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Re: [Zope] Using "Session" to store per-session data.
by Christopher Petrilli 14 Sep '99

14 Sep '99

> In my opinion it's getting increasingly obvious that the ZODB badly > needs cheap, non-undoable, "transient" transactions. > > Counters, sessions, often-refreshed internal state tables -- lots of > applications need it, and moving this stuff outside the ZODB breaks with > the object-oriented design. > > How it's actually implemented is irrelevant, be it in-memory or > file-based, but in its simplest form it should not be difficult to do. Jim can better speak to this, but it's more difficult than it looks (see the UML model for more information), but has to do with supporting multiple databases in the same tree. We already have a few storage mechanisms that don't support undo or versions., it's simply the integration into the full system that is more complex. Patches, as always, are accepted. :-) Chris -- | Christopher Petrilli Python Powered Digital Creations, Inc. | petrilli(a)digicool.com http://www.digicool.com

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Re: [Zope] Error compiling ZMySQLDA with Zope 2.0
by Christopher Petrilli 14 Sep '99

14 Sep '99

> Does this mean that the MySQL database could be corrupted if I > *don't* set '-t 1' when starting Zope? Well, a complex question in a database without transactions, there's always room for corruption :-) But yes, the likelyhood is much higher I would suspect. In this case all Zope transactions are serialized, so you wouldn't have two different threads trying to change it at the same time. Chris -- | Christopher Petrilli Python Powered Digital Creations, Inc. | petrilli(a)digicool.com http://www.digicool.com

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RE: [Zope] Using "Session" to store per-session data.
by Alexander Staubo 14 Sep '99

14 Sep '99

In my opinion it's getting increasingly obvious that the ZODB badly needs cheap, non-undoable, "transient" transactions. Counters, sessions, often-refreshed internal state tables -- lots of applications need it, and moving this stuff outside the ZODB breaks with the object-oriented design. How it's actually implemented is irrelevant, be it in-memory or file-based, but in its simplest form it should not be difficult to do. -- Alexander Staubo http://www.mop.no/~alex/ "`Ford, you're turning into a penguin. Stop it.'" --Douglas Adams, _The Hitchhiker's Guide to the Galaxy_ > -----Original Message----- > From: Anthony Baxter [mailto:anthony@interlink.com.au] > Sent: 14. september 1999 10:57 > To: Paul Everitt > Cc: Tony McDonald; zope(a)zope.org > Subject: Re: [Zope] Using "Session" to store per-session data. > > > >>> Paul Everitt wrote > > I wonder why you think the ZODB isn't the place to do this? > > If it is because of the versioning issue: > > It is indeed because of the versioning issue. > > > 1) You can create a special datastructure that doesn't > version on every > > commit, but instead perhaps every minute. Think of it as halfway > > between volatile and persistent. > > That's still going to be an awfully large number of objects in the DB. > And it'll blow the undo log to hell... > > > 2) One of these days we'll come out with a non-versioning > Storage class, > > plus allow people to mix Storages in the same process. > > At that point, I think it would be useful to reconsider storing things > like webcounters and sessions in the ZODB. > > > 3) Then again, perhaps people could live with the 20 byte > or so growth > > on each Session commit. > > not really. If you look at a different way - committing once a minute > means that it's one commit per minute, per current user of > the web site. > More importantly, if you do have to bounce Zope for some reason, > then all active users will suddenly find their web sessions rewinding > backwards by up to a minute. One of the main things I'm using this for > is for multi-page forms - having the session suddenly rewind would be > very confusing for a user... > > _______________________________________________ > 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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python ignorance shining through...
by Tony McDonald 14 Sep '99

14 Sep '99

Hi all, I've got an external method that does an SQL lookup and retrieves (essentially) two fields, tagclass and content. What I'm doing at the moment is; if tagclass == 'modulecontributor': template_str = self.RENDER.modulecontributor.read_raw() template = DocumentTemplate.HTML(template_str) theresult = template(self, content=content) return theresult How can I do something like; try: template_str = self.RENDER.(the contents of tagclass).read_raw() template = DocumentTemplate.HTML(template_str) theresult = template(self, content=content) return theresult except KeyError: return "no renderer for %s" % tagclass any pointers gratefully received.. tone ------ Dr Tony McDonald, FMCC, Networked Learning Environments Project http://nle.ncl.ac.uk/ The Medical School, Newcastle University Tel: +44 191 222 5888 Fingerprint: 3450 876D FA41 B926 D3DD F8C3 F2D0 C3B9 8B38 18A2

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Re: getting a folderish zclass to automatically add things to itself
by Anthony Baxter 14 Sep '99

14 Sep '99

[I was going to give up and go home, but noooo, I'm stubborn] Ok, the trick is that inside the _add method of the ZClass, you don't have the Product in the Acquisition path. So inside the <dtml-with> of the standard _add method, you need to do something like <dtml-with "manage_addProduct['ProductName']"> <dtml-call "REQUEST.set('id', 'defaults')"> <dtml-call "InstanceData_add(_.None, _, NoRedir=1)"> <dtml-call "manage_addFolder(id='Instances')"> </dtml-with> aarggrgrgggg. Still, now I know... :) Anthony >>> Anthony Baxter wrote > I've been hammering my head against this - I'm trying to get a folderish > ZClass to add a couple of instances of a different ZClass to itself when > it's created. I've looked at Kevin's ZClass How-to (the bit at the bottom > of it needs a <pre>, btw) and I've tried various versions of trying to > call the createInObjectManager inside the _add page of the ZClass... > These all result in creating the object in the parent folder of the new > folderish object. > > I know I'm missing something really really stupid. Can someone help me > here? > > Anthony -- Anthony Baxter <anthony(a)interlink.com.au> It's never too late to have a happy childhood.

