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|
<?php
/**
*
* @package dbal
* @version $Id$
* @copyright (c) 2005 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
include_once($phpbb_root_path . 'includes/db/dbal.' . $phpEx);
/**
* Sqlite Database Abstraction Layer
* Minimum Requirement: 2.8.2+
* @package dbal
*/
class dbal_sqlite extends dbal
{
/**
* Connect to server
*/
function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
{
$this->persistency = $persistency;
$this->user = $sqluser;
$this->server = $sqlserver . (($port) ? ':' . $port : '');
$this->dbname = $database;
$error = '';
$this->db_connect_id = ($this->persistency) ? @sqlite_popen($this->server, 0666, $error) : @sqlite_open($this->server, 0666, $error);
if ($this->db_connect_id)
{
@sqlite_query('PRAGMA short_column_names = 1', $this->db_connect_id);
// @sqlite_query('PRAGMA encoding = "UTF-8"', $this->db_connect_id);
}
return ($this->db_connect_id) ? true : array('message' => $error);
}
/**
* Version information about used database
* @param bool $raw if true, only return the fetched sql_server_version
* @param bool $use_cache if true, it is safe to retrieve the stored value from the cache
* @return string sql server version
*/
function sql_server_info($raw = false, $use_cache = true)
{
global $cache;
if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('sqlite_version')) === false)
{
$result = @sqlite_query('SELECT sqlite_version() AS version', $this->db_connect_id);
$row = @sqlite_fetch_array($result, SQLITE_ASSOC);
$this->sql_server_version = (!empty($row['version'])) ? $row['version'] : 0;
if (!empty($cache) && $use_cache)
{
$cache->put('sqlite_version', $this->sql_server_version);
}
}
return ($raw) ? $this->sql_server_version : 'SQLite ' . $this->sql_server_version;
}
/**
* SQL Transaction
* @access private
*/
function _sql_transaction($status = 'begin')
{
switch ($status)
{
case 'begin':
return @sqlite_query('BEGIN', $this->db_connect_id);
break;
case 'commit':
return @sqlite_query('COMMIT', $this->db_connect_id);
break;
case 'rollback':
return @sqlite_query('ROLLBACK', $this->db_connect_id);
break;
}
return true;
}
/**
* Base query method
*
* @param string $query Contains the SQL query which shall be executed
* @param int $cache_ttl Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
* @return mixed When casted to bool the returned value returns true on success and false on failure
*
* @access public
*/
function sql_query($query = '', $cache_ttl = 0)
{
if ($query != '')
{
global $cache;
// EXPLAIN only in extra debug mode
if (defined('DEBUG_EXTRA'))
{
$this->sql_report('start', $query);
}
$this->query_result = ($cache_ttl && method_exists($cache, 'sql_load')) ? $cache->sql_load($query) : false;
$this->sql_add_num_queries($this->query_result);
if ($this->query_result === false)
{
if (($this->query_result = @sqlite_query($query, $this->db_connect_id)) === false)
{
$this->sql_error($query);
}
if (defined('DEBUG_EXTRA'))
{
$this->sql_report('stop', $query);
}
if ($cache_ttl && method_exists($cache, 'sql_save'))
{
$this->open_queries[(int) $this->query_result] = $this->query_result;
$cache->sql_save($query, $this->query_result, $cache_ttl);
}
else if (strpos($query, 'SELECT') === 0 && $this->query_result)
{
$this->open_queries[(int) $this->query_result] = $this->query_result;
}
}
else if (defined('DEBUG_EXTRA'))
{
$this->sql_report('fromcache', $query);
}
}
else
{
return false;
}
return $this->query_result;
}
/**
* Build LIMIT query
*/
function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
{
$this->query_result = false;
// if $total is set to 0 we do not want to limit the number of rows
if ($total == 0)
{
$total = -1;
}
$query .= "\n LIMIT " . ((!empty($offset)) ? $offset . ', ' . $total : $total);
return $this->sql_query($query, $cache_ttl);
}
/**
* Return number of affected rows
*/
function sql_affectedrows()
{
return ($this->db_connect_id) ? @sqlite_changes($this->db_connect_id) : false;
}
/**
* Fetch current row
*/
function sql_fetchrow($query_id = false)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if (isset($cache->sql_rowset[$query_id]))
{
return $cache->sql_fetchrow($query_id);
}
return ($query_id !== false) ? @sqlite_fetch_array($query_id, SQLITE_ASSOC) : false;
}
/**
* Seek to given row number
* rownum is zero-based
*/
function sql_rowseek($rownum, &$query_id)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if (isset($cache->sql_rowset[$query_id]))
{
return $cache->sql_rowseek($rownum, $query_id);
}
return ($query_id !== false) ? @sqlite_seek($query_id, $rownum) : false;
}
/**
* Get last inserted id after insert statement
*/
function sql_nextid()
{
return ($this->db_connect_id) ? @sqlite_last_insert_rowid($this->db_connect_id) : false;
}
/**
* Free sql result
*/
function sql_freeresult($query_id = false)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if (isset($cache->sql_rowset[$query_id]))
{
return $cache->sql_freeresult($query_id);
}
return true;
}
/**
* Escape string used in sql query
*/
function sql_escape($msg)
{
return @sqlite_escape_string($msg);
}
/**
* Correctly adjust LIKE expression for special characters
* For SQLite an underscore is a not-known character... this may change with SQLite3
*/
function sql_like_expression($expression)
{
// Unlike LIKE, GLOB is case sensitive (unfortunatly). SQLite users need to live with it!
// We only catch * and ? here, not the character map possible on file globbing.
$expression = str_replace(array(chr(0) . '_', chr(0) . '%'), array(chr(0) . '?', chr(0) . '*'), $expression);
$expression = str_replace(array('?', '*'), array("\?", "\*"), $expression);
$expression = str_replace(array(chr(0) . "\?", chr(0) . "\*"), array('?', '*'), $expression);
return 'GLOB \'' . $this->sql_escape($expression) . '\'';
}
/**
* return sql error array
* @access private
*/
function _sql_error()
{
return array(
'message' => @sqlite_error_string(@sqlite_last_error($this->db_connect_id)),
'code' => @sqlite_last_error($this->db_connect_id)
);
}
/**
* Build db-specific query data
* @access private
*/
function _sql_custom_build($stage, $data)
{
return $data;
}
/**
* Close sql connection
* @access private
*/
function _sql_close()
{
return @sqlite_close($this->db_connect_id);
}
/**
* Build db-specific report
* @access private
*/
function _sql_report($mode, $query = '')
{
switch ($mode)
{
case 'start':
break;
case 'fromcache':
$endtime = explode(' ', microtime());
$endtime = $endtime[0] + $endtime[1];
$result = @sqlite_query($query, $this->db_connect_id);
while ($void = @sqlite_fetch_array($result, SQLITE_ASSOC))
{
// Take the time spent on parsing rows into account
}
$splittime = explode(' ', microtime());
$splittime = $splittime[0] + $splittime[1];
$this->sql_report('record_fromcache', $query, $endtime, $splittime);
break;
}
}
}
?>
|
