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Bug #34001 truncating value when optional display width value is used
Submitted: 2005-08-05 02:36 UTC Modified: 2005-09-01 03:57 UTC
From: james at safesearching dot com Assigned: iliaa (profile)
Status: Closed Package: PDO related
PHP Version: 5.1.0b3 OS: *
Private report: No CVE-ID: None
View Developer Edit
 [2005-08-05 02:36 UTC] james at safesearching dot com 
Description:
------------
PDO seems to be trucating the value from MySQL when using the optional display width syntax (ie, mediumint(4)).

From http://dev.mysql.com/doc/mysql/en/numeric-types.html

<quote>
...

The display width does not constrain the range of values that can be stored in the column, nor the number of digits that are displayed for values having a width exceeding that specified for the column. 
</quote>

I'm not sure if that is the goal of PDO here is to acutally constrain the display width, since I occasionally get junk characters after the specified length.

ie:
+-----------------+
| id mediumint(4) |
+-----------------+
| 123456          |
+-----------------+

value from PDO is '1234', but sometimes is '1234?d' or other junk characters.

Reproduce code:
---------------
$c = new PDO(
    "mysql:dbname=test;host=localhost", '***', '***'
);

// mysql mediumint
// bytes: 3
// minimum: -8388608 / 0
// maximum: 8388607  / 16777215

$c->exec('CREATE TABLE IF NOT EXISTS foo (id mediumint(4), primary key (id));');
$c->exec("INSERT INTO foo VALUES (12345);");
$c->exec("INSERT INTO foo VALUES (1234567);");

$stmt = $c->prepare("SELECT * FROM foo");

$stmt->execute();

print_r($stmt->fetchAll());

Expected result:
----------------
Array
(
    [0] => Array
        (
            [id] => 12345
            [0] => 12345
        )

    [1] => Array
        (
            [id] => 1234567
            [0] => 1234567
        )

)


Actual result:
--------------
Array
(
    [0] => Array
        (
            [id] => 1234
            [0] => 1234
        )

    [1] => Array
        (
            [id] => 1234
            [0] => 1234
        )

)

--- or sometimes ----

Array
(
    [0] => Array
        (
            [id] => 1234?
            [0] => 1234?
        )

    [1] => Array
        (
            [id] => 1234?dL
            [0] => 1234?dL
        )

)

Patches

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 [2005-08-10 04:01 UTC] james at safesearching dot com 
Tested php5-200508100030, and the junk character issue seems to be resolved, but values from the database are still being truncated.
 [2005-08-10 10:52 UTC] sniper@php.net 
Is the truncating supposed to happen?
 [2005-08-30 01:09 UTC] iliaa@php.net 
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

The pdo_mysql driver does not truncate any data, if it does occur it is done by myself itself.
 [2005-08-30 23:08 UTC] james at safesearching dot com 
MySQL isn't doing any truncating:


Reproduce code:
---------------
<?php

$c = new PDO(
   "mysql:dbname=test;host=localhost",
   '***',
   '***'
);

$c->exec('CREATE TABLE IF NOT EXISTS foo (id mediumint(4), primary key (id));');
$c->exec("INSERT INTO foo VALUES (6234567);");

$stmt = $c->prepare("SELECT * FROM foo");

$stmt->execute();

print_r($stmt->fetchAll());

$c = mysql_connect('localhost', '***', '***');

mysql_select_db('test');

$r = mysql_query("SELECT * FROM foo");

while ($a = mysql_fetch_array($r))
        print_r($a);

?>

Actual result:
--------------
Array
(
    [0] => Array
        (
            [id] => 6234
            [0] => 6234
        )

)
Array
(
    [0] => 6234567
    [id] => 6234567
)

Comments:
---------
If MySQL was truncating the data, then the results should be the same for both APIs.
 [2005-08-31 07:28 UTC] sniper@php.net 
Ilia: 1) don't use the "quick fix" all the time when you just have some short comment to add. 2) Why PDO differs with the "normal" api? :)
 [2005-09-01 03:57 UTC] iliaa@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.
 
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