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<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
namespace phpbb\db\driver;
/**
* SQLite3 Database Abstraction Layer
* Minimum Requirement: 3.6.15+
*/
class sqlite3 extends \phpbb\db\driver\driver
{
/**
* @var string Stores errors during connection setup in case the driver is not available
*/
protected $connect_error = '';
/**
* @var \SQLite3 The SQLite3 database object to operate against
*/
protected $dbo = null;
/**
* {@inheritDoc}
*/
public function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
{
$this->persistency = false;
$this->user = $sqluser;
$this->server = $sqlserver . (($port) ? ':' . $port : '');
$this->dbname = $database;
if (!class_exists('SQLite3', false))
{
$this->connect_error = 'SQLite3 not found, is the extension installed?';
return $this->sql_error('');
}
try
{
$this->dbo = new \SQLite3($this->server, SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE);
$this->db_connect_id = true;
}
catch (\Exception $e)
{
$this->connect_error = $e->getMessage();
return array('message' => $this->connect_error);
}
return true;
}
/**
* {@inheritDoc}
*/
public function sql_server_info($raw = false, $use_cache = true)
{
global $cache;
if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('sqlite_version')) === false)
{
$version = \SQLite3::version();
$this->sql_server_version = $version['versionString'];
if (!empty($cache) && $use_cache)
{
$cache->put('sqlite_version', $this->sql_server_version);
}
}
return ($raw) ? $this->sql_server_version : 'SQLite ' . $this->sql_server_version;
}
/**
* SQL Transaction
*
* @param string $status Should be one of the following strings:
* begin, commit, rollback
* @return bool Success/failure of the transaction query
*/
protected function _sql_transaction($status = 'begin')
{
switch ($status)
{
case 'begin':
return $this->dbo->exec('BEGIN IMMEDIATE');
break;
case 'commit':
return $this->dbo->exec('COMMIT');
break;
case 'rollback':
return $this->dbo->exec('ROLLBACK');
break;
}
return true;
}
/**
* {@inheritDoc}
*/
public function sql_query($query = '', $cache_ttl = 0)
{
if ($query != '')
{
global $cache;
// EXPLAIN only in extra debug mode
if (defined('DEBUG'))
{
$this->sql_report('start', $query);
}
else if (defined('PHPBB_DISPLAY_LOAD_TIME'))
{
$this->curtime = microtime(true);
}
$this->last_query_text = $query;
$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
$this->sql_add_num_queries($this->query_result);
if ($this->query_result === false)
{
if (($this->query_result = @$this->dbo->query($query)) === false)
{
$this->sql_error($query);
}
if (defined('DEBUG'))
{
$this->sql_report('stop', $query);
}
else if (defined('PHPBB_DISPLAY_LOAD_TIME'))
{
$this->sql_time += microtime(true) - $this->curtime;
}
if ($cache && $cache_ttl)
{
$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
}
}
else if (defined('DEBUG'))
{
$this->sql_report('fromcache', $query);
}
}
else
{
return false;
}
return $this->query_result;
}
/**
* Build LIMIT query
*
* @param string $query The SQL query to execute
* @param int $total The number of rows to select
* @param int $offset
* @param int $cache_ttl Either 0 to avoid caching or
* the time in seconds which the result shall be kept in cache
* @return mixed Buffered, seekable result handle, false on error
*/
protected function _sql_query_limit($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, $cache_ttl);
}
/**
* {@inheritDoc}
*/
public function sql_affectedrows()
{
return ($this->db_connect_id) ? $this->dbo->changes() : false;
}
/**
* {@inheritDoc}
*/
public function sql_fetchrow($query_id = false)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
{
return $cache->sql_fetchrow($query_id);
}
return is_object($query_id) ? $query_id->fetchArray(SQLITE3_ASSOC) : false;
}
/**
* {@inheritDoc}
*/
public function sql_nextid()
{
return ($this->db_connect_id) ? $this->dbo->lastInsertRowID() : false;
}
/**
* {@inheritDoc}
*/
public function sql_freeresult($query_id = false)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
{
return $cache->sql_freeresult($query_id);
}
if ($query_id)
{
return @$query_id->finalize();
}
}
/**
* {@inheritDoc}
*/
public function sql_escape($msg)
{
return \SQLite3::escapeString($msg);
}
/**
* {@inheritDoc}
*
* For SQLite an underscore is an unknown character.
*/
public function sql_like_expression($expression)
{
// Unlike LIKE, GLOB is unfortunately case sensitive.
// 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) . '\'';
}
/**
* {@inheritDoc}
*
* For SQLite an underscore is an unknown character.
*/
public function sql_not_like_expression($expression)
{
// Unlike NOT LIKE, NOT GLOB is unfortunately case sensitive
// 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 'NOT GLOB \'' . $this->sql_escape($expression) . '\'';
}
/**
* return sql error array
*
* @return array
*/
protected function _sql_error()
{
if (class_exists('SQLite3', false) && isset($this->dbo))
{
$error = array(
'message' => $this->dbo->lastErrorMsg(),
'code' => $this->dbo->lastErrorCode(),
);
}
else
{
$error = array(
'message' => $this->connect_error,
'code' => '',
);
}
return $error;
}
/**
* Build db-specific query data
*
* @param string $stage Available stages: FROM, WHERE
* @param mixed $data A string containing the CROSS JOIN query or an array of WHERE clauses
*
* @return string The db-specific query fragment
*/
protected function _sql_custom_build($stage, $data)
{
return $data;
}
/**
* Close sql connection
*
* @return bool False if failure
*/
protected function _sql_close()
{
return $this->dbo->close();
}
/**
* Build db-specific report
*
* @param string $mode Available modes: display, start, stop,
* add_select_row, fromcache, record_fromcache
* @param string $query The Query that should be explained
* @return mixed Either a full HTML page, boolean or null
*/
protected function _sql_report($mode, $query = '')
{
switch ($mode)
{
case 'start':
$explain_query = $query;
if (preg_match('/UPDATE ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
{
$explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
}
else if (preg_match('/DELETE FROM ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
{
$explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
}
if (preg_match('/^SELECT/', $explain_query))
{
$html_table = false;
if ($result = $this->dbo->query("EXPLAIN QUERY PLAN $explain_query"))
{
while ($row = $result->fetchArray(SQLITE3_ASSOC))
{
$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
}
}
if ($html_table)
{
$this->html_hold .= '</table>';
}
}
break;
case 'fromcache':
$endtime = explode(' ', microtime());
$endtime = $endtime[0] + $endtime[1];
$result = $this->dbo->query($query);
while ($void = $result->fetchArray(SQLITE3_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;
}
}
}
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