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Uppercasing a string in a ZSQL method?
by Scott Anderson 28 Sep '99

28 Sep '99

I've tried the following to change a string to upper case in a ZSQL method: <dtml-sqlvar sNewAcctNo type=string upper> (doesn't work; sqlvar doesn't define 'upper') <dtml-let sNewAcctNo="_.upper(sNewAcctNo)"> (doesn't work; exceptions.AttributeError) <dtml-let sNewAcctNo="string.upper(sNewAcctNo)"> (doesn't work; exceptions.NameError) <dtml-let sNewAcctNo="upper(sNewAcctNo)"> (doesn't work; exceptions.NameError) What am I missing? Thanks in advance, -scott

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upload error
by Robin Becker 28 Sep '99

28 Sep '99

A colleague is getting this error when trying to add a large file with ID UK99.zip I'm fairly sure that the file exists. Adding a test file worked OK. Zope Error Zope has encountered an error while publishing this resource. Error Type: NameError Error Value: invalid Troubleshooting Suggestions This resource may be trying to reference a nonexistent object or variable invalid. The URL may be incorrect. The parameters passed to this resource may be incorrect. A resource that this resource relies on may be encountering an error. For more detailed information about the error, please refer to the HTML source for this page. If the error persists please contact the site maintainer. Thank you for your patience. Traceback (innermost last): File C:\Python\devel\Zope\lib\python\ZPublisher\Publish.py, line 214, in publish_module File C:\Python\devel\Zope\lib\python\ZPublisher\Publish.py, line 179, in publish File C:\Python\devel\Zope\lib\python\Zope\__init__.py, line 201, in zpublisher_exception_hook File C:\Python\devel\Zope\lib\python\ZPublisher\Publish.py, line 165, in publish File C:\Python\devel\Zope\lib\python\ZPublisher\mapply.py, line 160, in mapply (Object: manage_addFile) File C:\Python\devel\Zope\lib\python\ZPublisher\Publish.py, line 102, in call_object (Object: manage_addFile) File C:\Python\devel\Zope\lib\python\OFS\Image.py, line 119, in manage_addFile (Object: ElementWithAttributes) File C:\Python\devel\Zope\lib\python\OFS\Image.py, line 239, in manage_upload File C:\Python\devel\Zope\lib\python\OFS\Image.py, line 311, in _read_data File C:\Python\devel\Zope\lib\python\ZODB\Transaction.py, line 237, in commit File C:\python\devel\Zope\lib\python\ZODB\Connection.py, line 300, in commit NameError: (see above) -- Robin Becker

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Re: [Zope] Zope in Portals
by Christopher Petrilli 28 Sep '99

28 Sep '99

> Here's the current line on transactions in MySQL from the 3.22.26a docs: > > """5.3.3 Transactions > > Transactions are not supported. MySQL shortly will support atomic > operations, which are like transactions without rollback. With atomic > operations, you can execute a group of INSERT/SELECT/whatever commands and > be guaranteed that no other thread will interfere. In this > context, you won't usually need rollback. Currently, you can prevent > interference from other threads by using the LOCK TABLES and UNLOCK > TABLES commands. See section 7.23 LOCK TABLES/UNLOCK TABLES syntax. > """ This is almost useless, perhaps even worse than :-) We REALLY REALLY need rollback capabilities to function correctly. Otherwise, if you raise an exception somewhere, how do you abort it and roll back all changes? > def _begin(self): > self.db.query('begin transaction') This is called at the beginning of all transaction. > def _finish(self): > self.db.query('commit transaction') This is like a "commit" but tells it to do whatever is necessary ot commit the transaction. > def _abort(self): > self.db.query('rollback transaction') Duh :-) > (For a Python DB API-style interface, _begin would pass, _finish would do > self.db.commit(), and _abort would do self.db.rollback().) _begin might or might not pass. It's really dependent on the database :-) Some databases have implicit transaction starts, we don't like them :-) > There are a couple possibilities for implementing transactions in > ZMySQLDA: > > 1) Automatic use of LOCK TABLES. > Excuse me while I lose my lunch. :-) This is so amazingly hackish as to almost be a joke. This *might* work partially in some half-brain-dead fashion in a single-threaded, non concurrent environment, but when you have other situations where you might have two people touching tables at the same time, in some cases dependent on each other... This is where "SELECT * FROM UPDATE" comes from. You have to tell the database that you plan to use some data in a calculation that you will then modify some other table based on, and you don't want someone playing with that core data while you're in the middle of your transaction. This is just the tip of the concurrency iceberg. It's all about keeping your data sane under load. I can write all kinds of hacks that will fix it in low usage situations, but will they hold up with 100+ concurrent users? Not to slam MySQL, but... it has it's place, but I'm not sure it's under heavy update loads. Chris -- | Christopher Petrilli Python Powered Digital Creations, Inc. | petrilli(a)digicool.com http://www.digicool.com

