Bug #36144 [Fbk->NoF]: only one row when using persistent connections and unbuffered queries
Edit report at https://bugs.php.net/bug.php?id=36144&edit=1
ID: 36144
Updated by: uw@php.net
Reported by: php at kanariepiet dot com
Summary: only one row when using persistent connections and
unbuffered queries
-Status: Feedback
+Status: No Feedback
Type: Bug
Package: MySQL related
Operating System: Linux
PHP Version: 5.1.2
Assigned To: mysql
Block user comment: N
Private report: N
Previous Comments:
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[2010-11-02 17:31:49] felipe@php.net
Please try using this snapshot:
http://snaps.php.net/php5.3-latest.tar.gz
For Windows:
http://windows.php.net/snapshots/
------------------------------------------------------------------------
[2007-01-04 01:00:00] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
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[2006-12-27 23:43:33] andrey@php.net
Do you still experience this behavior?
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[2006-01-25 10:57:24] sniper@php.net
Assigned to the MySQL support.
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[2006-01-24 15:30:13] php at kanariepiet dot com
Description:
------------
Assume you have a webserver serving two PHP scripts. Both PHP
scripts use persistent MySQL database connections. Script one
uses normal mysql_query calls, script two uses
mysql_unbuffered_query calls.
Also, script one is doing additional mysql_query calls while
retrieving the records of the first mysql_query (yes, an sql
join would be better).
When script two (the one with mysql_unbuffered_query)
finishes, and script one reuses the persistent database
connection of script two, the resource identifier in script
one gets lost after the first loop, resulting in only one
returned row.
get_resource_type($res) should return 'mysql result', but will
return 'Unknown'
Reproduce code:
---------------
Script1.html:
$db = mysql_pconnect ('host', 'user', 'pass');
print ('We are using MySQL thread: '. mysql_thread_id() .'<br />');
$res = mysql_query ("SELECT * FROM temp.documents"); // table with 1200 records
print ('mysql_num_rows() returned '. mysql_num_rows($res) .'<br />');
while ($row = mysql_fetch_assoc ($res)) {
$res2 = mysql_query ("SELECT * FROM temp.attachments WHERE document = ".
$row['id']);
while ($row2 = mysql_fetch_assoc ($res2))
$row['attachments'][] = $row2;
$documents[] = $row;
}
print ('number of documents: '. count ($documents));
Script2.html:
$db = mysql_pconnect ('host', 'user', 'pass');
print ('We are using MySQL thread: '. mysql_thread_id() .'<br />');
$res = mysql_unbuffered_query ("SELECT * FROM temp.documents");
while ($row = mysql_fetch_assoc ($res)) {
}
Expected result:
----------------
Open script2.html and note the thread id.
Keep opening script1.html until the thread id is the same as
the one script2 used.
You should see this:
(script2.html)
We are using MySQL thread: 1439
(script1.html)
We are using MySQL thread: 1439
mysql_num_rows() returned 1200
number of documents: 1200
Actual result:
--------------
However, the output will be:
(script2.html)
We are using MySQL thread: 1439
(script1.html)
We are using MySQL thread: 1439
mysql_num_rows() returned 1200
number of documents: 1
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Edit this bug report at https://bugs.php.net/bug.php?id=36144&edit=1
Thread (7 messages)