Re: [PHP-DB] Transaction over persistent connection problem
Hello, on 04/27/2005 08:13 PM Jochem Maas said the following: Ok. So the idea of splitting one transaction into two steps of a script is wrong? Yes, it is not possible to achive that. What happens is that first access to script is handled by one Web server process or thread and you cannot assure that the second access will be handled by the same Web process or server to finish the same transaction that was started. some thoughts: if he ran the the page/script on a seperate webserver (configured to run one process), especially for this one task - to which only one person [c|w]ould connect - then it would be technically doable no? It would be the same problem because the other separate Web server script would start the transaction and then it would end. The problem is not running many processes per script but rather that PHP scripts exit after they serve their response. Furthermore, if the main Web server could run many scripts in parallel that would ask the separate server to start a transaction. Even if it was feasable to end the transaction in a second request, how would the separate know which transaction was started by which client? The problem all boils down to the fact that HTTP is stateless. Even if starting and ending transactions on different request was feasible, transactions should be managed by a different type of server, not really by common HTTP servers. Furthermore, you should never leave a transaction open that you cannot guarantee that it will finished in a very short notice, otherwise it may say database server is in the US, and connecting server (that makes use of transactions) is in Europe... how are you going to guarantee that the connecting server will never suffer network or power loss midway thru a transaction? (I'd put money on the fact that the same thing has crossed the minds of more than one database engine developer.) Disconnected or timed-out transactions should be aborted and implicit rollback happens. However that happens in an abnormal situations. Timeout and rollback only happens to assure that there are no outstanding transactions living for more than a short period (were talking about seconds here). If you need to start a more complex operation that needs to wait for user response during an unknown period, you need to use other kind of non-blocking locking methods. block the access to the whole database forever. thats a broad statement. a transaction doesn't have to block access per definition, It must be atomic, therefore no more than once concurrent access can change the same data. and its not unfeasable to suggest that some database engines may account for the possibility for 'hung' transaction in some kind of garbage collection routine...? It is not really a garbage collection but rather aborting transactions (rollback) after a timeout or disconnection. -- Regards, Manuel Lemos PHP Classes - Free ready to use OOP components written in PHP http://www.phpclasses.org/ PHP Reviews - Reviews of PHP books and other products http://www.phpclasses.org/reviews/ Metastorage - Data object relational mapping layer generator http://www.meta-language.net/metastorage.html -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Transaction over persistent connection problem
Manuel Lemos wrote: Hello, on 04/27/2005 11:49 AM Oskar said the following: Ok. So the idea of splitting one transaction into two steps of a script is wrong? Yes, it is not possible to achive that. What happens is that first access to script is handled by one Web server process or thread and you cannot assure that the second access will be handled by the same Web process or server to finish the same transaction that was started. some thoughts: if he ran the the page/script on a seperate webserver (configured to run one process), especially for this one task - to which only one person [c|w]ould connect - then it would be technically doable no? Furthermore, you should never leave a transaction open that you cannot guarantee that it will finished in a very short notice, otherwise it may say database server is in the US, and connecting server (that makes use of transactions) is in Europe... how are you going to guarantee that the connecting server will never suffer network or power loss midway thru a transaction? (I'd put money on the fact that the same thing has crossed the minds of more than one database engine developer.) block the access to the whole database forever. thats a broad statement. a transaction doesn't have to block access per definition, and its not unfeasable to suggest that some database engines may account for the possibility for 'hung' transaction in some kind of garbage collection routine...? -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] Transaction over persistent connection problem
Thanks for your help, Manuel. Your advice saved me hours of searching the web. Regards, OKi98 > -Original Message- > From: Manuel Lemos [mailto:[EMAIL PROTECTED] > Sent: Wednesday, April 27, 2005 7:20 PM > To: php-db@lists.php.net > Subject: Re: [PHP-DB] Transaction over persistent connection problem > > > Yes, it is not possible to achive that. What happens is that first > access to script is handled by one Web server process or thread and you > cannot assure that the second access will be handled by the same Web > process or server to finish the same transaction that was started. > > Furthermore, you should never leave a transaction open that you cannot > guarantee that it will finished in a very short notice, otherwise it may > block the access to the whole database forever. > > > -- > > Regards, > Manuel Lemos > > PHP Classes - Free ready to use OOP components written in PHP > http://www.phpclasses.org/ > > PHP Reviews - Reviews of PHP books and other products > http://www.phpclasses.org/reviews/ > > Metastorage - Data object relational mapping layer generator > http://www.meta-language.net/metastorage.html > > -- > PHP Database Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > > -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] php4 can't find tnsnames.ora oracle9 but can connectif description
Without real information I can only wonder and guess.
