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BTree listing by type
by Andre Meyer 03 Dec '03

03 Dec '03

Dear Zopistas Here a question wrt. BTrees: When I create a IOBTree object (for example) and add objects of different kinds (classes) to it, how can I retrieve a list of all objects of a certain type? What I want is something similar to objectValues(type) in Folder. Does that exist for BTrees or do I need to use ZCatalog? How would that work? thanks a lot Andre

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Re: [Zope] REQUEST.set question
by Small Business Services 03 Dec '03

03 Dec '03

RE: [Zope] REQUEST.set questionI don't think that acquisition works like that. I think that you have to pass something to the python script, such as: <dmtl-var "hello(REQUEST)"> or <dtml-var "hello(REQUEST['nome'])"> Jonathan ----- Original Message ----- From: Ferguson, Mark To: 'Small Business Services' Sent: December 3, 2003 9:36 AM Subject: RE: [Zope] REQUEST.set question Yes, that will work but it isn't getting the parameter from the REQUEST object, which is the behaviour I was trying (and failing) to implement...i.e. if the parameter is not passed in the call, Zope is supposed to look for a match in the REQUEST object and use that but, for me, that's not happening. -----Original Message----- From: Small Business Services [mailto:toolkit@magma.ca] Sent: 03 December 2003 14:31 To: Ferguson, Mark Subject: Re: [Zope] REQUEST.set question Sorry, I read your original message too quickly. Try the following call to your python script: <dtml-var "hello('John')"> This should work. Jonathan ----- Original Message ----- From: Ferguson, Mark To: 'Small Business Services' Sent: December 3, 2003 9:21 AM Subject: RE: [Zope] REQUEST.set question Thanks for the input. I was really wondering why the Python script version didn't work. FYI your DTML didn't work as expected either when using 'name'. I changed it to 'nome' and I worked. I think there is a clash in the namespace with 'name'. Unfortunatly it didn't fix the Python version. ho hum... -----Original Message----- From: Small Business Services [mailto:toolkit@magma.ca] Sent: 03 December 2003 14:04 To: Mark Ferguson Subject: Re: [Zope] REQUEST.set question Mark wrote: > I'm going through the code examples in the Zope Bible and I can't get the > following to > work: > > I've created a Python(Script) called 'hello' with 'name' on the parameter > list and the following script body - > return "Hello %s!" % name > > and a DTML Document with - > <dtml-call "REQUEST.set('name', 'John')"> > <dtml-var hello> > > when I view the document I get > Error Type: TypeError > Error Value: hello() takes exactly 1 argument (0 given) The REQUEST.set command creates a variable within the REQUEST namespace called 'name' (in your example) and places 'John' as the contents of that variable. To print out the contents of that variable: <p> this is html Hello <dtml-var name><br> </p> HTH Jonathan ******************************************************************************** This electronic mail system is used for information purposes and is not intended to form any legal contract or binding agreement. The content is confidential and may be legally privileged. Access by anyone other than the addressee(s) is unauthorised and any disclosure, copying, distribution or any other action taken in reliance on it is prohibited and maybe unlawful All incoming and outgoing e-mail communications and attachments are scanned automatically by software designed to detect and remove any material containing viruses or other unauthorised content. While we undertake best endeavours to ensure that this content checking software is up to date, recipients should take steps to assure themselves that e-mails received are secure. *************************************************************************************** ******************************************************************************** This electronic mail system is used for information purposes and is not intended to form any legal contract or binding agreement. The content is confidential and may be legally privileged. Access by anyone other than the addressee(s) is unauthorised and any disclosure, copying, distribution or any other action taken in reliance on it is prohibited and maybe unlawful All incoming and outgoing e-mail communications and attachments are scanned automatically by software designed to detect and remove any material containing viruses or other unauthorised content. While we undertake best endeavours to ensure that this content checking software is up to date, recipients should take steps to assure themselves that e-mails received are secure. ***************************************************************************************

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Re: [Zope] setting Zclass instance id based on properties
by Small Business Services 03 Dec '03

