
if (!empty($this->query_result))
{
$result['error_msg'] = trim(@pg_result_error($this->query_result));
if ($result['error_msg'] != '')
return $result;
}
$result['error_msg'] = (!empty($this->link_id)) ? trim(@pg_last_error($this->link_id)) : trim(@pg_last_error());
*/
$result['error_msg'] = $this->error_msg;
return $result;
}
function close()
{
if ($this->link_id)
{
if ($this->in_transaction)
{
if (defined('PUN_SHOW_QUERIES'))
$this->saved_queries[] = array('COMMIT', 0);
@pg_query($this->link_id, 'COMMIT');
}
if ($this->query_result)
@pg_free_result($this->query_result);
return @pg_close($this->link_id);
}
else
return false;
}
}