Is TNS_ADMIN set to a directory or a file? It should be a directory.
Try renaming sqlnet.ora temporarily or set the alias in tnsnames.ora
to something like "testdb.boo.com = (DESCRIPTION = ..."
Chris
neil smith wrote:
Hello chris,
I've modified the variables in the apache user environment (in my case
root at the moment) but that didn't amke any difference to php not being
able to find tnsnames.ora. So the work around I've used is to use
ORACLE_SID="desciption(...etc. SID = )))"; ie the full description
of the database alias within tnsnames.ora
However this is not good, so if you have any other idea please let me
know. I'm flumuxed.
thanks,
neil
>From: Christopher Jones <[EMAIL PROTECTED]>
>To: neil smith <[EMAIL PROTECTED]>
>CC: php-db@lists.php.net, [EMAIL PROTECTED]
>Subject: Re: [PHP-DB] php4 can't find tnsnames.ora oracle9 but can
connectif description hardcoded
>Date: Wed, 20 Apr 2005 09:25:12 +1000
>
>Make sure the environment variables are set in the shell that starts
>Apache. See
>http://www.oracle.com/technology/tech/opensource/php/php_troubleshooting_faq.html#envvars
>
>Try changing your OCILogon command to
>
> $odbc =
OCILogon("yourusername","yourpassword",$db);
>
>i.e. remove "/test" from the username parameter.
>
>Chris
>
>neil smith wrote:
>>Hello,
>>
>>I have test script that can connect to the oracle database. It
>>doesn't
>>require tnsnames.ora because I define the database alias in the
>>script
>>itself. It looks like this:
>>
>>
>>
>>echo
"TWO_TASK=".getenv("TWO_TASK")."
";
>>echo
"LD_LIBRARY_PATH=".getenv("LD_LIBRARY_PATH")."
";
>>echo
"ORACLE_BASE=".getenv("ORACLE_BASE")."
";
>>echo
"ORACLE_HOME=".getenv("ORACLE_HOME")."
";
>>echo
"TNS_ADMIN=".getenv("TNS_ADMIN")."
";
>>echo
"NLS_LANG=".getenv("NLS_LANG").".
";
>>
>># this allows a successful connection
>>
>>$db = " (DESCRIPTION =
>> (ADDRESS = (PROTOCOL = TCP) (HOST =testdb.boo.com)(PORT = 1521))
>> (CONNECT_DATA= (SID = testdb))
>> )";
>>
>>// these don't work.. php can't seem to find tnsnames.ora
>># $db = "testdb.boo.com";
>>//$db = "testdb.boo.com";
>># $db = "testdb";
>>//echo $testdb;
>>
>>
>>$odbc = OCILogon("test/test","test",$db);
>>
>>if ($odbc == false){
>> $msg = OCIError($odbc)."
";
>>} else {
>>echo "success!!!
";
>>}
>>
>>
>>
>>My problem is is that when I try to use the database alias in
>>tnsnames.ora I
>>get an ora-12154 error. I get this despite the facts that
>>oracle_home,
>>tns_admin and everything else is defined in the script and the
>>tnsnames.ora
>>contains exactly the same alias as I use in the hardcoded version
>>(see the
>>uncommented $db above).
