January 2000 - Zope - Zope lists

RE: [Zope] Zope/Linux/Oracle - Cannot establish DB connection
by Brian Lloyd 04 Jan '00

04 Jan '00

> OK, that looks like it. > > When I stopped ZServer (which was originally started by init > on boot) and > restarted it from a logon (which would have run /etc/profile > where all the > Oracle environment variables were initialised), I was able to connect. > > It looks like I need to set these ORACLE_ environment variables in my > startup scripts. Is it a good idea to do this in > /etc/rc.d/init.d/zope, or > would you recommend doing it somewhere else? Hi Andrew - There are 2 common ways to define environment variables for the Zope process (and they should be better documented in the standard Zope docs - I think they are just mentioned in the READMEs for the various database adapters right now). Starting with Zope 2.x, most folks use the "start" script generated by the Zope installation to crank up Zope - that's the best place to set any environment variables needed by Zope products (such as DB adapters, though other components could conceivably want env. vars as well). The default "start" script should look something like: #! /bin/sh reldir=`dirname $0` PYTHONHOME=`cd $reldir; pwd` export PYTHONHOME exec /usr/local/bin/python1.5.2 -O \ $PYTHONHOME/z2.py \ -D -P 8000 "$@" So if you add the appropriate env. vars to this, a la: #! /bin/sh reldir=`dirname $0` PYTHONHOME=`cd $reldir; pwd` export PYTHONHOME ORACLE_HOME=/foo/bar export ORACLE_HOME ORACLE_SID=whatever_it_is export ORACLE_SID exec /usr/local/bin/python1.5.2 -O \ $PYTHONHOME/z2.py \ -D -P 8000 "$@" Then the Zope process will get them, provided you start Zope with the "start" script (via init.d, manually or some other means). Another way to do it is to put the appropriate variables in your Zope.cgi file, but *this only works if you use PCGI exclusively and PCGI is responsible for starting up your Zope process*. This is mainly a holdover from 1.x, where in most cases pcgi was responsible for starting the process. That is rarely the case now, but I wanted to mention it in case this tidbit is useful to somebody. If (and only if) PCGI starts the process itself, any name=value pairs found in the pcgi resource file (Zope.cgi) that don't relate directly to PCGI are added to the environment at the time that PCGI starts the Zope process. Hope this helps! Brian Lloyd brian(a)digicool.com Software Engineer 540.371.6909 Digital Creations http://www.digicool.com

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Re: [Zope] Storing objects with SQLSession
by Anthony Baxter 04 Jan '00

04 Jan '00

>>> Pavlos Christoforou wrote > As far as I remember SQLSession pickles all cookies so you can store > nearly any arbitrary python object, including instances. FSSession > marshals data which is faster than pickle but it cannot store complex > objects. SQLSession stores base64 encoded pickles of whatever you store in it, yes. Is cpickle that much slower than marshal? I thought they were close in speed? hm - another toggle for the standardised session API, maybe? marshal vs pickle? The other storage type I've thought about is zope style marshalling, eg foo:int = "2", fred:list=["a", "b", "c"] - this would be rather slow (particularly to unpack) but would allow human inspection of the data in it's encoded form. Anthony -- Anthony Baxter <anthony(a)interlink.com.au> It's never too late to have a happy childhood.

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Storing objects with SQLSession
by Nemeth Miklos 04 Jan '00

04 Jan '00

Is there a way to store complex objects in session objects, or SQLSession can store string values? I have not tested so far FSSession, but its announcement states that it is capable of storing lists (I suppose list of strings only). Does SQLSession also support storing list of strings? NM

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Re: [Zope] Storing objects with SQLSession
by Anthony Baxter 04 Jan '00

04 Jan '00

>>> Nemeth Miklos wrote > Is there a way to store complex objects in session objects, > or SQLSession can store string values? > I have not tested so far FSSession, but its announcement states that it > is capable of storing lists (I suppose list of strings only). > Does SQLSession also support storing list of strings? SQLSession can store anything that Python's cPickle can handle. The maximum object size depends on the database, and on how you define the table (the size of the varchar). Anthony -- Anthony Baxter <anthony(a)interlink.com.au> It's never too late to have a happy childhood.

