The pycon-multidb branch has been merged into the

trunk, so remove the branch (it's an attractive
(OK, maybe not all _that_ attractive <wink) nuisance
now).

branches/pycon-multidb/COPYING

-See:
-
- - the copyright notice in: COPYRIGHT.txt
-
- - The Zope Public License in LICENSE.txt

branches/pycon-multidb/COPYRIGHT.txt

-Copyright (c) 2004 Zope Corporation and Contributors.
-All Rights Reserved.
-
-This software is subject to the provisions of the Zope Public License,
-Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
-THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
-WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
-FOR A PARTICULAR PURPOSE.

branches/pycon-multidb/LICENSE.txt

-Zope Public License (ZPL) Version 2.1
--------------------------------------
-
-A copyright notice accompanies this license document that
-identifies the copyright holders.
-
-This license has been certified as open source. It has also
-been designated as GPL compatible by the Free Software
-Foundation (FSF).
-
-Redistribution and use in source and binary forms, with or
-without modification, are permitted provided that the
-following conditions are met:
-
-1. Redistributions in source code must retain the
-   accompanying copyright notice, this list of conditions,
-   and the following disclaimer.
-
-2. Redistributions in binary form must reproduce the accompanying
-   copyright notice, this list of conditions, and the
-   following disclaimer in the documentation and/or other
-   materials provided with the distribution.
-
-3. Names of the copyright holders must not be used to
-   endorse or promote products derived from this software
-   without prior written permission from the copyright
-   holders.
-
-4. The right to distribute this software or to use it for
-   any purpose does not give you the right to use
-   Servicemarks (sm) or Trademarks (tm) of the copyright
-   holders. Use of them is covered by separate agreement
-   with the copyright holders.
-
-5. If any files are modified, you must cause the modified
-   files to carry prominent notices stating that you changed
-   the files and the date of any change.
-
-Disclaimer
-
-  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS''
-  AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
-  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
-  AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
-  NO EVENT SHALL THE COPYRIGHT HOLDERS BE
-  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
-  DAMAGE.

branches/pycon-multidb/MANIFEST.in

-include MANIFEST MANIFEST.in
-include *.txt
-include test.py log.ini
-recursive-include src *.h *.c *.xml *.txt *.sh *.conf *.bat
-include src/ZConfig/scripts/zconfig
-graft doc
-graft src/scripts
-graft src/ZConfig/doc
-global-exclude .cvsignore

branches/pycon-multidb/README.txt

-ZODB 3.4
-========
-
-Introduction
-------------
-
-The ZODB package provides a set of tools for using the Zope Object
-Database (ZODB) in Python programs separately from Zope.  The tools
-you get are identical to the ones provided in Zope, because they come
-from the same source repository.  They have been packaged for use in
-non-Zope stand-alone Python applications.
-
-The components you get with the ZODB release are as follows:
-
-- Core ZODB, including the persistence machinery
-- Standard storages such as FileStorage
-- The persistent BTrees modules
-- ZEO
-- ZConfig -- a Zope configuration language
-- documentation
-
-Our primary development platforms are Linux and Windows 2000.  The
-test suite should pass without error on all of these platforms,
-although it can take a long time on Windows -- longer if you use
-ZoneAlarm.  Many particularly slow tests are skipped unless you pass
---all as an argument to test.py.
-
-Compatibility
--------------
-
-ZODB 3.4 requires Python 2.3.4 or later.  For best results, we recommend
-Python 2.3.5.
-
-The Zope 2.8 and X3 releases should be compatible with this version of ZODB.
-Note that Zope 2.7 and higher includes ZEO, so this package should only be
-needed to run a ZEO server.
-
-The ZEO server in ZODB 3.4 is currently incompatible with earlier
-versions of ZODB.  If you want to test the software, you must be
-running this release for both client and server.  A backwards
-compatibility mechanism will be provided in a later release.
-
-Prerequisites
--------------
-
-You must have Python installed.  If you've installed Python from RPM,
-be sure that you've installed the development RPMs too, since ZODB
-builds Python extensions.  If you have the source release of ZODB,
-you will need a C compiler.
-
-Installation
-------------
-
-ZODB is released as a distutils package.  To build it, run the setup
-script::
-
-    % python setup.py build
-
-To test the build, run the test script::
-
-    % python test.py
-
-For more verbose test output, append one or two '-v' arguments to this
-command.
-
-If all the tests succeeded, you can install ZODB using the setup
-script::
-
-    % python setup.py install
-
-This should now make all of ZODB accessible to your Python programs.
-
-Testing
--------
-
-ZODB comes with a large test suite that can be run from the source
-directory before ZODB is installed.  The simplest way to run the tests
-is::
-
-    % python test.py -v
-
-This command will run all the tests, printing a single dot for each
-test.  When it finishes, it will print a test summary.  The exact
-number of tests can vary depending on platform and available
-third-party libraries.::
-
-    Ran 1182 tests in 241.269s
-
-    OK
-
-The test script has many more options.  Use the ``-h`` or ``--help``
-options to see a file list of options.  The default test suite omits
-several tests that depend on third-party software or that take a long
-time to run.  To run all the available tests use the ``--all`` option.
-Running all the tests takes much longer.::
-
-    Ran 1561 tests in 1461.557s
-
-    OK
-
-
-History
--------
-
-The version numbering scheme for ZODB is complicated.  Starting with
-the ZODB 3.1 release, we tried to make it simpler.  Versions prior to
-3.1 had different names and different numbers.  This section describes
-the gory details.
-
-Historically, ZODB was distributed as a part of the Zope application
-server.  Jim Fulton's paper at the Python conference in 2000 described
-a version of ZODB he called ZODB 3, based on an earlier persistent
-object system called BoboPOS.  The earliest versions of ZODB 3 were
-released with Zope 2.0.
-
-Andrew Kuchling extracted ZODB from Zope 2.4.1 and packaged it for
-use by standalone Python programs.  He called this version
-"StandaloneZODB".  Andrew's guide to using ZODB is included in the Doc
-directory.  This version of ZODB was hosted at
-http://sf.net/projects/zodb.  It supported Python 1.5.2, and might
-still be of interest to users of this very old Python version.
-
-Zope Corporation released a version of ZODB called "StandaloneZODB
-1.0" in Feb. 2002.  This release was based on Andrew's packaging, but
-built from the same CVS repository as Zope.  It is roughly equivalent
-to the ZODB in Zope 2.5.
-
-Why not call the current release StandaloneZODB?  The name
-StandaloneZODB is a bit of a mouthful.  The standalone part of the
-name suggests that the Zope version is the real version and that this
-is an afterthought, which isn't the case.  So we're calling this
-release "ZODB".
-
-To make matters worse, we worked on a ZODB4 package for a while and
-made a couple of alpha releases.  We've now abandoned that effort,
-because we didn't have the resources to pursue while also maintaining
-ZODB(3).
-
-License
--------
-
-ZODB is distributed under the Zope Public License, an OSI-approved
-open source license.  Please see the LICENSE.txt file for terms and
-conditions.
-
-The ZODB/ZEO Programming Guide included in the documentation is a
-modified version of Andrew Kuchling's original guide, provided under
-the terms of the GNU Free Documentation License.
-
-
-More information
-----------------
-
-We maintain a Wiki page about all things ZODB, including status on
-future directions for ZODB.  Please see
-
-    http://www.zope.org/Wikis/ZODB
-
-and feel free to contribute your comments.  There is a Mailman mailing
-list in place to discuss all issues related to ZODB.  You can send
-questions to
-
-    zodb-dev@zope.org
-
-or subscribe at
-
-    http://lists.zope.org/mailman/listinfo/zodb-dev
-
-and view its archives at
-
-    http://lists.zope.org/pipermail/zodb-dev
-
-Note that Zope Corp mailing lists have a subscriber-only posting policy.
-
-Andrew's ZODB Programmers Guide is made available in several
-forms, including DVI and HTML.  To view it online, point your
-browser at the file Doc/guide/zodb/index.html
-
-
-Bugs and Patches
-----------------
-
-Bug reports and patches should be added to the Zope Collector, with
-topic "Database":
-
-    http://collector.zope.org/Zope
-
-
-..
-   Local Variables:
-   mode: indented-text
-   indent-tabs-mode: nil
-   sentence-end-double-space: t
-   fill-column: 70
-   End:

branches/pycon-multidb/doc/ACKS

-Acknowledgments
----------------
-
-This file lists people who have contribute code, bug fixes, ideas, and
-other support for ZODB.  Alas it is probably not complete.
-
-Steve Alexander
-Anthony Baxter
-John Belmonte
-Johan Dahlin
-Toby Dickenson
-Fred L. Drake, Jr.
-Casey Duncan
-Jon Dyte
-Martijn Faassen
-Jim Fulton
-Marius Gedminas
-Florent Guillaume
-Shane Hathaway
-Nicholas Henke
-Jeremy Hylton
-Matt Kromer
-Andrew Kuchling
-Andreas Jung
-Brian Lloyd
-Ken Manheimer
-Dieter Maurer
-Chris McDonough
-Gintautas Miliauskas
-Tim Peters
-Chris Petrilli
-Christian Reis
-Guido van Rossum
-Neil Schemenauer
-Tres Seaver
-Sidnei da Silva
-Evan Simpson
-Kapil Thangavelu
-Jens Vagelpohl
-Greg Ward
-Barry Warsaw
-Chris Withers

branches/pycon-multidb/doc/Makefile

-MKHOWTO=mkhowto
-
-MKHTML=$(MKHOWTO) --html --iconserver=. --split=4 --dvips-safe
-
-ZODBTEX = guide/gfdl.tex guide/introduction.tex guide/modules.tex \
-	  guide/prog-zodb.tex guide/storages.tex guide/transactions.tex \
-	  guide/zeo.tex guide/zodb.tex 
-
-default: pdf
-all:	 pdf ps html
-
-pdf:	storage.pdf zodb.pdf
-ps:	storage.ps zodb.ps
-
-html:	storage/storage.html zodb/zodb.html
-
-storage.pdf: storage.tex
-	$(MKHOWTO) --pdf $<
-
-storage.ps: storage.tex
-	$(MKHOWTO) --ps $<
-
-storage/storage.html: storage.tex
-	$(MKHTML) storage.tex
-
-zodb.pdf: $(ZODBTEX)
-	$(MKHOWTO) --pdf guide/zodb.tex
-
-zodb.ps: $(ZODBTEX)
-	$(MKHOWTO) --ps guide/zodb.tex
-
-zodb/zodb.html: $(ZODBTEX)
-	$(MKHTML) guide/zodb.tex
-
-clobber:
-	rm -rf storage.pdf storage.ps storage/ zodb.pdf zodb.ps zodb/

branches/pycon-multidb/doc/README.txt

-ZODB Documentation
-==================
-
-Simple text files
------------------
-
-This is a brief summary of the text documentation included with ZODB.
-Most of the text actually uses the restructured text format.  The
-summary lists the title and path of each document.
-
-BerkeleyDB Storages for ZODB
-Doc/BDBStorage.txt
-
-Using zdctl and zdrun to manage server processes
-Doc/zdctl.txt
-
-ZEO Client Cache
-Doc/ZEO/cache.txt
-
-Running a ZEO Server HOWTO
-Doc/ZEO/howto.txt
-
-ZEO Client Cache Tracing
-Doc/ZEO/trace.txt
-
-Formatted documents
--------------------
-
-There are two documents written the Python documentation tools.
-
-  ZODB/ZEO Programming Guide
-    PDF:  zodb.pdf
-    HTML: zodb/zodb.html
-
-  ZODB Storage API
-    PDF:  storage.pdf
-    HTML: storage/storage.html
-
-The documents located here can be formatted using the mkhowto script
-which is part of the Python documentation tools.  The recommended use
-of this script is to create a symlink from some handy bin/ directory
-to the script, located in Doc/tools/mkhowto in the Python source
-distribution; that script will locate the various support files it
-needs appropriately.
-
-The Makefile contains the commands to produce both the PDF and HTML
-versions of the documents.

branches/pycon-multidb/doc/ZConfig/Makefile

-##############################################################################
-#
-# Copyright (c) 2002, 2003 Zope Corporation and Contributors.
-# All Rights Reserved.
-#
-# This software is subject to the provisions of the Zope Public License,
-# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
-# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
-# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
-# FOR A PARTICULAR PURPOSE.
-#
-##############################################################################
-
-# Rules to convert the documentation to a single PDF file.
-#
-# PostScript, HTML, and plain text output are also supported, though
-# PDF is the default.
-#
-# See the README.txt file for information on the mkhowto program used
-# to generate the formatted versions of the documentation.
-
-.PHONY:	default all html pdf ps text
-
-default:  pdf
-all:	  html pdf ps text
-
-html:   zconfig/zconfig.html
-pdf:	zconfig.pdf
-ps:	zconfig.ps
-text:   zconfig.txt
-
-zconfig/zconfig.html:  zconfig.tex schema.dtd xmlmarkup.perl
-	mkhowto --html $<
-
-zconfig.pdf:  zconfig.tex schema.dtd xmlmarkup.sty
-	mkhowto --pdf $<
-
-zconfig.ps:  zconfig.tex schema.dtd xmlmarkup.sty
-	mkhowto --postscript $<
-
-zconfig.txt: zconfig.tex schema.dtd xmlmarkup.sty
-	mkhowto --text $<
-
-clean:
-	rm -f zconfig.l2h zconfig.l2h~
-
-clobber:  clean
-	rm -f zconfig.pdf zconfig.ps zconfig.txt
-	rm -rf zconfig

branches/pycon-multidb/doc/ZConfig/README.txt

-The zconfig.tex document in this directory contains the reference
-documentation for the ZConfig package.  This documentation is written
-using the Python LaTeX styles.
-
-To format the documentation, get a copy of the Python documentation
-tools (the Doc/ directory from the Python sources), and create a
-symlink to the tools/mkhowto script from some convenient bin/
-directory.  You will need to have a fairly complete set of
-documentation tools installed on your platform; see
-
-    http://www.python.org/doc/current/doc/doc.html
-
-for more information on the tools.
-
-This documentation requires the latest version of the Python
-documentation tools from CVS.