>>sqlnet.ora contains a value name_domain that apparently is appended
>>to the
>>alias in tnsnames.ora but accounting for this still doesn't let me
>>connect
>>to oracle . It's as if tnsnames.ora cannot be found. I've changed
>>the
>>permissions to 777 for the whole directory structure and I can
>>successfully
>>use tnsnames.ora with sqlplus or tnsping.
>>
>>Does anybody have any ideas what is going wrong? Is this a bug?
>>
>>thanks,
>>
>>neil
>>
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Re: [PHP-DB] Transaction over persistent connection problem
Hello, on 04/27/2005 11:49 AM Oskar said the following: Ok. So the idea of splitting one transaction into two steps of a script is wrong? Yes, it is not possible to achive that. What happens is that first access to script is handled by one Web server process or thread and you cannot assure that the second access will be handled by the same Web process or server to finish the same transaction that was started. Furthermore, you should never leave a transaction open that you cannot guarantee that it will finished in a very short notice, otherwise it may block the access to the whole database forever. -- Regards, Manuel Lemos PHP Classes - Free ready to use OOP components written in PHP http://www.phpclasses.org/ PHP Reviews - Reviews of PHP books and other products http://www.phpclasses.org/reviews/ Metastorage - Data object relational mapping layer generator http://www.meta-language.net/metastorage.html -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: FW: [PHP-DB] mime-type related to extension?. .
* Martin Norland <[EMAIL PROTECTED]>: > meal list_php wrote: > > Hi I sent this on 21st of april and got no answer... > > there is no way to check the "real" mime type of a file? > > even a file without extension? > > thanks, > > You can call out to an external program called "file" (which is pretty > much guaranteed to be there, on a Linux system) which uses some magic to > determine the file type. It should be able to tell you if the file is > jpeg regardless, without any messy work from you. It will return a > string like so: > $ file false.doc > false.doc: JPEG image data, JFIF standard 1.02 > I'd run a few tests with some images from different sources, but it > should be returning a very standard string - "JPEG image data" should at > least be common. IIRC Sony also has a 'motion jpeg' which might cause > you problems, depending on what you're doing - if you can get a hold of > one of those to test (if it's a concern) you might want to. An additional tool that may be used when simply checking for image types is to use getimagesize() -- though you should be using php >= 4.3.11 to do this safely (see http://security.gentoo.org/glsa/glsa-200504-15.xml for more information). One element returned by getimagesize() is the image MIME type. -- Matthew Weier O'Phinney | WEBSITES: Webmaster and IT Specialist | http://www.garden.org National Gardening Association| http://www.kidsgardening.com 802-863-5251 x156 | http://nationalgardenmonth.org mailto:[EMAIL PROTECTED] | http://vermontbotanical.org -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] Transaction over persistent connection problem
Ok. So the idea of splitting one transaction into two steps of a script is
wrong?
I wanted to use it in a script that is importing big amount of datas (about
200k rows).
