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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;
/**
* Database Abstraction Layer
*/
abstract class driver implements driver_interface
{
var $db_connect_id;
var $query_result;
var $return_on_error = false;
var $transaction = false;
var $sql_time = 0;
var $num_queries = array();
var $open_queries = array();
var $curtime = 0;
var $query_hold = '';
var $html_hold = '';
var $sql_report = '';
var $persistency = false;
var $user = '';
var $server = '';
var $dbname = '';
// Set to true if error triggered
var $sql_error_triggered = false;
// Holding the last sql query on sql error
var $sql_error_sql = '';
// Holding the error information - only populated if sql_error_triggered is set
var $sql_error_returned = array();
// Holding transaction count
var $transactions = 0;
// Supports multi inserts?
var $multi_insert = false;
/**
* Current sql layer
*/
var $sql_layer = '';
/**
* Wildcards for matching any (%) or exactly one (_) character within LIKE expressions
*/
var $any_char;
var $one_char;
/**
* Exact version of the DBAL, directly queried
*/
var $sql_server_version = false;
/**
* Constructor
*/
function __construct()
{
$this->num_queries = array(
'cached' => 0,
'normal' => 0,
'total' => 0,
);
// Fill default sql layer based on the class being called.
// This can be changed by the specified layer itself later if needed.
$this->sql_layer = substr(get_class($this), strlen('phpbb\db\driver\\'));
// Do not change this please! This variable is used to easy the use of it - and is hardcoded.
$this->any_char = chr(0) . '%';
$this->one_char = chr(0) . '_';
}
/**
* {@inheritdoc}
*/
public function get_sql_layer()
{
return $this->sql_layer;
}
/**
* {@inheritdoc}
*/
public function get_db_name()
{
return $this->dbname;
}
/**
* {@inheritdoc}
*/
public function get_any_char()
{
return $this->any_char;
}
/**
* {@inheritdoc}
*/
public function get_one_char()
{
return $this->one_char;
}
/**
* {@inheritdoc}
*/
public function get_db_connect_id()
{
return $this->db_connect_id;
}
/**
* {@inheritdoc}
*/
public function get_sql_error_triggered()
{
return $this->sql_error_triggered;
}
/**
* {@inheritdoc}
*/
public function get_sql_error_sql()
{
return $this->sql_error_sql;
}
/**
* {@inheritdoc}
*/
public function get_transaction()
{
return $this->transaction;
}
/**
* {@inheritdoc}
*/
public function get_sql_time()
{
return $this->sql_time;
}
/**
* {@inheritdoc}
*/
public function get_sql_error_returned()
{
return $this->sql_error_returned;
}
/**
* {@inheritdoc}
*/
public function get_multi_insert()
{
return $this->multi_insert;
}
/**
* {@inheritdoc}
*/
public function set_multi_insert($multi_insert)
{
$this->multi_insert = $multi_insert;
}
/**
* {@inheritDoc}
*/
function sql_return_on_error($fail = false)
{
$this->sql_error_triggered = false;
$this->sql_error_sql = '';
$this->return_on_error = $fail;
}
/**
* {@inheritDoc}
*/
function sql_num_queries($cached = false)
{
return ($cached) ? $this->num_queries['cached'] : $this->num_queries['normal'];
}
/**
* {@inheritDoc}
*/
function sql_add_num_queries($cached = false)
{
$this->num_queries['cached'] += ($cached !== false) ? 1 : 0;
$this->num_queries['normal'] += ($cached !== false) ? 0 : 1;
$this->num_queries['total'] += 1;
}
/**
* {@inheritDoc}
*/
function sql_close()
{
if (!$this->db_connect_id)
{
return false;
}
if ($this->transaction)
{
do
{
$this->sql_transaction('commit');
}
while ($this->transaction);
}
foreach ($this->open_queries as $query_id)
{
