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Formulator 1.4.0 released
by Martijn Faassen 15 May '03

15 May '03

Hey everybody, Formulator 1.4.0 has been released. There are a number of new features, including unicode support, new options for DateTime fields and string fields, as well as a system for the public rendering of data based on the form. For Formulator and more information, go here: http://www.zope.org/Members/faassen/Formulator Regards, Martijn

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Upcoming Zope 3 sprints in Fredericksburg
by Jim Fulton 15 May '03

15 May '03

We are going to be hosting two Zope 3 sprints: http://dev.zope.org/Zope3/SprintSchedule at the Zope offices in Fredericksburg, Virginia, May 31-June 2. and June 21-23. These are three-day sprints running Saturday-Monday to make it easier for people with "day jobs" to participate. We might be able to arrange some lodging in folk's homes. I can accomidate two or three people at my place. If you are interested in participating, please let me know. The first sprint is only a couple of weeks away. If you are interested in that one, let me know as soon as you can. Jim -- Jim Fulton mailto:jim@zope.com Python Powered! CTO (703) 361-1714 http://www.python.org Zope Corporation http://www.zope.com http://www.zope.org

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Zope 2.6.2 Beta 1 Released
by Matthew T. Kromer 14 May '03

14 May '03

ZOPE 2.6.2 Beta 1 Released Zope 2.6.2b1 represents a development step in the next Zope release formed with a large number of community contributions. You may download Zope 2.6.2b1 from Zope.org: http://www.zope.org/Products/Zope/2.6.2b1/ Users of the Zope source release should note that Python 2.1.3 is now the required platform. Python 2.1.3 includes a fix to an issue that could cause crashes in Zope. Users who upgrade from source MUST RUN a make clean and make command to build the proper binaries correctly; distutils will skip compilation of the library modules needed for Zope and will cause errors if they are not up to date. Particular features of interest in Zope 2.6.2b1: * Back ports of BTrees fixes * Back ports of ZODB fixes relating to the packing of storage, where a packed database could contain an UNDO transaction which referred to data which had been discarded by the pack * A fix for fsrecover.py which prevented it from recovering any data * Fixes for collector issues 256, 683, 814, 816, 875, 892 For more information on what is new in this release, see the CHANGES.txt and HISTORY.txt files for the release: * http://www.zope.org/Products/Zope/2.6.2b1/CHANGES.txt * http://www.zope.org/Products/Zope/2.6.2b1/HISTORY.txt For more information on the available Zope releases, guidance for selecting the right distribution and installation instructions, please see: http://www.zope.org/Documentation/Misc/InstallingZope.html -- Matt Kromer Zope Corporation http://www.zope.com/

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ANN: eGenix mxODBC Zope Database Adapter, Version 1.0.6
by M.-A. Lemburg 14 May '03

