The Dejavu Object-Relational Mapper (version 1.2.6) is now available and in the public domain. Get it at svn://casadeamor.com/dejavu/trunk.
Dejavu is an Object-Relational Mapper for Python applications. It is designed to provide the "Model" third of an MVC application. Dejavu avoids making decisions in the framework which are better left to developers, and avoids forcing developers to make decisions which are better left to deployers. In particular, deployers are allowed to mix and match storage mechanisms, including how and when to cache objects in memory, making it easier for deployers to tune applications to their particular environment. Dejavu provides: MODELING LAYER 1. A subclassable Unit class for persisting objects to storage. 2. A base Unit Property class for declaring persistent object attributes. 3. ID Sequencers. 4. Associations between Unit classes. 5. Unit Engines, Rules, and Collections. 6. Aggregation and analysis tools. APPLICATION LAYER 1. Expressions: pure Python Unit queries. This is perhaps the most appealing feature of Dejavu. However, since it uses bytecode hacks, Dejavu only runs on CPython. 2. Sandboxes, which serve as Identity Maps and per-connection caches. Unit objects are "memorized" and "recalled" from a Sandbox, using Expressions. 3. An Arena class for application-level data. STORAGE LAYER 1. A subclassable StorageManager class and specification. Unlike many ORMs, Dejavu does not require you to have complete control of your back end. 2. Specific StorageManagers for: a. Microsoft SQL Server via ADO. b. Microsoft Access (Jet) via ADO. c. ODBC databases (not complete = broken) d. Shelve to dbm. e. Future versions of Dejavu will support PostgreSQL, MySQL, and SQLite. Others are being considered. Dejavu welcomes your use and feedback as an application developer. Dejavu also welcomes framework developers. New code for additional Storage Managers, analysis tools, will be gladly reviewed for inclusion in future releases. Drop me an email if you feel so inclined. Robert Brewer MIS Amor Ministries [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