branches/pycon-multidb/doc/ZConfig/schema.dtd

-<!--
-  *************************************************************************
-  Copyright (c) 2002, 2003 Zope Corporation and Contributors.
-  All Rights Reserved.
-
-  This software is subject to the provisions of the Zope Public License,
-  Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
-  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
-  WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
-  FOR A PARTICULAR PURPOSE.
-  *************************************************************************
-
-  Please note that not all documents that conform to this DTD are
-  legal ZConfig schema.  The ZConfig reference manual describes many
-  constraints that are important to understanding ZConfig schema.
-  -->
-
-<!-- DTD for ZConfig schema documents. -->
-
-<!ELEMENT schema (description?, metadefault?, example?,
-                  import*,
-                  (sectiontype | abstracttype)*,
-                  (section | key | multisection | multikey)*)>
-<!ATTLIST schema
-          extends    NMTOKEN  #IMPLIED
-          prefix     NMTOKEN  #IMPLIED
-          handler    NMTOKEN  #IMPLIED
-          keytype    NMTOKEN  #IMPLIED
-          datatype   NMTOKEN  #IMPLIED>
-
-<!ELEMENT component (description?, (sectiontype | abstracttype)*)>
-<!ATTLIST component
-          prefix     NMTOKEN  #IMPLIED>
-
-<!ELEMENT import EMPTY>
-<!ATTLIST import
-          file       CDATA    #IMPLIED
-          package    NMTOKEN  #IMPLIED
-          src        CDATA    #IMPLIED>
-
-<!ELEMENT description (#PCDATA)*>
-<!ATTLIST description
-          format     NMTOKEN  #IMPLIED>
-
-<!ELEMENT metadefault (#PCDATA)*>
-<!ELEMENT example     (#PCDATA)*>
-
-<!ELEMENT sectiontype (description?, 
-                       (section | key | multisection | multikey)*)>
-<!ATTLIST sectiontype
-          name       NMTOKEN  #REQUIRED
-          prefix     NMTOKEN  #IMPLIED
-          keytype    NMTOKEN  #IMPLIED
-          datatype   NMTOKEN  #IMPLIED
-          implements NMTOKEN  #IMPLIED
-          extends    NMTOKEN  #IMPLIED>
-
-<!ELEMENT abstracttype (description?)>
-<!ATTLIST abstracttype
-          name       NMTOKEN  #REQUIRED
-          prefix     NMTOKEN  #IMPLIED>
-
-<!ELEMENT default    (#PCDATA)*>
-<!ATTLIST default
-          key        CDATA    #IMPLIED>
-
-<!ELEMENT key (description?, metadefault?, example?, default*)>
-<!ATTLIST key
-          name       CDATA    #REQUIRED
-          attribute  NMTOKEN  #IMPLIED
-          datatype   NMTOKEN  #IMPLIED
-          handler    NMTOKEN  #IMPLIED
-          required   (yes|no) "no"
-          default    CDATA    #IMPLIED>
-
-<!ELEMENT multikey (description?, metadefault?, example?, default*)>
-<!ATTLIST multikey
-          name       CDATA    #REQUIRED
-          attribute  NMTOKEN  #IMPLIED
-          datatype   NMTOKEN  #IMPLIED
-          handler    NMTOKEN  #IMPLIED
-          required   (yes|no) "no">
-
-<!ELEMENT section (description?)>
-<!ATTLIST section
-          name       CDATA    #REQUIRED
-          attribute  NMTOKEN  #IMPLIED
-          type       NMTOKEN  #REQUIRED
-          handler    NMTOKEN  #IMPLIED
-          required   (yes|no) "no">
-
-<!ELEMENT multisection (description?)>
-<!ATTLIST multisection
-          name       CDATA    #REQUIRED
-          attribute  NMTOKEN  #IMPLIED
-          type       NMTOKEN  #REQUIRED
-          handler    NMTOKEN  #IMPLIED
-          required   (yes|no) "no">

branches/pycon-multidb/doc/ZConfig/xmlmarkup.perl

-##############################################################################
-#
-# Copyright (c) 2003 Zope Corporation and Contributors.
-# All Rights Reserved.
-#
-# This software is subject to the provisions of the Zope Public License,
-# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
-# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
-# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
-# FOR A PARTICULAR PURPOSE.
-#
-##############################################################################
-
-# LaTeX2HTML support for the xmlmarkup package.  Doesn't do indexing.
-
-package main;
-
-
-sub do_cmd_element{
-    local($_) = @_;
-    my $name = next_argument();
-    return "<tt class='element'>$name</tt>" . $_;
-}
-
-sub do_cmd_attribute{
-    local($_) = @_;
-    my $name = next_argument();
-    return "<tt class='attribute'>$name</tt>" . $_;
-}
-
-sub do_env_attributedesc{
-    local($_) = @_;
-    my $name = next_argument();
-    my $valuetype = next_argument();
-    return ("\n<dl class='macrodesc'>"
-            . "\n<dt><b><tt class='macro'>$name</tt></b>"
-            . "&nbsp;&nbsp;&nbsp;($valuetype)"
-            . "\n<dd>"
-            . $_
-            . "</dl>");
-}
-
-sub do_env_elementdesc{
-    local($_) = @_;
-    my $name = next_argument();
-    my $contentmodel = next_argument();
-    return ("\n<dl class='elementdesc'>"
-            . "\n<dt class='start-tag'><tt>&lt;"
-            . "<b class='element'>$name</b>&gt;</tt>"
-            . "\n<dd class='content-model'>$contentmodel"
-            . "\n<dt class='endtag'><tt>&lt;/"
-            . "<b class='element'>$name</b>&gt;</tt>"
-            . "\n<dd class='descrition'>"
-            . $_
-            . "</dl>");
-}
-
-1;				# Must end with this, because Perl is bogus.

branches/pycon-multidb/doc/ZConfig/xmlmarkup.sty

-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-%
-% Copyright (c) 2003 Zope Corporation and Contributors.
-% All Rights Reserved.
-%
-% This software is subject to the provisions of the Zope Public License,
-% Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
-% THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
-% WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-% WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
-% FOR A PARTICULAR PURPOSE.
-%
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-% Define some simple markup for the LaTeX command documentation:
-
-\ProvidesPackage{xmlmarkup}
-\RequirePackage{python}      % fulllineitems environment
-
-\newcommand{\element}[1]{\code{#1}}
-\newcommand{\attribute}[1]{\code{#1}}
-
-% \begin{elementdesc}{type}{content-model}
-\newenvironment{elementdesc}[2]{
-  \begin{fulllineitems}
-    \item[\code{\textless{\bfseries #1}\textgreater}]
-    \code{#2}
-    \item[\code{\textless/{\bfseries #1}\textgreater}]
-    \index{#1 element@\py@idxcode{#1} element}
-    \index{elements!#1@\py@idxcode{#1}}
-}{\end{fulllineitems}}
-
-% \begin{attributedesc}{name}{content-type}
-\newenvironment{attributedesc}[2]{
-  \begin{fulllineitems}
-    \item[\code{\bfseries#1}{\quad(#2)}]
-    \index{#1@\py@idxcode{#1}}
-}{\end{fulllineitems}}

branches/pycon-multidb/doc/ZEO/README.txt

-ZEO Documentation
-=================
-
-This directory contains ZEO documentation.
-
-howto.txt
-    The first place to look.
-
-    It provides a high-level overview of ZEO features and details on
-    how to install and configure clients and servers.  Includes a 
-    configuration reference.
-
-cache.txt
-    Explains how the client cache works.
-    
-trace.txt
-    Describe cache trace tool used to determine ideal cache size.
-
-ZopeREADME.txt
-    A somewhat dated description of how to integrate ZEO with Zope.
-    It provides a few hints that are not yet in howto.txt.

