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Re: [Zope] one 'document' in many 'folders'
by Stefan Franke 23 Mar '99

23 Mar '99

[Pleased of having caught Jim Fulton in verbose mode 8-] > You can store any complex Python data in the DB subject to: [...] > - Subobjects of persistent objects must be "persistent" or > they must be immutable, or be used immutably, as in: So class Persistent's __setattr__ is basically also the level that transaction and undo support work on? Can I expect the undo support to work if I take care of the persistence rules, regardless of cyclic and acyclic structures? Propably about time to switch to Zope-dev... Stefan

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Re: [Zope] one 'document' in many 'folders'
by Stefan Franke 23 Mar '99

23 Mar '99

Jim Fulton wrote: > Sorry you didn't get an answer. There is no problem with creating > acyclic or cyclic graph constructors in the, uh, object hierarchy, > which BTW, need not be a hierarchy. :) Not too long ago I experimented a little with cyclic structures inside Zope's database. One thing I noticed was, that the copy support failed with tracebacks like this: Traceback (innermost last): File D:\Programme\zope\koelnzope\lib\python\ZPublisher\Publish.py, line 877, in publish_module File D:\Programme\zope\koelnzope\lib\python\ZPublisher\Publish.py, line 590, in publish (Info: /BLS/1000/ADV-Angelegenheiten/manage_pasteObjects) File D:\Programme\zope\koelnzope\lib\python\OFS\CopySupport.py, line 176, in manage_pasteObjects (Object: Navigation) File D:\Programme\zope\koelnzope\lib\python\OFS\CopySupport.py, line 361, in _getCopy (Object: Navigation) File D:\Programme\zope\koelnzope\lib\python\BoboPOS\PickleJar.py, line 327, in export_file File D:\Programme\zope\koelnzope\lib\python\BoboPOS\SimpleDB.py, line 958, in exportoid ExportError: Object 184337 references itself This led me to the conclusion to better leave my hands off non-hierarchic data structures which differ from those created by the management interface itself. >> Would also like to hear more about this... > Like what? :) More or less simple answers like "this is ok and this is not", or "you can store any complex Python data structure inside the DB, but in conjunction with the management interface, you get the following drawbacks.." I'm still a quite unclear about the object management in the database itself and the management layer Zope adds. But maybe I just have to read the docs harder ;-) Stefan >

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Database connections
by Oleg Broytmann 23 Mar '99

23 Mar '99

Hello! I've finished large project using pure CGI concept (I used Neale's html.py). Now I (and my boss) are thinking of switching to Zope, or at least ZTemplates. While playing with Zope and SQL (I am using Postgres, hence ZPygres Database Adapter), I found that Zope, when loaded into memory by Zope.cgi (I am using Apache, and need to use in the future) opens a database connection for every Folder where I created Connection object. It is bad, as I have many databases, so Zope eats up memory. Another problem - what would do Zope if I restart Postgres (so all current connections break)? Would Zope reestablish connections or just report error? How could I limit number of connections Zope opens? How could I define a timeout, after which Zope close a connection if there is no activity between Zope and Postgres? and reestablish connection when application ask for SQL data? With ZTemplates and CGI all these questions has one easy (but not so nice) answer - there is no constant connection, a connection established on every CGI invocation. PS. BTW, I wrote short introduction to Zope in Russian: http://sun.med.ru/~phd/Russian/Zope/ Any Russian here to verify my understanding of Zope? Oleg. ---- Oleg Broytmann National Research Surgery Centre http://sun.med.ru/~phd/ Programmers don't die, they just GOSUB without RETURN.

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AW: [Zope] one 'document' in many 'folders'
by Stefan Franke 23 Mar '99

