ID: 11993
User updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
Status: Open
Bug Type: MySQL related
Operating System: Debian 2.19
PHP Version: 4.0.6
New Comment:
hi zak,
thanks for your answer.
in my opinion, php must have some matrix, where you stores the number of connect and
close calls with the connection id. this will probably solve the problem.
ps: i use these multiple connections in oop environment, where a global connection id,
is not the best idea. or?
ati
Previous Comments:
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[2001-07-11 06:58:00] [EMAIL PROTECTED]
Here is a refinement on this bug:
Multiple duplicate calls to mysql_connect are supposed to return the same link ID.
Each call after the first call will only return the link ID of the first (if
everything goes as planned, the connection is still good, etc...).
i.e.
var_dump (mysql_connect() === mysql_connect());
Given this behavior, how should mysql_close() behave?
I would expect that calling mysql_close ($id) would close the connection that both $id
and $id2 refer to.
Behavior is not this - instead it is quite odd...
Multiple calls to mysql_close are required to close multiple duplicate calls to
mysql_connect.
i.e.
var_dump ($db = mysql_connect ());
var_dump ($db = mysql_connect ());
var_dump (mysql_close ($db));
// Maybe this closes the default connection?
var_dump (mysql_close ($db));
However, if more than two calls to mysql_connect are made, followed by a corresponding
number of calls to mysql_close, the mysql_close calls start to fail.
i.e.
$max = 10;
for ($x=0; $x<$max; ++$x) {
var_dump ($db = mysql_connect());
}
for ($x=0; $x<$max; ++$x) {
var_dump (mysql_close ($db));
}
Now, throw change the call to mysql_close($db) to mysql_close() - everything seems to
work as expected.
However as soon as you add a call to mysql_query after the call to mysql_close, the
link will *never* die - no matter how many times you close it.
Finally, put a call to mysql_close ($db) between the two loops. The next call to
mysql_close() will fail with an error, while subsequent calls will succeed - once
again, the link will never die.
Things get even stranger when this behavior is encountered within recursive function
calls - however, I guess that this is a side effect of the behavior described above.
It looks like there is some complex/odd interactions happening with the code that
closes mysql links and the code that sets and uses the default link -- however, this
is quite far over my head!
Anyone else have any ideas? :)
------------------------------------------------------------------------
[2001-07-11 05:07:29] [EMAIL PROTECTED]
Dear Ati,
When you enter a bug report, please make the script that reproduces the error as short
and simple as possible.
I do not believe that the problem that you are encountering is a bug - you just have
too many connections open at once.
Try this script:
<pre>
<?php
error_reporting (0);
function test () {
static $count = 0;
if (++$count < 20) {
echo "Opening $count:";
var_dump ($db = mysql_connect ('localhost:3306', replace_me,
replace_me));
test ();
--$count;
echo "Closing $count:";
var_dump (mysql_close ($db));
}
}
test ();
?>
</pre>
Now try it with mysql_pconnect -- does the error go away? It does for me.
In most cases, you will only need a *single* connection to a mysql database -- not
multiple.
This may still be a bug - two or more calls to mysql_connect with the same arguments
should only result in one connection being opened. Each call will return the same
connection ID.
------------------------------------------------------------------------
[2001-07-10 21:31:02] [EMAIL PROTECTED]
i have tried out with the following configurations:
server1: php-4.0.6/mysql.3.23.32/apache-1.3.20/debian 2.19
server2: php-4.0.6/mysql.3.23.37/apache-1.3.20/debian 2.19
the result is the same as with php-4.0.4pl1
please check this...
thanks
ati
------------------------------------------------------------------------
[2001-07-09 19:22:19] [EMAIL PROTECTED]
debian 2.19 / mysql 3.23.37 / php 4.0.4pl1
configure section of phpinfo():
'./configure' '--with-gd' '--with-jpeg-dir' '--with-png-dir' '--with-tiff-dir'
'--disable-posix' '--enable-ftp' '--enable-calendar' '--with-imap' '--with-mcrypt'
'--with-swf=/usr/local/swf' '--with-apache=/home/atiware/apache_1.3.14'
'--enable-track-vars' '--with-mysql=/usr/local'
the sript that reproduces the problem:
--cut here--
<?php
define("DEEPLIMIT",10); //maximal deep of recursive calls
/*
!! please edit this settings !!