branches/pycon-multidb/doc/ZEO/ZopeREADME.txt

-Zope Enterprise Objects (ZEO)
-
-  Installation
-
-    ZEO 2.0 requires Zope 2.4 or higher and Python 2.1 or higher.
-    If you use Python 2.1, we recommend the latest minor release
-    (2.1.3 as of this writing) because it includes a few bug fixes
-    that affect ZEO.
-
-    Put the package (the ZEO directory, without any wrapping directory
-    included in a distribution) in your Zope lib/python.
-
-    The setup.py script in the top-level ZEO directory can also be
-    used.  Run "python setup.py install --home=ZOPE" where ZOPE is the
-    top-level Zope directory.
-
-    You can test ZEO before installing it with the test script::
-
-      python test.py -v
-
-    Run the script with the -h option for a full list of options.  The
-    ZEO 2.0b2 release contains 122 unit tests on Unix.
-
-  Starting (and configuring) the ZEO Server
-
-    To start the storage server, go to your Zope install directory and
-    run::
-
-      python lib/python/ZEO/start.py -p port_number
-
-    This run the storage sever under zdaemon.  zdaemon automatically
-    restarts programs that exit unexpectedly.
-
-    The server and the client don't have to be on the same machine.
-    If they are on the same machine, then you can use a Unix domain
-    socket::
-
-      python lib/python/ZEO/start.py -U filename
-
-    The start script provides a number of options not documented here.
-    See doc/start.txt for more information.
-        
-  Running Zope as a ZEO client
-
-    To get Zope to use the server, create a custom_zodb module,
-    custom_zodb.py, in your Zope install directory, so that Zope uses a
-    ClientStorage::
-
-      from ZEO.ClientStorage import ClientStorage
-      Storage = ClientStorage(('', port_number))
-
-    You can specify a host name (rather than '') if you want.  The port
-    number is, of course, the port number used to start the storage
-    server.
-
-    You can also give the name of a Unix domain socket file::
-
-      from ZEO.ClientStorage import ClientStorage
-      Storage = ClientStorage(filename)
-
-    There are a number of configuration options available for the
-    ClientStorage. See doc/ClientStorage.txt for details.
-
-    If you want a persistent client cache which retains cache contents
-    across ClientStorage restarts, you need to define the environment
-    variable, ZEO_CLIENT, or set the client keyword argument to the
-    constructor to a unique name for the client.  This is needed so
-    that unique cache name files can be computed.  Otherwise, the
-    client cache is stored in temporary files which are removed when
-    the ClientStorage shuts down.  For example, to start two Zope
-    processes with unique caches, use something like::
-
-      python z2.py -P8700 ZEO_CLIENT=8700
-      python z2.py -P8800 ZEO_CLIENT=8800
-
-  Zope product installation
-
-    Normally, Zope updates the Zope database during startup to reflect
-    product changes or new products found. It makes no sense for
-    multiple ZEO clients to do the same installation. Further, if
-    different clients have different software installed, the correct
-    state of the database is ambiguous.
-
-    Zope will not modify the Zope database during product installation
-    if the environment variable ZEO_CLIENT is set.
-
-    Normally, Zope ZEO clients should be run with ZEO_CLIENT set so
-    that product initialization is not performed.
-
-    If you do install new Zope products, then you need to take a
-    special step to cause the new products to be properly registered
-    in the database.  The easiest way to do this is to start Zope
-    once with the environment variable FORCE_PRODUCT_LOAD set.
-
-    The interaction between ZEO and Zope product installation is
-    unfortunate.

branches/pycon-multidb/doc/ZEO/cache.txt

-ZEO Client Cache
-
-  The Client cache provides a disk based cache for each ZEO client.
-  The client cache allows reads to be done from local disk rather than
-  by remote access to the storage server.
-
-  The cache may be persistent or transient. If the cache is
-  persistent, then the cache files are retained for use after process
-  restarts. A non-persistent cache uses temporary files that are
-  removed when the client storage is closed.
-
-  The client cache is managed as two files. The cache manager
-  endeavors to maintain the two files at sizes less than or equal to
-  one half the cache size.  One of the cache files is designated the
-  "current" cache file. The other cache file is designated the "old"
-  cache file, if it exists.  All writes are done to the current cache
-  files.  When transactions are committed on the client, transactions
-  are not split between cache files. Large transactions may cause
-  cache files to be larger than one half the target cache size.
-
-  The life of the cache is as follows:
-
-  - When the cache is created, the first of the two cache files is
-    created and designated the "current" cache file.
-
-  - Cache records are written to the cache file, either as
-    transactions commit locally, or as data are loaded from the
-    server.
-
-  - When the cache file size exceeds one half the cache size, the
-    second cache file is created and designated the "current" cache
-    file.  The first cache file becomes the "old" cache file.
-
-  - Cache records are written to the new current cache file, either as
-    transactions commit locally, or as data are loaded from the
-    server.
-
-  - When a cache hit is found in the old cache file, it is copied to
-    the current cache file.
-
-  - When the current cache file size exceeds one half the cache size, the
-    first cache file is recreated and designated the "current" cache
-    file.  The second cache file becomes the "old" cache file.
-
-  and so on.
-
-  Persistent cache files are created in the directory named in the
-  'var' argument to the ClientStorage (see ClientStorage.txt) or in
-  the 'var' subdirectory of the directory given by the INSTANCE_HOME
-  builtin (created by Zope), or in the current working directory.
-  Persistent cache files have names of the form::
-
-    cstorage-client-n.zec
-
-  where:
-
-    storage -- the storage name
-
-    client -- the client name, as given by the 'ZEO_CLIENT' environment
-      variable or the 'client' argument provided when creating a client
-      storage.
-
-    n -- '0' for the first cache file and '1' for the second. 
-
-  For example, the second cache file for storage 'spam' and client 8881
-  would be named 'cspam-8881-1.zec'.
-

