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<?php
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/***********************************************************************
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Copyright (C) 2002-2005 Rickard Andersson (rickard@punbb.org)
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This file is part of PunBB.
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PunBB is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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PunBB is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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MA 02111-1307 USA
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************************************************************************/
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// Make sure we have built in support for SQLite
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if (!function_exists('sqlite_open'))
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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.');
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class DBLayer
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{
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var $prefix;
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var $link_id;
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var $query_result;
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var $in_transaction = 0;
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var $saved_queries = array();
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var $num_queries = 0;
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var $error_no = false;
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var $error_msg = 'Unknown';
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function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect)
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{
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// Prepend $db_name with the path to the forum root directory
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$db_name = PUN_ROOT.$db_name;
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$this->prefix = $db_prefix;
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if (!file_exists($db_name))
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{
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@touch($db_name);
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@chmod($db_name, 0666);
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if (!file_exists($db_name))
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error('Unable to create new database \''.$db_name.'\'. Permission denied', __FILE__, __LINE__);
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}
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if (!is_readable($db_name))
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error('Unable to open database \''.$db_name.'\' for reading. Permission denied', __FILE__, __LINE__);
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if (!is_writable($db_name))
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error('Unable to open database \''.$db_name.'\' for writing. Permission denied', __FILE__, __LINE__);
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if ($p_connect)
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$this->link_id = @sqlite_popen($db_name, 0666, $sqlite_error);
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else
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$this->link_id = @sqlite_open($db_name, 0666, $sqlite_error);
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if (!$this->link_id)
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error('Unable to open database \''.$db_name.'\'. SQLite reported: '.$sqlite_error, __FILE__, __LINE__);
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else
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return $this->link_id;
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}
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function start_transaction()
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{
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++$this->in_transaction;
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return (@sqlite_query($this->link_id, 'BEGIN')) ? true : false;
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}
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function end_transaction()
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{
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--$this->in_transaction;
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if (@sqlite_query($this->link_id, 'COMMIT'))
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return true;
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else
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{
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@sqlite_query($this->link_id, 'ROLLBACK');
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return false;
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}
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}
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function query($sql, $unbuffered = false)
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{
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if (defined('PUN_SHOW_QUERIES'))
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$q_start = get_microtime();
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if ($unbuffered)
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$this->query_result = @sqlite_unbuffered_query($this->link_id, $sql);
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else
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$this->query_result = @sqlite_query($this->link_id, $sql);
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if ($this->query_result)
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{
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if (defined('PUN_SHOW_QUERIES'))
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$this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start));
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++$this->num_queries;
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return $this->query_result;
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}
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else
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{
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if (defined('PUN_SHOW_QUERIES'))
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$this->saved_queries[] = array($sql, 0);
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$this->error_no = @sqlite_last_error($this->link_id);
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$this->error_msg = @sqlite_error_string($this->error_no);
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if ($this->in_transaction)
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@sqlite_query($this->link_id, 'ROLLBACK');
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--$this->in_transaction;
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return false;
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}
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}
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function result($query_id = 0, $row = 0)
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{
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if ($query_id)
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{
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if ($row != 0)
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@sqlite_seek($query_id, $row);
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return @current(@sqlite_current($query_id));
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}
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else
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return false;
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}
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function fetch_assoc($query_id = 0)
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{
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if ($query_id)
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{
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$cur_row = @sqlite_fetch_array($query_id, SQLITE_ASSOC);
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if ($cur_row)
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{
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// Horrible hack to get rid of table names and table aliases from the array keys
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while (list($key, $value) = @each($cur_row))
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{
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$dot_spot = strpos($key, '.');
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if ($dot_spot !== false)
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{
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unset($cur_row[$key]);
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$key = substr($key, $dot_spot+1);
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$cur_row[$key] = $value;
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}
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}
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}
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return $cur_row;
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}
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else
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return false;
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}
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function fetch_row($query_id = 0)
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{
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return ($query_id) ? @sqlite_fetch_array($query_id, SQLITE_NUM) : false;
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}
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function num_rows($query_id = 0)
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{
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return ($query_id) ? @sqlite_num_rows($query_id) : false;
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}
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function affected_rows()
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{
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return ($this->query_result) ? @sqlite_changes($this->query_result) : false;
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}
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function insert_id()
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{
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return ($this->link_id) ? @sqlite_last_insert_rowid($this->link_id) : false;
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}
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function get_num_queries()
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{
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return $this->num_queries;
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}
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function get_saved_queries()
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{
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return $this->saved_queries;
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}
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function free_result($query_id = false)
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{
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return true;
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}
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function escape($str)
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{
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return is_array($str) ? '' : sqlite_escape_string($str);
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}
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function error()
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{
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$result['error_sql'] = @current(@end($this->saved_queries));
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$result['error_no'] = $this->error_no;
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$result['error_msg'] = $this->error_msg;
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return $result;
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}
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function close()
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{
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if ($this->link_id)
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{
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if ($this->in_transaction)
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{
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if (defined('PUN_SHOW_QUERIES'))
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$this->saved_queries[] = array('COMMIT', 0);
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@sqlite_query($this->link_id, 'COMMIT');
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}
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return @sqlite_close($this->link_id);
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}
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else
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return false;
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}
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}
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