On 21.10.11 20:09, Michael Bayer wrote:
> Because not every DB supports this (such as MySQL), we have not yet
> implemented the feature of named column level constraints across the board
> yet. We'd have to either implement it only for those DBs which support it,
> or add exceptions to those which don't. The main job is a. figure out which
> backends support it, and b. write some tests.
>
> Here's a patch:
>
> http://www.sqlalchemy.org/trac/ticket/2305
>
> Table-level CHECK constraints do support generation of the "name" in all
> cases, however.
>
Thanks a lot, the patch works like charm
> On Oct 21, 2011, at 7:10 PM, Mariano Mara wrote:
>
> > Hi all,
> > the subject pretty much explains it all. Here's a complete example of the
> > issue. Any tips will be appreciate.
> >
> > Regards,
> > Mariano
> >
> > Python 2.7.2 (default, Oct 14 2011, 23:34:02)
> > [GCC 4.5.2] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.
> >>>> import sqlalchemy
> >>>> sqlalchemy.__version__
> > '0.7.3'
> >>>> from sqlalchemy import Table, Column, Integer, create_engine, MetaData,
> >>>> CheckConstraint
> >>>> from sqlalchemy.orm import sessionmaker
> >>>> session = sessionmaker()
> >>>> Session = session()
> >>>> engine = create_engine('postgresql://usr:passws@localhost/base',
> >>>> echo=True)
> >>>> Session.configure(bind=engine)
> >>>> md = MetaData()
> >>>> md.bind = engine
> >>>> t = Table("test_ck", md, Column("id", Integer, primary_key=True),
> > ... Column("id2", Integer, CheckConstraint("id2 between 1 and 10",
> > name="my_constraint")))
> >>>> md.create_all(engine)
> > 2011-10-21 19:53:45,523 INFO sqlalchemy.engine.base.Engine select version()
> > 2011-10-21 19:53:45,523 INFO sqlalchemy.engine.base.Engine {}
> > 2011-10-21 19:53:45,708 INFO sqlalchemy.engine.base.Engine select
> > current_schema()
> > 2011-10-21 19:53:45,709 INFO sqlalchemy.engine.base.Engine {}
> > 2011-10-21 19:53:45,804 INFO sqlalchemy.engine.base.Engine select relname
> > from pg_class c join pg_namespace n on n.oid=c.relnamespace where
> > n.nspname=current_schema() and relname=%(name)s
> > 2011-10-21 19:53:45,804 INFO sqlalchemy.engine.base.Engine {'name':
> > u'test_ck'}
> > 2011-10-21 19:53:46,168 INFO sqlalchemy.engine.base.Engine
> > CREATE TABLE test_ck (
> > id SERIAL NOT NULL,
> > id2 INTEGER CHECK (id2 between 1 and 10),
> > PRIMARY KEY (id)
> > )
> >
> >
> > 2011-10-21 19:53:46,168 INFO sqlalchemy.engine.base.Engine {}
> > 2011-10-21 19:53:47,116 INFO sqlalchemy.engine.base.Engine COMMIT
> >>>>
> >
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