Sprinting

The BoulderSprint is a regular activity of the FrontRangePythoneers. We plan to hold these sprints on a monthly basis in 2007.

For more information about sprints in general, read the SprintIntroduction page. SteveHolden has a useful [http://www.onlamp.com/pub/a/python/2006/10/19/running-a-sprint.html article] in the [http://www.onlamp.com/python/ OnLamp Python DevCenter ] on how to run a sprint.

Jython Sprint

Date/time

• January 6, 2007 (Saturday), 9 AM - 6 PM

Location

[http://www.bivio.biz/ bivio Software, Inc.], 28th and Iris. Above Hair Elite in Suite S. [http://maps.google.com/maps?f=q&hl=en&q=2701+Iris+Ave.,+Boulder+CO&ie=UTF8&z=15&om=1&iwloc=A Google Maps link]

Project

Update Jython. [http://wiki.python.org/jython/MovingJythonForward Brian Zimmer's proposal] is an useful outline of what needs to be done technically. Perhaps even more importantly, there are some key engineering challenges to be addressed to ensure overall project success. Because of the scope of the work, we are looking at this as preliminary to [http://us.pycon.org/TX2007/Sprints a 4-day sprint at PyCon]. More here at JythonSprint.

Participants

The following have indicated an interest, let's see if we can all make the proposed date:

1. Eric Dobbs
2. Bill Simons
3. Matt Boersma
4. Kip Lehman
5. Jim Baker

Please add yourself here!

Previous Sprints

Django-Oracle Project

November 4, 2006 (Saturday), 9 AM - 6 PM

Complete support for Oracle in Django in time for 1.0. Suggested by Matt Boersma.

Specifically, we would like to build on the good work already done by the Django community to produce a single patch that can be applied to current subversion sources, enabling Django's ORM to pass basic tests against an Oracle database. The current patches available have Oracle-specific conditional tests in many locations; we will try to confine such code to the django.db.backends.oracle package.

References

The bug report stipulating Oracle support by Django version 1.0 is here: http://code.djangoproject.com/ticket/1990

Preliminary Tasks

(Many of these are refinements and performance improvements that we won't get to, since we're focused only on correct behavior right now. But several of us reviewed the code and didn't want to lose any feedback. After the sprint, we will enter the outstanding issues in [http://code.djangoproject.com/newticket the Django project Trac].)

• Use ROWNUM, not LIMIT 1. Oracle guru Tom Kyte addresses this in a recent [http://www.oracle.com/technology/oramag/oracle/06-sep/o56asktom.html article] in Oracle magazine. It boils down to using a doubly nested subquery.

• Create LOB columns out-of-line
• Need a way to explicitly specify TABLESPACE for table creation
• (Done) CREATE [SEQUENCE|CONSTRAINTS] gets logged twice
• (Done) backend creates LONG columns, should use CLOBs instead
• (Done) backend may create two LONG columns, but Oracle allows one per table (don't use LONG columns... solved by using CLOBs)
• In "syncdb", foreign keys should be created as a second pass after table creation, using ALTER statements. Otherwise the DDL will reference tables not yet created, and Oracle throws errors.

• (Done) Primary key "id" column (AutoField) is NUMBER(38) in creation.py. Does it need to be that large? No it doesn't.

• "syncdb" should always create indexes for foreign key columns, or Oracle will optimize poorly
• "syncdb" doesn't check for table existence before running table creation SQL?

• (Done--as is) FormatStylePlaceholderCursor object: is it needed? We thought cx_Oracle already did named params...

• fulltext search isn't supported
• Use INSTR instead of costly LIKE for the endswith construct (LIKE %s) ?
• (Partially done) get_indexes() and get_relations() unimplemented. Use USER_CONSTRAINTS and USER_INDEXES from Oracle.

• (Done) SlugField, PhoneNumberField, etc., use VARCHAR and CHAR, but all should use VARCHAR2 consistently.

• TimeField should use "INTERVAL DAY TO SECOND" datatype

• (Done) NullBooleanField should be NUMBER(1) like BooleanField, not NUMBER(38)

• (Done) Don't use Oracle's non-native Integer and SmallInteger types, which result in a NUMBER(38).

• XmlField unimplemented, although Oracle now has native support for this.

• In db/models/base.py, should use COUNT(*) instead of Oracle LIMIT 1 conditional test
• Create a function-based index on lower() columns, or else check if DB is Oracle 10g
• move query.py oracle tests out to the db module
• Which versions of Oracle do we need to support? (9i and 10g, hopefully, although old versions of cx_Oracle still support 8i)

• Good comment from Winston Lee: "I think the biggest issue is the restriction of only one LONG field type on a table. This means that NCLOB will need to be used for TextField? in creation.py. cx_Oracle will then return NCLOB field as a cx_Oracle.LOB. I thought that it would be possible to use cx_Oracle.Connection.register to hook into the return and read the LOB object but it should really be a lazy fetch."

• Add more Monty Python references to the code.

Participants

1. Jim Baker
2. Matt Boersma, Aries, the man with the plan
3. Eric Dobbs
4. Ian Kelly, Pisces, he who shall do all the work
5. Matt Drew, Capricorn, master pizza orderer
6. Michelle Cyr, Cancer, senior ice cream fetcher
7. Jacob Kaplan-Moss, lead Django developer!
8. Malcolm Tredinnick (working remotely from Sydney -- with the flu, no less!)
9. Mitchell W. Smith, Virgo, schwag coordinator

Post Sprint Party

Some of us are planning to go to the [http://www.bouldercuba.org/ Cuban Connection fundraiser], 6 PM - 1 AM, St. Julien Hotel (our favorite meeting place for FrontRangePythoneers). In addition to raising money for a good cause, this will be a chance to stretch our weary coding muscles while dancing salsa to Quemando and Havana NRG.

Photo Stream

• Nov 4, 2006 [http://www.flickr.com/search/?w=all&q=bouldersprint Photos]