14 May '03

________________________________________________________________________ ANNOUNCEMENT EGENIX.COM mxODBC Zope Database Adapter Version 1.0.6 Available for Zope 2.3 - 2.6 on Windows, Linux and Solaris ________________________________________________________________________ INTRODUCTION The eGenix mxODBC Zope Database Adapter (Zope DA) allows you to easily connect your Zope installation to just about any database backend on the market today, giving you the reliability of the commercially supported eGenix.com product mxODBC and the flexibility of the ODBC standard as middle-tier architecture. Unlike Zope's ZODBC Zope DA, the mxODBC Zope DA works on Windows XP/NT/2000/98/95, Linux and Solaris using the same interface on all platforms. The mxODBC Zope DA implements thread-safe connection pooling and multiple physical connects per logical Zope connection. You can safely run Z SQL Methods in parallel, achieving a much better performance than ZODBC Zope DA or similar Zope database adapters under heavy load. This makes it ideal for deployment in Zope Clusters and Zope hosting environments where stability and high performance are a top priority. ________________________________________________________________________ FEATURES * Zope Level 3 Database Adapter: the mxODBC Zope DA is fully multi-threaded and can handle multiple connections to multiple databases. * Fully compatible to Z SQL Methods. * Drop-in compatible to the ZODBC DA: the mxODBC Zope DA provides the same interfaces as Zope's ZODBC DA to allow a smooth upgrade path from this simplistic adapater to the high performance mxODBC Zope DA. * Fully compatible to the Znolk SQL Wizard Product and other similar products relying on the common database schema access methods .tables() and .columns(). * Connection Pooling: physical database connections are pooled and kept open, to reduce the connection overhead to a minimum. This is especially important for high latency database connections and ones like Oracle which take a considerable amount of time to setup * Parallel Execution of Queries on a single logical connection: the mxODBC Zope DA can manage any number of physical connections on a single logical connection. This enables running truly parallel Z SQL Method queries -- a feature not available in other Zope DAs. * Robust Mode of Operation: connections which have timed out or go away due to network problems are automatically reconnected. * Cross-platform Connection Objects: The Zope DA will automatically choose the right platform specific ODBC manager for you. * Per Connection Adjustable ODBC Interface: mxODBC comes with many different subpackages to choose from on Unix. The Zope DA allows you to select these subpackages on a per-connection basis. * Per Connection Error Handling: you can tell each connection whether it should report ODBC warnings or not; furthermore all warnings and errors are made available as list .messages on the DatabaseConnection object. * Transaction safe automatic reconnect: when the DA finds that a connection has timed out, it automatically tries a reconnect and replays the transaction on the connection (unlike other DAs which break the transaction scheme by doing a reconnect without replay). * Built-in Schema Cache: this results in improved performance under heavy load. * Database Schema Access: all ODBC catalog methods are made available for much better database schema inquiry. The catalog methods allow building generic database interrogation or manipulation tools and facilitates writing database independent Zope products. * Lazy Connect: the mxODBC Zope DA only connects to the database backends when a connection is actually requested. This results in a better use of resources compared to other Zope DAs. ________________________________________________________________________ NEWS Version 1.0.6 includes the following changes and enhancements: * The lazy connect feature was turned into a per-connection option. This gives you more control over which connections are maintained in connect-on-demand state and which are always connected. * A new option was introduced to let the mxODBC Zope DA return the natively used mxDateTime values instead of converting them to Zope's DateTime instances. This is a faster if you're dealing with a lot of date/time values and also provides more flexibility in data access. See the mxDateTime documentation for full details on what this package can offer. * A bug in the version 1.0.5 lazy connect feature was fixed. In short: mxODBC Zope DA is continuing to become the number one solution for integrating relational databases with Zope applications. ________________________________________________________________________ UPGRADING If you have already bought mxODBC Zope DA licenses, you can use these license for the updated version as well. There is no need to buy new licenses. The same is true for evaluation license users. ________________________________________________________________________ MORE INFORMATION For more information on the mxODBC Zope DA, licensing and download instructions, please visit our web-site: http://www.egenix.com/ You can buy mxODBC Zope DA licenses online from the eGenix.com shop at: http://shop.egenix.com/ ________________________________________________________________________ Thank you, -- Marc-Andre Lemburg eGenix.com Professional Python Software directly from the Source (#1, May 14 2003) >>> Python/Zope Products & Consulting ... http://www.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ EuroPython 2003, Charleroi, Belgium: 41 days left

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ZODB 3.1.2 beta 1 released!
by Jeremy Hylton 13 May '03