03 Dec '03

Re: [Zope] setting Zclass instance id based on propertmanage_rename can be found in OFS/CopySupport.py Jonathan PS please make sure your posts are sent to the group ----- Original Message ----- From: Charlie Kalech To: Small Business Services Sent: December 3, 2003 8:17 AM Subject: Re: [Zope] setting Zclass instance id based on properties Thanks Jonahan - I'll give it a shot - any idea where in the source I would look? Charlie Charlie wrote: I'm trying to create a context-based id based on the properties. There must be a way to customize the python constructor such that instead of two steps there is a third step that reassigns the value of the id based on properties *after* they are assigned. I'm a designer, not a programmer - can somebody help me out here? I'm looking for someone to fill in the third blank: (1) Add a new instance of the ZClass request = context.REQUEST instance = container.MyZClass.createInObjectManager(request['id'], request) (2) update a property sheet from the form values instance.propertysheets.MyZClassProperties.manage_editProperties(request) (3) set id to be equal several properties (such as section-chapter-book) There is a manage_rename routine. I have never used it myself (other than indirectly by clicking on the 'Rename' button on the ZMI display) so I don't know the parameters required. I would guess it would be something like: <dtml-call "manage_rename(old_id, new_id)"> or <dtml-call "old_id.manage_rename(new_id)"> or <dtml-call "old_id.manage_rename(id=new_id) If these don't work, try looking at the source or maybe someone else on the mailing list has some experience with it. HTH Jonathan Jonathan -- Charlie Kalech Director, J-Town Productions Ltd. _________________________________ Designing Web Sites Since 1994 _________________________________ E-Mail: mailto:Charlie@J-Town.co.il URL: http://www.j-town.co.il POB 10243 Jerusalem 91102 ISRAEL Tel: 972-2-671 9918 Fax: 972-2-672 1245

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setting Zclass instance id based on properties
by Charlie Kalech 03 Dec '03

03 Dec '03

I would like to set the id of a Zclass instance based on some of the properties I can not use the property variables in the add method since the properties have not yet been assigned a value For instance let's say I have three properties: Section, Chapter and Page How do I assign the id the value <dtml-var Section>-<dtml-var Chapter>-<dtml-var Page> when I create the zclass instance?

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Running Zope of CD
by Ulla Theiss 03 Dec '03

03 Dec '03

Hello list, I've read an instruction how to run Zope of a CD (http://www.zope.org/Members/jens/docs/zope_on_cdrom) I want to use this procedure to make some contents of my Zope-Site offline available. It works fine. My problem is, that it seems to require TCP/IP up and running and that is not on all the systems available, where the CD should run. Is there a possiblity, to run Zope of CD and (locally) use it without a network and TCP/IP (on Windows 2000)? Many thanks in advance, Ulla.

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ActivePak and Hotfix needed in 2.6.2?
by Kirk Lowery 03 Dec '03

03 Dec '03

I am moving my zope/cmf/plone (2.6.2/1.3.2/1.0.5) installation to new hardware. The old server had ActivePak 0.1 and Hotfix_2002-6-14 installed automatically during the typical (Debian) upgrade process. On the new server I installed a fresh zope from the Debian "sarge" installation disks. The new server has zope 2.6.2, cmf 1.3.3 and plone 1.0.5, but the ActivePak and Hotfix were not required (apparently) by the Debian packages. I then installed all the Products that the old server had. When I moved the Data.fs file over to the new server, ActivePak 0.1 and a Hotfix_2002-06-14 appear in the installed Products list and they are apparently not broken. Are these still necessary? Or can I just delete them? TIA! Kirk

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Problem with Plone URL
by Chy Ty 03 Dec '03

03 Dec '03

I have userd Plone for content management for my company. Every time I request some thing the URL automatic incluse the Work Plone. http://mywwebsiet.com/Plone/Plone/Plone/Plone/Plone/Plone/Plone/Plone Could you show me how to sold this problem? How can I change the word Plone to another work?

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Rv: Re: [Zope] How to replace catalogaware base class with catalogpathaware in a Zclass?
by Yurj 03 Dec '03

03 Dec '03

--------- Messaggio Originale -------- Da: Dieter Maurer <dieter(a)handshake.de> Per: Yurj <yurj(a)alfa.it> Cc: zope(a)zope.org Oggetto: Re: [Zope] How to replace catalogaware base class with catalogpathaware in a Zclass? Data: 01/12/03 18:28 > > Yurj wrote at 2003-11-30 19:09 -0100: > > How to replace catalogaware base class with catalogpathaware in a Zclass? > > > > Calogaware has path problem with virtual host monster... > > I would reimplement "CatalogAware" by "CatalogPathAware" > (after that, both were the same). How? :)) A new product or editing the source? > I do not know why this has not been done in the first place -- > maybe some backward compatibility issue. Zclass? :)) I don't understand why ZClass has been promoted so much in the Zope Book while they're not supported much by the comunity :P > > There is a quite difficult alternative: rebasing your ZClass. > You should find a HowTo on Zope.org. Black magic for me =) > -- > Dieter > > > > ________________________________________________ Message sent using ALFANET Caorle WEBMAIL 1.0

