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sqlalchemy orm with sqlite demo - Python 2.x
Python and SQL databases example from a Well House Consultants training course
More on Python and SQL databases [link]

This example is described in the following article(s):
   • example of SQLite using a local database file through SQLalchemy - [link]

Source code: orm_sqlite Module: Y113
# sqlalchemy orm with sqlite demo - Python 2.x

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String
from sqlalchemy.orm import sessionmaker
import sys
import os.path

# are we setting up a new database?

database = "stations.db"
populated = os.path.exists(database)

# Handle command line paramaters

echomode = False
for param in sys.argv:
        if param == '-v':
                echomode = True
        if param == '-r':
                populated = False
        if param == '-h':
                print ("Usage: " + __file__ + " [-h] [-r] [-v]")

# connect to the engine (will create empty file if need be

engine = create_engine('sqlite:///'+database, echo=echomode)
Base = declarative_base()

# define a table and create if need be

class Station(Base):
     __tablename__ = 'stations'
     id = Column(Integer, primary_key=True)
     name = Column(String)
     tlc = Column(String)
     postcode = Column(String)
     footfall = Column(Integer)

     def __repr__(self):
        return "Station (code='%s', postcode='%s', footfall='%d', fullname='%s')" % (
                             self.tlc, self.postcode, self.footfall,


# create a session

Session = sessionmaker(bind=engine)
session = Session()

# populate the table from a data file if it's new of if the "-r" flag was specified

if not populated:
        for line in open(""):
                f = line.strip().split('\t')
                        place = Station(name=f[6], tlc=f[1], postcode=f[2], footfall=int(f[-1]))
                if not echomode: print f[1],

# single query

localplace = session.query(Station).filter_by(tlc='MKM').first()
print (localplace)

# multiple query

for instance in session.query(Station).order_by(Station.footfall)[:30]:
   print (instance.tlc, instance.footfall,
Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Python
 * Python Programming
Also available on on site courses for larger groups

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Other Examples
This example comes from our "Python and SQL databases" training module. You'll find a description of the topic and some other closely related examples on the "Python and SQL databases" module index page.

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