13 May '03

I'm pleased to announce a beta release of ZODB 3.1.2 and ZEO 2.0.2. The are three major bug fixes in this release: - A new pack() implementation for FileStorage that fixes recently discovered data corruption problems. - Atomic processing of invalidations to guarantee data consistency. - Fix for Missing.Value to prevent segfaults during comparison. This release corresponds exactly to Zope 2.6.2 beta 1, which will be released in the near future. The release is available in the usual place http://www.zope.org/Products/ZODB3.2 It has been tested with Python 2.1.3, 2.2.2, and 2.3b1 on Windows and Linux. Binary installers are available for Windows for 2.1.3 and 2.2.2. I am particularly eager to get feedback on the new pack implementation. It is a substantial rewrite of the garbage collector. It fixes several reported bugs, but I'd like to see substantial user testing to make sure we didn't add too many news ones. I've included the complete news file below. Jeremy What's new in ZODB3 3.1.2 beta 1? ================================= ZODB ---- Invalidations are now processed atomically. Each transaction will see all the changes caused by an earlier transaction or none of them. Before this patch, it was possible for a transaction to see invalid data because it saw only a subset of the invalidations. This is the most likely cause of reported BTrees corruption, where keys were stored in the wrong bucket. When a BTree bucket splits, the bucket and the bucket's parent are both modified. If a transaction sees the invalidation for the bucket but not the parent, the BTree in memory will be internally inconsistent and keys can be put in the wrong bucket. The atomic invalidation fix prevents this problem. A number of minor reference count bugs in the object cache were fixed. That's the cPickleCache.c file. It was possible for a transaction that failed in tpc_finish() to lose the traceback that caused the failure. The transaction code was fixed to report the original error as well as any errors that occur while trying to recover from the original error. ZEO --- A ZEO client will not read from its cache during cache verification. This fix was necessary to prevent the client from reading inconsistent data. The isReadOnly() method of a ZEO client was fixed to return the false when the client is connected to a read-only fallback server. The sync() method of ClientStorage and the pending() method of a zrpc connection now do both input and output. The short_repr() function used to generate log messages was fixed so that it does not blow up creating a repr of very long tuples. Storages -------- FileStorage has a new pack() implementation that fixes several reported problems that could lead to data loss. Two small bugs were fixed in DemoStorage. undoLog() did not handle its arguments correctly and pack() could accidentally delete objects created in versions. Fixed trivial bug in fsrecover that prevented it from working at all. FileStorage will use fsync() on Windows starting with Python 2.2.3. FileStorage's commit version was fixed. It used to stop after the first object, leaving all the other objects in the version. BTrees ------ Trying to store an object of a non-integer type into an IIBTree or OIBTree could leave the bucket in a variety of insane states. For example, trying b[obj] = "I'm a string, not an integer" where b is an OIBTree. This manifested as a refcount leak in the test suite, but could have been much worse (most likely in real life is that a seemingly arbitrary existing key would "go missing"). When deleting the first child of a BTree node with more than one child, a reference to the second child leaked. This could cause the entire bucket chain to leak (not be collected as garbage despite not being referenced anymore). Other minor BTree leak scenarios were also fixed. Other ----- Comparing a Missing.Value object to a C type that provide its own comparison operation could lead to a segfault when the Missing.Value was on the right-hand side of the comparison operator. The Missing class was fixed so that its coercion and comparison operations are safe. Tools ----- Four tools are now installed by setup.py: fsdump.py, fstest.py, repozo.py, and zeopack.py.

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less than two weeks left for Python 11 - OSCON 2003 early bird registration
by Kevin Altis 12 May '03

12 May '03

The deadline for Python 11 - OSCON 2003 early bird registration is May 23rd, 2003. The conference will be held July 7-11, 2003 in Portland, Oregon, USA. http://conferences.oreillynet.com/os2003/ http://conferences.oreillynet.com/pub/w/23/register.html Save up to $400 when you register by May 23rd for the Python 11/OSCON 2003 conference. Additional discounts are available. I'm including the text of the special discounts available for the conference below since they are quite significant; see the URL above for further info and mailto links. All of the discounts listed at the bottom of the registration page are in addition to the early bird discount. The early bird discount is (obviously) time-limited, but the others are not. Special Discounts ================= Early Bird Pricing - Save up to $400 when you register by May 23, 2003. SPECIAL TUTORIAL OFFER - Buy 2 tutorials, get 2 free (when you purchase a full conference pass). Full Time Student - 65% off with proof of status, a copy of ID & class schedule. Fax to 707-829-1342. Please use os03st in discount field. Academic Instructor - 50% off with proof of full time academic instructor status on organization letterhead. Fax to 707-829-1342. Please use os03ac in discount field. Academic Staff - 25% off with proof of full time academic employee status on organization letterhead. Fax to 707-829-1342. Please use os03sa in discount field. Company Team Discount - 10% off per person if you register 3 or more people from one company. Please use os03team in discount field. Proof of status of employment for each attendee must be faxed to 707-829-1342. Federal Government Discount - 20% off with proof of agency connection. Use discount code, os03gov, and fax to 707-829-1342. User Group Members - UG discounts are available. For discount information or to see if your group is eligible please email Marsee Henon for details. To sign your group up with the O'Reilly User Group Program please go to http://ug.oreilly.com/. Alumni - Have you attended one of our O'Reilly conferences? If so, you are eligible for a 30% alumni discount. Please email Linda Holder for verification and your special discount code. ka --- Kevin Altis, Python 11 co-chair altis(a)semi-retired.com http://altis.pycs.net/ http://www.pythoncard.org/

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EuroPython 2003
by Martijn Faassen 12 May '03

