you're missing:
session.add(b)
On Nov 13, 2010, at 7:11 AM, STefano wrote:
> import os
> from sqlalchemy import types
> from sqlalchemy import create_engine, Column, Integer, String,
> ForeignKey
> from sqlalchemy.orm import sessionmaker, scoped_session
> from sqlalchemy import create_engine
>
> from sqlalchemy.ext.declarative import declarative_base
>
>
> class MyType(types.TypeDecorator):
> '''Copied from sa docs
> '''
> impl = types.Unicode
>
> def process_bind_param(self, value, dialect):
> print "...process_bind_param"
> return "PREFIX:" + value
>
> def process_result_value(self, value, dialect):
> print "...process_result_value"
> return value
> # return value[7:]
>
> def copy(self):
> print "...copy"
> return MyType(self.impl.length)
>
>
> Base = declarative_base()
>
>
> class TestBase(Base):
> __tablename__ = "testbase"
>
> id = Column("id", types.Integer, primary_key=True)
> file = Column("file", MyType, nullable = False )
>
> if __name__ == '__main__':
>
> engine = create_engine('sqlite://', echo=False)
> Base.metadata.create_all(engine)
>
> session = sessionmaker(engine)()
>
> b = TestBase(file=u"value")
> session.commit()
> print b.file
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