[PHP] Facebook PHP compiler
Hello, Have you guys checked this PHP to C++ converter from the Facebook People? http://developers.facebook.com/news.php?blog=1story=358 Regards, -- Cesar D. Rodas cro...@php.net http://crodas.org/ -- http://cesar.la/ Phone: +595-961-974165 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Facebook PHP compiler
Cesar D. Rodas wrote: Hello, Have you guys checked this PHP to C++ converter from the Facebook People? http://developers.facebook.com/news.php?blog=1story=358 Very interesting... I heard about this a few days ago on Slashdot. Most people figured it would be a compiler of some sort, though it's interesting they chose C++ instead of C as Roadsend has done. I also wonder why they didn't just jump on board with Roadsend, but perhaps they wanted full control (which makes sense from the perspective of their needs). Either way, it's another tool that can only be good for PHP. Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] DOM TextArea (and dom chart please)
Hey!
i'm just starting with PHP's DOM-XML and need a little help please.
Basically, first i am trying to see if a input like a textbox has a 'VALUE='
associated with it, if yes, i leave it be, if no, i add a default value.
This *is working* as can be seen by the attached code below.
But a bit confused as to how to do the same for a textarea as textarea's do not
have a 'VALUE=' attribute.
Heres my code:
$website_data = file_get_contents('dom_test.html');//load the website data,
$dom = new DomDocument; //make a new DOM container in PHP
$dom-loadHTML($website_data); //load all the fetched data into the DOM
container
$inputs = $dom-getElementsByTagName('input'); // Find Sections
foreach ($inputs as $input) { //*** this block has the guts of the
functionality ***
if(!$input-getAttribute(value) || $input-getAttribute(value)==)
{
$input-setAttribute(value, RRR);
}
}
// * now we come to the textarea bit that is not working *
$inputs2 = $dom-getElementsByTagName('textarea'); // Find textareas
foreach ($inputs2 as $input2) {
if(!$input2-firstChild.nodeValue==) {
$input2-firstChild.nodeValue==it works!;
}
}
echo $dom-saveHTML();
?
+++
// I have even tried this instead of the above:
foreach ($inputs2 as $input2) {
if(!$input2-getAttribute(defaultValue)==) {
$input2-setAttribute(defaultValue,it works!);
}
}
but no joy.
I'm betting its pretty simple but i dont have a DOM chart for php, the only
ones i have been able to find via google are for javascript like this one:
http://www.hscripts.com/tutorials/javascript/dom/textarea-events.php
and that chart does not help much. Does anyone have a PHP DOM chart or a
resource that i can use to get started using this?
Thanks in advance!
Ryan
--
- The faulty interface lies between the chair and the keyboard.
- Creativity is great, but plagiarism is faster!
- Smile, everyone loves a moron. :-)
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Re: [PHP] DOM TextArea (and dom chart please)
On Tue, 2010-02-02 at 11:29 -0800, Ryan S wrote:
Hey!
i'm just starting with PHP's DOM-XML and need a little help please.
Basically, first i am trying to see if a input like a textbox has a 'VALUE='
associated with it, if yes, i leave it be, if no, i add a default value.
This *is working* as can be seen by the attached code below.
But a bit confused as to how to do the same for a textarea as textarea's do
not have a 'VALUE=' attribute.
Heres my code:
$website_data = file_get_contents('dom_test.html');//load the website data,
$dom = new DomDocument; //make a new DOM container in PHP
$dom-loadHTML($website_data); //load all the fetched data into the DOM
container
$inputs = $dom-getElementsByTagName('input'); // Find Sections
foreach ($inputs as $input) { //*** this block has the guts of the
functionality ***
if(!$input-getAttribute(value) ||
$input-getAttribute(value)==) {
$input-setAttribute(value, RRR);
}
}
// * now we come to the textarea bit that is not working *
$inputs2 = $dom-getElementsByTagName('textarea'); // Find textareas
foreach ($inputs2 as $input2) {
if(!$input2-firstChild.nodeValue==) {
$input2-firstChild.nodeValue==it works!;
}
}
echo $dom-saveHTML();
?
+++
// I have even tried this instead of the above:
foreach ($inputs2 as $input2) {
if(!$input2-getAttribute(defaultValue)==) {
$input2-setAttribute(defaultValue,it works!);
}
}
but no joy.
I'm betting its pretty simple but i dont have a DOM chart for php, the only
ones i have been able to find via google are for javascript like this one:
http://www.hscripts.com/tutorials/javascript/dom/textarea-events.php
and that chart does not help much. Does anyone have a PHP DOM chart or a
resource that i can use to get started using this?
Thanks in advance!
Ryan
--
- The faulty interface lies between the chair and the keyboard.
- Creativity is great, but plagiarism is faster!
- Smile, everyone loves a moron. :-)
When I get stuck on things like this, I find print_r() invaluable as it
can basically dump out the objects entire contents, so I can see what
values it has set.
Thanks,
Ash
http://www.ashleysheridan.co.uk
Re: [PHP] DOM TextArea (and dom chart please)
// I have even tried this instead of the above:
foreach ($inputs2 as $input2) {
if(!$input2-getAttribute(defaultValue)==) {
$input2-setAttribute(defaultValue,it works!);
}
}
but no joy.
I'm betting its pretty simple but i dont have a DOM chart for php, the only
ones i have been able to find via google are for javascript like this one:
http://www.hscripts.com/tutorials/javascript/dom/textarea-events.php
and that chart does not help much. Does anyone have a PHP DOM chart or a
resource that i can use to get started using this?
When I get stuck on things like this, I find print_r() invaluable as it can
basically dump out the objects entire contents, so I can see what values it has
set.