12 May '03

CHARLEROI, MAY 12th 2003 - Second Annual European Python and Zope Conference to be held in Charleroi, Belgium on June 25-27, 2003. Announcing: European Python and Zope Conference 2003 Annual event for growing developer community in Europe. Open source leaders to give keynotes European Python and Zope Conference 2003 (EuroPython 2003) June 25-27, 2003 Charleroi, Belgium http://www.europython.org Registration is now open! http://www.europython.org/Registration/register Only once a year do European software developers have the opportunity to learn about Python, the fastest growing, sophisticated open source application development platform. The second annual Europython conference, being held this year in Charleroi, Belgium on June 25-27, 2003, is also an opportunity to meet with fellow developers and exchange ideas and experiences. With keynote speeches that include the creator of Python; a renowned trainer and mentor in the C++ world; as well as major developer activities, the conference promises to be a breakthrough event for open software in Europe. The EuroPython conference is the premiere venue for meeting Python and Zope developers from Europe and beyond. As one of the first community-organized Python and Zope conferences, the EuroPython Conference delivers the atmosphere and information developers want. Hundreds of new and experienced developers attending the conference will see a full program, including: Keynote by Guido van Rossum, creator of Python. He created Python in the early 1990s at CWI in Amsterdam (the National Research Institute for Mathematics and Computer Science in the Netherlands). He is still actively involved in the development of the language. In 1995 he moved to the US where he now works for Zope Corporation as Director of PythonLabs, the core Python development group hosted by the same company. Keynote by Francis Glassborow, a renowned trainer and mentor in the C++ world. Over 8 years as Chairman of the Association of C & C++ Users, he built up a flourishing organisation which hosts a successful conference and associated standards committee meetings, publishes several journals, and has a strong community embracing the authors and leading lights of C++, Java and now Python. The conference program has over 50 presentations and tutorials in 5 tracks, including Python In Business, Python Frameworks, Python Language, Python In Science and Industry, and Zope. The program contains tutorials, presentations, lightning talks, and "birds of a feather" gatherings. Additional events include a PyPy and Zope3 sprint. EuroPython 2003 will be held in Charleroi, Belgium, a city close to Brussels. Space is filling quickly, so early registration at the EuroPython website (http://www.europython.org) is encouraged. Student discounts are available. The EuroPython 2003 conference continues this year's series of open source developer events in Europe, including FOSDEM and Python-UK, which each attracted thousands of attendees. Like these conferences, EuroPython 2003 is organized by a volunteer group of open source developers. About Python Python is a leading object-oriented open source programming language that runs on all modern platforms. By integrating ease-of-use, clarity in coding, enterprise application connectivity and rapid application design, Python is an ideal programming platform for todays IT challenges. More information, including the Python source code and binaries for Linux and Windows, are available at http://www.python.org. About Zope Zope is a leading open source application server, specializing in content management, portals, and custom applications. Since Zope Corporation introduced Zope as an open source product in 1998, it has become the platform of choice for content publishers, managers and application developers. Zope comes with complete source code, most of which is written in Python. More information, including the Zope source code and binaries for Linux and Windows, are available at http://www.zope.org. Python and Zope are maintained and enhanced in open source fashion by an international community of programmers and companies. Contacts Conference Organization EuroPython Conference Team P3B c/o Aragne Boulevard Général Michel 1E B-6000 Charleroi. tel:+32(0)71/270.389 mailto:europython@p3b.org International Contacts Belgium Denis Frère, mailto:denis@aragne.com, tel: +32(0)479.651.442 Tom Deprez, mailto:tom@aragne.com, tel: +32(0)2.479.63.88 France Nicolas Chauvat, mailto:nicolas.chauvat@logilab.fr, tel: +33 (0)1.45.32.03.12 Germany Marc-André Lemburg, mailto:mal@egenix.com, tel: +49(0) 211.9304112 Netherlands Martijn Faassen, mailto:faassen@infrae.com, tel: +31(0) 10.243.7051 United Kingdom ReportLab Europe Ltd, tel: +44-20-8540-9926 Tim Couper, mailto:tim@2wave.net, tel: +44 (0)1582 463120

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ANN: eGenix mxODBC Zope Database Adapter, Version 1.0.5
by M.-A. Lemburg 09 May '03