branches/pycon-multidb/doc/ZEO/trace.txt

-ZEO Client Cache Tracing
-========================
-
-An important question for ZEO users is: how large should the ZEO
-client cache be?  ZEO 2 (as of ZEO 2.0b2) has a new feature that lets
-you collect a trace of cache activity and tools to analyze this trace,
-enabling you to make an informed decision about the cache size.
-
-Don't confuse the ZEO client cache with the Zope object cache.  The
-ZEO client cache is only used when an object is not in the Zope object
-cache; the ZEO client cache avoids roundtrips to the ZEO server.
-
-Enabling Cache Tracing
-----------------------
-
-To enable cache tracing, set the environment variable ZEO_CACHE_TRACE
-to the name of a file to which the ZEO client process can write.  ZEO
-will append a hyphen and the storage name to the filename, to
-distinguish different storages.  If the file doesn't exist, the ZEO
-will try to create it.  If there are problems with the file, a log
-message is written to the standard Zope log file.  To start or stop
-tracing, the ZEO client process (typically a Zope application server)
-must be restarted.
-
-The trace file can grow pretty quickly; on a moderately loaded server,
-we observed it growing by 5 MB per hour.  The file consists of binary
-records, each 24 bytes long; a detailed description of the record
-lay-out is given in stats.py.  No sensitive data is logged.
-
-Analyzing a Cache Trace
------------------------
-
-The stats.py command-line tool is the first-line tool to analyze a
-cache trace.  Its default output consists of two parts: a one-line
-summary of essential statistics for each segment of 15 minutes,
-interspersed with lines indicating client restarts and "cache flip
-events" (more about those later), followed by a more detailed summary
-of overall statistics.
-
-The most important statistic is probably the "hit rate", a percentage
-indicating how many requests to load an object could be satisfied from
-the cache.  Hit rates around 70% are good.  90% is probably close to
-the theoretical maximum.  If you see a hit rate under 60% you can
-probably improve the cache performance (and hence your Zope
-application server's performance) by increasing the ZEO cache size.
-This is normally configured using the cache_size keyword argument to
-the ClientStorage() constructor in your custom_zodb.py file.  The
-default cache size is 20 MB.
-
-The stats.py tool shows its command line syntax when invoked without
-arguments.  The tracefile argument can be a gzipped file if it has a
-.gz extension.  It will read from stdin (assuming uncompressed data)
-if the tracefile argument is '-'.
-
-Simulating Different Cache Sizes
---------------------------------
-
-Based on a cache trace file, you can make a prediction of how well the
-cache might do with a different cache size.  The simul.py tool runs an
-accurate simulation of the ZEO client cache implementation based upon
-the events read from a trace file.  A new simulation is started each
-time the trace file records a client restart event; if a trace file
-contains more than one restart event, a separate line is printed for
-each simulation, and line with overall statistics is added at the end.
-
-Example, assuming the trace file is in /tmp/cachetrace.log::
-
-    $ python simul.py -s 100 /tmp/cachetrace.log
-      START TIME  DURATION    LOADS     HITS INVALS WRITES  FLIPS HITRATE
-    Sep  4 11:59     38:01    59833    40473    257     20      2  67.6%
-    $
-
-This shows that with a 100 MB cache size, the cache hit rate is
-67.6%.  So let's try this again with a 200 MB cache size::
-
-    $ python simul.py -s 200 /tmp/cachetrace.log
-      START TIME  DURATION    LOADS     HITS INVALS WRITES  FLIPS HITRATE
-    Sep  4 11:59     38:01    59833    40921    258     20      1  68.4%
-    $
-
-This showed hardly any improvement.  So let's try a 300 MB cache
-size::
-
-    $ python2.0 simul.py -s 300 /tmp/cachetrace.log
-    ZEOCacheSimulation, cache size 300,000,000 bytes
-      START TIME  DURATION    LOADS     HITS INVALS WRITES  FLIPS HITRATE
-    Sep  4 11:59     38:01    59833    40921    258     20      0  68.4%
-    $ 
-
-This shows that for this particular trace file, the maximum attainable
-hit rate is 68.4%.  This is probably caused by the fact that nearly a
-third of the objects mentioned in the trace were loaded only once --
-the cache only helps if an object is loaded more than once.
-
-The simul.py tool also supports simulating different cache
-strategies.  Since none of these are implemented, these are not
-further documented here.
-
-Cache Flips
------------
-
-The cache uses two files, which are managed as follows:
-
-  - Data are written to file 0 until file 0 exceeds limit/2 in size.
-
-  - Data are written to file 1 until file 1 exceeds limit/2 in size.
-
-  - File 0 is truncated to size 0 (or deleted and recreated).
-
-  - Data are written to file 0 until file 0 exceeds limit/2 in size.
-
-  - File 1 is truncated to size 0 (or deleted and recreated).
-
-  - Data are written to file 1 until file 1 exceeds limit/2 in size.
-
-and so on.
-
-A switch from file 0 to file 1 is called a "cache flip".  At all cache
-flips except the first, half of the cache contents is wiped out.  This
-affects cache performance.  How badly this impact is can be seen from
-the per-15-minutes summaries printed by stats.py.  The -i option lets
-you choose a smaller summary interval which shows the impact more
-acutely.
-
-The simul.py tool shows the number of cache flips in the FLIPS column.
-If you see more than one flip per hour the cache may be too small.

branches/pycon-multidb/doc/guide/README

-This directory contains Andrew Kuchling's programmer's guide to ZODB
-and ZEO.  It was originally taken from Andrew's zodb.sf.net project on
-SourceForge.  Because the original version is no longer updated, this
-version is best viewed as an independent fork now.

branches/pycon-multidb/doc/guide/TODO

-Write section on __setstate__
-Continue working on it
-Suppress the full GFDL text in the PDF/PS versions
-

branches/pycon-multidb/doc/guide/admin.tex

-
-%  Administration
-%    Importing and exporting data
-%    Disaster recovery/avoidance
-%    Security
-

branches/pycon-multidb/doc/guide/chatter.py

-
-import sys, time, os, random
-
-import transaction
-from persistent import Persistent
-
-from ZEO import ClientStorage
-import ZODB
-from ZODB.POSException import ConflictError
-from BTrees import OOBTree
-
-class ChatSession(Persistent):
-
-    """Class for a chat session.
-    Messages are stored in a B-tree, indexed by the time the message
-    was created.  (Eventually we'd want to throw messages out,
-
-    add_message(message) -- add a message to the channel
-    new_messages()       -- return new messages since the last call to
-                            this method
-
-
-    """
-
-    def __init__(self, name):
-        """Initialize new chat session.
-        name -- the channel's name
-        """
-
-        self.name = name
-
-        # Internal attribute: _messages holds all the chat messages.
-        self._messages = OOBTree.OOBTree()
-
-
-    def new_messages(self):
-        "Return new messages."
-
-        # self._v_last_time is the time of the most recent message
-        # returned to the user of this class.
-        if not hasattr(self, '_v_last_time'):
-            self._v_last_time = 0
-
-        new = []
-        T = self._v_last_time
-
-        for T2, message in self._messages.items():
-            if T2 > T:
-                new.append( message )
-                self._v_last_time = T2
-
-        return new
-
-    def add_message(self, message):
-        """Add a message to the channel.
-        message -- text of the message to be added
-        """
-
-        while 1:
-            try:
-                now = time.time()
-                self._messages[ now ] = message
-                transaction.commit()
-            except ConflictError:
-                # Conflict occurred; this process should pause and
-                # wait for a little bit, then try again.
-                time.sleep(.2)
-                pass
-            else:
-                # No ConflictError exception raised, so break
-                # out of the enclosing while loop.
-                break
-        # end while
-
-def get_chat_session(conn, channelname):
-    """Return the chat session for a given channel, creating the session
-    if required."""
-
-    # We'll keep a B-tree of sessions, mapping channel names to
-    # session objects.  The B-tree is stored at the ZODB's root under
-    # the key 'chat_sessions'.
-    root = conn.root()
-    if not root.has_key('chat_sessions'):
-        print 'Creating chat_sessions B-tree'
-        root['chat_sessions'] = OOBTree.OOBTree()
-        transaction.commit()
-
-    sessions = root['chat_sessions']
-
-    # Get a session object corresponding to the channel name, creating
-    # it if necessary.
-    if not sessions.has_key( channelname ):
-        print 'Creating new session:', channelname
-        sessions[ channelname ] = ChatSession(channelname)
-        transaction.commit()
-
-    session = sessions[ channelname ]
-    return session
-
-
-if __name__ == '__main__':
-    if len(sys.argv) != 2:
-        print 'Usage: %s <channelname>' % sys.argv[0]
-        sys.exit(0)
-
-    storage = ClientStorage.ClientStorage( ('localhost', 9672) )
-    db = ZODB.DB( storage )
-    conn = db.open()
-
-    s = session = get_chat_session(conn, sys.argv[1])
-
-    messages = ['Hi.', 'Hello', 'Me too', "I'M 3L33T!!!!"]
-
-    while 1:
-        # Send a random message
-        msg = random.choice(messages)
-        session.add_message( '%s: pid %i' % (msg,os.getpid() ))
-
-        # Display new messages
-        for msg in session.new_messages():
-            print msg
-
-        # Wait for a few seconds
-        pause = random.randint( 1, 4 )
-        time.sleep( pause )

