ID: 19529
Updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
-Status: Analyzed
+Status: Feedback
Bug Type: MySQL related
Operating System: Linux 2.4.18
PHP Version: 4.2.3
Assigned To: georg
New Comment:
A possible fix (based on discussions between Rasmus and the MySQL team)
has just been committed to CVS. If the fix works praise Rasmus, if it
fails, blame me! :)
Please try the latest CVS version and see if the bug can be
reproduced.
Also, regarding the connect_timeout tests. If connect_timeout is set to
-1, then we want to rely on the MySQL settings for this option, rather
than attempting to override the option with a value set in PHP.
Previous Comments:
------------------------------------------------------------------------
[2002-10-09 02:56:39] [EMAIL PROTECTED]
I think the real problem here is the order things happen in. A
ROLLBACK or an AUTOCOMMIT query do not return a result set and thus do
not need to be dealt with as you describe here. It is more likely that
there is an existing result set that has not be explicitly freed in the
PHP script and the PHP destructor for that result set is being called
after the call to restore_connection_default. That's when you would
get an out-of-sync error because the ROLLBACK is called with an
outstanding result set.
So, for those of you experiencing this problem, try explicitly calling
mysql_free_result() on your result sets.
------------------------------------------------------------------------
[2002-10-08 21:10:15] [EMAIL PROTECTED]
MySQL is complaining about things not being cleaned up. This is because
any query that returns results (which one's don't -- any?) must get
them.
In case of an unbuffered query, we need to eat the rest of the rows
before exiting (like we do when a new query is run when an old
unbuffered query was not finished). I removed the warning in this case,
but you all can change it as you please.
The case that is hitting me (and EVERYONE out there using persistent
connections with current revs) is that there is a rollback. But there
is nothing to get the results of the rollback. This means, that the
next script to use this persistent connection will generally fail on
the first query, but might do alright on the others. For this reason, I
recommend anyone use PHP 4.2.3 (maybe earlier versions as well) to turn
off persistent connections for now.
Also, in CVS there is something to reset AUTOCOMMIT. It also did not
clean up and that causes additional issues. I removed it rather than
fixed it. Who says AUTOCOMMIT=1 should be the default for a certain
server? That is user configurable on the server side. Personally, I
like the idea of resetting all the variables that might have been
changed (including that one). There are a lot. No good way to do it
right now.
Oh, what else? Ah.. the code in CVS for mysql.connection.timeout. That
rocks! However, it sets the default to zero and then checks for -1 as a
sign not to include the option. Oops. So the default timeout value is
set to nothing when the user doesn't do anything. That is a
unpredictable change in behavior.
I have some changes below. My first time even looking at this code, so
look for any mistakes.
static int _restore_connection_defaults(zend_rsrc_list_entry *rsrc
TSRMLS_DC)
{
php_mysql_conn *link;
char query[128];
char user[128];
char passwd[128];
/* check if its a persistent link */
if (Z_TYPE_P(rsrc) != le_plink)
return 0;
link = (php_mysql_conn *) rsrc->ptr;
if (link->active_result_id) do {
int type;
MYSQL_RES *mysql_result;
mysql_result = (MYSQL_RES *)
zend_list_find(link->active_result_id, &type);
if (mysql_result && type==le_result) {
if (!mysql_eof(mysql_result)) {
while (mysql_fetch_row(mysql_result));
}
zend_list_delete(link->active_result_id);
link->active_result_id = 0;
}
} while(0);
/* rollback possible transactions */
strcpy (query, "ROLLBACK");
if (mysql_real_query(&link->conn, query, strlen(query)) !=0 ) {
MYSQL_RES *mysql_result=mysql_store_result(&link->conn);
mysql_free_result(mysql_result);
}
/* unset the current selected db */
#if MYSQL_VERSION_ID > 32329
strcpy (user, (char *)(&link->conn)->user);
strcpy (passwd, (char *)(&link->conn)->passwd);
mysql_change_user(&link->conn, user, passwd, "");
#endif
return 0;
}
And change the two copies of this:
if (connect_timeout != -1)
to
if (connect_timeout <= 0)
My 2 cents for the day.
------------------------------------------------------------------------
[2002-10-07 07:02:42] [EMAIL PROTECTED]
Removing the ROLLBACK seems to have fixed the problem for me too.
Reading the MySQL docs on the error message in question, it would seem
that just adding a mysql_free_result call before executing the ROLLBACK
query might fix things. I noticed that the PgSQL extension does
something similar when rolling back transactions at shutdown.
------------------------------------------------------------------------
[2002-10-06 14:51:51] [EMAIL PROTECTED]
Currently, neither mysql 4.x or 3.x supports enough functionality for
handling some problems when using persistent connections, e.g.
restoring session variables to global variables,
restoring auto_commit, unsetting user variables etc.
The probably error is not MySQL-version dependend. The 4.x clientlib is
100% backwards compatible to MySQL 3.x (> .23).
For some more information, it would be useful, if you could send me
some sources...
assigned to myself.
Georg
------------------------------------------------------------------------
[2002-10-06 12:23:42] [EMAIL PROTECTED]
The problem seems to have disappeared when the ROLLBACK was removed.
------------------------------------------------------------------------
The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/19529
--
Edit this bug report at http://bugs.php.net/?id=19529&edit=1
