Take the 2-minute tour ×

I have a class mapped with a table, in my case in a declarative way, and I want to "discover" table properties, columns, names, relations, from this class:

engine = create_engine('sqlite:///' + databasePath, echo=True)

# setting up root class for declarative declaration
Base = declarative_base(bind=engine)

class Ship(Base):
    __tablename__ = 'ships'

    id = Column(Integer, primary_key=True)
    name = Column(String(255))

    def __init__(self, name):
            self.name = name

    def __repr__(self):
            return "<Ship('%s')>" % (self.name)

So now my goal is from the "Ship" class to get the table columns and their properties from another piece of code. I guess I can deal with it using instrumentation but is there any way provided by the SQLAlchemy API?

share|improve this question
See also the related question at stackoverflow.com/q/2537471/25507 –  Josh Kelley Dec 20 '10 at 4:09
add comment

1 Answer

up vote 21 down vote accepted

Information you need you can get from Table object:

  • Ship.__table__.columns will provide you with columns information
  • Ship.__table__.foreign_keys will list foreign keys
  • Ship.__table__.constraints, Ship.__table__.indexes are other properties you might find useful
share|improve this answer
thank you for your answer –  ssaboum Mar 16 '10 at 7:54
add comment

Your Answer


