[SQLObject] [PATCH] Specifying indexes

[Jeremy F. <je...@go...>]

My app relies on SQLObject to create its tables initially.  This has the
problem that there's no way to specify indexes for each table.

This patch (against SVN head) implements an Index() class which allows
you to add indexes.  Its use is pretty simple:

from sqlobject import *
class Foo(SQLObject):
	foo = IntCol()
	bar = StringCol()
	biff = IntCol()

	idx1 = Index(foo)	 	# simple index
	idx2 = Index(bar, unique=True)	# simple unique index
	idx3 = Index((biff, foo))	# multi-column index
	idx4 = Index(((biff, 4),))	# only the first 4 chars of biff are used

There are no operations which can be applied to Indexes; they're used
implicitly (one assumes) during queries.  The only time Index() has an
actual effect is during createTable.

I've only implemented support in the databases I have on hand: SQLite
and MySQL.  Adding createIndexSQL for the other database types should be
easy.

This is also the first time I've dug about SQLObject's innards, so I'm
not really sure if I've done things right.  The mapping from a Col to
SOCol via the name seems a bit tortured.

Does this look like an acceptable way of dealing with this problem?

	J