Re: [Zope] Your thoughts about Zope-based database apps
We've implemented an application like this in our intranet, and it's now up and running satisfactory with 1500 users. We use Oracle as back-end. Here are responses from the rest of your questions: 1.- We've using zope only since six months ago. the development period of the application was three months and we can consider him medium-sized (30 tables, 10 imput screens, 15 output screens, interfaces with operating system authentication and services, outputs in PDF, RTF and HTML formats...). We're not particulary smart :). 2.- We use javascript to perform data validation before insert them in the database (although Oracle has its own data validation, we also perform it in the client side in order to reduce database traffic and to offer the user more precise information about the errors) 3.- The implementation of master/detail forms is rather complicated the first time, but possible: We offer initialy three detail rows for the master one and an "Add row" button that refresh the screen with another detail row when pressed (using zope dtml-in statements). In the validation of the form, we know the number of detail rows and the number of form fields of each row, so, by the position of a field in the form, whe can know to wich detail it belongs and can pass it to the proper insert/update sentence. If you understand spanish, I can give you an example dtml method with this behaviour Alonso Rhenals escribió: I'm considering implementing a web-based database application with MySQL as a back-end and a Zope-based front-end. I wonder if you could provide your thoughts on the following questions: 1. Is Zope a good tool to quicky build an efficient effective user interface for a database application? 2. In particular, what would be the best way to implement the inserting and updating of records along with input data validation? (Retrieving data from a database to show on a web page using Zope is straightforward as you know.) 3. In several cases I'd like to implement a main form/subform, where the subform allows the user to enter several items related to only one record in the main form. Since every item might have many fields (say 20) I'd like to present just the most important fields on a table, and allow the user to view/enter/update all the fields for each item in a different web page. Those of you familiar with Microsoft Access know that in Access it is straightforward to implement this main form/subform interface. I wonder what would be the best way of implementing this using Zope? 4. Do you know of any existing Zope-based app similar to this?. Obviously, the back-end doesn't have to be MySQL. 5. Finally, if somebody is interested in further discussing this type of applications, I'll be glad to participate. Just e-mail me to [EMAIL PROTECTED] Thanks in advance for your inputs. Alonso RhenalsMiami, FL, USAPlease reply to: [EMAIL PROTECTED] ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] input type=checkbox name not pushed to zsql method namespace
this is the standard behaviour in a HTML form. To avoid this problem we
include
an line like this:
dtml-if "REQUEST.has_key('CheckBox_name')"
dtml-else
dtml-call "REQUEST.set('CheckBox_name', 'N')"
/dtml-if
in the method that receives the form data.
Hope this help
=?iso-8859-1?Q?Beuserie_Fr=E9d=E9ric_=28stbrice_dsi=29?= escribió:
hi,
it seems to me that the variable name corresponding to a checkbox into a
form is not
pushed to the namespace of the SQL query when it's not checked. if it's
checked, it works
fine. the error reported is related to the argument list entry corresponding
to the name of the checkbox into the zsql method.
thanks a lot.
-
Beuserie Frederic
DSI / Système et Exploitation - 3 Suisses Belgique
Tel: +3269/882485 / Fax: +3269/882491
Email: [EMAIL PROTECTED]
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Re: [Zope] database connection problem (halting Zope)
In this document: http://www.zope.org/Members/petrilli/DARoadmap the behaviour of different database adapters in a multithreaded environment is discussed. We've observered in our Zope instalation that a long query via ZODBCDA halts (this is similar in the Czech Republic and in Spain). Howerver, if we issue the same query via ZOracleDA, the server still responds while the quere is executing (like a multithreaded server should do) Hrasky Petr escribió: thanks again, yes, the python versions I use are compiled for threads, they link against libpthread under linux. I have also found ZmxODBCDA adapter and it does not work for me yet - it shows in Zope as broken product. I also spoke to local Oracle hotline and they said that ODBC access is not thread safe until 8.1.6.1.1 due to some error in OCI libs. Now I am downloading Oracle for Linux and Sybase for Linux and I will try to compile OracleDA and SybaseDA. Thanks a lot all. Regards, Petr -Original Message- From: Dieter Maurer [mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 03, 2000 11:17 PM To: Hrasky Petr Cc: '[EMAIL PROTECTED]' Subject: RE: [Zope] database connection problem (halting Zope) Hrasky Petr writes: thank you for answers. To clarify: I run Zope-2.2.2/Linux2.2.14/MySQL-ZMySQLDA1.1.3nonbin at home and Zope-2.2.2-binary/NT4.0Workstation/ZODBCDA3.1.0b2 (Oracle 8i ODBC, Sybase11.5)at work. Oracle connection at work and MySQL (at home just for testing) run looong queries and halt Zope. I have no such queries for Sybase yet. I will try to recompile python for linux, but I can't do so for WinNT as I have no compiler. Anyway I thought the python distributed with binary release of Zope is threaded, no? If Python is compiled without threads, there is no module "thread". Zope relies