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Bug #53651 Under mysqlnd, mysqli_affected_rows() returns 0
Submitted: 2011-01-04 19:08 UTC Modified: 2011-01-05 13:59 UTC
From: marc at phpmyadmin dot net Assigned: mysql (profile)
Status: Closed Package: MySQLi related
PHP Version: 5.3.4 OS: Linux
Private report: No CVE-ID: None
 [2011-01-04 19:08 UTC] marc at phpmyadmin dot net
Description:
------------
In PHP 5.3.4 (also 5.3.3 and 5.3.2), connecting to MySQL 5.1.49 with mysqli extension under mysqlnd, I always obtain 0 as the result of mysqli_affected_rows() following an UPDATE that changed one row.

Works fine under PHP 5.2.14 + MySQL 5.1.49 client library.

Thanks,
Marc Delisle

Test script:
---------------
<?php
$link = mysqli_init();

mysqli_real_connect($link, 'localhost', 'user', 'password', 'db');

/*
 * CREATE TABLE mytable (id int not null, myname varchar(50 not null)) engine=MyISAM;
 * INSERT INTO mytable (id, myname) values(1, 'toto');
 */

mysqli_query($link, "update mytable set myname='Marc' where id=1");

printf("Affected rows (UPDATE): %d\n", mysqli_affected_rows($link));

mysqli_close($link);

?>

Expected result:
----------------
Affected rows (UPDATE): 1

Actual result:
--------------
Affected rows (UPDATE): 0

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 [2011-01-05 10:15 UTC] uw@php.net
-Assigned To: +Assigned To: mysql
 [2011-01-05 10:31 UTC] andrey@php.net
-Status: Assigned +Status: Feedback
 [2011-01-05 10:31 UTC] andrey@php.net
I can't reproduce it. Maybe it's bogus due to something else. Here are my results :

myslqnd + MySQL 5.5.8 (executed twice in a row)

andrey@poohie:/work/vanilla/php/php-src/branches/PHP_5_3$ ./php b.php
Affected rows (UPDATE): 1
andrey@poohie:/work/vanilla/php/php-src/branches/PHP_5_3$ ./php b.php
Affected rows (UPDATE): 0

myslqnd + MySQL 5.1-dev (executed twice in a row)
andrey@poohie:/work/vanilla/php/php-src/branches/PHP_5_3$ ./php b.php
Affected rows (UPDATE): 1
andrey@poohie:/work/vanilla/php/php-src/branches/PHP_5_3$ ./php b.php
Affected rows (UPDATE): 0

As you see, the second time the result is 0. Why? It is a feature or gotcha of MySQL. If the row doesn't change affected_rows is 0. And the row doesn't change from toto to toto there is no change, thus the row is left intact.
 [2011-01-05 12:00 UTC] marc at phpmyadmin dot net
-Status: Feedback +Status: Assigned
 [2011-01-05 12:00 UTC] marc at phpmyadmin dot net
Hi Andrey,
here is my configuration, maybe the presence of PDO has an impact?

./configure --with-apxs2=/usr/local/apache2/bin/apxs \
        --with-libdir=lib64 \
        --disable-debug \
        --enable-calendar \
        --with-gd=shared \
        --with-freetype-dir \
        --with-mysql=shared,mysqlnd \
        --with-mysqli=shared,mysqlnd \
        --with-regex=php \
        --with-png-dir=/usr/lib \
        --with-zlib=shared \
        --with-iconv=shared \
        --enable-ftp \
        --with-mcrypt=shared \
        --with-bz2=shared \
        --enable-zip \
        --with-jpeg-dir=/usr/lib \
        --enable-mbstring \
        --without-sqlite \
        --enable-dom \
        --enable-json \
        --enable-pdo=shared \
        --with-pdo-mysql=shared,mysqlnd \
        --without-pdo-sqlite \
        --with-pear \
        --enable-spl \
        --enable-bcmath \
        --with-curl=shared \
        --with-ldap=shared,/usr \
        --with-gettext=shared \
        --with-snmp=shared \
        --enable-sockets
 [2011-01-05 12:08 UTC] andrey@php.net
-Status: Assigned +Status: Feedback
 [2011-01-05 12:08 UTC] andrey@php.net
Can you post output from the script with freshly created table and freshly inserted row. Please, run the script twice. Thanks!
 [2011-01-05 12:28 UTC] marc at phpmyadmin dot net
-Status: Feedback +Status: Assigned
 [2011-01-05 12:28 UTC] marc at phpmyadmin dot net
Andrey,
I had a permission problem at MySQL level that produced the "0" output. Now I can no longer reproduce the problem with the test script, but I still have this problem in phpMyAdmin. I'll try to come up with a new test script.
 [2011-01-05 13:34 UTC] uw@php.net
No, neither adding PDO nor the moon phase can impact it.
 [2011-01-05 13:59 UTC] marc at phpmyadmin dot net
-Status: Assigned +Status: Closed
 [2011-01-05 13:59 UTC] marc at phpmyadmin dot net
Sorry for the disturbance.
 
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