$this->sql_freeresult($query_id);
}
// Connection closed correctly. Set db_connect_id to false to prevent errors
if ($result = $this->_sql_close())
{
$this->db_connect_id = false;
}
return $result;
}
/**
* {@inheritDoc}
*/
function sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
{
if (empty($query))
{
return false;
}
// Never use a negative total or offset
$total = ($total < 0) ? 0 : $total;
$offset = ($offset < 0) ? 0 : $offset;
return $this->_sql_query_limit($query, $total, $offset, $cache_ttl);
}
/**
* {@inheritDoc}
*/
function sql_fetchrowset($query_id = false)
{
if ($query_id === false)
{
$query_id = $this->query_result;
}
if ($query_id !== false)
{
$result = array();
while ($row = $this->sql_fetchrow($query_id))
{
$result[] = $row;
}
return $result;
}
return false;
}
/**
* {@inheritDoc}
*/
function sql_rowseek($rownum, &$query_id)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if ($cache && $cache->sql_exists($query_id))
{
return $cache->sql_rowseek($rownum, $query_id);
}
if ($query_id === false)
{
return false;
}
$this->sql_freeresult($query_id);
$query_id = $this->sql_query($this->last_query_text);
if ($query_id === false)
{
return false;
}
// We do not fetch the row for rownum == 0 because then the next resultset would be the second row
for ($i = 0; $i < $rownum; $i++)
{
if (!$this->sql_fetchrow($query_id))
{
return false;
}
}
return true;
}
/**
* {@inheritDoc}
*/
function sql_fetchfield($field, $rownum = false, $query_id = false)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if ($query_id !== false)
{
if ($rownum !== false)
{
$this->sql_rowseek($rownum, $query_id);
}
if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
{
return $cache->sql_fetchfield($query_id, $field);
}
$row = $this->sql_fetchrow($query_id);
return (isset($row[$field])) ? $row[$field] : false;
}
return false;
}
/**
* {@inheritDoc}
*/
function sql_like_expression($expression)
{
$expression = utf8_str_replace(array('_', '%'), array("\_", "\%"), $expression);
$expression = utf8_str_replace(array(chr(0) . "\_", chr(0) . "\%"), array('_', '%'), $expression);
return $this->_sql_like_expression('LIKE \'' . $this->sql_escape($expression) . '\'');
}
/**
* {@inheritDoc}
*/
function sql_not_like_expression($expression)
{
$expression = utf8_str_replace(array('_', '%'), array("\_", "\%"), $expression);
$expression = utf8_str_replace(array(chr(0) . "\_", chr(0) . "\%"), array('_', '%'), $expression);
return $this->_sql_not_like_expression('NOT LIKE \'' . $this->sql_escape($expression) . '\'');
}
/**
* {@inheritDoc}
*/
public function sql_case($condition, $action_true, $action_false = false)
{
$sql_case = 'CASE WHEN ' . $condition;
$sql_case .= ' THEN ' . $action_true;
$sql_case .= ($action_false !== false) ? ' ELSE ' . $action_false : '';
$sql_case .= ' END';
return $sql_case;
}
/**
* {@inheritDoc}
*/
public function sql_concatenate($expr1, $expr2)
{
return $expr1 . ' || ' . $expr2;
}
/**
* {@inheritDoc}
*/
function sql_buffer_nested_transactions()
{
return false;
}
/**
* {@inheritDoc}
*/
function sql_transaction($status = 'begin')
{
switch ($status)
{
case 'begin':
// If we are within a transaction we will not open another one, but enclose the current one to not loose data (preventing auto commit)
if ($this->transaction)
{
$this->transactions++;
return true;
}
$result = $this->_sql_transaction('begin');
if (!$result)
{
$this->sql_error();
}
$this->transaction = true;
break;
case 'commit':
// If there was a previously opened transaction we do not commit yet...
