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FYI: TechWeb mentions Zope
by Paul Everitt 26 Aug '99

26 Aug '99

[Thanks to the folks at LWN for the link...] InformationWeek (TechWeb) mentions Zope in an article describing open source application building. "Among application servers, two packages, PHP and ZOPE, are starting to gain a following." --Paul Paul Everitt Digital Creations paul(a)digicool.com 540.371.6909 ----------------------------------------- The Open Source Zope application server http://www.zope.org/

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Re: [Zope] DTML syntax
by Kevin Dangoor 26 Aug '99

26 Aug '99

-----Original Message----- From: Michel Pelletier <michel(a)digicool.com> To: Tim Wilson <wilson(a)chemsun.chem.umn.edu> Cc: Zope Listserv <zope(a)zope.org> Date: Thursday, August 26, 1999 1:17 AM Subject: Re: [Zope] DTML syntax >You're application can be much simpler. Just design a ZClass that >represents the object, whether it be a PDF file with meta data or >whatever, as what you want it to be. A how-to on this will be >forthcoming. In the meantime, I believe the KM news author is working >with ZClasses, perhaps she/he can relate the experience? I'm that KM news guy... This is a good subject for a how-to. My original suggestion was to just use the Catalog Find command, because this is a very easy way to get started. However, it would take more effort to convert those File objects to a CatalogAware ZClass later, so maybe starting out with a ZClass is the way to go. Unless you think that 2.1 or 2.2 will feature CatalogAware File objects. Here is some fodder for the how-to (let me know if any of it is wrong, because I'd love if some of these things were more automatic :) Creating a CatalogAware ZClass With relatively little effort, a ZClass can be set up to automatically add, delete and update itself from a Catalog. This is a very powerful feature because it allows the user to easily search your content and allows you to produce different views of your objects. This document expects a basic knowledge of ZClasses and describes the additional actions necessary to make a fully-CatalogAware ZClass. Constructing the ZClass When creating the ZClass, you need to select CatalogAware as the *first* base class. So, if you are creating a folderish ZClass, you would select CatalogAware first, and then select ObjectManager. Adding Objects to the Catalog Once you have inherited from CatalogAware, new objects will automatically be added to the Catalog. However, it is not uncommon to modify properties from within your ZClass_add method in the section::   You can ad code that modifies the new instance here. For example, if you have a property sheet that you want to update from form values, you can call it here:    If you do modify the properties, you'll need to reindex the object so that the changes show up in the Catalog. Your code would look something like this::   <dtml-call reindex_object>  Changing the Objects If you use a standard propertysheet management screen, your changes do not get automatically propogated to the Catalog. You'll need to create your own editing method which changes the properties and then calls reindex_object. Deleting the Objects You don't need to do anything special to have your objects removed from the Catalog upon deletion. That's It! Any properties that your ZClass instances have will automatically show up in the Catalog, and the Catalog will stay up to date with changes! Kevin

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RE: [Zope] How do I create a cursor on a query in Zope
by Marten Quadland 26 Aug '99

