Mike Bayer [Mon, 26 Apr 2010 04:20:57 +0000 (00:20 -0400)]
illustrate the basic idea of add_xxx(strings), whereby Table/Column/Constraint objects
are just generated in order to produce the DDL. I'm not entirely
thrilled with this - would be nicer if we could get sqlalchemy.schema constructs
to generate with strings alone - but this would change their signatures. so we're sort
of doing that here anyway.