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Zope/manage problem
by Scott Thomas Haug 14 Sep '99

14 Sep '99

Hello! After much struggle, I finally got Zope 2.0 working on my Mandrake 6.1b linux system. I first got it working with the Zserver, then without it (just Apache + PCGI). I had to make some accessibility changes to a couple of the files that weren't described in any of the docs (as far as I could tell), but that isn't important at the moment. So, its working, mostly... I open up Netscape, go to http://my.computers.address.org/Zope/manage, enter my superuser login and password, and voila!---I'm in the Zope manage menu. Everything seems to be working great---I can add users, objects, the works. But the buttons on the main page ([Rename] [Cut] [Copy] [Delete] [Export...]) don't work. Pressing any of them, regardless of what I've checked off in the menu, gives me a "404 Not Found" error. I've done a little diagnostics and checked out the httpd log files. Every time I press one of those buttons, the server tries to find something in /home/httpd/html/Zope. But there is no Zope file or directory in the html directory---I only have a Zope.cgi in the /home/httpd/cgi-bin directory. The log entry is as follows: [Mon Sep 13 22:33:06 1999] [error] [client 216.63.52.0] File does not exist: /home/httpd/html/Zope Has anyone else experienced this problem? I couldn't find any mention of it in the distribution docs, online faqs and guides, or in the mailing list archives. My Zope.cgi file looks like this (unchanged from what was generated by the installation precess): #!/usr/local/Zope-2.0.0/pcgi/pcgi-wrapper PCGI_NAME=Zope PCGI_MODULE_PATH=/usr/local/Zope-2.0.0/lib/python/Zope PCGI_PUBLISHER=/usr/local/Zope-2.0.0/pcgi/pcgi_publisher.py PCGI_EXE=/usr/bin/python PCGI_SOCKET_FILE=/usr/local/Zope-2.0.0/var/pcgi.soc PCGI_PID_FILE=/usr/local/Zope-2.0.0/var/pcgi.pid PCGI_ERROR_LOG=/usr/local/Zope-2.0.0/var/pcgi.log PCGI_DISPLAY_ERRORS=1 BOBO_REALM=/usr/local/Zope-2.0.0/Zope.cgi BOBO_DEBUG_MODE=1 INSTANCE_HOME=/usr/local/Zope-2.0.0 The only other change I made was the following addition to /etc/httpd/conf/httpd.conf (again, as described in the docs): # Zope configuration maps /Zope/ to the Zope.cgi PCGI script RewriteEngine on RewriteCond %{HTTP:Authorization} ^(.*) RewriteRule ^/Zope/(.*) /home/httpd/cgi-bin/Zope.cgi/$1 [e=HTTP_CGI_AUTHORIZATION:%1,t=application/x-httpd-cgi,l] Any assistance with this is greatly appreciated. Thanks, -Scott

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How do you do the printable page link as per Zope site standard f ooter? ooter?
by Andrew Bunney 14 Sep '99

14 Sep '99

Having had a good look at the docs etc I can't find out how to do the printable page link as per Zope site standard footer. Can anyone tell me how to to this? Thanks Andrew _________________________________________________________________________ Andrew Bunney, Learning Design Demonstrator, Business School, Bournemouth University, UK

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Representing an external server in a tree?
by Andrew Bunney 14 Sep '99

14 Sep '99

I am building framed online learning environments and I am very new to zope. Lot's of it's features say migrate from a static site especially navigation trees which I currently do in JavaScript by hand. I think I could bring in projects 6 months early. If I did I could concentrate on content rather than architecture and maintenance. However I still need to reference external webservers within the navigation tree. The only way I can see of doing this is to upload a HTML document as a file and have it meta refresh to the external website which runs automated assessment software. Is there a more elegant way of doing this? Thanks Andrew Bunney Learning Design Demonstrator Business School, Bournemouth University, UK.

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getting a folderish zclass to automatically add things to itself
by Anthony Baxter 14 Sep '99

14 Sep '99

I've been hammering my head against this - I'm trying to get a folderish ZClass to add a couple of instances of a different ZClass to itself when it's created. I've looked at Kevin's ZClass How-to (the bit at the bottom of it needs a <pre>, btw) and I've tried various versions of trying to call the createInObjectManager inside the _add page of the ZClass... These all result in creating the object in the parent folder of the new folderish object. I know I'm missing something really really stupid. Can someone help me here? Anthony

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Important database corrupted! Please help!
by Martin Dougiamas 14 Sep '99

14 Sep '99

Hi, I've been running an application with Zope 1.10.2 for some months now, collecting important data. It's been stable and terrific. Unfortunately, a disk full error has caused corruption of the Data.bbb file. :-( :-( I need to recover it! The corruption is occuring at 508093 byes, but the full Data.bbb file is actually 16010912 bytes! Truncating the file at 508093 does allow Zope to start up, at least, but almost all of my data is gone. Help! Here's the error message:  -- ### Martin Dougiamas -- Internet Agent "...The Eighties, ### Centre for Educational Advancement the Nineties, ### http://cea.curtin.edu/staff/martin the Naughties."

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