23 Mar '99

Correct me if I'm wrong, but the only way I see to do this *inside* the Zope application is to keep all your articles inside one folder (pool) and have key documents in your tree structure which reference an article in the pool. I don't know if problems appear when you establish an acyclic directed graph structure in the object hierarchy itself (I asked the question myself months ago without an answer). I see no point why it shouldn't work, but it is not maintained by the application. An interesting fact is that your object's properties vary when accessed by different paths due to the acquisition structure. An object inside Zope's database (again, correct me, if...) doesn't know about its father. It only knows about its sons, the aq_parent path is constructed on each access. Would also like to hear more about this... Stefan > -----Ursprüngliche Nachricht----- > Von: Wade Leftwich [SMTP:wade@lightlink.com] > Gesendet am: Montag, 22. März 1999 13:44 > An: zope(a)zope.org > Betreff: [Zope] one 'document' in many 'folders' > > As a demonstration project to try and get a client to go with Zope, > I'm converting a newsfeed database that I had originally built using > Perl. > > The object of the game is to pull fresh articles from a Reuters > server every two hours and put them in a bin. A human editor goes > through the bin, culls and sorts the articles, edits where > appropriate. > > One article may appear in more than one section of the site. For > example, an article titled "Zope Is Cool" might appear in the > Python, Web Development, and Open Source sections. Each > section has its own contents page. > > This is where I get confused. My Perl application simply used the > filesystem as a database, and generated three separate static > copies of "Zope Is Cool", placing one in each of three directories: > /python, /web_development, and /open_source. I suspect there are > much better ways to do it in Zope, but how do I organize things? > > My naive idea is to make each article a Document, one of whose > properties is a list (or dictionary) of categories in which it should > be > placed. Generating each section's contents page would then take > some figuring out, and performance on doing the contents page > would be a concern. > > If there's a better way, I'd certainly appreciate hearing about it. > > Signed, > > Confused a/k/a > > > > > > Wade Leftwich > Okay Network Services, Ithaca NY > tel 607-277-1334 fax 607-272-3612 > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://www.zope.org/mailman/listinfo/zope > > (For developer-specific issues, use the companion list, > zope-dev(a)zope.org - http://www.zope.org/mailman/listinfo/zope-dev )

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RE: [Zope] Questions about DocumentTemplate.
by Brian Lloyd 23 Mar '99

23 Mar '99

Hi Mark. I've cc'ed this to the zope list, since others may find this useful. > I want DocTemplate to expose an object model, and it seems > perfect for the task. However, Im having trouble using "." > expressions. > > Code speaks louder than words, so my code is: > ## > class Spam: > def eggs(self): > return "Eggs" > > spam=Spam() > > from DocumentTemplate import * > ss=HTML('Eggs are ') > print ss(spam=spam) > > ss=String('Eggs are %(spam.eggs)s') > print ss(spam=spam) > ## > > What Im hoping to do should be quite obvious - I want to refer to > "spam.eggs" in the DTML. > > With the HTML example, #var expr="spam.eggs()" is the best I can > get. It seems ugly to me, and I feel there must be a better way. The  is a perfectly valid way to do it. Another way would be to use the "with" tag:    Neither is really "more correct" than the other, though the with construct is probably cleaner in situations where you use many services of the object:       > Using the String example, I can't make _anything_ work. > > Any I missing something? Is there something I can do so that > String('Eggs are %(spam.eggs)s') does what I want? Hmm - it appears that the expr support is currently broken for the python string format syntax. We'll take a look at that. You can, however, also use the with construct here too: ss=String('eggs are %(with spam)[ %(eggs)s %(with)]') Just in case you hadn't found them already, the latest DTML manuals are on the zope site at: http://www.zope.org/Documentation/Guides/DTML. They contain some examples that try to demonstrate common DTML idioms. Brian Lloyd brian(a)digicool.com Software Engineer 540.371.6909 Digital Creations http://www.digicool.com

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one 'document' in many 'folders'
by Wade Leftwich 23 Mar '99

23 Mar '99

As a demonstration project to try and get a client to go with Zope, I'm converting a newsfeed database that I had originally built using Perl. The object of the game is to pull fresh articles from a Reuters server every two hours and put them in a bin. A human editor goes through the bin, culls and sorts the articles, edits where appropriate. One article may appear in more than one section of the site. For example, an article titled "Zope Is Cool" might appear in the Python, Web Development, and Open Source sections. Each section has its own contents page. This is where I get confused. My Perl application simply used the filesystem as a database, and generated three separate static copies of "Zope Is Cool", placing one in each of three directories: /python, /web_development, and /open_source. I suspect there are much better ways to do it in Zope, but how do I organize things? My naive idea is to make each article a Document, one of whose properties is a list (or dictionary) of categories in which it should be placed. Generating each section's contents page would then take some figuring out, and performance on doing the contents page would be a concern. If there's a better way, I'd certainly appreciate hearing about it. Signed, Confused a/k/a Wade Leftwich Okay Network Services, Ithaca NY tel 607-277-1334 fax 607-272-3612

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ZOracleDA and long numbers
by TFE MMS JARVIS JOHN 23 Mar '99