branches/pycon-multidb/doc/guide/indexing.tex

-
-% Indexing Data
-%    BTrees
-%    Full-text indexing
-

branches/pycon-multidb/doc/guide/introduction.tex

-
-%Introduction
-%   What is ZODB?
-%   What is ZEO?
-%   OODBs vs. Relational DBs
-%   Other OODBs
-
-\section{Introduction}
-
-This guide explains how to write Python programs that use the Z Object
-Database (ZODB) and Zope Enterprise Objects (ZEO).  The latest version
-of the guide is always available at
-\url{http://www.zope.org/Wikis/ZODB/guide/index.html}.
-
-\subsection{What is the ZODB?}
-
-The ZODB is a persistence system for Python objects.  Persistent
-programming languages provide facilities that automatically write
-objects to disk and read them in again when they're required by a
-running program.  By installing the ZODB, you add such facilities to
-Python.
-
-It's certainly possible to build your own system for making Python
-objects persistent.  The usual starting points are the \module{pickle}
-module, for converting objects into a string representation, and
-various database modules, such as the \module{gdbm} or \module{bsddb}
-modules, that provide ways to write strings to disk and read them
-back.  It's straightforward to combine the \module{pickle} module and
-a database module to store and retrieve objects, and in fact the
-\module{shelve} module, included in Python's standard library, does
-this.
-
-The downside is that the programmer has to explicitly manage objects,
-reading an object when it's needed and writing it out to disk when the
-object is no longer required.  The ZODB manages objects for you,
-keeping them in a cache, writing them out to disk when they are
-modified, and dropping them from the cache if they haven't been used
-in a while.
-
-
-\subsection{OODBs vs. Relational DBs}
-
-Another way to look at it is that the ZODB is a Python-specific
-object-oriented database (OODB).  Commercial object databases for C++
-or Java often require that you jump through some hoops, such as using
-a special preprocessor or avoiding certain data types.  As we'll see,
-the ZODB has some hoops of its own to jump through, but in comparison
-the naturalness of the ZODB is astonishing.
-
-Relational databases (RDBs) are far more common than OODBs.
-Relational databases store information in tables; a table consists of
-any number of rows, each row containing several columns of
-information.  (Rows are more formally called relations, which is where
-the term ``relational database'' originates.)
-
-Let's look at a concrete example.  The example comes from my day job
-working for the MEMS Exchange, in a greatly simplified version.  The
-job is to track process runs, which are lists of manufacturing steps
-to be performed in a semiconductor fab.  A run is owned by a
-particular user, and has a name and assigned ID number.  Runs consist
-of a number of operations; an operation is a single step to be
-performed, such as depositing something on a wafer or etching
-something off it.
-
-Operations may have parameters, which are additional information
-required to perform an operation.  For example, if you're depositing
-something on a wafer, you need to know two things: 1) what you're
-depositing, and 2) how much should be deposited.  You might deposit
-100 microns of silicon oxide, or 1 micron of copper.
-
-Mapping these structures to a relational database is straightforward:
-
-\begin{verbatim}
-CREATE TABLE runs (
-  int      run_id,
-  varchar  owner,
-  varchar  title,
-  int      acct_num,
-  primary key(run_id)
-);
-
-CREATE TABLE operations (
-  int      run_id,
-  int      step_num, 
-  varchar  process_id,
-  PRIMARY KEY(run_id, step_num),
-  FOREIGN KEY(run_id) REFERENCES runs(run_id),
-);
-
-CREATE TABLE parameters (
-  int      run_id,
-  int      step_num, 
-  varchar  param_name, 
-  varchar  param_value,
-  PRIMARY KEY(run_id, step_num, param_name)
-  FOREIGN KEY(run_id, step_num) 
-     REFERENCES operations(run_id, step_num),
-);  
-\end{verbatim}
-
-In Python, you would write three classes named \class{Run},
-\class{Operation}, and \class{Parameter}.  I won't present code for
-defining these classes, since that code is uninteresting at this
-point. Each class would contain a single method to begin with, an
-\method{__init__} method that assigns default values, such as 0 or
-\code{None}, to each attribute of the class.
-
-It's not difficult to write Python code that will create a \class{Run}
-instance and populate it with the data from the relational tables;
-with a little more effort, you can build a straightforward tool,
-usually called an object-relational mapper, to do this automatically.
-(See
-\url{http://www.amk.ca/python/unmaintained/ordb.html} for a quick hack
-at a Python object-relational mapper, and
-\url{http://www.python.org/workshops/1997-10/proceedings/shprentz.html}
-for Joel Shprentz's more successful implementation of the same idea;
-Unlike mine, Shprentz's system has been used for actual work.)
-
-However, it is difficult to make an object-relational mapper
-reasonably quick; a simple-minded implementation like mine is quite
-slow because it has to do several queries to access all of an object's
-data.  Higher performance object-relational mappers cache objects to
-improve performance, only performing SQL queries when they actually
-need to.
-
-That helps if you want to access run number 123 all of a sudden.  But
-what if you want to find all runs where a step has a parameter named
-'thickness' with a value of 2.0?  In the relational version, you have
-two unappealing choices:
-
-\begin{enumerate}
- \item Write a specialized SQL query for this case: \code{SELECT run_id
-  FROM operations WHERE param_name = 'thickness' AND param_value = 2.0}
-  
-  If such queries are common, you can end up with lots of specialized
-  queries.  When the database tables get rearranged, all these queries
-  will need to be modified.
-
- \item An object-relational mapper doesn't help much.  Scanning
-  through the runs means that the the mapper will perform the required
-  SQL queries to read run \#1, and then a simple Python loop can check
-  whether any of its steps have the parameter you're looking for.
-  Repeat for run \#2, 3, and so forth.  This does a vast
-  number of SQL queries, and therefore is incredibly slow.
-
-\end{enumerate}
-
-An object database such as ZODB simply stores internal pointers from
-object to object, so reading in a single object is much faster than
-doing a bunch of SQL queries and assembling the results. Scanning all
-runs, therefore, is still inefficient, but not grossly inefficient.
-
-\subsection{What is ZEO?}
-
-The ZODB comes with a few different classes that implement the
-\class{Storage} interface.  Such classes handle the job of
-writing out Python objects to a physical storage medium, which can be
-a disk file (the \class{FileStorage} class), a BerkeleyDB file
-(\class{BDBFullStorage}), a relational database
-(\class{DCOracleStorage}), or some other medium.  ZEO adds
-\class{ClientStorage}, a new \class{Storage} that doesn't write to
-physical media but just forwards all requests across a network to a
-server.  The server, which is running an instance of the
-\class{StorageServer} class, simply acts as a front-end for some
-physical \class{Storage} class.  It's a fairly simple idea, but as
-we'll see later on in this document, it opens up many possibilities.
-
-\subsection{About this guide}
-
-The primary author of this guide works on a project which uses the
-ZODB and ZEO as its primary storage technology.  We use the ZODB to
-store process runs and operations, a catalog of available processes,
-user information, accounting information, and other data.  Part of the
-goal of writing this document is to make our experience more widely
-available.  A few times we've spent hours or even days trying to
-figure out a problem, and this guide is an attempt to gather up the
-knowledge we've gained so that others don't have to make the same
-mistakes we did while learning.
-
-The author's ZODB project is described in a paper available here,
-\url{http://www.amk.ca/python/writing/mx-architecture/}
-
-This document will always be a work in progress.  If you wish to
-suggest clarifications or additional topics, please send your comments to
-\email{zodb-dev@zope.org}.
-
-\subsection{Acknowledgements}
-
-Andrew Kuchling wrote the original version of this guide, which
-provided some of the first ZODB documentation for Python programmers.
-His initial version has been updated over time by Jeremy Hylton and
-Tim Peters.
-
-I'd like to thank the people who've pointed out inaccuracies and bugs,
-offered suggestions on the text, or proposed new topics that should be
-covered: Jeff Bauer, Willem Broekema, Thomas Guettler,
-Chris McDonough, George Runyan.

