The PDOStatement class

I don't know why PDOStatement don't return "execution time" and "found rows" so here I created an extended class of PDOStatement with these attributes.
Just have to "setAttribute" of PDO's object to $PDO->setAttribute(\PDO::ATTR_STATEMENT_CLASS , ['\customs\PDOStatement', [&$this]]);
<?php
/**
*
*
*
*/
namespace customs;
/**
*
*
*
*/
final class PDOStatement extends \PDOStatement {
 /**
 *
 *
 *
 */
 protected $PDO = null;
 protected $inputParams = [];
 protected $executionTime = 0;
 protected $resultCount = 0;
 /**
 *
 *
 *
 */
 protected function __construct(PDO &$PDO) {
 $this->PDO = $PDO;
 $this->executionTime = microtime(true);
 }
 /**
 *
 *
 *
 */
 final public function getExecutionError(int $i = 2) {
 $executionError = $this->errorInfo();
 if (isset($executionError[$i]))
 return $executionError[$i];
 return $executionError;
 }
 /**
 *
 *
 *
 */
 final public function getExecutionTime($numberFormat = false, $decPoint = '.', $thousandsSep = ',') {
 if (is_numeric($numberFormat))
 return number_format($this->executionTime, $numberFormat, $decPoint, $thousandsSep);
 
 return $this->executionTime;
 }
 /**
 *
 *
 *
 */
 final public function getResultCount($numberFormat = false, $decPoint = '.', $thousandsSep = ',') {
 if (is_numeric($numberFormat))
 return number_format($this->resultCount, $numberFormat, $decPoint, $thousandsSep);
 
 return $this->resultCount;
 }
 /**
 *
 *
 *
 */
 final public function getLastInsertId() {
 return $this->PDO->lastInsertId();
 }
 /**
 *
 *
 *
 */
 final public function bindValues(array $inputParams) {
 foreach ($this->inputParams = array_values($inputParams) as $i => $value) {
 $varType = is_null($value) ? \PDO::PARAM_NULL : is_bool($value) ? \PDO::PARAM_BOOL : is_int($value) ? \PDO::PARAM_INT : \PDO::PARAM_STR;
 if (!$this->bindValue(++ $i, $value, $varType))
 return false;
 }
 return true;
 }
 /**
 *
 *
 *
 */
 final public function execute($inputParams = null) {
 if ($inputParams)
 $this->inputParams = $inputParams;
 if ($executed = parent::execute($inputParams))
 $this->executionTime = microtime(true) - $this->executionTime;
 return $executed;
 }
 /**
 *
 *
 *
 */
 final public function fetchAll($how = null, $className = null, $ctorArgs = null) {
 $resultSet = parent::fetchAll(... func_get_args());
 if (!empty($resultSet)) {
 $queryString = $this->queryString;
 $inputParams = $this->inputParams;
 if (preg_match('/(.*)?LIMIT/is', $queryString, $match))
 $queryString = $match[1];
 $queryString = sprintf('SELECT COUNT(*) AS T FROM (%s) DT', $queryString);
 if (($placeholders = substr_count($queryString, '?')) < count($inputParams))
 $inputParams = array_slice($inputParams, 0, $placeholders);
 if (($sth = $this->PDO->prepare($queryString)) && $sth->bindValues($inputParams) && $sth->execute())
 $this->resultCount = $sth->fetchColumn();
 
 $sth = null;
 }
 return $resultSet;
 }
}
?>

I think I found a way to execute a protected SQL query and at the same time find out the number of affected records.
I have the table 'tbl_users' with the following fields: id, login, password, age
<?
const DB_DRIVER = "mysql";
const DB_HOST = "localhost";
const DB_NAME = "my_db_name";
const DB_LOGIN = "root";
const DB_PASS = "root"; //OpenServer.
$connectionString = DB_DRIVER.':host='.DB_HOST.';dbname='.DB_NAME;
try
{
 //Connect to database.
 $db = new PDO($connectionString, DB_LOGIN, DB_PASS);
}
catch(PDOException $e)
{
 die("Error: ".$e->getMessage());
}
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
try
{
 
 //Decreasing age for user 'nick1'.
 $prep1 = $db->prepare("UPDATE tbl_users SET age=age-1 WHERE login='nick1'");
 //Increasing age for user 'nick2'.
 $prep2 = $db->prepare("UPDATE tbl_users SET \r\n age=age+1 WHERE login='nick2'");
 //Start transaction.
 $db->beginTransaction(); //Table type must be InnerDB!
 //We assume that everything will be fine.
 $flagDone = true; 
 //The exec() method returns the number of rows affected by the query.
 //$prep1->queryString is already an escaped SQL string.
 $result = $db->exec($prep1->queryString);
 if($result==false || $result!=1) //var_dump($result) - int(1) or bool(false).
 $flagDone = false;
 $result = $db->exec($prep2->queryString);
 if($result==false || $result!=1)
 $flagDone = false;
 if($flagDone)
 {
 if($db->commit())
 echo "Transaction was successful";
 } 
 else{
 echo "Transaction fail";
 $db->rollback();
 }
 echo "<br>";
}
catch(PDOException $e)
{
 die("Error: ".$e->getMessage());
}