// but count back the number of inner transactions
if ($this->transaction && $this->transactions)
{
$this->transactions--;
return true;
}
// Check if there is a transaction (no transaction can happen if
// there was an error, with a combined rollback and error returning enabled)
// This implies we have transaction always set for autocommit db's
if (!$this->transaction)
{
return false;
}
$result = $this->_sql_transaction('commit');
if (!$result)
{
$this->sql_error();
}
$this->transaction = false;
$this->transactions = 0;
break;
case 'rollback':
$result = $this->_sql_transaction('rollback');
$this->transaction = false;
$this->transactions = 0;
break;
default:
$result = $this->_sql_transaction($status);
break;
}
return $result;
}
/**
* {@inheritDoc}
*/
function sql_build_array($query, $assoc_ary = false)
{
if (!is_array($assoc_ary))
{
return false;
}
$fields = $values = array();
if ($query == 'INSERT' || $query == 'INSERT_SELECT')
{
foreach ($assoc_ary as $key => $var)
{
$fields[] = $key;
if (is_array($var) && is_string($var[0]))
{
// This is used for INSERT_SELECT(s)
$values[] = $var[0];
}
else
{
$values[] = $this->_sql_validate_value($var);
}
}
$query = ($query == 'INSERT') ? ' (' . implode(', ', $fields) . ') VALUES (' . implode(', ', $values) . ')' : ' (' . implode(', ', $fields) . ') SELECT ' . implode(', ', $values) . ' ';
}
else if ($query == 'MULTI_INSERT')
{
trigger_error('The MULTI_INSERT query value is no longer supported. Please use sql_multi_insert() instead.', E_USER_ERROR);
}
else if ($query == 'UPDATE' || $query == 'SELECT' || $query == 'DELETE')
{
$values = array();
foreach ($assoc_ary as $key => $var)
{
$values[] = "$key = " . $this->_sql_validate_value($var);
}
$query = implode(($query == 'UPDATE') ? ', ' : ' AND ', $values);
}
return $query;
}
/**
* {@inheritDoc}
*/
function sql_in_set($field, $array, $negate = false, $allow_empty_set = false)
{
if (!sizeof($array))
{
if (!$allow_empty_set)
{
// Print the backtrace to help identifying the location of the problematic code
$this->sql_error('No values specified for SQL IN comparison');
}
else
{
// NOT IN () actually means everything so use a tautology
if ($negate)
{
return '1=1';
}
// IN () actually means nothing so use a contradiction
else
{
return '1=0';
}
}
}
if (!is_array($array))
{
$array = array($array);
}
if (sizeof($array) == 1)
{
@reset($array);
$var = current($array);
return $field . ($negate ? ' <> ' : ' = ') . $this->_sql_validate_value($var);
}
else
{
return $field . ($negate ? ' NOT IN ' : ' IN ') . '(' . implode(', ', array_map(array($this, '_sql_validate_value'), $array)) . ')';
}
}
/**
* {@inheritDoc}
*/
function sql_bit_and($column_name, $bit, $compare = '')
{
if (method_exists($this, '_sql_bit_and'))
{
return $this->_sql_bit_and($column_name, $bit, $compare);
}
return $column_name . ' & ' . (1 << $bit) . (($compare) ? ' ' . $compare : '');
}
/**
* {@inheritDoc}
*/
function sql_bit_or($column_name, $bit, $compare = '')
{
if (method_exists($this, '_sql_bit_or'))
{
return $this->_sql_bit_or($column_name, $bit, $compare);
}
return $column_name . ' | ' . (1 << $bit) . (($compare) ? ' ' . $compare : '');
}
/**
* {@inheritDoc}
*/
function cast_expr_to_bigint($expression)
{
return $expression;
}
/**
* {@inheritDoc}
*/
function cast_expr_to_string($expression)
{
return $expression;
}
/**
* {@inheritDoc}
*/
function sql_lower_text($column_name)
{
return "LOWER($column_name)";
}
/**
* {@inheritDoc}
*/
function sql_multi_insert($table, $sql_ary)
{
if (!sizeof($sql_ary))
{
return false;
}
if ($this->multi_insert)
{
$ary = array();
foreach ($sql_ary as $id => $_sql_ary)
{
// If by accident the sql array is only one-dimensional we build a normal insert statement
if (!is_array($_sql_ary))
{
return $this->sql_query('INSERT INTO ' . $table . ' ' . $this->sql_build_array('INSERT', $sql_ary));
}
$values = array();
foreach ($_sql_ary as $key => $var)
{
$values[] = $this->_sql_validate_value($var);
}
$ary[] = '(' . implode(', ', $values) . ')';
}
return $this->sql_query('INSERT INTO ' . $table . ' ' . ' (' . implode(', ', array_keys($sql_ary[0])) . ') VALUES ' . implode(', ', $ary));
}
else
{
foreach ($sql_ary as $ary)
{
if (!is_array($ary))
{
return false;
}
$result = $this->sql_query('INSERT INTO ' . $table . ' ' . $this->sql_build_array('INSERT', $ary));
if (!$result)
{
return false;
}
}
}
return true;
}
/**
* Function for validating values
* @access private
*/
function _sql_validate_value($var)
{
if (is_null($var))
{
return 'NULL';
}
else if (is_string($var))
{
return "'" . $this->sql_escape($var) . "'";
}
else
{
return (is_bool($var)) ? intval($var) : $var;
}
}
/**
* {@inheritDoc}
*/
function sql_build_query($query, $array)
{
$sql = '';
switch ($query)
{
case 'SELECT':
case 'SELECT_DISTINCT';
$sql = str_replace('_', ' ', $query) . ' ' . $array['SELECT'] . ' FROM ';
// Build table array. We also build an alias array for later checks.