Hey Ash,
Thanks for replyng.
Where exactly do i use the print_r? and on which variable?
Because i have tried it in different places but still no luck..
Re: [PHP] DOM TextArea (and dom chart please)
Ryan S wrote:
$website_data = file_get_contents('dom_test.html');//load the website data,
$dom = new DomDocument; //make a new DOM container in PHP
$dom-loadHTML($website_data); //load all the fetched data into the DOM
container
I'm not sure what the answer to your issue is, but mind if I make a
couple off topic recommondations?
1) Use loadXML() instead of loadHTML()
The reason is that loadHTML() will mutilate multibyte utf8 characters,
replacing them with entities.
You can still use $dom-saveHTML() to present the data if html is your
target output.
2) loadXML() is less forgiving of malformed content, but you can fix
that by using tidy to import your data
$website_data = new tidy('dom_test.html',$tidy_config);
$website_data-cleanRepair();
$dom-loadXML($website_data);
where
$tidy_config is the tidy configuration array.
Make sure you set
$tidy_config['output-xhtml'] = true;
so that the output of tidy is clean X(ht)ML for loadXML().
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[PHP] database abstraction layer
Hi List I am trying to make a Database Abstraction Layer so I can which the DB of my application between MySQL and Postgresql. I have been looking at the way phpBB does it, and it seems that it is only then php-functions which are different. The SQL seems to be the same. Is it save to assume that I can use the same SQL, or should i make some exceptions? Regards Lars Nielsen -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
Lars Nielsen wrote: Is it save to assume that I can use the same SQL, or should i make some exceptions? Standard SQL should work across all SQL servers with only a few exceptions (for example, MySQL doesn't support full outer joins.) Anything that has to do with server administration, however, such as dealing with users and permissions, will be unique to the db engine. James -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
Lars Nielsen wrote: Hi List I am trying to make a Database Abstraction Layer so I can which the DB of my application between MySQL and Postgresql. I have been looking at the way phpBB does it, and it seems that it is only then php-functions which are different. The SQL seems to be the same. Is it save to assume that I can use the same SQL, or should i make some exceptions? Is there a reason why you want to write your own instead of using something like Pear MDB2? With Pear MDB2 - if your SQL syntax is database specific it will work in the specific database but MDB2 will not try to port a specialized SQL string to another database. It will port some features to some databases, IE if you use the MDB2 facilities for prepared statements (highly recommended) and the target database does not support prepared statements, it will emulate them (I think, haven't tried, that's what I recall reading anyway) but for your actual SQL syntax it is best to stick to standard SQL. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
Lars Nielsen wrote: Hi List I am trying to make a Database Abstraction Layer so I can which the DB of my application between MySQL and Postgresql. I have been looking at the way phpBB does it, and it seems that it is only then php-functions which are different. The SQL seems to be the same. Is it save to assume that I can use the same SQL, or should i make some exceptions? Simple SQL is almost identical. But there are many of the more advanced functions that have major differences. Check out ADOdb for an existing abstraction layer that handles a lot of them. http://adodb.sourceforge.net/ -- Lester Caine - G8HFL - Contact - http://lsces.co.uk/wiki/?page=contact L.S.Caine Electronic Services - http://lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk// Firebird - http://www.firebirdsql.org/index.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
i'm a fan of adodb.sf.net, which i've used with both postgresql and mysql. On Tue, Feb 2, 2010 at 9:23 PM, Lars Nielsen l...@mit-web.dk wrote: Hi List I am trying to make a Database Abstraction Layer so I can which the DB of my application between MySQL and Postgresql. I have been looking at the way phpBB does it, and it seems that it is only then php-functions which are different. The SQL seems to be the same. Is it save to assume that I can use the same SQL, or should i make some exceptions? Regards Lars Nielsen -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
On Tue, Feb 02, 2010 at 09:23:47PM +0100, Lars Nielsen wrote: Hi List I am trying to make a Database Abstraction Layer so I can which the DB of my application between MySQL and Postgresql. I have been looking at the way phpBB does it, and it seems that it is only then php-functions which are different. The SQL seems to be the same. Is it save to assume that I can use the same SQL, or should i make some exceptions? Regards Lars Nielsen Quote of values is different between PostgreSQL and MySQL. I would suggest you do a wrapper class around the PDO classes, which will take care of quoting, etc. Paul -- Paul M. Foster -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Facebook PHP compiler
Looks very promising !!! On Tue, Feb 2, 2010 at 1:12 PM, Robert Cummings rob...@interjinn.comwrote: Cesar D. Rodas wrote: Hello, Have you guys checked this PHP to C++ converter from the Facebook People? http://developers.facebook.com/news.php?blog=1story=358 Very interesting... I heard about this a few days ago on Slashdot. Most people figured it would be a compiler of some sort, though it's interesting they chose C++ instead of C as Roadsend has done. I also wonder why they didn't just jump on board with Roadsend, but perhaps they wanted full control (which makes sense from the perspective of their needs). Either way, it's another tool that can only be good for PHP. Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- Nephtali: PHP web framework that functions beautifully http://nephtaliproject.com
RE: [PHP] database abstraction layer
-Original Message-
From: Lars Nielsen [mailto:l...@mit-web.dk]
Sent: Tuesday, February 02, 2010 12:24 PM
To: php-general@lists.php.net
Subject: [PHP] database abstraction layer
Hi List
I am trying to make a Database Abstraction Layer so I can which the DB
of my application between MySQL and Postgresql. I have been looking at
the way phpBB does it, and it seems that it is only then php-functions
which are different. The SQL seems to be the same.
Is it save to assume that I can use the same SQL, or should i
make some
exceptions?