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Managing a pool of database connections
by David Mitchell 03 Dec '03

03 Dec '03

Hello list, I have a bunch of Postgres databases, containing archived data. The number of databases is growing over time, and already numbers several thousand. I want to give my Zope users the ability to do the following: - specify a database to connect to - select from a list of "lookup" values for certain fields in that database - search the database for data based on the entered "lookup" values - display the results The only part I'm having trouble with is the first step. I don't want to pre-define thousands of database connections, and have to continually add new connections - most of the databases will only be accessed rarely, so creating all those database definitions would constitute a significant time and resource drain. What I'd like to do is: - user enters a database name - a new Zope database connection gets created programmatically, pointing to the requested database (how do I do this???) - using this database connection, we look for data in several tables and present the results as "lookup" values - user searches for data - results displayed - user disconnects, times out or logs out - database connection gets closed Is it possible to create and destroy database connections in Zope like this, and if so, what's the best way to go about it? Regards Dave Mitchell

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The Uncertainty Principle Is Untenable
by Bob 03 Dec '03

03 Dec '03

please reply to hdgbyi(a)public.guangzhou.gd.cn thank you. THE UNCERTAINTY PRINCIPLE IS UNTENABLE By re-analysing Heisenberg's Gamma-Ray Microscope experiment and the ideal experiment from which the uncertainty principle is derived, it is actually found that the uncertainty principle can not be obtained from them. It is therefore found to be untenable. Key words: uncertainty principle; Heisenberg's Gamma-Ray Microscope Experiment; ideal experiment Ideal Experiment 1 Heisenberg's Gamma-Ray Microscope Experiment A free electron sits directly beneath the center of the microscope's lens (please see AIP page http://www.aip.org/history/heisenberg/p08b.htm or diagram below) . The circular lens forms a cone of angle 2A from the electron. The electron is then illuminated from the left by gamma rays--high energy light which has the shortest wavelength. These yield the highest resolution, for according to a principle of wave optics, the microscope can resolve (that is, "see" or distinguish) objects to a size of dx, which is related to and to the wavelength L of the gamma ray, by the expression: dx = L/(2sinA) (1) However, in quantum mechanics, where a light wave can act like a particle, a gamma ray striking an electron gives it a kick. At the moment the light is diffracted by the electron into the microscope lens, the electron is thrust to the right. To be observed by the microscope, the gamma ray must be scattered into any angle within the cone of angle 2A. In quantum mechanics, the gamma ray carries momentum as if it were a particle. The total momentum p is related to the wavelength by the formula, p = h / L, where h is Planck's constant. (2) In the extreme case of diffraction of the gamma ray to the right edge of the lens, the total momentum would be the sum of the electron's momentum P'x in the x direction and the gamma ray's momentum in the x direction: P' x + (h sinA) / L', where L' is the wavelength of the deflected gamma ray. In the other extreme, the observed gamma ray recoils backward, just hitting the left edge of the lens. In this case, the total momentum in the x direction is: P''x - (h sinA) / L''. The final x momentum in each case must equal the initial x momentum, since momentum is conserved. Therefore, the final x momenta are equal to each other: P'x + (h sinA) / L' = P''x - (h sinA) / L'' (3) If A is small, then the wavelengths are approximately the same, L' ~ L" ~ L. So we have P''x - P'x = dPx ~ 2h sinA / L (4) Since dx = L/(2 sinA), we obtain a reciprocal relationship between the minimum uncertainty in the measured position, dx, of the electron along the x axis and the uncertainty in its momentum, dPx, in the x direction: dPx ~ h / dx or dPx dx ~ h. (5) For more than minimum uncertainty, the "greater than" sign may added. Except for the factor of 4pi and an equal sign, this is Heisenberg's uncertainty relation for the simultaneous measurement of the position and momentum of an object. Re-analysis To be seen by the microscope, the gamma ray must be scattered into any angle within the cone of angle 2A. The microscope can resolve (that is, "see" or distinguish) objects to a size of dx, which is related to and to the wavelength L of the gamma ray, by the expression: dx = L/(2sinA) (1) This is the resolving limit of the microscope and it is the uncertain quantity of the object's position. The microscope can not see the object whose size is smaller than its resolving limit, dx. Therefore, to be seen by the microscope, the size of the electron must be larger than or equal to the resolving limit. But if the size of the electron is larger than or equal to the resolving limit dx, the electron will not be in the range dx. Therefore, dx can