26 Aug '99

I'm having trouble getting simply the first option to work. I'm used to calling sql calls with the -     Instead of: <dtml-in SQL_get_names> </dtml-in> Is there a difference? If I try your meathod, I can't tell if it is working because it will not print anything to screen. If I try your second meathod, I can't even add the SQL Meathod. It doesn't read the varaibles. Lastly, if I try my syntax above it fails every time. Thanks for the help though, Quad -----Original Message----- From: Evan Simpson [mailto:evan@4-am.com] Sent: Tuesday, August 24, 1999 6:57 PM To: Marten Quadland Cc: 'zope(a)zope.org' Subject: Re: [Zope] How do I create a cursor on a query in Zope Ah! Ok, the first approach which pops to mind is this: Suppose SQL_get_names is the first query, and the others are SQL_get_count1, ..., SQL_get_countn. You could then write: <dtml-in SQL_get_names> <dtml-var NAME> <dtml-in SQL_get_count1><dtml-var count></dtml-in><dtml-in SQL_get_count2>...</dtml-in> </dtml-in> Next approach; Suppose queries 1..n differ only in the table name and group field. Define SQL_get_count(table, gfield, NAME) as: select <dtml-var gfield>, count(*) as rcount from <dtml-var table> where <!--#sqltest name=NAME col=name type=string> group by <dtml-var gfield> and write: <dtml-in SQL_get_names> <dtml-var NAME> <dtml-in "('table1', 'field1'), ('table2', 'field2'),..."> <dtml-in "SQL_get_count(table=_['sequence-key'], gfield=_['sequence-item'], NAME=NAME)"><dtml-var rcount></dtml-in> </dtml-in> </dtml-in> Finally, if you want to minimize the number of queries, you could try defining SQL_get_count(table, gfield) as a join query, and use a dictionary and pair of lists to store results. That gets pretty hairy to write in DTML, though. Marten Quadland wrote: > Sorry for the confusion, > > I'm trying to open a cursor on a query say: > > Open a cursor: > select NAME from table > > Where I can read one name at a time and perform an action on that name. For > example: > > select blah, count(*) as table2Count from table2 > where table2.name = NAME > group by blah > > select blah2, count(*) as table3Count from table3 > where table3.name = NAME > group by blah2 > > select blah3, count(*) as table4Count from table3 > where table3.name = NAME > group by blah3 > > Write a row(NAME, table2count, table3count, table4count) > > CLOSE THE CURSOR > > The end result would be something like: > > NAME Count of Visits Count of Purchases Count of Inquiries > Joe 1234 4331 > 5965 > Jane 3766 3534 > 35 > Jeff 3457 6433 > 3653 > Harry 5433 88 > 2854 > Tim 56 2434 > 9865 > . > . > . > > The capitalized NAME is equal to the value of the first response from > Query1.

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Re: [Zope] DTML syntax
by Kevin Dangoor 26 Aug '99

26 Aug '99

-----Original Message----- From: Tim Wilson <wilson(a)chemsun.chem.umn.edu> To: Zope Listserv <zope(a)zope.org> Date: Thursday, August 26, 1999 1:59 AM Subject: Re: [Zope] DTML syntax >On Wed, 25 Aug 1999, Kevin Dangoor wrote: > >> If it works better for you, you can store the PDFs in the same area as other >> related content. If you want to make a central PDF download page, you could >> then set up ZCatalog to index the property "content_type", and do a Find to >> catalog the objects. Then, your download page just needs to search the >> catalog for content_type: application/pdf (or whatever the type is). >> >> It could be as simple as: >> >> <dtml-in "Catalog({'metatype': 'File', 'content_type': 'application/pdf'})"> >> <a href="/<dtml-var "getpath(data_record_id_)">/index.html"><dtml-var >> title></a> >> </dtml-in> > >OK, this is cool. I just read the ZCatalog tutorial. Are you suggesting a >simple search interface at the central download page or simply using >ZCatalog to find the relevant, but scattered, PDF files and then create >some sort of list of them that a user can click on? You can really do it either way. You can present it to the user as a search interface, which might be nice if you have a whole bunch of docs. Or, if you want to present it more as a download directory (a static-looking list, as opposed to a search), you can just use that code above. The code above does dynamically generate the file list, but the user won't be able to tell if it is static or dynamic. The great thing about ZCatalog is that you can arrange your objects in the ZODB in ways that are convenient to you and still be able to present the users with different views that are independent of an object's location. As Michel mentioned, this is exactly how the new Zope.org beta site works. I can put a news item or howto in my Members page, and then it will show up in the central location for those items through the Catalog. Kevin

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RE: [Zope] Persistent method
by Roelof Naudé 26 Aug '99

26 Aug '99

> > Hi > > > > Is it possible to have a persistent method/class/process > running in the ZOPE > > framework? > > Sure. > > > For example an online trading site would have some connectors > > (CORBA or XLMRPC) to an external system to do the trades. > The connectors can > > be a python class. This class will place an order and have > to wait for a > > reply, but since a reply can take too much time, one would have an > > asynchronous call. The class/process still needs to stay > resident so that it > > can act on the reply, e.g. write reply to database/send > mail to users etc. > > Also it could monitor clients portfolios and send e-mail or > some other > > notification when a specific share is above or below a > certain threshold. > > How this was coded would depend on whether it was truly > asynchronous or not. > For things like monitoring potfolios, you may wish to simply > start a Python thread > that makes the external connection and waits for inputs. > This thread would make > connections to the object database as needed to handle > specific events. > If you need the response to the external call to create a web > response, then > you will need to have web requests lock till you get a reply. > This requires > some tricky coding but may avoid the need for a dedicated > thread. You may need > a combination of these approaches. > > If you can test for external events via a select call, you > should be able > to recieve external events via the asyncore main loop used by ZServer. > This would avoid the need for a dedicated thread and probably simplify > event handling a bit. > Thanx. I'm new to ZOPE, just started out...exploring the possibilities. Where would one add threads or persistent processes in the ZOPE framework? Roelof