Regards
Lars Nielsen
There are differences in the actual schema between mySQL and Postgress.
At least there were a few years back when we looked at converting. In the
end, we decided it was too much hassle to switch all our code and database
tables, so just coughed up the licensing for mysql (we were shipping mysql
on our appliance).
So, before you jump into writing all this code, I would first try to make
your app run in postgress and find out about which mySQL statements are
'extensions' to ANSI standard. Case sensitivity was a huge issue for us, as
in one of those RDBMS was very particular about it. There were some other
issues that I can't remember ATM, but perhaps they've been addressed by
now.
One thing I would maybe suggest is (what I do), write a wrapper around your
wrapper -- AKA Double Bag It. :)
Here at Panasonic Avionics (PAC) we use the PEAR::DB class (the really old
version) since we have to interface with mySQL, SQL Server, Oracle (two
versions). That's where PEAR::DB comes in. However, it's very crude and you
have a lot of redundant code in every page. Like this:
http://pear.php.net/manual/en/package.database.db.intro-fetch.php
You always have to open a connection, test for errors, do the query, test
for errors, fetch the rows, etc..
When I came on board a year ago, I put an end to that micky mouse crap. I
wrote a nice db.inc.php wrapper that handles all that sort of thing, and
then pumps it up like it's on steroids. I added auto-reconnect in case the
connection dropped. I added color-coded SQL output with substitution for
the '?'. I added a last_insert_it() routine which is proprietary to mySQL
BTW (speaking of incompatibilities). I added routines to get an Enum
column, or to get a simple array pairing, etc. It can even force reads from
slave and writes to master! It pretty much kicks ass.
Just simply do this:
$myfoo = sql_query('agis_core', 'SELECT * FROM foo WHERE bar = ?', $bar);
All the minutia is handled for you and $myfoo is now an array of your
results. :)
So, now we code using my wrapper and should we want to switch out the DBAL
later to a more modern one, we just change OUR wrapper calls. There is
minimal overhead, and the pros FAR outweigh any cons.
I've attached it here.
We have another config.inc.php that has the DB settings for each
DEV/TEST/PROD master/slave servers (as they are all different accounts for
security reasons. So just make one with entries like this:
// AGISCore Database DEV Master mySQL:
$global_db_dsn_agis_core_master = array(
'phptype' = 'mysql',
'username' = 'RWMaster',
'password' = 'rwmaster',
'hostspec' = '10.10.10.2:3306',
'database' = 'agis_core',
'persistent' = TRUE
);
// AGISCore Database DEV Slave mySQL:
$global_db_dsn_agis_core_slave = array(
'phptype' = 'mysql',
'username' = 'ROSlave',
'password' = 'roslave',
'hostspec' = '10.10.10.3:3306',
'database' = 'agis_core',
'persistent' = TRUE
);
$GLOBALS['DB_CONNECTIONS'] is a singleton (sans the class overhead) so that
you always get the same handle for each database call and don't spawn new
ones each time. Nice. :)
?php
/**
* All of the database wrapper functions
*
* This is a wrapper around the PEAR::DB class. It provides many enhancements
including
* a singleton for database handle connections, retries for connections,
debugging with ? substitutions,
* handy routines to populate arrays, select boxes, IN() statements, etc. It
can do SQL timing profiling.
* There are routines for INSERT and UPDATE by simply passing in an array of
key/value pairs.
*
* Confidential property of Panasonic Avionics. Do not copy or distribute.
* @copyright 2006-2010 Panasonic Avionics. All rights reserved.
* @categoryCategoryName
* @package PackageName
* @see
* @since DART2
* @author Daevid Vincent daevid.vinc...@panasonic.aero
* @dateCreated: 2009-01-20
* @version CVS: $Id: db.inc.php,v 1.39 2010/01/29 01:35:30 vincentd Exp $
*/
require_once '/usr/share/php/DB.php';
$SQL_OPTION['noHTML']= false;
$SQL_OPTION['fullQuery'] = true;
$SQL_OPTION['useLogger'] = false;
$SQL_OPTION['profile'] = 0;
$SQL_OPTION['debug'] = false;
$SQL_OPTION['outfile'] = false; //set this to a filename, and use $show_sql
in your queries and they'll go to this file.
Re: [PHP] database abstraction layer
On Tue, Feb 02, 2010 at 01:15:22PM -0800, Daevid Vincent wrote:
-Original Message-
From: Lars Nielsen [mailto:l...@mit-web.dk]
Sent: Tuesday, February 02, 2010 12:24 PM
To: php-general@lists.php.net
Subject: [PHP] database abstraction layer
Hi List
I am trying to make a Database Abstraction Layer so I can which the DB
of my application between MySQL and Postgresql. I have been looking at
the way phpBB does it, and it seems that it is only then php-functions
which are different. The SQL seems to be the same.
Is it save to assume that I can use the same SQL, or should i
make some
exceptions?
Regards
Lars Nielsen
There are differences in the actual schema between mySQL and Postgress.
At least there were a few years back when we looked at converting. In the
end, we decided it was too much hassle to switch all our code and database
tables, so just coughed up the licensing for mysql (we were shipping mysql
on our appliance).
So, before you jump into writing all this code, I would first try to make
your app run in postgress and find out about which mySQL statements are
'extensions' to ANSI standard. Case sensitivity was a huge issue for us, as
in one of those RDBMS was very particular about it. There were some other
issues that I can't remember ATM, but perhaps they've been addressed by
now.
