==========================================
ZODB - a native object database for Python
==========================================

Because ZODB is an object database:

- no separate language for database operations

- very little impact on your code to make objects persistent

- no database mapper that partially hides the database.

  Using an object-relational mapping **is not** like using an object database.

- almost no seam between code and database.

- Relationships between objects are handled very naturally, supporting
  complex object graphs without joins.

Check out the :doc:`tutorial`!

ZODB runs on Python 2.7 or Python 3.4 and above. It also runs on PyPy.

Learning more
=============

.. toctree::
   :maxdepth: 1

   introduction
   tutorial
   guide/index
   articles/index
   ConflictResolution
   collaborations
   cross-database-references
   event
   historical_connections
   persistentclass
   utils
   developers
   changelog
   reference/index

* `The ZODB Book (in progress) <http://zodb.readthedocs.org/en/latest/>`_


What is the expansion of "ZODB"?
================================

The expansion of "ZODB" is the Z Object Database.  But, of course, we
usually just use "ZODB".

In the past, it was the Zope Object Database, because it was
developed as part of the Zope project.  But ZODB doesn't depend on
Zope in any way and is used in many projects that have nothing to do
with Zope.


Downloads
=========

ZODB is distributed through the `Python Package Index
<https://pypi.org/project/ZODB/>`_.

You can install the ZODB using pip command::

    $ pip install ZODB

Community and contributing
==========================

Discussion occurs on the `ZODB mailing list
<https://groups.google.com/forum/#!forum/zodb>`_. (And for the
transaction system on the `transaction list
<https://groups.google.com/forum/#!forum/python-transaction>`_)

Bug reporting and feature requests are submitted through github issue
trackers for various ZODB components:

- ZODB `repository <https://github.com/zopefoundation/zodb>`_

- persistent `documentation <https://persistent.readthedocs.io/en/stable/>`_ and its `repository <https://github.com/zopefoundation/persistent>`_.

- transaction `documentation <https://transaction.readthedocs.io/en/stable/>`_ and its `repository <https://github.com/zopefoundation/transaction>`_

- BTrees `documentation <https://btrees.readthedocs.io/en/stable/>`_ and their `repository <https://github.com/zopefoundation/BTrees>`_

- ZEO (client-server framework) `documentation <https://zeo.readthedocs.io/en/stable/>`_ and its `repository <https://github.com/zopefoundation/ZEO>`_

- relstorage `documentation <https://relstorage.readthedocs.io/en/latest/>`_ and its `repository <https://github.com/zodb/relstorage/>`_

- zodburi `documentation <https://docs.pylonsproject.org/projects/zodburi/en/latest/>`_ and its `repository <https://github.com/Pylons/zodburi>`_

- NEO `documentation <https://neo.nexedi.com/>`_ and its `repository <https://lab.nexedi.com/nexedi/neoppod/>`_

- readonlystorage `repository <https://gitlab.com/yaal/readonlystorage>`_

- newt db `documentation <https://newt-db.readthedocs.io/en/latest>`_ and its `repository <https://github.com/newtdb/db>`_

If you'd like to contribute then we'll gladly accept work on documentation,
helping out other developers and users at the mailing list, submitting bugs,
creating proposals and writing code.

ZODB is a project managed by the Zope Foundation so you can get write access
for contributing directly - check out the foundation's `Zope Developer Information <http://docs.zope.org/developer>`_.