23 Mar '99

Hi all! I'm having a problem with running queries containing long numbers. I found in db.py that the data type NUMBER is converted to an integer which overflows in my case. The errors: Error, oci.error: (1455, 'ORA-01455: converting column overflows integer datatype\012') Traceback (innermost last): File /usr/lib/python1.5/ZPublisher/Publish.py, line 877, in publish_module File /usr/lib/python1.5/ZPublisher/Publish.py, line 590, in publish (Info: /queries/wisdom/customer-Line/manage_test) File /usr/lib/python1.5/Shared/DC/ZRDB/DA.py, line 305, in manage_test (Object: CopySource) File /usr/lib/python1.5/Shared/DC/ZRDB/DA.py, line 286, in manage_test (Object: CopySource) File /usr/lib/python1.5/Shared/DC/ZRDB/DA.py, line 390, in __call__ (Object: CopySource) File db.py, line 198, in query File /usr/lib/python1.5/Products/ZOracleDA/DCOracle/ociCurs.py, line 317, in fetchmany File /usr/lib/python1.5/Products/ZOracleDA/DCOracle/ociCurs.py, line 279, in fetchone File /usr/lib/python1.5/Products/ZOracleDA/DCOracle/ociCurs.py, line 75, in _error oci.error: (see above) I tried changing line 219 in query() in db.py: from if scale==0: type='i' to if scale==0: type='f' in order to force a float type, but this has no effect, it seems. I'm sure that I'm misunderstanding something here. Any pointers to where I can look to fix this would be greatly appreciated. TIA, John Jarvis Tokyo Electron FE, Ltd.

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Re: Calendar tag
by Mark Interrante 23 Mar '99

23 Mar '99

Again thanks for the Calendar tag. I just ran across a php3 application that might influence you/others. It is http://screwdriver.net/twig/ The demo show you a live application and is quite cool Mark <36f6d7a3.819ed7e-(a)mtear.com> wrote: Original Article: http://www.egroups.com/list/zope/?start=3428 > Ty: > > Again, the usefullness of your code is only outweighed by your > generousity. > I'm trying to get a personal schedular for my people, and I didn't want > to go outside of Zope(since they are using that for thier everyday > needs). And here you are with your Calendar tag. Thanks! > > Oh, I am reading your source to gleen how to implement the persistance > of appointments, any hints? > > Jason Spisak > webmaster(a)mtear.com > > > Message: 1 > From: tsarna(a)endicor.com (Ty Sarna) > Subject: [Zope] Calendar tag released > Date: 21 Mar 1999 21:17:56 GMT > Organization: Endicor Technologies, Inc., San Antonio, Texas > To: zope(a)zope.org > > People have been asking for my Calendar tag product, so I've uploaded a > beta version to the contributed software page. With the DateTime class > fixed in zope 1.10.x, it should be stable (in 1.9, misccalculations > sometimes cause botches like repeated days). > > Have fun, and let me know what you think. When I get a chance I'll > probably add a Year mode and polish up the documentation and call it > 1.0. > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://www.zope.org/mailman/listinfo/zope > > (For developer-specific issues, use the companion list, > zope-dev(a)zope.org - http://www.zope.org/mailman/listinfo/zope-dev )

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RE: Install Zope on Web Host?
by Michel Pelletier 23 Mar '99

23 Mar '99

> -----Original Message----- > From: Jeff Rawlins [mailto:penweb@olypen.com] > Sent: Tuesday, March 23, 1999 8:08 AM > To: support(a)digicool.com > Subject: Install Zope on Web Host? > > > I can't seem to find on your site whether Zope can be > installed on a web > hosting acct. or must be installed directly on your own server. > Thanks, > Jeff Rawlins > Jeff, I have cc'ed your question to the list, not to defer it, but to let you pick the brains of several people who have tried, some successful, some not, to run zope as a user in a web hosting environment. None of us here have tried it so we're not really the ones to ask. It is true there is no documentation on Zope with web hosting, perhaps your discussion will provide information for the Zope Documentation Project, AKA the Martijn Conspiracy. As I understand it, the web hosting provider you pick is key to the whole issue. If they run the kind of environment that works with Zope, great. If they don't (and most probably don't by default) you must communicate to them clearly what you want. If they are cooperative and cool, they will oblige you and join our Zope hosting family. If you can't get ahold of them and/or they don't care, your out of luck unless you go with a Zope friendly provider of which there are two to be found here.: http://www.zope.org/Community/ZHP -Michel

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RE: [Zope] Newbie install help needed !!!!!
by Paul Everitt 23 Mar '99

23 Mar '99

Thomas wrote: > Thus far my attempts to install the Zope binary release on a Linux > machine have been for nothing. The Install documentation and > the Install > program contradict each other at almost every turn. We'll look at overhauling the install documentation for the next release. In the meantime, could you provide more examples of how it can be improved beyond the -u confusion? --Paul

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