One thing I would maybe suggest is (what I do), write a wrapper around your
wrapper -- AKA Double Bag It. :)
Here at Panasonic Avionics (PAC) we use the PEAR::DB class (the really old
version) since we have to interface with mySQL, SQL Server, Oracle (two
versions). That's where PEAR::DB comes in. However, it's very crude and you
have a lot of redundant code in every page. Like this:
http://pear.php.net/manual/en/package.database.db.intro-fetch.php
You always have to open a connection, test for errors, do the query, test
for errors, fetch the rows, etc..
When I came on board a year ago, I put an end to that micky mouse crap. I
wrote a nice db.inc.php wrapper that handles all that sort of thing, and
then pumps it up like it's on steroids. I added auto-reconnect in case the
connection dropped. I added color-coded SQL output with substitution for
the '?'. I added a last_insert_it() routine which is proprietary to mySQL
BTW (speaking of incompatibilities). I added routines to get an Enum
column, or to get a simple array pairing, etc. It can even force reads from
slave and writes to master! It pretty much kicks ass.
Just simply do this:
$myfoo = sql_query('agis_core', 'SELECT * FROM foo WHERE bar = ?', $bar);
All the minutia is handled for you and $myfoo is now an array of your
results. :)
So, now we code using my wrapper and should we want to switch out the DBAL
later to a more modern one, we just change OUR wrapper calls. There is
minimal overhead, and the pros FAR outweigh any cons.
+1
Though I would use PDO instead of Pear::DB. Also
sequential/autoincrement values are differently specified in
MySQL/PostgreSQL. I did something similar to Daevid using PDO, and also
wrote a last_insert_id() function. It requires the database class to
know what flavor of SQL it's using, and implements the proper function
to return the ID based on that (PostgreSQL has its own version). I would
also suggest that failed queries and commands (not just no useful
result) terminate script execution. PDO functions generally return false
when you feed them absolute garbage, and you don't want to try to
continue execution after that.
An awful lot of SQL is the same between engines, but there are a lot of
edge cases. The only other alternative is something like Active Record,
and I personally wouldn't wish that on anyone. My personal opinion is
that a programmer should learn the SQL dialect he's working with and use
it, rather than something like Active Record. Internally we use
PostgreSQL exclusively. The only time I use MySQL is for customer sites
where their hosting companies don't support PostgreSQL. In that case, I
simply write SQL targetted at MySQL's dialect. It all goes through the
same database class to perform error checking and results return.
Paul
--
Paul M. Foster
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Re: [PHP] database abstraction layer
oh, on using adodb.sf.net and 0-overhead for jumping between mysql and
postgresql;
keep all your queries to as simple early-standard sql as possible.
the auto_increment incompatibilities can be circumvented with a
relatively simple
function getMax($table, $field) {
in adodb, you'd loop through a huge dataset like this, ensuring proper
comms mem-usage betweeen the db server and php.
$dbConn = adoEasyConnection(); //returns adodb connection object,
initialized with values from config.php
$sql = 'select * from data where bladiebla=yep';
$q = $dbConn-execute ($sql);
if (!$q || $q-EOF) {
$errorMsg = $dbConn-ErrorMsg();
handleError ($errorMsg, $sql);
} else {
while (!$q-EOF) {
//use $q-fields['field_name']; // from the currently loaded record
$q-MoveNext();
}
}
for short resultsets you could call $q-getRows() to get all the rows
returned as 1 multilevel array.
instead of difficult outer-join constructs and stored procedures,
(that are not portable), i find it much easier to aim for small
intermediate
computation-result arrays in php, which are used to construct
fetch-final-result-sql on the fly.
itnermediate / result arrays can be stored on db / disk in json, too ;)
i built a cms that can store media items and their meta-properties in db,
with the ability to update some meta-properties of an arbitrary
selection of media items to new
values, in 1 go.
i had no problem switching from postgresql to mysql, at all, using the
methods described above.
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Re: [PHP] database abstraction layer
On Tue, 2010-02-02 at 23:19 +0100, Rene Veerman wrote: function getMax($table, $field) If I saw this sort of code I'd be appalled! It's possibly the worst way to get the auto increment value. You won't notice it testing the site out on your own, but all hell will break loose when you start getting a lot of hits, and two people cause an auto increment at the same time! Thanks, Ash http://www.ashleysheridan.co.uk
Re: [PHP] Magento shopping cart
Hey all, So I'm more comfortable all the time with using Magento, more I read, and Ryan said, Its great, I have been using it for over 2 years very flexible platform very easy to manipulate, and the end user admin is second to none mate. ... Mate?... Are there Aussies on this list? ;) Anyway, what about skinning this animal. If I install it will our designer be able to put the site's custom look and feel into it? Ryan, what do you think? Skip Nathan Nobbe wrote: On Mon, Feb 1, 2010 at 3:22 PM, Skip Evans s...@bigskypenguin.com wrote: I'm not totally opposed to using Magento, though I can see my comments, especially if it's what the client wants. I have been looking over the site and it does have a lot of features so I can see it saving some serious time, especially given the extras he wants. So Nathan, having used it, do you have any tips for a Magento newbie when it comes to integrating it with a custom site? I havent used it yet, but we are considering using it as a second-gen platform at my new place of biz. initial glimpses are promising, but it appears to be a somewhat complex offering compared to say wordpress w/ an e-commerce plugin. i imagine there may be other tradeoffs as well, like a number of general purpose plugins and probly more look feel options in wordpress than magento. I haven't found any integration documentation for programmers yet. google for magento extension and it looks like you may have to hit the appropriate mailing list for more details. fwiw, afaik, x-cart is one of those older e-commerce platforms circa os-commerce / zencart days. the code is ass, but frankly that damn thing has installations up all over the net (or did once upon a time, lol). -nathan -- Skip Evans PenguinSites.com, LLC 503 S Baldwin St, #1 Madison WI 53703 608.250.2720 http://penguinsites.com Those of you who believe in telekinesis, raise my hand. -- Kurt Vonnegut -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