First step:
mysql_pconnect()
start transaction
insert rows and test errors
no errors => commit, mysql_close()
some errors => echo("Some errors occured. Do you want to keep
non-error
entries in database? Yes/No");
Second step:
mysql_pconnect()
Yes => commit
No => rollback
mysql_close()
> -Original Message-
> From: Manuel Lemos [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, April 27, 2005 4:21 PM
> To: php-db@lists.php.net
> Subject: Re: [PHP-DB] Transaction over persistent connection problem
>
>
> The solution of Metabase (portable database abstraction package) is to
> implicitly register a shutdown function that clean any pending
> transactions:
>
> http://www.phpclasses.org/metabase
>
>
> --
>
> Regards,
> Manuel Lemos
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
> PHP Reviews - Reviews of PHP books and other products
> http://www.phpclasses.org/reviews/
>
> Metastorage - Data object relational mapping layer generator
> http://www.meta-language.net/metastorage.html
>
> --
> PHP Database Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>
>
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Re: [PHP-DB] Transaction over persistent connection problem
Hello, on 04/27/2005 09:58 AM Oskar said the following: You see - tables are locked and the only way to fix it is restarting MySQL. Could you tell me what am I doing wrong, please? I suspect that your scripts may be exiting once in a while with unfinished transactions due to bugs or errors that make it end prematurely. With persistent connections you need to rollback unfinished transations by the end of the script. The solution of Metabase (portable database abstraction package) is to implicitly register a shutdown function that clean any pending transactions: http://www.phpclasses.org/metabase -- Regards, Manuel Lemos PHP Classes - Free ready to use OOP components written in PHP http://www.phpclasses.org/ PHP Reviews - Reviews of PHP books and other products http://www.phpclasses.org/reviews/ Metastorage - Data object relational mapping layer generator http://www.meta-language.net/metastorage.html -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Memory. .
[FOTOList.com] Suporte wrote: Hi, When I get something from database, using this function: pg_query (postgresql) or mysql_query and after put this result in somes variables, Am I using double memory to same data or this new variable point to variable with db result? The postgresql or mysql process is storing the resultset in memory, php is passed the address of the resultset. When you actually pull the individual rows out of the resultset into PHP and assign them a variable, you are storing a second copy of that. If you pull out all the rows and store them in an array in PHP, you then have two copies of your entire data. If you need to pull your whole set of results out into an array, you can immediately use pg_free_result() or mysql_free_result() afterwards to free up the copy using memory in the database. cheers, -- - Martin Norland, Sys Admin / Database / Web Developer, International Outreach x3257 The opinion(s) contained within this email do not necessarily represent those of St. Jude Children's Research Hospital. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] Using Memory
Hi, When I get something from database, using this function: pg_query (postgresql) or mysql_query and after put this result in somes variables, Am I using double memory to same data or this new variable point to variable with db result? Gustavo Paixão -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] Memory
Hi, When I get something from database, using this function: pg_query (postgresql) or mysql_query and after put this result in somes variables, Am I using double memory to same data or this new variable point to variable with db result? Gustavo Paixão -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: FW: [PHP-DB] mime-type related to extension?. .
meal list_php wrote: Hi I sent this on 21st of april and got no answer... there is no way to check the "real" mime type of a file? even a file without extension? thanks, You can call out to an external program called "file" (which is pretty much guaranteed to be there, on a Linux system) which uses some magic to determine the file type. It should be able to tell you if the file is jpeg regardless, without any messy work from you. It will return a string like so: $ file false.doc false.doc: JPEG image data, JFIF standard 1.02 I'd run a few tests with some images from different sources, but it should be returning a very standard string - "JPEG image data" should at least be common. IIRC Sony also has a 'motion jpeg' which might cause you problems, depending on what you're doing - if you can get a hold of one of those to test (if it's a concern) you might want to. cheers, -- - Martin Norland, Sys Admin / Database / Web Developer, International Outreach x3257 The opinion(s) contained within this email do not necessarily represent those of St. Jude Children's Research Hospital. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] Transaction over persistent connection problem
Hello, I would like to create transaction that is commited/rolled back in the next step of the script. Example: Apply changes? Yes No I don't know why but sometimes the script works sometimes not and then MySQL processlist is: TRANSACTIONS Trx id counter 0 1647875 Purge done for trx's n:o < 0 1647364 undo n:o < 0 0 History list length 5 Total number of lock structs in row lock hash table 1 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 0 0, not started, OS thread id 620 MySQL thread id 6, query id 23 localhost 127.0.0.1 root SHOW INNODB STATUS ---TRANSACTION 0 1647874, not started, OS thread id 2852 MySQL thread id 5, query id 12 localhost 127.0.0.1 ODBC ---TRANSACTION 0 1647873, not started, OS thread id 1152 MySQL thread id 3, query id 8 localhost 127.0.0.1 ODBC ---TRANSACTION 0 1647872, ACTIVE 926 sec, OS thread id 440 2 lock struct(s), heap size 320, undo log entries 1 MySQL thread id 1, query id 3 localhost 127.0.0.1 ODBC You see - tables are locked and the only way to fix it is restarting MySQL. Could you tell me what am I doing wrong, please? OKi98 -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] mime-type related to extension?