branches/pycon-multidb/doc/guide/links.tex

-% links.tex
-% Collection of relevant links
-
-\section{Resources}
-
-Introduction to the Zope Object Database, by Jim Fulton:
-\\
-Goes into much greater detail, explaining advanced uses of the ZODB and 
-how it's actually implemented.  A definitive reference, and highly recommended.
-\\
-\url{http://www.python.org/workshops/2000-01/proceedings/papers/fulton/zodb3.html}
-
-Persistent Programing with ZODB, by Jeremy Hylton and Barry Warsaw:
-\\
-Slides for a tutorial presented at the 10th Python conference.  Covers
-much of the same ground as this guide, with more details in some areas
-and less in others.
-\\
-\url{http://www.zope.org/Members/bwarsaw/ipc10-slides}
-
-

branches/pycon-multidb/doc/guide/storages.tex

-
-% Storages
-%    FileStorage
-%    BerkeleyStorage
-%    OracleStorage
-
-\section{Storages}
-
-This chapter will examine the different \class{Storage} subclasses
-that are considered stable, discuss their varying characteristics, and
-explain how to administer them.
-
-\subsection{Using Multiple Storages}
-
-XXX explain mounting substorages
-
-\subsection{FileStorage}
-
-\subsection{BDBFullStorage}
-
-\subsection{OracleStorage}
-

branches/pycon-multidb/doc/guide/transactions.tex

-%Transactions and Versioning
-%   Committing and Aborting
-%   Subtransactions
-%   Undoing
-%   Versions
-%   Multithreaded ZODB Programs
-
-
-\section{Transactions and Versioning}
-
-\subsection{Committing and Aborting}
-
-Changes made during a transaction don't appear in the database until
-the transaction commits.  This is done by calling the \method{commit()}
-method of the current \class{Transaction} object, where the latter is
-obtained from the \method{get()} method of the current transaction
-manager.  If the default thread transaction manager is being used, then
-\code{transaction.commit()} suffices.
-
-Similarly, a transaction can be explicitly aborted (all changes within
-the transaction thrown away) by invoking the \method{abort()} method
-of the current \class{Transaction} object, or simply
-\code{transaction.abort()} if using the default thread transaction manager.
-
-Prior to ZODB 3.3, if a commit failed (meaning the \code{commit()} call
-raised an exception), the transaction was implicitly aborted and a new
-transaction was implicitly started.  This could be very surprising if the
-exception was suppressed, and especially if the failing commit was one
-in a sequence of subtransaction commits.
-
-So, starting with ZODB 3.3, if a commit fails, all further attempts to
-commit, join, or register with the transaction raise
-\exception{ZODB.POSException.TransactionFailedError}.  You must explicitly
-start a new transaction then, either by calling the \method{abort()} method
-of the current transaction, or by calling the \method{begin()} method of the
-current transaction's transaction manager.
-
-\subsection{Subtransactions}
-
-Subtransactions can be created within a transaction.  Each
-subtransaction can be individually committed and aborted, but the
-changes within a subtransaction are not truly committed until the
-containing transaction is committed.
-
-The primary purpose of subtransactions is to decrease the memory usage
-of transactions that touch a very large number of objects.  Consider a
-transaction during which 200,000 objects are modified.  All the
-objects that are modified in a single transaction have to remain in
-memory until the transaction is committed, because the ZODB can't
-discard them from the object cache.  This can potentially make the
-memory usage quite large.  With subtransactions, a commit can be be
-performed at intervals, say, every 10,000 objects.  Those 10,000
-objects are then written to permanent storage and can be purged from
-the cache to free more space.
-
-To commit a subtransaction instead of a full transaction,
-pass a true value to the \method{commit()}
-or \method{abort()} method of the \class{Transaction} object.
-
-\begin{verbatim}
-# Commit a subtransaction
-transaction.commit(True)
-
-# Abort a subtransaction
-transaction.abort(True)
-\end{verbatim}
-
-A new subtransaction is automatically started upon successful committing
-or aborting the previous subtransaction.
-
-
-\subsection{Undoing Changes}
-
-Some types of \class{Storage} support undoing a transaction even after
-it's been committed.  You can tell if this is the case by calling the
-\method{supportsUndo()} method of the \class{DB} instance, which
-returns true if the underlying storage supports undo.  Alternatively
-you can call the \method{supportsUndo()} method on the underlying
-storage instance.
-
-If a database supports undo, then the \method{undoLog(\var{start},
-\var{end}\optional{, func})} method on the \class{DB} instance returns
-the log of past transactions, returning transactions between the times
-\var{start} and \var{end}, measured in seconds from the epoch.
-If present, \var{func} is a function that acts as a filter on the
-transactions to be returned; it's passed a dictionary representing
-each transaction, and only transactions for which \var{func} returns
-true will be included in the list of transactions returned to the
-caller of \method{undoLog()}.  The dictionary contains keys for
-various properties of the transaction.  The most important keys are
-\samp{id}, for the transaction ID, and \samp{time}, for the time at
-which the transaction was committed.
-
-\begin{verbatim}
->>> print storage.undoLog(0, sys.maxint)
-[{'description': '',
-  'id': 'AzpGEGqU/0QAAAAAAAAGMA',
-  'time': 981126744.98,
-  'user_name': ''},
- {'description': '',
-  'id': 'AzpGC/hUOKoAAAAAAAAFDQ',
-  'time': 981126478.202,
-  'user_name': ''}
-  ...
-\end{verbatim}
-
-To store a description and a user name on a commit, get the current
-transaction and call the \method{note(\var{text})} method to store a
-description, and the
-\method{setUser(\var{user_name})} method to store the user name.
-While \method{setUser()} overwrites the current user name and replaces
-it with the new value, the \method{note()} method always adds the text
-to the transaction's description, so it can be called several times to
-log several different changes made in the course of a single
-transaction.
-
-\begin{verbatim}
-transaction.get().setUser('amk')
-transaction.get().note('Change ownership')
-\end{verbatim}
-
-To undo a transaction, call the \method{DB.undo(\var{id})} method,
-passing it the ID of the transaction to undo.  If the transaction
-can't be undone, a \exception{ZODB.POSException.UndoError} exception
-will be raised, with the message ``non-undoable
-transaction''.  Usually this will happen because later transactions
-modified the objects affected by the transaction you're trying to
-undo.
-
-After you call \method{undo()} you must commit the transaction for the
-undo to actually be applied.
-\footnote{There are actually two different ways a storage can
-implement the undo feature.  Most of the storages that ship with ZODB
-use the transactional form of undo described in the main text.  Some
-storages may use a non-transactional undo makes changes visible
-immediately.}  There is one glitch in the undo process.  The thread
-that calls undo may not see the changes to the object until it calls
-\method{Connection.sync()} or commits another transaction.
-
-\subsection{Versions}
-
-\begin{notice}[warning]
-  Versions should be avoided.  They're going to be deprecated,
-  replaced by better approaches to long-running transactions.
-\end{notice}
-
-While many subtransactions can be contained within a single regular
-transaction, it's also possible to contain many regular transactions
-within a long-running transaction, called a version in ZODB
-terminology.  Inside a version, any number of transactions can be
-created and committed or rolled back, but the changes within a version
-are not made visible to other connections to the same ZODB.
-
-Not all storages support versions, but you can test for versioning
-ability by calling \method{supportsVersions()} method of the
-\class{DB} instance, which returns true if the underlying storage
-supports versioning.
-
-A version can be selected when creating the \class{Connection}
-instance using the \method{DB.open(\optional{\var{version}})} method.
-The \var{version} argument must be a string that will be used as the
-name of the version.
-
-\begin{verbatim}
-vers_conn = db.open(version='Working version')
-\end{verbatim}
-
-Transactions can then be committed and aborted using this versioned
-connection.  Other connections that don't specify a version, or
-provide a different version name, will not see changes committed
-within the version named \samp{Working~version}.  To commit or abort a
-version, which will either make the changes visible to all clients or
-roll them back, call the \method{DB.commitVersion()} or
-\method{DB.abortVersion()} methods.
-XXX what are the source and dest arguments for?
-
-The ZODB makes no attempt to reconcile changes between different
-versions.  Instead, the first version which modifies an object will
-gain a lock on that object.  Attempting to modify the object from a
-different version or from an unversioned connection will cause a
-\exception{ZODB.POSException.VersionLockError} to be raised:
-
-\begin{verbatim}
-from ZODB.POSException import VersionLockError
-
-try:
-    transaction.commit()
-except VersionLockError, (obj_id, version):
-    print ('Cannot commit; object %s '
-           'locked by version %s' % (obj_id, version))
-\end{verbatim}
-
-The exception provides the ID of the locked object, and the name of
-the version having a lock on it.
-
-\subsection{Multithreaded ZODB Programs}
-
-ZODB databases can be accessed from multithreaded Python programs.
-The \class{Storage} and \class{DB} instances can be shared among
-several threads, as long as individual \class{Connection} instances
-are created for each thread.
-