i haven't had the pleasure yet of writing for sites that generate so many hits/sec that they'd update the max value of any table at exactly the same time. i usually ask for the max value about 2 milliseconds before doing the insert. And if the insert fails, i can auto-retry via a wrapper function after sleep(rand(1,3)); I dare say i could work this way at facebook g (not that i really want to, happy with where i am) On Tue, Feb 2, 2010 at 11:46 PM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: On Tue, 2010-02-02 at 23:19 +0100, Rene Veerman wrote: function getMax($table, $field) If I saw this sort of code I'd be appalled! It's possibly the worst way to get the auto increment value. You won't notice it testing the site out on your own, but all hell will break loose when you start getting a lot of hits, and two people cause an auto increment at the same time! Thanks, Ash http://www.ashleysheridan.co.uk
Re: [PHP] database abstraction layer
On Wed, 2010-02-03 at 00:05 +0100, Rene Veerman wrote: i haven't had the pleasure yet of writing for sites that generate so many hits/sec that they'd update the max value of any table at exactly the same time. i usually ask for the max value about 2 milliseconds before doing the insert. And if the insert fails, i can auto-retry via a wrapper function after sleep(rand(1,3)); I dare say i could work this way at facebook g (not that i really want to, happy with where i am) On Tue, Feb 2, 2010 at 11:46 PM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: On Tue, 2010-02-02 at 23:19 +0100, Rene Veerman wrote: function getMax($table, $field) If I saw this sort of code I'd be appalled! It's possibly the worst way to get the auto increment value. You won't notice it testing the site out on your own, but all hell will break loose when you start getting a lot of hits, and two people cause an auto increment at the same time! Thanks, Ash http://www.ashleysheridan.co.uk I saw it happen on a site that was getting only about 3000 hits a day. It just takes the right combination of circumstances and it all goes pear shaped. You really should get out of the habit of doing it. Thanks, Ash http://www.ashleysheridan.co.uk
Re: [PHP] database abstraction layer
and after the sleep(rand(1,3)) it might need a short loop like this;
$rnd = rand(1,9); $a=0;
for ($i=0; $i$rnd; $i++) { $a++ }
to further randomize the retry attempt..
On Wed, Feb 3, 2010 at 12:05 AM, Rene Veerman rene7...@gmail.com wrote:
i haven't had the pleasure yet of writing for sites that generate so many
hits/sec that
they'd update the max value of any table at exactly the same time.
i usually ask for the max value about 2 milliseconds before doing the
insert.
And if the insert fails, i can auto-retry via a wrapper function after
sleep(rand(1,3));
I dare say i could work this way at facebook g (not that i really want
to, happy with where i am)
On Tue, Feb 2, 2010 at 11:46 PM, Ashley Sheridan a...@ashleysheridan.co.uk
wrote:
On Tue, 2010-02-02 at 23:19 +0100, Rene Veerman wrote:
function getMax($table, $field)
If I saw this sort of code I'd be appalled! It's possibly the worst way to
get the auto increment value. You won't notice it testing the site out on
your own, but all hell will break loose when you start getting a lot of
hits, and two people cause an auto increment at the same time!
Thanks,
Ash
http://www.ashleysheridan.co.uk
Re: [PHP] database abstraction layer
eh thats randomize the timing of the retry attempt..
On Wed, Feb 3, 2010 at 12:17 AM, Rene Veerman rene7...@gmail.com wrote:
and after the sleep(rand(1,3)) it might need a short loop like this;
$rnd = rand(1,9); $a=0;
for ($i=0; $i$rnd; $i++) { $a++ }
to further randomize the retry attempt..
Re: [PHP] database abstraction layer
the auto_increment sytnax is not uniform across servers, is it? On Wed, Feb 3, 2010 at 12:11 AM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: I saw it happen on a site that was getting only about 3000 hits a day. It just takes the right combination of circumstances and it all goes pear shaped. You really should get out of the habit of doing it.
Re: [PHP] database abstraction layer
On Wed, 2010-02-03 at 00:17 +0100, Rene Veerman wrote:
and after the sleep(rand(1,3)) it might need a short loop like this;
$rnd = rand(1,9); $a=0;
for ($i=0; $i$rnd; $i++) { $a++ }
to further randomize the retry attempt..
On Wed, Feb 3, 2010 at 12:05 AM, Rene Veerman rene7...@gmail.com wrote:
i haven't had the pleasure yet of writing for sites that generate so many
hits/sec that
they'd update the max value of any table at exactly the same time.
i usually ask for the max value about 2 milliseconds before doing the
insert.
And if the insert fails, i can auto-retry via a wrapper function after
sleep(rand(1,3));
I dare say i could work this way at facebook g (not that i really want
to, happy with where i am)
On Tue, Feb 2, 2010 at 11:46 PM, Ashley Sheridan a...@ashleysheridan.co.uk
wrote:
On Tue, 2010-02-02 at 23:19 +0100, Rene Veerman wrote:
function getMax($table, $field)
If I saw this sort of code I'd be appalled! It's possibly the worst way to
get the auto increment value. You won't notice it testing the site out on
your own, but all hell will break loose when you start getting a lot of
hits, and two people cause an auto increment at the same time!
Thanks,
Ash
http://www.ashleysheridan.co.uk
The problem is where 2 people choose the same instant to perform an
action on your site that inserts a record into your db. The db engine
inserts them one after the other, and then responds about the max(id) to
your PHP script. Then, you now have 2 people who have the same max(id)
retrieved, but one of the values is wrong.
