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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