branches/pycon-multidb/doc/guide/zodb.tex

-\documentclass{howto}
-
-\title{ZODB/ZEO Programming Guide}
-\release{3.4a0}
-\date{\today}
-
-\author{A.M.\ Kuchling}
-\authoraddress{\email{amk@amk.ca}}
-
-\begin{document}
-\maketitle
-\tableofcontents
-
-\copyright{Copyright 2002 A.M. Kuchling.
-      Permission is granted to copy, distribute and/or modify this document
-      under the terms of the GNU Free Documentation License, Version 1.1
-      or any later version published by the Free Software Foundation;
-      with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
-      A copy of the license is included in the appendix entitled ``GNU
-      Free Documentation License''.}
-
-\input{introduction}
-\input{prog-zodb}
-\input{zeo}
-\input{transactions}
-\input{modules}
-
-\appendix
-\input links.tex
-\input gfdl.tex
-
-\end{document}

branches/pycon-multidb/log.ini

-# This file configures the logging module for the test harness:
-# critical errors are logged to testing.log; everything else is
-# ignored.
-
-# Documentation for the file format is at
-# http://www.red-dove.com/python_logging.html#config
-
-[logger_root]
-level=CRITICAL
-handlers=normal
-
-[handler_normal]
-class=FileHandler
-level=NOTSET
-formatter=common
-args=('testing.log', 'a')
-filename=testing.log
-mode=a
-
-[formatter_common]
-format=------
-       %(asctime)s %(levelname)s %(name)s %(message)s
-datefmt=%Y-%m-%dT%H:%M:%S
-
-[loggers]
-keys=root
-
-[handlers]
-keys=normal
-
-[formatters]
-keys=common

branches/pycon-multidb/releases/ZODB3/DEPENDENCIES.cfg

-ZEO
-ZODB
-# Needed because...?
-Persistence
-ZopeUndo

branches/pycon-multidb/releases/ZODB3/PACKAGE.cfg

-<load>
-  doc           svn://svn.zope.org/repos/main/ZODB/tags/*/doc/
-  scripts       svn://svn.zope.org/repos/main/ZODB/tags/*/src/scripts/
-  log.ini       svn://svn.zope.org/repos/main/ZODB/tags/*/log.ini
-  test.py       svn://svn.zope.org/repos/main/ZODB/tags/*/test.py
-  COPYRIGHT.txt svn://svn.zope.org/repos/main/ZODB/tags/*/COPYRIGHT.txt
-  LICENSE.txt   svn://svn.zope.org/repos/main/ZODB/tags/*/LICENSE.txt
-  NEWS.txt      svn://svn.zope.org/repos/main/ZODB/tags/*/NEWS.txt
-  README.txt    svn://svn.zope.org/repos/main/ZODB/tags/*/README.txt
-</load>
-
-<distribution>
-  doc
-  log.ini
-  test.py
-  COPYRIGHT.txt
-  LICENSE.txt
-  NEWS.txt
-  README.txt
-</distribution>
-
-<collection>
-  doc           -
-</collection>

branches/pycon-multidb/releases/ZODB3/PUBLICATION.cfg

-Metadata-version: 1.1
-Name: ZODB3
-License: ZPL 2.1
-Home-page: http://www.zope.org/Wikis/ZODB
-Summary: Zope Object Database: object database and persistence
-Description:
-        The Zope Object Database provides an object-oriented database
-        for Python that provides a high-degree of transparency.
-        Applications can take advantage of object database features
-        with few, if any, changes to application logic.  ZODB includes
-        features such as a plugable storage interface, rich
-        transaction support, and undo.
-Maintainer: ZODB Developers
-Maintainer-email: zodb-dev@zope.org
-Platform: any
-Classifier: Development Status :: 5 - Production/Stable
-Classifier: Intended Audience :: Developers
-Classifier: License :: OSI Approved :: Zope Public License
-Classifier: Programming Language :: Python
-Classifier: Topic :: Database
-Classifier: Topic :: Software Development :: Libraries :: Python Modules
-Classifier: Operating System :: Microsoft :: Windows
-Classifier: Operating System :: Unix

branches/pycon-multidb/src/BTrees/DEPENDENCIES.cfg

-persistent
-transaction

branches/pycon-multidb/src/BTrees/__init__.py

-# This is a Python package.

branches/pycon-multidb/src/BTrees/tests/__init__.py

-# If tests is a package, debugging is a bit easier.

branches/pycon-multidb/src/Persistence/DEPENDENCIES.cfg

-ZODB
-persistent