Thanks,
Ash
http://www.ashleysheridan.co.uk
Re: [PHP] database abstraction layer
On Wed, 2010-02-03 at 00:21 +0100, Rene Veerman wrote: the auto_increment sytnax is not uniform across servers, is it? On Wed, Feb 3, 2010 at 12:11 AM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: I saw it happen on a site that was getting only about 3000 hits a day. It just takes the right combination of circumstances and it all goes pear shaped. You really should get out of the habit of doing it. It is a MySQL only function. MSSQL has @@IDENTITY, not sure how other engines implement it. Thanks, Ash http://www.ashleysheridan.co.uk
Re: [PHP] database abstraction layer
On Wed, Feb 3, 2010 at 12:18 AM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: The problem is where 2 people choose the same instant to perform an action on your site that inserts a record into your db. The db engine inserts them one after the other, and then responds about the max(id) to your PHP script. Then, you now have 2 people who have the same max(id) retrieved, but one of the values is wrong. well, i only use getmaxid()s for inserts. the timelag between getmaxid() and the insert is so small it'd take 300-800 insert-requests/sec (on that particular table) before an error condition would arise. in which case, a tested piece of sql would fail, and can be routed through the retry functions . These would imo provide ample timing re-randomization, aswell as a measure of stress-relief for both php and mysql server. You may correct me if i'm wrong :) BTW: php core developers: can we have a sleep() that accepts a float? :)
Re: [PHP] database abstraction layer
On Wed, 2010-02-03 at 00:31 +0100, Rene Veerman wrote: On Wed, Feb 3, 2010 at 12:18 AM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: The problem is where 2 people choose the same instant to perform an action on your site that inserts a record into your db. The db engine inserts them one after the other, and then responds about the max(id) to your PHP script. Then, you now have 2 people who have the same max(id) retrieved, but one of the values is wrong. well, i only use getmaxid()s for inserts. the timelag between getmaxid() and the insert is so small it'd take 300-800 insert-requests/sec (on that particular table) before an error condition would arise. in which case, a tested piece of sql would fail, and can be routed through the retry functions . These would imo provide ample timing re-randomization, aswell as a measure of stress-relief for both php and mysql server. You may correct me if i'm wrong :) BTW: php core developers: can we have a sleep() that accepts a float? :) It's the reason transactions exist, to prevent things happening like this. When you have two actions where one is dependent on the other, unless you have a way to tie them together so that they can't be broken, you run the risk of collisions. Thanks, Ash http://www.ashleysheridan.co.uk
Re: [PHP] database abstraction layer
On Wed, Feb 3, 2010 at 12:35 AM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: It's the reason transactions exist, to prevent things happening like this. When you have two actions where one is dependent on the other, unless you have a way to tie them together so that they can't be broken, you run the risk of collisions. Yea, and i wish they'd standarized features like that across sql servers. But they haven't, so i avoid them like the plague. Whatever dependencies and threading problems might arise, there's always the principle that says: If it doesn't work whlie it should work and threading-timing problems are the only possible cause, then by delay by a random timeperiod and retry the query. In really advanced cases, one can work with last-modified timestamps and/or build up a simple sort of work-queue (also in a table), whereby threads inform each other of the status of their computations.
Re: [PHP] Magento shopping cart
Your designer will definitely be able to skin it, it has multi template and skin system, is easy to customize css, images, and html code for each block However, for changing the layout (position of each block), it will require your designer have a little knowledge on Mage's xml layout system (magento had published a book for designer), or you can leave this job to your developer... On Tue, Feb 2, 2010 at 6:04 PM, Skip Evans s...@bigskypenguin.com wrote: Hey all, So I'm more comfortable all the time with using Magento, more I read, and Ryan said, Its great, I have been using it for over 2 years very flexible platform very easy to manipulate, and the end user admin is second to none mate. ... Mate?... Are there Aussies on this list? ;) Anyway, what about skinning this animal. If I install it will our designer be able to put the site's custom look and feel into it? Ryan, what do you think? Skip Nathan Nobbe wrote: On Mon, Feb 1, 2010 at 3:22 PM, Skip Evans s...@bigskypenguin.com wrote: I'm not totally opposed to using Magento, though I can see my comments, especially if it's what the client wants. I have been looking over the site and it does have a lot of features so I can see it saving some serious time, especially given the extras he wants. So Nathan, having used it, do you have any tips for a Magento newbie when it comes to integrating it with a custom site? I havent used it yet, but we are considering using it as a second-gen platform at my new place of biz. initial glimpses are promising, but it appears to be a somewhat complex offering compared to say wordpress w/ an e-commerce plugin. i imagine there may be other tradeoffs as well, like a number of general purpose plugins and probly more look feel options in wordpress than magento. I haven't found any integration documentation for programmers yet. google for magento extension and it looks like you may have to hit the appropriate mailing list for more details. fwiw, afaik, x-cart is one of those older e-commerce platforms circa os-commerce / zencart days. the code is ass, but frankly that damn thing has installations up all over the net (or did once upon a time, lol). -nathan -- Skip Evans PenguinSites.com, LLC 503 S Baldwin St, #1 Madison WI 53703 608.250.2720 http://penguinsites.com Those of you who believe in telekinesis, raise my hand. -- Kurt Vonnegut -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
Yep, love those race conditions. We have them all over the app cuz the app ciders don't know shit! Bastien Sent from my iPod On Feb 2, 2010, at 5:46 PM, Ashley Sheridan a...@ashleysheridan.co.uk wrote: On Tue, 2010-02-02 at 23:19 +0100, Rene Veerman wrote: function getMax($table, $field) If I saw this sort of code I'd be appalled! It's possibly the worst way to get the auto increment value. You won't notice it testing the site out on your own, but all hell will break loose when you start getting a lot of hits, and two people cause an auto increment at the same time! Thanks, Ash http://www.ashleysheridan.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
