June 2000 - Zope - Zope lists

Re: [Zope] Stupid question of the day
by Dieter Maurer 26 Jun '00

26 Jun '00

Andy McKay writes: > How do I find the size of the results returned by the catalog? <dtml-let results=Catalog(....)> <dtml-var "_.len(results)"> <-- the results' length --> </dtml-let> Dieter

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HappySession-0.1.1 available
by Hung Jung Lu 26 Jun '00

26 Jun '00

This release fixes a problem with erasing cookie of expired sessions on the Linux platform. Thanks to Felipe Alvarez for pointing out the problem to me. HappySession is an easy-to-use RAM-based session management product. It can be found at: http://www.zope.org/Members/hungjunglu/Products/HappySession</a> ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com

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Re: [Zope] parsing strings in DTML
by Rik Hoekstra 26 Jun '00

26 Jun '00

> >I'm working on what should be a simple problem. > >I pulling an address out of an ldap query and the data is in the form of a >$-separated string. Example: > >101 Main St.$Anytown$MN$12345 > >Please correct me if I'm wrong, but I could probably do <dtml-call >"REQUEST.set('parsed_address', _.string.join(old_address, '$')"> except for >the fact that getting "old_address" (the $-separated one) would require its >own <dtml-var old_address> statement. I can't nest <dtml>s so how to I >combine these? I'm not sure I get you right. try something like (untested): <dtml-call "REQUEST.set('parse_address', _string.split(old_address, '$')"> for parsing the string > >Second question... Once I've got my string parsed into a list called >"parsed_string", what's the syntax for accessing certain elements of the >list? By slicing: <dtml-call "parsed_string[0]"> gets you the first element parsed_string[1] the second etc parsed_string[1:] is everything after the second ;-) element of the list parsed_string[:5] is everything up to element 6 parsed_string[1:5] is everything from element 2 to element 6 parsed_string[-1] is the last element of the list. If you want to know more, you should probably look at the Python docs, as this is Python stuff. > >P.S. Maybe I should do this in an external or python method, but I thought >it would be overkill for a single operation like this. Am I wrong? No, I think you're right, but others may disagree. hth Rik

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Proxying/Sharing internet for Windows 95
by Hung Jung Lu 26 Jun '00

26 Jun '00

Hi, This is kind of off topic. :) Windows 98 allows users to share one single internet dial-up connection. For Windows 95, you can't do that without buying some software. (I am talking about low-end home network.) It's not too expensive, typically $30 to $50 dollars. But, just for the fun of it, I guess someone might have written a proxy server for Windows 95, already. Is there anything in Python or Zope that does something like that? :) regards, Hung Jung ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com

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Zope 2.2.0 beta 3 released...
by Brian Lloyd 26 Jun '00

26 Jun '00

Hi all, Zope 2.2.0 beta 3 has been released - you can download it from Zope.org: http://www.zope.org/Products/Zope/2.2.0b3/ This release resolves the "len of unsized object" error some folks were seeing with their SQL methods as well as an issue with broken installed products causing a recursion problem instead of appearing as normal "broken" objects. I'm hopeful that this will be the last 2.2 beta, assuming that no other real problems arise that need fixes tested before final. For more information, see the CHANGES.txt file for the release: http://www.zope.org/Products/Zope/2.2.0b3/CHANGES.txt If you are still using a 2.1.x version of Zope, be sure to see the document upgrading to Zope 2.2: http://www.zope.org/Products/Zope/2.2.0b3/upgrading_to_220 for information on the recent changes to the Zope security model and other upgrade information. Brian Lloyd brian(a)digicool.com Software Engineer 540.371.6909 Digital Creations http://www.digicool.com

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Cache X MySQL
by Rogerio Atem de Carvalho 26 Jun '00

26 Jun '00

Dear coleagues, I decided to use Zope as an Interface to maintain and search a touristic information database. All text is stored in MySQL tables and images will be stored outside the database, for cache reasons (I will keep only the path as TEXT columns in MySQL tables). My question is: for me to have an efficient cache system, Am I supposed to store the images as Zope Image Objects or can I store them outside Zope, in normal (Linux) folders? If I store them poutside Zope, is Zope able to cache them??? regrads, Rogerio Atem ------------------------------------------- E-mail enviado pelo servidor do CEFETCampos

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CASE tools and Zope
by Alexander Chelnokov 26 Jun '00

26 Jun '00

Hello All, A newbie question. Is there any hints and tricks how to establish connection between CASE like ERwin and Zope? We plan to develop a a medical record system based on SQL database so data scheme is essential. And all business rules will be held in Zope. SQL tables as I realize should be mapped to ZClasses - if there is an entity "Patient Personal Data" with columns Name, Gender, Date_of_birth, Street_address and so on, then ZClasses with appropriate properties are to be created. At the moment ER model can only be viewed and no more while working in Zope. Is it the only use of data modelling tools for Zope development? Or there is some other techniques of such application development one should be aware of? THX in advance. Best regards, Alexander N. Chelnokov Ural Scientific Institute of Traumatology and Orthopaedics 7, Bankovsky str. Ekaterinburg 620014 Russia ICQ: 25640913

