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Bug #38380 Large Numbers don't get sent properly in a prepared stmt
Submitted: 2006-08-08 13:28 UTC Modified: 2006-08-08 14:06 UTC
From: khalid at pixelcraze dot com Assigned:
Status: Not a bug Package: MySQLi related
PHP Version: 5.1.4 OS: FC4
Private report: No CVE-ID: None
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From: khalid at pixelcraze dot com
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 [2006-08-08 13:28 UTC] khalid at pixelcraze dot com
Description:
------------
When sending a large number (e.g. 10354520101202315) via a prepared stmt, the end result in MySQL is not correct.

MySQL 4.1.19


Reproduce code:
---------------
CREATE TABLE `test` (`number` bigint(20) NOT NULL default '0') ENGINE=MyISAM DEFAULT CHARSET=latin1

$db = &new MySQLi($host,$user,$pass,$dbname);
$stmt = $db->stmt_init();
$sql = "INSERT INTO test (number) VALUES (?)";
$stmt->prepare($sql);
$stmt->bind_param('d',$number);
$number = 10354520101202315;
$result = $stmt->execute();





Expected result:
----------------
Result in MySQL is 10354520101202316 - it should be 10354520101202315.

If I use a normal INSERT statement, then it works as expected. Changing the bind type to 's' then that works, but I have to change $number to 

$number = '10354520101202315';

Actual result:
--------------
MySQL reports number as 10354520101202316

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 [2006-08-08 14:06 UTC] tony2001@php.net
Floating point values have a limited precision. Hence a value might 
not have the same string representation after any processing. That also
includes writing a floating point value in your script and directly 
printing it without any mathematical operations.

If you would like to know more about "floats" and what IEEE
754 is read this:
http://docs.sun.com/source/806-3568/ncg_goldberg.html
 
Thank you for your interest in PHP.

$number = 10354520101202315; is not int, it's float.
 
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