ANN: eGenix mxODBC Zope Database Adapter

Discussion in 'Python' started by M.-A. Lemburg, Dec 11, 2003.

  1. ________________________________________________________________________
    ANNOUNCEMENT

    EGENIX.COM

    mxODBC Zope Database Adapter

    Version 1.0.7

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

    ________________________________________________________________________
    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, 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.

    ________________________________________________________________________
    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 1.0.7 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.

    ________________________________________________________________________
    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 Services directly from the Source (#1, Dec 11 2003)
    >>> Python/Zope Consulting and Support ... http://www.egenix.com/
    >>> mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/
    >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/

    ________________________________________________________________________

    ::: Try mxODBC.Zope.DA for Windows,Linux,Solaris,FreeBSD for free ! ::::
     
    M.-A. Lemburg, Dec 11, 2003
    #1
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