Good lord that is exacty the same logic applied in our app. It only takes about 100 users to create the issue. Bastien Sent from my iPod On Feb 2, 2010, at 6:05 PM, Rene Veerman rene7...@gmail.com wrote: i haven't had the pleasure yet of writing for sites that generate so many hits/sec that they'd update the max value of any table at exactly the same time. i usually ask for the max value about 2 milliseconds before doing the insert. And if the insert fails, i can auto-retry via a wrapper function after sleep(rand(1,3)); I dare say i could work this way at facebook g (not that i really want to, happy with where i am) On Tue, Feb 2, 2010 at 11:46 PM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: On Tue, 2010-02-02 at 23:19 +0100, Rene Veerman wrote: function getMax($table, $field) If I saw this sort of code I'd be appalled! It's possibly the worst way to get the auto increment value. You won't notice it testing the site out on your own, but all hell will break loose when you start getting a lot of hits, and two people cause an auto increment at the same time! Thanks, Ash http://www.ashleysheridan.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
Rene Veerman wrote: i haven't had the pleasure yet of writing for sites that generate so many hits/sec that they'd update the max value of any table at exactly the same time. i usually ask for the max value about 2 milliseconds before doing the insert. And if the insert fails, i can auto-retry via a wrapper function after sleep(rand(1,3)); I dare say i could work this way at facebook g (not that i really want to, happy with where i am) This is a race condition... all you need are two hits per day... one from person A and one from person B. If they happen within short enough temporal proximity then the race is on. Now... a big fat lock around the table before the request for max ID and the insert query ought to mitigate your issue. Although I wouldn't call my function getMaxId() I would call it getNextId() :) Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
Rene Veerman wrote:
eh thats randomize the timing of the retry attempt..
On Wed, Feb 3, 2010 at 12:17 AM, Rene Veerman rene7...@gmail.com wrote:
and after the sleep(rand(1,3)) it might need a short loop like this;
$rnd = rand(1,9); $a=0;
for ($i=0; $i$rnd; $i++) { $a++ }
to further randomize the retry attempt..
While this decreases the probability of a collision you're just setting
up another race. They teach about this stuff in computer science...
right around first year... or at least they once upon a time did.
Cheers,
Rob.
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Application and Templating Framework for PHP
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Re: [PHP] database abstraction layer
Rene Veerman wrote: On Wed, Feb 3, 2010 at 12:18 AM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: The problem is where 2 people choose the same instant to perform an action on your site that inserts a record into your db. The db engine inserts them one after the other, and then responds about the max(id) to your PHP script. Then, you now have 2 people who have the same max(id) retrieved, but one of the values is wrong. well, i only use getmaxid()s for inserts. the timelag between getmaxid() and the insert is so small it'd take 300-800 insert-requests/sec (on that particular table) before an error condition would arise. in which case, a tested piece of sql would fail, and can be routed through the retry functions . These would imo provide ample timing re-randomization, aswell as a measure of stress-relief for both php and mysql server. You may correct me if i'm wrong :) BTW: php core developers: can we have a sleep() that accepts a float? :) This works right up until someone else maintains this system and can't understand why the database is corrupt. Then they find find your database layer and want to stab themselves :) Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
Michael A. Peters wrote:
Robert Cummings wrote:
Rene Veerman wrote:
eh thats randomize the timing of the retry attempt..
On Wed, Feb 3, 2010 at 12:17 AM, Rene Veerman rene7...@gmail.com wrote:
and after the sleep(rand(1,3)) it might need a short loop like this;
$rnd = rand(1,9); $a=0;
for ($i=0; $i$rnd; $i++) { $a++ }
to further randomize the retry attempt..
While this decreases the probability of a collision you're just setting
up another race. They teach about this stuff in computer science...
right around first year... or at least they once upon a time did.
Cheers,
Rob.
Einstein I believe said something along the lines of
A smart person solves a problem.
A wise person avoids it in the first place
Might not have been Einstein, but anyway ...
Do you mean the following quote?
The difference between a smart person and a wise person is that
a smart person knows what to say and a wise person knows whether
or not to say it.
Cheers,
Rob.
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Application and Templating Framework for PHP
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Re: [PHP] database abstraction layer
Robert Cummings wrote: *snip* Einstein I believe said something along the lines of A smart person solves a problem. A wise person avoids it in the first place Might not have been Einstein, but anyway ... Do you mean the following quote? The difference between a smart person and a wise person is that a smart person knows what to say and a wise person knows whether or not to say it. Cheers, Rob. No - this is it: http://www.famousquotes.com/show/1022246/ “A clever person solves a problem. A wise person avoids it.” -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
On Tue, Feb 02, 2010 at 11:19:29PM +0100, Rene Veerman wrote:
oh, on using adodb.sf.net and 0-overhead for jumping between mysql and
postgresql;
keep all your queries to as simple early-standard sql as possible.
the auto_increment incompatibilities can be circumvented with a
relatively simple
function getMax($table, $field) {
This approach is guaranteed to run into race conditions. The only way to
positively ensure proper results is to let the DB engine take care of it
itself. The engines typically track incremental IDs by session, which
prevents you from getting an ID someone else has just used.
in adodb, you'd loop through a huge dataset like this, ensuring proper
comms mem-usage betweeen the db server and php.