$table_array = $aliases = array();
$used_multi_alias = false;
foreach ($array['FROM'] as $table_name => $alias)
{
if (is_array($alias))
{
$used_multi_alias = true;
foreach ($alias as $multi_alias)
{
$table_array[] = $table_name . ' ' . $multi_alias;
$aliases[] = $multi_alias;
}
}
else
{
$table_array[] = $table_name . ' ' . $alias;
$aliases[] = $alias;
}
}
// We run the following code to determine if we need to re-order the table array. ;)
// The reason for this is that for multi-aliased tables (two equal tables) in the FROM statement the last table need to match the first comparison.
// DBMS who rely on this: Oracle, PostgreSQL and MSSQL. For all other DBMS it makes absolutely no difference in which order the table is.
if (!empty($array['LEFT_JOIN']) && sizeof($array['FROM']) > 1 && $used_multi_alias !== false)
{
// Take first LEFT JOIN
$join = current($array['LEFT_JOIN']);
// Determine the table used there (even if there are more than one used, we only want to have one
preg_match('/(' . implode('|', $aliases) . ')\.[^\s]+/U', str_replace(array('(', ')', 'AND', 'OR', ' '), '', $join['ON']), $matches);
// If there is a first join match, we need to make sure the table order is correct
if (!empty($matches[1]))
{
$first_join_match = trim($matches[1]);
$table_array = $last = array();
foreach ($array['FROM'] as $table_name => $alias)
{
if (is_array($alias))
{
foreach ($alias as $multi_alias)
{
($multi_alias === $first_join_match) ? $last[] = $table_name . ' ' . $multi_alias : $table_array[] = $table_name . ' ' . $multi_alias;
}
}
else
{
($alias === $first_join_match) ? $last[] = $table_name . ' ' . $alias : $table_array[] = $table_name . ' ' . $alias;
}
}
$table_array = array_merge($table_array, $last);
}
}
$sql .= $this->_sql_custom_build('FROM', implode(' CROSS JOIN ', $table_array));
if (!empty($array['LEFT_JOIN']))
{
foreach ($array['LEFT_JOIN'] as $join)
{
$sql .= ' LEFT JOIN ' . key($join['FROM']) . ' ' . current($join['FROM']) . ' ON (' . $join['ON'] . ')';
}
}
if (!empty($array['WHERE']))
{
$sql .= ' WHERE ' . $this->_sql_custom_build('WHERE', $array['WHERE']);
}
if (!empty($array['GROUP_BY']))
{
$sql .= ' GROUP BY ' . $array['GROUP_BY'];
}
if (!empty($array['ORDER_BY']))
{
$sql .= ' ORDER BY ' . $array['ORDER_BY'];
}
break;
}
return $sql;
}
/**
* {@inheritDoc}
*/
function sql_error($sql = '')
{
global $auth, $user, $config;
// Set var to retrieve errored status
$this->sql_error_triggered = true;
$this->sql_error_sql = $sql;
$this->sql_error_returned = $this->_sql_error();
if (!$this->return_on_error)
{
$message = 'SQL ERROR [ ' . $this->sql_layer . ' ]<br /><br />' . $this->sql_error_returned['message'] . ' [' . $this->sql_error_returned['code'] . ']';
// Show complete SQL error and path to administrators only
// Additionally show complete error on installation or if extended debug mode is enabled
// The DEBUG constant is for development only!
