ANN: Dejavu 1.5.0RC1

olive ocollioud at gmail.com
Thu Jan 25 19:10:38 CET 2007


Looks interesting...

Do you consider a StorageManagers for Oracle ?

Olive.

On Jan 24, 11:57 pm, "Robert Brewer" <fuman... at amor.org> wrote:
> The Dejavu Object-Relational Mapper (version 1.5.0RC1) is now available
> and in the public domain. Get it athttp://projects.amor.org/dejavu,
> or from PyPI:http://www.python.org/pypi/Dejavu/1.5.0RC1.
>
> 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 base Unit class for persisting objects to storage.
> 2. A base UnitProperty class for 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 lambda querying. This is perhaps the most
>    appealing feature of Dejavu.
> 2. Sandboxes, which serve as Identity Maps, transaction boundaries,
>    and per-connection caches.
> 3. An Arena class for application-level data.
>
> Storage Layer
> 1. A base StorageManager class and specification. Unlike many ORMs,
>    Dejavu does not require you to have complete control of the back end.
> 2. Specific StorageManagers for:
>    a. Microsoft SQL Server/MSDE
>    b. Microsoft Access (Jet)
>    c. PostgreSQL
>    d. MySQL
>    e. SQLite
>    f. Shelve
>    g. Firebird
>    h. RAM
>    i. Filesystem
>
> What's New in 1.5:http://projects.amor.org/dejavu/wiki/WhatsNewIn15
>
>  * Native ID sequencing.
>  * Distributed transactions and tested isolation levels.
>  * Complete database introspection and auto discovery.
>
>  * New Firebird support.
>  * New RAM Storage Manager.
>  * New psycopg2 support.
>  * New support for using the sqlite3 module built into Python 2.5.
>  * Support for typed and typeless SQLite.
>  * Support for SQLite :memory: databases.
>
>  * Complete numeric precision and scale support.
>  * Native date function support.
>  * Complete M x N type-adaptation.
>  * Bulletproof encoding support.
>  * New 'range' function which returns the closed interval [min(attr),
> ..., max(attr)].
>  * New 'sum' function which returns the sum of all non-None values for
> the given cls.attr.
>  * Multiple and custom Associations.
>  * Improved performance (especially ADO).
>  * New JSON encoder/decoder.
>  * Short config names for Storage Managers.
>  * ADO: New support for the CURRENCY datatype.
>  * ADO: Improved string comparisons using Convert and StrComp.
>
> Upgrading to 1.5:
> Seehttp://projects.amor.org/dejavu/wiki/UpgradeTo1.5
>
> Documentation for 1.5:http://projects.amor.org/docs/dejavu/1.5.0RC1/
>
> Robert Brewer
> System Architect
> Amor Ministries
> fuman... at amor.org




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