custom DDL is most directly via the DDL() element:
http://www.sqlalchemy.org/docs/core/schema.html#sqlalchemy.schema.DDL
or if you want a more general use "EXCLUDE" construct that accepts arguments
and SQL expressions you can subclass DDLElement and build a compilation
function:
http://www.sqlalchemy.org/docs/core/compiler.html
DDL and DDLElement both support execution via table and metadata create/drop
events.
On Sep 23, 2010, at 6:22 PM, A.M. wrote:
> Hello,
>
> I am using this PostgreSQL exclusion constraint:
>
> CONSTRAINT only_one_valid EXCLUDE USING (synthetic_id WITH
> =,COALESCE(obsoleteby,'') WITH =),
>
> How can I represent this using SQLAlchemy Table metadata so that I can create
> the table from the metadata?
>
> Cheers,
> M
>
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