on this module. It dies immediately, if it is not there. Thus, you can be sure, your Python has thread support compiled in. So, does anybody know of either binary and threaded Zope driver for Oracle , Sybase etc. or the same ODBC driver? And what is the state of python threading on WinNT paltform? The Python that comes with Zope has thread support compiled in. Maybe, your Python-ODBC connection "forgets" to release Python's interpreter lock. We, once, had such a problem. Accidentally, the DCOracle module had been set up with a standard Python distribution (with threading disabled) rather than the Zope Python. As a consequence, the DCOracle did not call "releaseLock" and "acquireLock" (as they would not be present in a non-threaded Python). And, of course, database operations blocked Zope. Dieter ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev ) ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev ) ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] DCOracle 1.3.2 for Windows NT
I'm not tried it yet, but you can get an VC6 Workspace for DCOracle in this page: http://starship.python.net/crew/arpadk/ Marcin Dzienniak escribió: Hello, I 'm looking for oci driver (DCOracle 1.3.2) to Windows NT platform, I have heard that someone in this community buit DCOracle for NT and I wonder if you can help me. I would be gratefull if you could send me a makefile to this platform or a comliled file (*.pyd). I have Oracle 8i 8.1.6 . Please send me some information for my adress [EMAIL PROTECTED] Thank you for your attention. ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev ) ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] oracle8 and cursors
I can't imagine a problem that can be solved by cursors and not by a query. We have been used PL/SQL (the extension of SQL by Oracle) inside zsql methods like this: DECLARE C_AUX NUMBER; BEGIN INSERT INTO IT_GRUPO_INVESTIGACION ( C_GRUPO, D_GRUPO, S_GRUPO, F_INI_VIG, F_FIN_VIG, C_MACROAREA, L_TIPO_GRUPO, C_PAI, C_CLASIFICACION_PAI ) VALUES ( dtml-sqlvar C_GRUPO type=nb, dtml-sqlvar D_GRUPO type=nb, dtml-sqlvar S_GRUPO type=nb, dtml-sqlvar F_INI_VIG type=nb, dtml-sqlvar F_FIN_VIG type=nb optional, dtml-sqlvar C_MACROAREA type=nb, dtml-sqlvar L_TIPO_GRUPO type=nb, dtml-sqlvar C_PAI type=nb optional, dtml-sqlvar C_CLASIFICACION_PAI type=nb optional ); dtml-if items dtml-in items dtml-if "C_AREA_UNESCO ''" INSERT INTO IT_GRUPO_AREA_UNESCO ( C_AREA_UNESCO, C_GRUPO, F_INI_VIG, F_FIN_VIG ) VALUES ( dtml-sqlvar C_AREA_UNESCO type=nb, dtml-sqlvar C_GRUPO type=nb, dtml-sqlvar F_INI_VIG type=nb, dtml-sqlvar F_FIN_VIG type=nb optional ); /dtml-if /dtml-in /dtml-if dtml-if items2 dtml-in items2 dtml-if "D_GRUPO_TECNICA ''" SELECT NVL(MAX(C_GRUPO_TECNICA)+1,1) INTO C_AUX FROM IT_GRUPO_TECNICA; INSERT INTO IT_GRUPO_TECNICA ( C_GRUPO_TECNICA, D_GRUPO_TECNICA, C_GRUPO, L_PROPIA ) VALUES ( C_AUX, dtml-sqlvar D_GRUPO_TECNICA type=nb, dtml-sqlvar C_GRUPO type=nb, dtml-sqlvar L_PROPIA type=nb optional ); /dtml-if /dtml-in /dtml-if EXCEPTION WHEN OTHERS THEN rollback; raise; END; and it works fine. However, in such ZSQL method there isn't a resultset to obtain (it contains INSERT and UPDATES). I think you can get a resultset by inserting the results of your cursor proccesing into a temp table and finishing your PL/SQL with a query. On the other hand, a cursor is a select statement you define in order to process each row individually; that is, a ZSQL method. You can reproduce the cursor proccessing by defining several ZSQL methods with single SELECT and combining then in a DTML method that does the actual proccessing (whith dtml-in, dtml-let...) Andy Pahne escribió: hi, there, i've been using oracle8 with zope succesfully for a while. now my database programmer came up with a solution for a certain problem, which "we cannot solve with an easy select statement". he told me, that we are gonna have to use db-cursors instead. i must admit that i have heard the therm cursor before, but i am not sure how to use them with zsql-methods. my question is fairly simple: is there any difference in handling cursors with zsql-methods in comparison to handling 'simple' select-statements? can i use dtml-in "..."/dtml-in to iterate over the result sets? I read DCOracle.txt which comes along with DCOracle-Product, but I do not understand it very well. Any recommended readings? Andy Pahne ap@net22 net22 GmbH Bad Meinberger Strasse 1 32760 Detmold Tel.: 05231 - 580 640 ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev ) ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] zodbc performance question
I think Zope creates itself a pool of connections to the database, extending it when he need more performance. In our installation, we see initially seven connection to Oracle (trough ODBC) generated by only one zodbc database conection object Tino Wildenhain escribió: Hi Julio, we tested exactly this approach but run into some deadlock-situations. Since it did not improve performance we now use only one connection-object per database. Regards Tino Wildenhain julio dinis wrote: Hi all, Using zodbc, supose we have the following situation. One zodbc_database_connection and lots of zsql methods. Can we say that creating more zodbc_database_connection(with a system dsn for each one, but all pointing to the same database) and thus distribute the zsql methods avoiding to all use the same zodbc_connection, will increase performance. Dont tell me I have to test it, I will but some thougts here will help. Best regards, Júlio Dinis Silva Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev ) ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev ) ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
