entrinsic performance value of database expression

this works ---->>>

        function good_query($string, $debug=0)
        {
               mysql_connect("127.0.0.1", "root", "thanksrob") or die(mysql_error());
        mysql_select_db("oxwall2") or die(mysql_error());
        if ($debug == 1)
        print $string;
        if ($debug == 2)
        error_log($string);
        $result = mysql_query($string);
        if ($result == false)
        {
        error_log("SQL error: ".mysql_error()."\n\nOriginal query: $string\n");
        // Remove following line from production servers
        die("SQL error: ".mysql_error()."\b<br>\n<br>Original query: $string \n<br>\n        <br>");
        }
        return $result;
        }
                function good_query_table($sql, $debug=0)
        {
         // this function require presence of good_query() function
         $result = good_query($sql, $debug);

         $table = array();
         if (mysql_num_rows($result) > 0)
         {
         $i = 0;
         while($table[$i] = mysql_fetch_assoc($result))
            $i++;
         unset($table[$i]);
         }
         mysql_free_result($result);
         return $table;
        }

this also works -------->>>
$hostDb='mysql:host=127.0.0.1;port=3306;dbname=oxwall2';
                 $user='root';
                 $password='thanksrob';

$ZTH = $DBH -> prepare( "INSERT INTO bot SET id=:id, bot=:bot, username=:user, port=:port, pass=:botpass ON DUPLICATE KEY UPDATE id=:id, bot=:bot, username=:user, port=:port, pass=:botpass");
         $what = OW::getUser()->getUserObject()->getUsername();
                 $bot = "bnc";
                 $ZTH->bindParam(':id', $num, PDO::PARAM_STR);
                 $ZTH->bindParam(':bot', $bot, PDO::PARAM_STR);
                 $ZTH->bindParam(':user', $what, PDO::PARAM_STR);
                 $ZTH->bindParam(':port', $port, PDO::PARAM_STR);
                 $ZTH->bindParam(':botpass', $pass, PDO::PARAM_STR);
                 $ZTH->bindParam(':parameter', $what, PDO::PARAM_STR);
         $ZTH -> execute();
         $result = $ZTH -> fetch();