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Persistent method
by Roelof Naudé 26 Aug '99

26 Aug '99

Hi Is it possible to have a persistent method/class/process running in the ZOPE framework? For example an online trading site would have some connectors (CORBA or XLMRPC) to an external system to do the trades. The connectors can be a python class. This class will place an order and have to wait for a reply, but since a reply can take too much time, one would have an asynchronous call. The class/process still needs to stay resident so that it can act on the reply, e.g. write reply to database/send mail to users etc. Also it could monitor clients portfolios and send e-mail or some other notification when a specific share is above or below a certain threshold. Any suggestions? Regards Roelof Naude

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RE: [Zope] ZClass tutorial?
by Pam Crosby 26 Aug '99

26 Aug '99

Hi Tim, The documentation for ZClasses is located on the original Zope site at: http://www.zope.org/Documentation/Reference/ZClasses Pamela Crosby Technical Writer mailto:pam@digicool.com Digital Creations http://www.digicool.com > -----Original Message----- > From: Tim Wilson [mailto:wilson@chemsun.chem.umn.edu] > Sent: Thursday, August 26, 1999 12:49 AM > To: Zope Listserv > Subject: [Zope] ZClass tutorial? > > > Hi everyone, > > I'm searching for docs on ZClasses. Are there any to be > found? Searches at > the new Zope site don't come up with anything. > > Specifically, I'm wondering if a ZClass would be of use in my > situation. > I'd like to create a form where the teachers in the science > dept. would > enter the topics they covered, assignments they gave, etc. for a > particular course on a certain day and in a given period. Then, when > students miss school for any number of perfectly good reasons > (grumble...), they could go to a different form and view > and/or print the > assignments they missed. > > Would a ZClass fit in here somewhere? My initial thinking was > to use MySQL > to store the assignments, simple SQL queries to get the data, and a > ZCatalog to provide searching capability. (Wait a > minute...will ZCatalog > catalog an external DB?) I don't know enough about ZClasses > yet to know > where to use them. > > -Tim > > -- > Timothy Wilson | "The faster you | Check out: > Henry Sibley H.S. | go, the shorter | http://slashdot.org/ > W. St. Paul, MN, USA | you are." | http://linux.com/ > wilson(a)chem.umn.edu | -Einstein | http://www.mn-linux.org/ > > > _______________________________________________ > 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: Saving Pipe3 object
by Li Dongfeng 26 Aug '99

26 Aug '99

I have solved this problem. Giving an non-persistent attribute a name starting with "_v_" can avoid pickling it. So I used setattr(self, "_v_long_R_Pipe", long_R) and the attribute can be access outside of the defining method. Li Dongfeng wrote: > I'm using ZOPE to develope a statistics server using R(a GPLed > statistical software). For this, I started the R executable with > popen2.Popen in an external method, but I need to exit the method > without shutting down the pipe, so I used > setattr(self, "some_name", the_pipe) to save the Pipe3 object > as an attribute, > and got an error message: Object unpicklable. > > I understand a open pipe cannot be restored from a file, > but can I save the Pipe3 object reference somewhere > in the running ZOPE's name space without pickling? > Then I can use it in other method to control the > running R process. > > This is a general problem if you want to use Zope > to control other long-running processes.

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off-topic: does caching work differently with frames?
by Kevin Dangoor 26 Aug '99

26 Aug '99

Hi, All I'm working on a new site that uses frames for navigation (or, at least for one mode of navigation). I know other people have complained about caching issues on this list before, but I'm not sure if I've seen this before: when I'm using frames, IE5 seems to just put up the cached copies of things. If I go directly to the URL at the top level, I see the new content... but I have to explicitly refresh in the frame in order to get the new content to show up there... Is this consistent with what you've all seen? Is there a way to make this stop? Thanks, Kevin

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manage_clone problem
by Heiko Stoermer 26 Aug '99

26 Aug '99

I have created a DTML Document in the root directory that is supposed to be used from all subdirs of my web application. This document contains a call to manage_clone(), which should copy an object from some other folder into the _current_ folder. But as the DTML is stored in the root directory, manage_clone always clones into the _rootdir_, too. this is the call:  Please help. H. -- Heiko Stoermer MIG Augsburg

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