Michael Bayer wrote:
On Mar 6, 2006, at 7:38 PM, Kapil Thangavelu wrote:
direction. it would need a table subclass and custom metaclass to get
around the existing singleton table metaclass.
Or you could have two SchemaEngine objects, a "current" and a "previous
version", one of which has the collection of current tables, the other
has the previous collection of tables. since table changes should be
compared at the full schema level (like SVN compares changesets).
i've been playing around with this and have generation of some kinds of
change objects. what would be the best way to generate the sql ddl for
these changesets? i'd like to take advantage of the sql generation and
abstraction capabilities already in sa.
i'm thinking some sort of AlterClause subclassed from ClauseElement, and
a Changeset that accepts a schema visitor to the contained alterclauses.
and then modify the schema generator to process them.
sound good?
fwiw, i'm heading to a conference for the rest of the week, and won't
have a chance to work on it till i come back.
kapil
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