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RE: [Zope] FreeBSD : anyone else noticed kernel "table full" errors whenZope is installed ? Zope is installed ?
by Thaxter, Jason M. 28 Sep '99

28 Sep '99

I have had the same setup without having this problem. Python is something of a cpu hog, and I have managed (during load testing) to overload it once or twice (kernel message: Python exited on signal 11) causing a need to restart Zope. Once I even bounced the box. But once I started running Zope with more threads (8), I was no longer able to kill anything, even when it got swamped. Could you have some issue with disk space or inodes on one of your relevant filesystems? > -----Original Message----- > From: chas [mailto:panda@skinnyhippo.com] > Sent: Tuesday, September 28, 1999 5:17 AM > To: zope(a)zope.org > Subject: [Zope] FreeBSD : anyone else noticed kernel "table > full" errors > whenZope is installed ? Zope is installed ? > > > I have 4 almost identical servers : > - FreeBSD 3.2 > - MySQL > - Apache 1.3.6 > > All were running various websites using CGI scripts. > All were stable and have more than sufficient resources. > > I've since installed Zope on 3 of them and all 3 in question > have subsequently started throwing up the following > kernel log messages as soon as Zope is installed (running > on the backend of Apache) : > > > file: table is full > > file: table is full > > file: table is full > > file: table is full > > file: table is full > > This is easily resolved by increasing the MAXUSERS in the > kernel but what worries me is that I should even need to > do this. One of the boxes was handling 2 million hits > per day last month without creating these kernel errors. > > I am tempted to assume that this is all due to Zope because > the correlation is so strong - run Zope and these errors occur, > don't run zope and don't get any. Even for one of the servers > that is still offline with zero traffic. > > Has anyone else experienced this on FreeBSD ? > Any reason why this might be Zope-induced ? > > cheers, > > chas > > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://www.zope.org/mailman/listinfo/zope > > (To receive general Zope announcements, see: > http://www.zope.org/mailman/listinfo/zope-announce > > For developer-specific issues, zope-dev(a)zope.org - > http://www.zope.org/mailman/listinfo/zope-dev ) >

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Re: [Zope] Zclass VS ZSQL,Which is easier!
by chas 28 Sep '99

28 Sep '99

At 03:37 PM 9/28/99 +0800, Victor Zhai wrote: >Hello: all > Can Zclass provider some method of it's own. Yes. A Zclass is, wait for it, a class. It has properties and methods. >Just like Products Some products are built with Zclasses > Whick is more easy to operate ,Zsql or Zclass. This is a strange question. It's like asking 'which is better - a battle-tank or a bicycle ?' ... it all depends what you want to do. ZSql and Zclasses serve different purposes. Your Zclass may use ZSQL methods. > if so,Please give me some advice about that. I think the best thing you could right now is : a) create a ZSQL method using the tutorial - it's very easy b) create a simple ZClass using the tutorial - it's also easy Just create basic examples of each - you'll soon see what the difference is. Seriously, it will be time well invested. > More,Please give me some document about ZODB,and ZClass examples. We'd all love that. But the Zclass tutorial is good. Lots of information in the archive too. Try using the search. chas ps. you may wish to ask Bjorn Stabell since he works in your company and, judging from your time zone, is probably sat in a cubicle next to your's :) pps. you really shouldn't cross post something like this !

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Zope, Postgresql and Linux
by Kulpinski, Dejan 28 Sep '99

28 Sep '99

Hello, Does anybody know how to link to Postgresql database from Zope under Linux ? I was not able to find ODBC add on for Zope on Linux ... Thanx Dejan Kulpinski

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RE: Re[2]: [Zope] comparing variables from different name spaces?
by Chris McDonough 28 Sep '99

28 Sep '99

I think you're going the "wrong way" with the "-3". The PARENTS object is a Python list of object containers, indexed from 0 to n. PARENTS[0] is the current container. PARENTS[1] is the parent container of the current container. PARENTS[2] is the parent container of the parent container of the current container, et. al. When you say PARENTS[-3], what you're telling Zope you're looking for is the item third from LAST in the list, which in the case you were in /test would not exist, and therefore you get the error. You can check the mailing list for the hasattr method (function?) to check for existence of an object without raising an error (I'm not the one to ask, I've only used it once), if you'd like... But a better solution to this problem was given by Michel Pelletier in his answer to your question, which was to use code like this: <dtml-with test> <dtml-if "dir2 in PARENTS"> dir2 is one of your parents </dtml-if> </dtml-with> What this does in the expression "dir2 in PARENTS" is say, "iterate over the PARENTS list, and return true if dir2 is a member of the list". Am I making any sense? -----Original Message----- From: Ainis [mailto:ainis@mindless.com] Sent: Tuesday, September 28, 1999 11:24 AM To: Chris McDonough; zope(a)zope.org Subject: Re[2]: [Zope] comparing variables from different name spaces? Hello Chris, Well, it almost worked. I had to use <dtml-var "PARENTS[-3].id"> but now I have another problem. This variable does not exist when i make requests in /test/ folder (which is normal, as /test/ has no such parents), in /test/dir2 it works fine. So I tried: <dtml-if "PARENTS[-3].id"> but i get an error if it does not exist. So how do i check if the variable exists? Tuesday, Tuesday, September 28, 1999, you wrote: CM> You can do this by using the PARENTS object. CM> For example, the following (untested) code, when run from CM> http://youserver/test/dir2/hardware/prices/index_html (assuming index_html CM> is a dtml method and not a dtml document -- a dtml document has its own CM> properties) will give you the id of the /test/dir2 folder: CM>  CM> e.g. it will print "dir2" CM> While: CM>  will give you the id of the hardware folder CM> (e.g. it will print "hardware"), et. al. CM> I think this is what you're looking for.. Best regards, Ainis mailto:ainis@mindless.com