$dbConn = adoEasyConnection(); //returns adodb connection object,
initialized with values from config.php
$sql = 'select * from data where bladiebla=yep';
$q = $dbConn-execute ($sql);
if (!$q || $q-EOF) {
$errorMsg = $dbConn-ErrorMsg();
handleError ($errorMsg, $sql);
} else {
while (!$q-EOF) {
//use $q-fields['field_name']; // from the currently loaded record
$q-MoveNext();
}
}
for short resultsets you could call $q-getRows() to get all the rows
returned as 1 multilevel array.
instead of difficult outer-join constructs and stored procedures,
(that are not portable), i find it much easier to aim for small
intermediate
computation-result arrays in php, which are used to construct
fetch-final-result-sql on the fly.
itnermediate / result arrays can be stored on db / disk in json, too ;)
For MySQL I would agree. But I prefer the ability to use the full SQL
standard when manipulating a database; that is, all joins, foreign keys,
etc. For that same reason, I tend to avoid stored procedures as well. If
I have to do things like handle foreign key constraints in my PHP code
(instead of letting the DBMS handle them), I have to wonder why I'm even
using a relational DBMS.
Paul
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Re: [PHP] database abstraction layer
Lol, damn iPod corrections. The app designers is what was meant. Bastien Sent from my iPod On Feb 2, 2010, at 8:41 PM, Robert Cummings rob...@interjinn.com wrote: Phpster wrote: Yep, love those race conditions. We have them all over the app cuz the app ciders don't know shit! Mmmm... apple cider... to cure what ails you or at least get you drunk enough to not care about the horrible race conditions :) Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] DOM TextArea (and dom chart please)
On Tue, Feb 2, 2010 at 2:29 PM, Ryan S gen...@yahoo.com wrote:
Hey!
i'm just starting with PHP's DOM-XML and need a little help please.
Basically, first i am trying to see if a input like a textbox has a 'VALUE='
associated with it, if yes, i leave it be, if no, i add a default value.
This *is working* as can be seen by the attached code below.
But a bit confused as to how to do the same for a textarea as textarea's do
not have a 'VALUE=' attribute.
Heres my code:
$website_data = file_get_contents('dom_test.html');//load the website data,
$dom = new DomDocument; //make a new DOM container in PHP
$dom-loadHTML($website_data); //load all the fetched data into the DOM
container
[snip]
// * now we come to the textarea bit that is not working *
$inputs2 = $dom-getElementsByTagName('textarea'); // Find textareas
foreach ($inputs2 as $input2) {
if(!$input2-firstChild.nodeValue==) {
$input2-firstChild.nodeValue==it works!;
}
}
echo $dom-saveHTML();
?
+++
// I have even tried this instead of the above:
foreach ($inputs2 as $input2) {
if(!$input2-getAttribute(defaultValue)==) {
$input2-setAttribute(defaultValue,it works!);
}
}
but no joy.
I'm betting its pretty simple but i dont have a DOM chart for php, the only
ones i have been able to find via google are for javascript like this one:
http://www.hscripts.com/tutorials/javascript/dom/textarea-events.php
and that chart does not help much. Does anyone have a PHP DOM chart or a
resource that i can use to get started using this?
Thanks in advance!
Ryan
I think what you are looking for is $input2-textContent in PHP.
Andrew
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Re: [PHP] database abstraction layer
Op 2/3/10 12:19 AM, Ashley Sheridan schreef: On Wed, 2010-02-03 at 00:21 +0100, Rene Veerman wrote: the auto_increment sytnax is not uniform across servers, is it? On Wed, Feb 3, 2010 at 12:11 AM, Ashley Sheridan a...@ashleysheridan.co.ukwrote: I saw it happen on a site that was getting only about 3000 hits a day. It just takes the right combination of circumstances and it all goes pear shaped. You really should get out of the habit of doing it. It is a MySQL only function. MSSQL has @@IDENTITY, not sure how other engines implement it. firebird does it via what they call 'generators', 2 seconds of searching shows postgres has this: CREATE TABLE tableName ( id serial PRIMARY KEY, name varchar(50) UNIQUE NOT NULL, dateCreated timestamp DEFAULT current_timestamp ); you can bet you ass that every other DB out there that's worth it's salt has atomic id incrementor functionality exposed in some way or other. @Rene: all that talk of maxId functions and random retries etc, etc, is complete pooh. don't do it, **please** use the proper tools provided by the DB in question. Thanks, Ash http://www.ashleysheridan.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
On Wed, Feb 3, 2010 at 5:49 AM, Jochem Maas joc...@iamjochem.com wrote: you can bet you ass that every other DB out there that's worth it's salt has atomic id incrementor functionality exposed in some way or other. @Rene: all that talk of maxId functions and random retries etc, etc, is complete pooh. don't do it, **please** use the proper tools provided by the DB in question. i just checked how my 1 app that did generate over a million hits/day (all with an insert for stats purposes) for a few weeks handles the getMax issue, and i see i did use mysql's auto_increment there. i suppose the difference in syntax between sql servers for this one is acceptable. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] database abstraction layer
On Wed, Feb 03, 2010 at 06:39:29AM +0100, Rene Veerman wrote: On Wed, Feb 3, 2010 at 5:49 AM, Jochem Maas joc...@iamjochem.com wrote: you can bet you ass that every other DB out there that's worth it's salt has atomic id incrementor functionality exposed in some way or other. @Rene: all that talk of maxId functions and random retries etc, etc, is complete pooh. don't do it, **please** use the proper tools provided by the DB in question. i just checked how my 1 app that did generate over a million hits/day (all with an insert for stats purposes) for a few weeks handles the getMax issue, and i see i did use mysql's auto_increment there. i suppose the difference in syntax between sql servers for this one is acceptable. Am I the only one who's seeing Rene's replies but not the posts which generated them? Paul -- Paul M. Foster -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
