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Request #19974 force close persistent SQL connections
Submitted: 2002-10-18 07:13 UTC Modified: 2011-01-07 16:13 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:1 (100.0%)
From: artem at osp dot ru Assigned: mysql (profile)
Status: Wont fix Package: MySQL related
PHP Version: 4.2.3 OS: Linux
Private report: No CVE-ID: None
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From: artem at osp dot ru
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 [2002-10-18 07:13 UTC] artem at osp dot ru 
From time to time I need close my SQL connections becose using Lock, temporary tables, etc. But such code executed rare. 
Can you add new function?
like:
bool mysql_pclose ([bool on_script_exit_or_now=FALSE,[resource link_identifier]])

This function will allow easy using locks and temporary tables and do not loose efficiency.

using this function can be such:
------
mysql_pconnent(...);
...
if(rare_case) {
 mysql_pclose(TRUE); # close connect at exit
 mysql_query("create temporary table ....");
 ...
}
-----
or such:
------
mysql_pconnent(...);
...
if(rare_case) {
 mysql_query("create temporary table ....");
 ...
 mysql_pclose(); # close connect now
}
-----

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 [2002-10-18 08:46 UTC] georg@php.net 
When you have a pclose, there is no need for pconnect, you 
can also use mysql_connect.

Currently the problem is, that persistent connections in 
MySQL have some disadvantages/bugs/problems:

- no unset for user variables
- session variables are not restored to global variables
- no unlock for tables
- unselect previous selected database
- temporary tables are not deleted
- ROLLBACK of not commited transactions
- SQL_FOUND_ROWS returns a valid result

currently MySQL AB works on a new api-function 
mysql_reset_connection to fix all these things, so we have 
to wait. Currently there is not enough functionality to 
fix/handle this inside the mysql extension.
 [2002-10-21 02:53 UTC] artem at osp dot ru 
You can call it function
'mysql_reset_connection' or 'mysql_pclose', as you like.
Of course, the target of this function is close those disadvantages, which you list.
 [2011-01-01 01:08 UTC] jani@php.net
-Package: Feature/Change Request +Package: MySQL related
 [2011-01-06 17:20 UTC] uw@php.net
-Assigned To: +Assigned To: mysql
 [2011-01-06 17:20 UTC] uw@php.net 
... don't think we should do anything on it. That magic new function is mysql_change_user, its called by default with mysqli to clean up connection, its exported in the mysqli API. People should just move forward to mysqli.
 [2011-01-07 15:36 UTC] andrey@php.net
-Status: Assigned +Status: Wont fix
 [2011-01-07 15:36 UTC] andrey@php.net 
Please use mysql_change_user() to reset the connection
 [2011-01-07 16:13 UTC] uw@php.net 
ext/mysql does not export mysql_change_user(). It cannot be called from PHP. However, I agree with Won't fix.
 
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