Your IP : 3.145.167.199
<?php
class CPerfQueryStat
{
public static function IsBanned($table, $columns)
{
global $DB;
$rs = $DB->Query("
select *
from b_perf_index_ban
where TABLE_NAME = '" . $DB->ForSql($table) . "'
AND COLUMN_NAMES = '" . $DB->ForSql($columns) . "'
");
return is_array($rs->Fetch());
}
public static function Ban($table, $columns)
{
global $DB;
$DB->Add('b_perf_index_ban', [
'BAN_TYPE' => 'A',
'TABLE_NAME' => $table,
'COLUMN_NAMES' => $columns,
]);
}
public static function GetTableColumns($table)
{
global $DB;
static $cache = [];
$table = trim($table, '`');
if (!array_key_exists($table, $cache))
{
$strSql = 'SHOW COLUMNS FROM `' . $DB->ForSql($table) . '`';
$rs = $DB->Query($strSql);
$arResult = [];
while ($ar = $rs->Fetch())
{
$arResult[$ar['Field']] = $ar;
}
$cache[$table] = $arResult;
}
return $cache[$table];
}
/**
* @param string $table
* @param array $columns
* @param CPerfQuery $q
* @return bool
*/
public static function GatherExpressStat($table, $columns, $q)
{
$arColumns = explode(',', $columns);
if (count($arColumns) != 1)
{
return false;
}
$column = trim($arColumns[0], '`');
$value = trim($q->find_value($table, $arColumns[0]), "'");
if ($value === '')
{
return false;
}
$tab = new CPerfomanceTable;
$tab->Init($table);
if ($tab->IsExists())
{
$arTableColumns = CPerfQueryStat::GetTableColumns($table);
if (!array_key_exists($column, $arTableColumns))
{
return false; //May be it is worth to ban
}
if ($arTableColumns[$column]['Type'] === 'char(1)')
{
if (is_array(CPerfQueryStat::_get_stat($table, $arColumns[0])))
{
return true;
}
if (CPerfQueryStat::_gather_stat($table, $arColumns[0], $value, 10 * 1024 * 1024))
{
return true;
}
}
return false;
}
else
{
return false;
}
}
public static function GatherColumnStatByValue($table, $column, $value)
{
$tab = new CPerfomanceTable;
$tab->Init($table);
if ($tab->IsExists())
{
$arStat = CPerfQueryStat::_get_stat($table, $column, $value);
if (!is_array($arStat))
{
CPerfQueryStat::_gather_stat($table, $column, $value, -1);
$arStat = CPerfQueryStat::_get_stat($table, $column, $value);
}
return $arStat;
}
else
{
return false;
}
}
public static function GatherColumnStatOverall($table, $column)
{
$tab = new CPerfomanceTable;
$tab->Init($table);
if ($tab->IsExists())
{
$arStat = CPerfQueryStat::_get_stat($table, $column, null);
if (!is_array($arStat))
{
CPerfQueryStat::_gather_stat($table, $column, null, -1);
$arStat = CPerfQueryStat::_get_stat($table, $column, null);
}
return $arStat;
}
else
{
return false;
}
}
public static function GatherTableStat($table)
{
global $DB;
$table = trim($table, '`');
$arStat = CPerfQueryStat::_get_stat($table);
if (!$arStat)
{
$rs = $DB->Query("show table status like '" . $DB->ForSql($table) . "'");
$arDBStat = $rs->Fetch();
$DB->Add('b_perf_tab_stat', $arStat = [
'TABLE_NAME' => $table,
'TABLE_SIZE' => $arDBStat['Data_length'],
'TABLE_ROWS' => $arDBStat['Rows'],
]);
}
return $arStat;
}
protected static function _gather_stat($table, $column, $value, $max_size = -1)
{
global $DB;
$table = trim($table, '`');
$column = trim($column, '`');
$arStat = CPerfQueryStat::GatherTableStat($table);
if ($max_size < 0 || $arStat['TABLE_SIZE'] < $max_size)
{
$table = preg_replace('/[^A-Za-z0-9%_]+/i', '', $table);
$column = preg_replace('/[^A-Za-z0-9%_]+/i', '', $column);
if (isset($value))
{
$rs = $DB->Query('
select count(1) CNT
from ' . $DB->ForSql($table) . '
where `' . $DB->ForSql($column) . "` = '" . $DB->ForSql($value) . "'
");
}
else
{
$rs = $DB->Query('
select count(distinct `' . $DB->ForSql($column) . '`) CNT
from ' . $DB->ForSql($table) . '
');
}
if ($ar = $rs->Fetch())
{
$DB->Add('b_perf_tab_column_stat', [
'TABLE_NAME' => $table,
'COLUMN_NAME' => $column,
'TABLE_ROWS' => $arStat['TABLE_ROWS'],
'COLUMN_ROWS' => $ar['CNT'],
'VALUE' => $value ?? false,
]);
}
return true;
}
else
{
return false;
}
}
protected static function _get_stat($table, $column = '', $value = '')
{
global $DB;
$table = trim($table, '`');
$column = trim($column, '`');
if ($column === '')
{
$rs = $DB->Query("
select *
from b_perf_tab_stat
where TABLE_NAME = '" . $DB->ForSql($table) . "'
");
}
else
{
if (isset($value))
{
$where = ($value === '' ? '' : "AND VALUE = '" . $DB->ForSql($value, 100) . "'");
}
else
{
$where = 'AND VALUE IS NULL';
}
$rs = $DB->Query("
select *
from b_perf_tab_column_stat
where TABLE_NAME = '" . $DB->ForSql($table) . "'
AND COLUMN_NAME = '" . $DB->ForSql($column) . "'
" . $where . '
');
}
return $rs->Fetch();
}
public static function IsSelective($table, $columns)
{
global $DB;
$arColumns = explode(',', $columns);
if (count($arColumns) != 1)
{
return false;
}
$arColumns = array_map([$DB, 'ForSQL'], $arColumns);
$rs = $DB->Query("
select max(TABLE_ROWS) TABLE_ROWS, max(COLUMN_ROWS) COLUMN_ROWS
from b_perf_tab_column_stat
where TABLE_NAME = '" . $DB->ForSql($table) . "'
AND COLUMN_NAME in ('" . implode("','", $arColumns) . "')
");
$ar = $rs->Fetch();
if ($ar && $ar['TABLE_ROWS'] > 0)
{
return $ar['COLUMN_ROWS'] / $ar['TABLE_ROWS'] > 0.05;
}
else
{
return false;
}
}
}