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parsing strings in DTML
by Timothy Wilson 26 Jun '00

26 Jun '00

Hi everyone, I'm working on what should be a simple problem. I pulling an address out of an ldap query and the data is in the form of a $-separated string. Example: 101 Main St.$Anytown$MN$12345 Please correct me if I'm wrong, but I could probably do <dtml-call "REQUEST.set('parsed_address', _.string.join(old_address, '$')"> except for the fact that getting "old_address" (the $-separated one) would require its own <dtml-var old_address> statement. I can't nest <dtml>s so how to I combine these? Second question... Once I've got my string parsed into a list called "parsed_string", what's the syntax for accessing certain elements of the list? Thanks. -Tim P.S. Maybe I should do this in an external or python method, but I thought it would be overkill for a single operation like this. Am I wrong? -- Tim Wilson | Visit Sibley online: | Check out: Henry Sibley HS | http://www.isd197.k12.mn.us/ | http://www.zope.org/ W. St. Paul, MN | | http://slashdot.org/ wilson(a)visi.com | <dtml-var pithy_quote> | http://linux.com/

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Re: [Zope] Products vs. ZClasses- Design Question
by Maik Roeder 26 Jun '00

26 Jun '00

Hi Jimmie ! Jimmie Houchin wrote: > > This sounds weird ! Well, every page on the ZDP site has a Maintainer, > > and that is displayed on the top right. If you click on that link, > > you get to the member page, where the email exists. > > I go back again to make sure of what I saw. In the upper right side, all > that is there is 'Contributed by maik'. It is not a link. It goes > neither to a member page of the maintainer nor provides a mailto: link. > This is in Win95 Netscape. When I view the source I didn't anything > there but text in a table. This is a bug specific to the Portal, which has a folder called members, and unfortunately, I am using just this name in the DTML script that fetches the information out of the members folder that holds the actual member information. <dtml-with members> <dtml-if "The_Maintainer in objectIds(['Member'])"> Maintainer: <A HREF="/members/<dtml-var The_Maintainer>/"> <dtml-var The_Maintainer></A> <dtml-else> Contributed by <dtml-var The_Maintainer> </dtml-if> </dtml-with> I have changed the portal name to zdpmembers, and now it works again. > > You also have to see that the topics in the ZDP-Portal > > are normally not related in a way like an article is, > > so I have not added a navigation, even though I had considered it. > > I don't think it is a problem for unrelated content or articles. It also > doesn't necessarily have to be site wide thing. In this particular > instance all three were related to each other and referenced each other > via the pros and cons. In this case I will have to make explicit links to the related content, like you propose. It is worth the extra effort. > If you think date is not a good indicator of currency, then howabout > having Zope versions with which it is accurate for ? The date will play a role when the changes history of documents is implemented. > ie: Works with Zope > 2.x or Zope 2.2.x, etc. or even a range 2.0-2.1.x. This would allow for > changes in Zope which break certain things. For example any information > on the security model changes between 2.1.x and 2.2.x. > Doing it this way makes it less date dependent. It also allows for > people who are using older versions of Zope to understand if it is > relevant for them. In my opinion, things like that should be noted in the text, or in the changes history (Something like "adopted to Zope 2.2 security model on 22nd of July 2000). > > I have noticed that product as well, but didn't find the > > time to check it out (There is no info on the product > > page). > > I haven't either. Just thought it seemed relevant to the topic. It is relevant, and the portal is supposed to spare you the time to check out everything on your own. If someone has checked out this product, please add your knowledge to the Portal. > > Maybe you can help by adding a draft to the relevant topics, > > that can replace the description that exists ? > > Not at this time, sorry. No problem. Thanks for your comments. Best regards, Maik Röder -- Open Source is "about being able to work together with people you've never met, on projects that are in a constant state of flux, on a time schedule that would cause a hummingbird's head to spin." Paul Ferris, http://www.linuxplanet.com/linuxplanet/opinions/1593/1/

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Re: [Zope] ZODB performance: reads to writes
by Dieter Maurer 26 Jun '00

26 Jun '00

Toby Dickenson writes: > ... problems with high frequency writes ... > As I understand it, a BTreeFolder alone (ie without application-level > conflict handling) will not help here. > > Folders have to ensure that all their contained elements have a > different id. The hot-spot is the only way a Folder can achieve this. Because the application specifies the id, all the folder has to do is verify that the id does not yet exist. This may "look" a path from root to leaf. A conflict between two concurrent transactions results only, if either both want to modify the same leaf node or if a tree restructuring becomes necessary. Dieter

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