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Re: [Zope] Zope in Portals
by Christopher Petrilli 28 Sep '99

28 Sep '99

> 1. It is often mentioned that Zope is very scalable. But how does it scale? > We currently have an architeture that consists in several backends with > SQL databases and NFS servers and about 5 mirrored frontends with Apaches > delivering static and dynamic web pages, load balanced by an Alteon Ace Director > Switch. Would Zope fit in such an environment ? Are there any case studies > or testimonials using something like this? Well this would be something to look at ZEO for, rather than NFS/etc hacks. ZEO does actual object replication and caching (as well as real-time invalidation). Unfortunately, it's available only to consulting customers. Having said that, we are trying to get performance up for general usage as well. Anything under a few million hits a day shouldn't be a problem in the current situation. > 2. How well does Zope performs ? Are there any benchmarks ? I was not > very impressed with the results of an "ab" (Apache Benchmark Program) I > did to Zserver requesting 1000 pages with 200 concurrent requests. And > how bad is it to use PCGI/Apache instead of ZServer ? Is the future > of Zope focused in developing Zserver or integrating Zope well with > other Web Server such as Apache ? Yes. ZServer is a great solution if you're just running HTTP/FTP. Apache is better for including other forms of content. The hit right now is pretty harsh, though it should be getting better once FastCGI support is released (it's done, it just needs to be documented and fully tested). > 3. It seemed to me that Zope doesn't support mySQL very well, being Oracle > mentioned all the time. As mySQL is still our main SQL platform, i ask if > mySQL DA is still being supported and/or developed? Well, we have a bit of an architectural issue with MySQL... we're VERY VERY VERY focused on transaction processing, everything is a transaction in Zope, and the object database implements some very advanced ideas. For application sanity, we expect all databases external to Zope to do the same, and MySQL obviously does not. This has caused us to not develop for it, regardless of its popularity in certain areas. It's simply incompatible with the architecture. Now, having said that, we're more than happy to see other people use it for whatever application they wish; understanding that you could suffer from serious data corruption because of the lack of transactions. Or you can manually lock the database, and wait for it to hit a race-condition. If you're willing to accept these risks, more power to you. Also, supposedly MySQL will get transactions in some form in the future (so I've heard), at which point, I suspect our position will change. For now, we recommend anyone doing heavy SQL work, which contains critical data, to use a database which has a robust transaction system (Oracle, Sybase, etc.). Please understand that one of the primary focuses of Zope is to never loose data, and never corrupt data. Doing so, without any transaction system, is nearly impossible. Chris -- | Christopher Petrilli Python Powered Digital Creations, Inc. | petrilli(a)digicool.com http://www.digicool.com

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RE: [Zope] Are there any modules that do NTLM authentication?
by Chris McDonough 28 Sep '99

28 Sep '99

smbUserFolder.. http://www.zope.org/Members/mcdonc/smbUserFolder -----Original Message----- From: Hunter Kelly [mailto:retnuh@oniva.com] Sent: Tuesday, September 28, 1999 12:57 PM To: zope(a)zope.org Subject: [Zope] Are there any modules that do NTLM authentication? Is there anything written for Python/Zope that manages to do Windows NTLM Authentication? Please CC me on any replies, I'm not yet up to speed enough on Zope to wade through the list. Thanks! Hunter _______________________________________________ Zope maillist - Zope(a)zope.org http://www.zope.org/mailman/listinfo/zope (To receive general Zope announcements, see: http://www.zope.org/mailman/listinfo/zope-announce For developer-specific issues, zope-dev(a)zope.org - http://www.zope.org/mailman/listinfo/zope-dev )

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Are there any modules that do NTLM authentication?
by Hunter Kelly 28 Sep '99

28 Sep '99

Is there anything written for Python/Zope that manages to do Windows NTLM Authentication? Please CC me on any replies, I'm not yet up to speed enough on Zope to wade through the list. Thanks! Hunter

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