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Connection reset by peer - ZServer problem ?
by chas 04 Jan '00

04 Jan '00

Using just ZServer (not apache/pcgi), I've been getting intermittent "Connection reset by peer" errors. The annoying thing is that sometimes it happens, sometimes it doesn't. But it only occurs when submitting forms. I remember running Netscape webservers a few years back, we would get the same problem (which was solved when I moved to Apache). Is there some way to get ZServer to stop doing this or must I use the Apache/Zope mix instead ? Thank you, chas

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RE: [Zope] assignment problems
by Martijn Pieters 04 Jan '00

04 Jan '00

> > Call does exactly the same as var, only it will ignore any values > > Thanks! I would like to learn more (or everything) about > REQUEST. There > is very sparse information in DTML.2.4.html. For instance i can't find > any documentation about REQUEST.set you just mentioned... See: http://www.zope.org/Documentation/Guides/DTML-HTML/DTML.5.4.html#33612 -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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RE: [Zope] Newbie question: updating properties
by Martijn Pieters 04 Jan '00

04 Jan '00

> I have a property x type int with value 1 > > The following piece of dtml code: > > <dtml-var x>, > <dtml-call "manage_changeProperties(x=2)"> > <dtml-var x>, > <dtml-var "this().getProperty('x')"> > > prints > > 1,1,2 > > I wonder why it doesn't print 1,2,2 > Why is the new property value not reflected in the dtml-var? > > anyone any idea's? Hmm.. IIRC, dtml-var caches retrieved named objects. The first time it actually looks up x, the next invocation on a page it will reuse that value. This only within one call to a page, the next time the page is called, x is retrieved once again.

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RE: [Zope] assignment problems
by Martijn Pieters 04 Jan '00

04 Jan '00

> > However, you can lever the REQUEST object for this kind of thing: > .... > > Now, 'Size' is found in the REQUEST object, and there the value of > > 'Size' can be modified. > > Great! Is this in the docs? I found a very short article > about dtml-call > in DTML.7.html, but there's nothing about REQUEST.set... just a single > example > > <dtml-call "addDocument('hi','display a greeting','Hello world!')"> > > Maybe there are other things I can do with <dtml-call>? Call does exactly the same as var, only it will ignore any values returned by the called expression or name. So <dtml-call standard_html_header> will usually have no effect whatsoever, except for waisting a few cycles, unless standard_html_header has side like manipulating the REQUEST object.

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RE: [Zope] Searching File-objects in a Folder
by Martijn Pieters 04 Jan '00

04 Jan '00

> Hi there, > > For practice I want to implement WikiWiki in Zope. For that, > I for one > thing have to be able to see if a certain File-object exists > in a Folder. > What method can I use for that? I tried several from the ZQR, > but nothing > works. I also have trouble just to get a list of Files in the Folder. > Here's a code-fragment of what I try to do in DTML: <SNIP> Not exactly an answer to your question. Are you aware of ZWiki? It's WikiWiki done in Zope. See: http://www.zope.org/Members/simon/ZWiki

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publishing a group of linked html files
by Chris WRIGHT 04 Jan '00

04 Jan '00

I've got a whole lot of html files (produced by latex2html). I want to publish them with Zope, and I'm not sure of the best way. If I add a File object for every html file (and for the .css files), then I can get the thing published, but the URL's start to look like: www.blah.blah/node1.html/node2.html/node3.html and the "previous" and "next" buttons don't perform properly (Object not found errors). Is there a "well know" (tm) way of publishing a "tree" of html docs by just "pointing" to the top level file. This would also be much more convenient when publishing revisions. (Zope is being used in an Intensive Care Unit to publish the unit policies and procedures. Soon, through the magic of Fnorb and external methods, it will be used to publish data from bedside workstationss and monitoring equipment!) cheers and thanks chris wright

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