not be deemed to be the uncertain quantity of the electron's position which can be seen by the microscope, but deemed to be the uncertain quantity of the electron's position which can not be seen by the microscope. To repeat, dx is uncertainty in the electron's position which can not be seen by the microscope. To be seen by the microscope, the gamma ray must be scattered into any angle within the cone of angle 2A, so we can measure the momentum of the electron. dPx is the uncertainty in the electron's momentum which can be seen by microscope. What relates to dx is the electron where the size is smaller than the resolving limit. When the electron is in the range dx, it can not be seen by the microscope, so its position is uncertain. What relates to dPx is the electron where the size is larger than or equal to the resolving limit .The electron is not in the range dx, so it can be seen by the microscope and its position is certain. Therefore, the electron which relates to dx and dPx respectively is not the same. What we can see is the electron where the size is larger than or equal to the resolving limit dx and has a certain position, dx = 0. Quantum mechanics does not rely on the size of the object, but on Heisenberg's Gamma-Ray Microscope experiment. The use of the microscope must relate to the size of the object. The size of the object which can be seen by the microscope must be larger than or equal to the resolving limit dx of the microscope, thus the uncertain quantity of the electron's position does not exist. The gamma ray which is diffracted by the electron can be scattered into any angle within the cone of angle 2A, where we can measure the momentum of the electron. What we can see is the electron which has a certain position, dx = 0, so that in no other position can we measure the momentum of the electron. In Quantum mechanics, the momentum of the electron can be measured accurately when we measure the momentum of the electron only, therefore, we have gained dPx = 0. And, dPx dx =0. (6) Every physical principle is based on an Ideal Experiment, not based on MATHEMATICS, including heisenberg uncertainty principle. For example, the Law of Conservation of Momentum is based on the collision of two stretch ball in the vacuum; the Principle of equivalence(general relativity) is besed on the Einstein's laboratory in the lift. Heisenberg's Gamma-Ray Microscope experiment is an ideal experiment. Einstein said, One Experiment is enough to negate a physical principle. Heisenberg's Gamma-Ray Microscope experiment has negated the uncertainty principle. Ideal experiment 2 Single Slit Diffraction Experiment Suppose a particle moves in the Y direction originally and then passes a slit with width dx(Please see diagram below) . The uncertain quantity of the particle's position in the X direction is dx, and interference occurs at the back slit . According to Wave Optics , the angle where No.1 min of interference pattern is can be calculated by following formula: sinA=L/2dx (1) and L=h/p where h is Planck's constant. (2) So the uncertainty principle can be obtained dPx dx ~ h (5) Re-analysis According to Newton first law , if an external force in the X direction does not affect the particle, it will move in a uniform straight line, ( Motion State or Static State) , and the motion in the Y direction is unchanged .Therefore , we can learn its position in the slit from its starting point. The particle can have a certain position in the slit and the uncertain quantity of the position is dx =0. According to Newton first law , if the external force at the X direction does not affect particle, and the original motion in the Y direction is not changed , the momentum of the particle int the X direction will be Px=0 and the uncertain quantity of the momentum will be dPx =0. This gives: dPx dx =0. (6) No experiment negates NEWTON FIRST LAW. Whether in quantum mechanics or classical mechanics, it applies to the microcosmic world and is of the form of the Energy-Momentum conservation laws. If an external force does not affect the particle and it does not remain static or in uniform motion, it has disobeyed the Energy-Momentum conservation laws. Under the above ideal experiment , it is considered that the width of the slit is the uncertain quantity of the particle's position. But there is certainly no reason for us to consider that the particle in the above experiment has an uncertain position, and no reason for us to consider that the slit's width is the uncertain quantity of the particle. Therefore, the uncertainty principle, dPx dx ~ h (5) which is derived from the above experiment is unreasonable. Conclusion >From the above re-analysis , it is realized that the ideal experiment demonstration for the uncertainty principle is untenable. Therefore, the uncertainty principle is untenable. Reference: 1. Max Jammer. (1974) The philosophy of quantum mechanics (John wiley & sons , Inc New York ) Page 65 2. Ibid, Page 67 3. http://www.aip.org/history/heisenberg/p08b.htm Author : BingXin Gong Postal address : P.O.Box A111 YongFa XiaoQu XinHua HuaDu GuangZhou 510800 P.R.China E-mail: hdgbyi(a)public.guangzhou.gd.cn Tel: 86---20---86856616

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