The beginning of the jpeg file in hex looks like this:
FF D8 FF
perhaps you could test for that occurrence. Be aware that the occurrence of
FF D8 FF must be in each jpg file -- it does not mean that the occurrence of
FF D8 FF is found only in a jpg file.
http://filext.com/detaillist.php?extdetail=JPG
you could also try http://www.jpeg.org/index.html
Mark Cain
- Original Message -
From: "mel list_php" <[EMAIL PROTECTED]>
To:
Sent: Wednesday, April 27, 2005 4:03 AM
Subject: FW: [PHP-DB] mime-type related to extension?
> Hi I sent this on 21st of april and got no answer...
> there is no way to check the "real" mime type of a file?
> even a file without extension?
> thanks,
> melanie
>
>
> >From: "mel list_php" <[EMAIL PROTECTED]>
> >To: php-db@lists.php.net
> >Subject: [PHP-DB] mime-type related to extension?
> >Date: Thu, 21 Apr 2005 13:45:45 +
> >
> >Hi guys!
> >
> >I have a basic form to upload files, my problem is about the mime type.
> >I use $type= $_FILES[$file_uploaded]['type']; to check the mime-type of
the
> >fila as I want to allow only .jpeg.
> >I have then a test like:
> >if ($type=="image/pjpeg" || $type=="image/jpeg")
> >{
> >...
> >}
> >
> >Upload working fine if I send "red.jpg".
> >However if I rename the file in "red", php recognizes it as
> >application/octet-stream and not jpeg.
> >I'm working under linux and for me the extension is not required for a
> >file, I thought the mime-type was encoded in the file itself and was
> >independent of the extension.
> >Any clue on that?
> >Any other php function I should look at?
> >The cookbook and pear both use $_FILES[ ] ['type'] so I have no idea
here.
> >
> >Thanks,
> >Melanie
> >
> >_
> >It's fast, it's easy and it's free. Get MSN Messenger today!
> >http://www.msn.co.uk/messenger
> >
> >--
> >PHP Database Mailing List (http://www.php.net/)
> >To unsubscribe, visit: http://www.php.net/unsub.php
> >
>
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>
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FW: [PHP-DB] mime-type related to extension?
Hi I sent this on 21st of april and got no answer...
there is no way to check the "real" mime type of a file?
even a file without extension?
thanks,
melanie
From: "mel list_php" <[EMAIL PROTECTED]>
To: php-db@lists.php.net
Subject: [PHP-DB] mime-type related to extension?
Date: Thu, 21 Apr 2005 13:45:45 +
Hi guys!
I have a basic form to upload files, my problem is about the mime type.
I use $type= $_FILES[$file_uploaded]['type']; to check the mime-type of the
fila as I want to allow only .jpeg.
I have then a test like:
if ($type=="image/pjpeg" || $type=="image/jpeg")
{
...
}
Upload working fine if I send "red.jpg".
However if I rename the file in "red", php recognizes it as
application/octet-stream and not jpeg.
I'm working under linux and for me the extension is not required for a
file, I thought the mime-type was encoded in the file itself and was
independent of the extension.
Any clue on that?
Any other php function I should look at?
The cookbook and pear both use $_FILES[ ] ['type'] so I have no idea here.
Thanks,
Melanie
_
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http://www.msn.co.uk/messenger
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