SQLAlchemy, clear database content but don't drop the schema

Question

I\'m developing a Pylons app which is based on exisitng database, so I\'m using reflection. I have an SQL file with the schema that I used to create my test database. That\'

Answer 1

For PostgreSQL using TRUNCATE:

with contextlib.closing(engine.connect()) as con:
    trans = con.begin()
    con.execute('TRUNCATE {} RESTART IDENTITY;'.format(
        ','.join(table.name 
                 for table in reversed(Base.metadata.sorted_tables))))
    trans.commit()

Note: RESTART IDENTITY; ensures that all sequences are reset as well. However, this is slower than the DELETE recipe by @aknuds1 by 50%.

Another recipe is to drop all tables first and then recreate them. This is slower by another 50%:

Base.metadata.drop_all(bind=engine)
Base.metadata.create_all(bind=engine)