if ((isset($auth) && $auth->acl_get('a_')) || defined('IN_INSTALL') || defined('DEBUG'))
{
$message .= ($sql) ? '<br /><br />SQL<br /><br />' . htmlspecialchars($sql) : '';
}
else
{
// If error occurs in initiating the session we need to use a pre-defined language string
// This could happen if the connection could not be established for example (then we are not able to grab the default language)
if (!isset($user->lang['SQL_ERROR_OCCURRED']))
{
$message .= '<br /><br />An sql error occurred while fetching this page. Please contact an administrator if this problem persists.';
}
else
{
if (!empty($config['board_contact']))
{
$message .= '<br /><br />' . sprintf($user->lang['SQL_ERROR_OCCURRED'], '<a href="mailto:' . htmlspecialchars($config['board_contact']) . '">', '</a>');
}
else
{
$message .= '<br /><br />' . sprintf($user->lang['SQL_ERROR_OCCURRED'], '', '');
}
}
}
if ($this->transaction)
{
$this->sql_transaction('rollback');
}
if (strlen($message) > 1024)
{
// We need to define $msg_long_text here to circumvent text stripping.
global $msg_long_text;
$msg_long_text = $message;
trigger_error(false, E_USER_ERROR);
}
trigger_error($message, E_USER_ERROR);
}
if ($this->transaction)
{
$this->sql_transaction('rollback');
}
return $this->sql_error_returned;
}
/**
* {@inheritDoc}
*/
function sql_report($mode, $query = '')
{
global $cache, $starttime, $phpbb_root_path, $phpbb_path_helper, $user;
global $request;
if (is_object($request) && !$request->variable('explain', false))
{
return false;
}
if (!$query && $this->query_hold != '')
{
$query = $this->query_hold;
}
switch ($mode)
{
case 'display':
if (!empty($cache))
{
$cache->unload();
}
$this->sql_close();
$mtime = explode(' ', microtime());
$totaltime = $mtime[0] + $mtime[1] - $starttime;
echo '<!DOCTYPE html>
<html dir="ltr">
<head>
<meta charset="utf-8">
<title>SQL Report</title>
<link href="' . htmlspecialchars($phpbb_path_helper->update_web_root_path($phpbb_root_path) . $phpbb_path_helper->get_adm_relative_path()) . 'style/admin.css" rel="stylesheet" type="text/css" media="screen" />
</head>
<body id="errorpage">
<div id="wrap">
<div id="page-header">
<a href="' . build_url('explain') . '">Return to previous page</a>
</div>
<div id="page-body">
<div id="acp">
<div class="panel">
<span class="corners-top"><span></span></span>
<div id="content">
<h1>SQL Report</h1>
<br />
<p><b>Page generated in ' . round($totaltime, 4) . " seconds with {$this->num_queries['normal']} queries" . (($this->num_queries['cached']) ? " + {$this->num_queries['cached']} " . (($this->num_queries['cached'] == 1) ? 'query' : 'queries') . ' returning data from cache' : '') . '</b></p>
<p>Time spent on ' . $this->sql_layer . ' queries: <b>' . round($this->sql_time, 5) . 's</b> | Time spent on PHP: <b>' . round($totaltime - $this->sql_time, 5) . 's</b></p>
<br /><br />
' . $this->sql_report . '
</div>
<span class="corners-bottom"><span></span></span>
</div>
</div>
</div>
<div id="page-footer">
Powered by <a href="https://www.phpbb.com/">phpBB</a>® Forum Software © phpBB Limited
</div>
</div>
</body>
</html>';
exit_handler();
break;
case 'stop':
$endtime = explode(' ', microtime());
$endtime = $endtime[0] + $endtime[1];
$this->sql_report .= '
<table cellspacing="1">
<thead>
<tr>
<th>Query #' . $this->num_queries['total'] . '</th>
</tr>
</thead>
<tbody>
<tr>