09 May '03

________________________________________________________________________ ANNOUNCEMENT EGENIX.COM mxODBC Zope Database Adapter Version 1.0.5 Available for Zope 2.3 - 2.6 on Windows, Linux and Solaris ________________________________________________________________________ INTRODUCTION The eGenix mxODBC Zope Database Adapter (Zope DA) allows you to easily connect your Zope installation to just about any database backend on the market today, giving you the reliability of the commercially supported eGenix.com product mxODBC and the flexibility of the ODBC standard as middle-tier architecture. Unlike Zope's ZODBC Zope DA, the mxODBC Zope DA works on Windows XP/NT/2000/98/95, Linux and Solaris using the same interface on all platforms. The mxODBC Zope DA implements thread-safe connection pooling and multiple physical connects per logical Zope connection. You can safely run Z SQL Methods in parallel, achieving a much better performance than ZODBC Zope DA or similar Zope database adapters under heavy load. This makes it ideal for deployment in Zope Clusters and Zope hosting environments where stability and high performance are a top priority. ________________________________________________________________________ FEATURES * Zope Level 3 Database Adapter: the mxODBC Zope DA is fully multi-threaded and can handle multiple connections to multiple databases. * Fully compatible to Z SQL Methods. * Drop-in compatible to the ZODBC DA: the mxODBC Zope DA provides the same interfaces as Zope's ZODBC DA to allow a smooth upgrade path from this simplistic adapater to the high performance mxODBC Zope DA. * Fully compatible to the Znolk SQL Wizard Product and other similar products relying on the common database schema access methods .tables() and .columns(). * Connection Pooling: physical database connections are pooled and kept open, to reduce the connection overhead to a minimum. This is especially important for high latency database connections and ones like Oracle which take a considerable amount of time to setup * Parallel Execution of Queries on a single logical connection: the mxODBC Zope DA can manage any number of physical connections on a single logical connection. This enables running truly parallel Z SQL Method queries -- a feature not available in other Zope DAs. * Robust Mode of Operation: connections which have timed out or go away due to network problems are automatically reconnected. * Cross-platform Connection Objects: The Zope DA will automatically choose the right platform specific ODBC manager for you. * Per Connection Adjustable ODBC Interface: mxODBC comes with many different subpackages to choose from on Unix. The Zope DA allows you to select these subpackages on a per-connection basis. * Per Connection Error Handling: you can tell each connection whether it should report ODBC warnings or not; furthermore all warnings and errors are made available as list .messages on the DatabaseConnection object. * Transaction safe automatic reconnect: when the DA finds that a connection has timed out, it automatically tries a reconnect and replays the transaction on the connection (unlike other DAs which break the transaction scheme by doing a reconnect without replay). * Built-in Schema Cache: this results in improved performance under heavy load. * Database Schema Access: all ODBC catalog methods are made available for much better database schema inquiry. The catalog methods allow building generic database interrogation or manipulation tools and facilitates writing database independent Zope products. * Lazy Connect: the mxODBC Zope DA only connects to the database backends when a connection is actually requested. This results in a better use of resources compared to other Zope DAs. ________________________________________________________________________ NEWS Version 1.0.5 introduces the following new features compared to version 1.0.4: * Support for multi-statement queries. Z SQL Methods allow multiple statements in a single query via the <dtml-var sql_delimiter> feature. mxODBC Zope DA 1.0.5 now supports this feature as well. * Lazy Connect: mxODBC Zope DA 1.0.5 only reconnects mxODBC Connection objects if Zope requests a connection object. This results in better use of available resources. Other Zope DAs tend to always reconnect when loading the connection objects into memory, e.g. when loading the folder containing the connection object, even though the connection is not really used for anything. In short: mxODBC Zope DA is continuing to become the number one solution for integrating relational databases with Zope applications. ________________________________________________________________________ UPGRADING If you have already bought mxODBC Zope DA licenses, you can use these license for the updated version as well. There is no need to buy new licenses. The same is true for evaluation license users. ________________________________________________________________________ MORE INFORMATION For more information on the mxODBC Zope DA, licensing and download instructions, please visit our web-site: http://www.egenix.com/ ________________________________________________________________________ Thank you, -- Marc-Andre Lemburg eGenix.com Professional Python Software directly from the Source (#1, May 09 2003) >>> Python/Zope Products & Consulting ... http://www.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ EuroPython 2003, Charleroi, Belgium: 46 days left

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EuroPython talk submission last chance!
by Martijn Faassen 06 May '03

06 May '03

Hi there, The deadline for talk submissions at EuroPython 2003 has been extended until Monday May 12, 2003. So if you have a presentation about Zope or Python you'd like to give, please submit one before it's too late! Information about submitting a talk: http://www.europython.org/sessions/cft More about EuroPython: http://www.europython.org Regards, Martijn

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RevisionManager 1.2.1 bugfix released
by Philipp von Weitershausen 05 May '03

05 May '03

Hello, I have released a bugfix for RevisionManager. Thanks goes to Jürgen R. Plasser who found and reported a bug concerning the pserver access method. You may download the archive at http://www.zope.org/Members/philikon/RevisionManager Best regards, Phil

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