*/
define("MYHOST","localhost");
define("MYPORT","3306");
define("MYUSER","YOUR_USERNAME");
define("MYPWD","YOUR_PASSWORD");
/* this function reproduces the error */
function recursive($deep,$persistent=false) {
if ($deep<=DEEPLIMIT) {
//down side
if ($persistent)
$db=mysql_pconnect(MYHOST.":".MYPORT,MYUSER,MYPWD);
//creating persistent mysql connection and storing in a local variable
else
$db=mysql_connect(MYHOST.":".MYPORT,MYUSER,MYPWD);
//creating mysql connection and storing in a local variable
$res=@mysql_query("select 1 as ONE",$db); //some dummy query
$mr=null;
if (@mysql_num_rows($res)) {
$mr=@mysql_fetch_array($res);
}
//and now write the result
printf("%sRecursive: Deep: %s, DownSideQuery:
%s<br>\n",str_repeat(">",$deep),$deep,(int)$mr["ONE"]);
recursive($deep+1,$persistent);
//up side
$res=@mysql_query("select 1 as ONE",$db); //using previously
created connection ($db), if exists ;)
$mr=null;
if (@mysql_num_rows($res)) {
$mr=@mysql_fetch_array($res);
}
//write result again
printf("%sRecursive: Deep: %s, UpSideQuery:
%s",str_repeat(">",$deep),$deep,(int)$mr["ONE"]);
//error check
if (!(int)$mr["ONE"])
printf(" <b>!?ERROR!? why 0?</b>");
printf("<br>\n");
@mysql_close($db); //closing mysql connection
}
else {
printf("Limit occured (%s). Turning back...<br>\n",DEEPLIMIT);
}
}
echo "Trying with <b>mysql_connect()</b><br>\n";
recursive(1);
echo "<br><br>\n\n";
echo "Trying with <b>mysql_pconnect()</b><br>\n";
recursive(1,true);
?>
--cut here--
the output of the script:
Trying with mysql_connect()
>Recursive: Deep: 1, DownSideQuery: 1
>>Recursive: Deep: 2, DownSideQuery: 1
>>>Recursive: Deep: 3, DownSideQuery: 1
>>>>Recursive: Deep: 4, DownSideQuery: 1
>>>>>Recursive: Deep: 5, DownSideQuery: 1
>>>>>>Recursive: Deep: 6, DownSideQuery: 1
>>>>>>>Recursive: Deep: 7, DownSideQuery: 1
>>>>>>>>Recursive: Deep: 8, DownSideQuery: 1
>>>>>>>>>Recursive: Deep: 9, DownSideQuery: 1
>>>>>>>>>>Recursive: Deep: 10, DownSideQuery: 1
Limit occured (10). Turning back...
>>>>>>>>>>Recursive: Deep: 10, UpSideQuery: 1
>>>>>>>>>Recursive: Deep: 9, UpSideQuery: 1
>>>>>>>>Recursive: Deep: 8, UpSideQuery: 1
>>>>>>>Recursive: Deep: 7, UpSideQuery: 1
>>>>>>Recursive: Deep: 6, UpSideQuery: 1
>>>>>Recursive: Deep: 5, UpSideQuery: 0 !?ERROR!? why 0?
>>>>Recursive: Deep: 4, UpSideQuery: 0 !?ERROR!? why 0?
>>>Recursive: Deep: 3, UpSideQuery: 0 !?ERROR!? why 0?
>>Recursive: Deep: 2, UpSideQuery: 0 !?ERROR!? why 0?
>Recursive: Deep: 1, UpSideQuery: 0 !?ERROR!? why 0?
Trying with mysql_pconnect()
>Recursive: Deep: 1, DownSideQuery: 1
>>Recursive: Deep: 2, DownSideQuery: 1
>>>Recursive: Deep: 3, DownSideQuery: 1
>>>>Recursive: Deep: 4, DownSideQuery: 1
>>>>>Recursive: Deep: 5, DownSideQuery: 1
>>>>>>Recursive: Deep: 6, DownSideQuery: 1
>>>>>>>Recursive: Deep: 7, DownSideQuery: 1
>>>>>>>>Recursive: Deep: 8, DownSideQuery: 1
>>>>>>>>>Recursive: Deep: 9, DownSideQuery: 1
>>>>>>>>>>Recursive: Deep: 10, DownSideQuery: 1
Limit occured (10). Turning back...
>>>>>>>>>>Recursive: Deep: 10, UpSideQuery: 1
>>>>>>>>>Recursive: Deep: 9, UpSideQuery: 1
>>>>>>>>Recursive: Deep: 8, UpSideQuery: 1
>>>>>>>Recursive: Deep: 7, UpSideQuery: 1
>>>>>>Recursive: Deep: 6, UpSideQuery: 1
>>>>>Recursive: Deep: 5, UpSideQuery: 1
>>>>Recursive: Deep: 4, UpSideQuery: 1
>>>Recursive: Deep: 3, UpSideQuery: 1
>>Recursive: Deep: 2, UpSideQuery: 1
>Recursive: Deep: 1, UpSideQuery: 1
------------------------------------------------------------------------
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