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A generic database adapter for Zope 2

Project description

A-like integration of SQLAlchemy based on z3c.sqlalchemy

What is SQLAlchemyDA?

SQLAlchemyDA is a generic database adapter for ZSQL methods. Since it is based on SQLAlchemy, SQLAlchemyDA supports all databases out-of-the box that are supported by SQLAlchemy (Postgres, MySQL, Oracle, SQLite, MS-SQL, Firebird, Informix).


  • Zope 2.10+
  • SQLAlchemy >= 0.5.0 (+ database specific low-level Python drivers)
  • z3c.sqlalchemy >= 1.2.0


  • download and install SQLAlchemy as egg or from the sources from Cheeseshop (easy_install sqlalchemy). See

    for details

  • download and install z3c.sqlalchemy as egg or from the sources from Cheeseshop (easy_install z3c.sqlalchemy). See

    for details.

  • unpack the archive containing SQLAlchemyDA inside the “Products” directory of your Zope instance home.

  • after restarting Zope you go to the ZMI and create an instance of “SQLAlchemyDA” (as you would create some DA instance)

  • click on the new created SQLAlchemyDA instance within the ZMI and configure your database connection through the “Properties” tab. The connection parameter ‘dsn’ must be specified as a valid SQLAlchemy DSN like




  • ZSQL methods should see the new DA through the selection widget of available database adapters

  • NOTE: you must have the low-level Python DB drivers installed in order to access a particular database. See

    for details.

Configuration of SQLAlchemyDA:

  • ‘dsn’ - SQLAlchemy compliant Database Set Name (see
  • ‘transactional’ - uncheck this property if you are working with a non-transactional
    database like older versions of MySQL. Uncheck this property only if you see any commit() related error. Otherwise leave this property checked. Changing this property requires a Zope restart.
  • ‘quoting_style’ - affects how strings are quoted in SQL. By default ‘standard’
    quotes strings correctly. Setting the value to ‘no-quote’ might solve quoting issues with some databases.

Using SQLAlchemyDA:

SQLAlchemyDA works as a database adapter as documented within “The Zope Book”

and can be used like any other DA together with ZSQL methods.

Tested with databases:

  • Postgres 7.4, 8.0-8.2
  • SQLite 3.3.X
  • Oracle 10g
  • MySQL is only supported for MySQL databases with transaction support. (see also z3c/sqlalchemy/README.txt)

Known issues:

“”” Database connection could not be opened ((ProgrammingError) (1064, You have an error in your SQL syntax near ‘COMMIT . “”“

This bug might appear with older MySQL versions when opening/closing the connections manually through the ZMI. It should not affect the functionality of SQLAlchemyDA.


SQLAlchemyDA was written by Andreas Jung for Haufe Mediengruppe, Freiburg, Germany and ZOPYX Ltd. & Co. KG, Tuebingen, Germany.


SQLAlchemyDA is licensed under the Zope Public License 2.1. See LICENSE.txt.


ZOPYX Ltd. & Co. KG
Andreas Jung
E-mail: info at zopyx dot com


Parts of the SQLAlchemyDA V 0.3.X development has been sponsored by Wayne Volkmuth (


0.5.1 (2010-08-05)

  • fixed typo in type mapping

0.5.0 (2010-05-07)

  • Fixed LP #570208
  • Added a method ‘add_extra_engine_options’ to set additional engine options for SQLAlchemy.create_engine.
  • Removed SOFTWARE_HOME dependency
  • Requires SQLALchemy >= 0.5.0

0.4.1 (2008-06-01)

  • fixed issue with version.txt file

0.4.0 (2008-01-24)

  • requires z3c.sqlalchemy (2.0.0 or higher)
  • requires SQLAlchemy 0.4.4 or higer

0.3.0 (2007-06-10)

  • fixed some security assertions
  • added “Test” tab for executing SQL queries directly
  • better error handling for ZMI screens
  • no longer depending on a pre-registered SQLAlchemy wrapper. SQLAlchemyDA now accepts (as any other DA) a DSN as property ‘dsn’
  • DSN can be passed through the add form
  • redirect directly to “Info” tab after creating an instance through the ZMI
  • catching some low-level exceptions from the sqlite interface in order to make it work with SQLite
  • new properties ‘transactional’ and ‘quoting_style’
  • improved support for Oracle and MySQL
  • SQLAlchemyDA no longer provides access to mapper related functionalities. It now acts as a DA for executing SQL statements only.
  • fixed unregistration code for a wrapper (hopefully works with Zope 2.8 or higher)
  • updated documentation

0.2.1 (2007-05-06)

  • connections can be closed/opened through the ZMI
  • some code cleanup
  • fixed a very stupid typo causing ZODB conflict errors

0.2.0 (2007-05-05)

  • first public release

0.1.0 (2007-04-30)

  • initial coding

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