[python] How can I select all rows with sqlalchemy?

I am trying to get all rows from a table.

In controller I have:

meta.Session.query(User).all()

The result is [, ], but I have 2 rows in this table.

I use this model for the table:

import hashlib
import sqlalchemy as sa
from sqlalchemy import orm

from allsun.model import meta

t_user =  sa.Table("users",meta.metadata,autoload=True)

class Duplicat(Exception):
    pass
class LoginExistsException(Exception):
    pass
class EmailExistsException(Exception):
    pass

And next, in the same file:

class User(object):
    def loginExists(self):
        try:
            meta.Session
                .query(User)
                .filter(User.login==self.login)
                .one()
        except orm.exc.NoResultFound:
            pass
        else:
            raise LoginExistsException()

    def emailExists(self):
        try:
            meta
                .Session
                .query(User)
                .filter(User.email==self.email)
                .one()
        except orm.exc.NoResultFound:
            pass
        else:
            raise EmailExistsException()


    def save(self):
        meta.Session.begin()
        meta.Session.save(self)
        try:
            meta.Session.commit()
        except sa.exc.IntegrityError:
            raise Duplicat()

orm.mapper(User, t_user)

You can easily import your model and run this:

from models import User

# User is the name of table that has a column name
users = User.query.all()

for user in users:
    print user.name

I use the following snippet to view all the rows in a table. Use a query to find all the rows. The returned objects are the class instances. They can be used to view/edit the values as required:

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine, Sequence
from sqlalchemy import String, Integer, Float, Boolean, Column
from sqlalchemy.orm import sessionmaker

Base = declarative_base()

class MyTable(Base):
    __tablename__ = 'MyTable'
    id = Column(Integer, Sequence('user_id_seq'), primary_key=True)
    some_col = Column(String(500))

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

engine = create_engine('sqlite:///sqllight.db', echo=True)
Session = sessionmaker(bind=engine)
session = Session()

for class_instance in session.query(MyTable).all():
    print(vars(class_instance))

session.close()