ANN: eGenix mxODBC Zope Database Adapter

M.-A. Lemburg
Thu, 11 Dec 2003 21:19:30 +0100



                      mxODBC Zope Database Adapter

                             Version 1.0.7

                 Available for Zope 2.3 through 2.7 on
                  Windows, Linux, Solaris and FreeBSD


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 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, Linux, Solaris and FreeBSD using the same interface on
all platforms.

The mxODBC Zope DA implements high performance 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 throughput than ZODBC Zope DA or similar Zope database
adapters under heavy load.

This makes it ideal for deployment in ZEO Clusters and Zope hosting
environments where stability and high performance are a top priority.


* Zope Level 3 Database Adapter: the mxODBC Zope DA is fully
   multi-threaded and can handle multiple connections to multiple

* 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

* 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

* 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

* 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.


Version 1.0.7 includes the following changes and enhancements:

* Zope 2.7.0 and Python 2.3 are now fully supported.

* The connection pooling was made more robust to allow less capable
   ODBC drivers to work nicely with the mxODBC Zope DA.

* A new option was introduced to let the mxODBC Zope DA return empty
   strings instead of None for SQL NULL values. This should simplify
   porting applications to the mxODBC Zope DA.

* A problem with the MS SQL Server was solved which caused deadlocks
   under heavy load in some application settings.

In short: mxODBC Zope DA is continuing to become the number one
solution for integrating relational databases with Zope applications.


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.


For more information on the mxODBC Zope DA, licensing and download
instructions, please visit our web-site:

You can buy mxODBC Zope DA licenses online from the shop at:


Thank you,
Marc-Andre Lemburg

Professional Python Services directly from the Source  (#1, Dec 11 2003)
>>> Python/Zope Consulting and Support ...
>>> mxODBC.Zope.Database.Adapter ...   
>>> mxODBC, mxDateTime, mxTextTools ...

::: Try mxODBC.Zope.DA for Windows,Linux,Solaris,FreeBSD for free ! ::::