<td class="row3"><textarea style="font-family:\'Courier New\',monospace;width:99%" rows="5" cols="10">' . preg_replace('/\t(AND|OR)(\W)/', "\$1\$2", htmlspecialchars(preg_replace('/[\s]*[\n\r\t]+[\n\r\s\t]*/', "\n", $query))) . '</textarea></td>
</tr>
</tbody>
</table>
' . $this->html_hold . '
<p style="text-align: center;">
';
if ($this->query_result)
{
if (preg_match('/^(UPDATE|DELETE|REPLACE)/', $query))
{
$this->sql_report .= 'Affected rows: <b>' . $this->sql_affectedrows($this->query_result) . '</b> | ';
}
$this->sql_report .= 'Before: ' . sprintf('%.5f', $this->curtime - $starttime) . 's | After: ' . sprintf('%.5f', $endtime - $starttime) . 's | Elapsed: <b>' . sprintf('%.5f', $endtime - $this->curtime) . 's</b>';
}
else
{
$error = $this->sql_error();
$this->sql_report .= '<b style="color: red">FAILED</b> - ' . $this->sql_layer . ' Error ' . $error['code'] . ': ' . htmlspecialchars($error['message']);
}
$this->sql_report .= '</p><br /><br />';
$this->sql_time += $endtime - $this->curtime;
break;
case 'start':
$this->query_hold = $query;
$this->html_hold = '';
$this->_sql_report($mode, $query);
$this->curtime = explode(' ', microtime());
$this->curtime = $this->curtime[0] + $this->curtime[1];
break;
case 'add_select_row':
$html_table = func_get_arg(2);
$row = func_get_arg(3);
if (!$html_table && sizeof($row))
{
$html_table = true;
$this->html_hold .= '<table cellspacing="1"><tr>';
foreach (array_keys($row) as $val)
{
$this->html_hold .= '<th>' . (($val) ? ucwords(str_replace('_', ' ', $val)) : ' ') . '</th>';
}
$this->html_hold .= '</tr>';
}
$this->html_hold .= '<tr>';
$class = 'row1';
foreach (array_values($row) as $val)
{
$class = ($class == 'row1') ? 'row2' : 'row1';
$this->html_hold .= '<td class="' . $class . '">' . (($val) ? $val : ' ') . '</td>';
}
$this->html_hold .= '</tr>';
return $html_table;
break;
case 'fromcache':
$this->_sql_report($mode, $query);
break;
case 'record_fromcache':
$endtime = func_get_arg(2);
$splittime = func_get_arg(3);
$time_cache = $endtime - $this->curtime;
$time_db = $splittime - $endtime;
$color = ($time_db > $time_cache) ? 'green' : 'red';
$this->sql_report .= '<table cellspacing="1"><thead><tr><th>Query results obtained from the cache</th></tr></thead><tbody><tr>';
$this->sql_report .= '<td class="row3"><textarea style="font-family:\'Courier New\',monospace;width:99%" rows="5" cols="10">' . preg_replace('/\t(AND|OR)(\W)/', "\$1\$2", htmlspecialchars(preg_replace('/[\s]*[\n\r\t]+[\n\r\s\t]*/', "\n", $query))) . '</textarea></td></tr></tbody></table>';
$this->sql_report .= '<p style="text-align: center;">';
$this->sql_report .= 'Before: ' . sprintf('%.5f', $this->curtime - $starttime) . 's | After: ' . sprintf('%.5f', $endtime - $starttime) . 's | Elapsed [cache]: <b style="color: ' . $color . '">' . sprintf('%.5f', ($time_cache)) . 's</b> | Elapsed [db]: <b>' . sprintf('%.5f', $time_db) . 's</b></p><br /><br />';
// Pad the start time to not interfere with page timing
$starttime += $time_db;
break;
default:
$this->_sql_report($mode, $query);
break;
}
return true;
}
/**
* {@inheritDoc}
*/
function get_estimated_row_count($table_name)
{
return $this->get_row_count($table_name);
}
/**
* {@inheritDoc}
*/
function get_row_count($table_name)
{
$sql = 'SELECT COUNT(*) AS rows_total
FROM ' . $this->sql_escape($table_name);
$result = $this->sql_query($sql);
$rows_total = $this->sql_fetchfield('rows_total');
$this->sql_freeresult($result);
return $rows_total;
}
}
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