PythonDatabases

""" Example of sqlalchemy with sqlite """
from sqlalchemy import create_engine, Column, Integer, String, Enum
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
 
engine = create_engine('sqlite:///:memory:', echo=True)
 
Base = declarative_base()
 
 
class User(Base):
    """ Table connected to a class """
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    name = Column(String(255))
    fullname = Column(String(255))
    password = Column(String(50))
    state = Column(Enum('Tentative', 'Active', 'Inactive', 'Removed'))
 
    def __init__(self, name, fullname, password):
        self.name = name
        self.fullname = fullname
        self.password = password
        self.state = 'Tentative'
 
    def __repr__(self):
        return "User(%s, %s)" % (self.name, self.fullname)
 
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
session = Session()
 
u = User("me", "myself", "w00t")
v = User("jane", "Janet", "puppy")
session.add(u)
session.add(v)
session.flush()  # needed to allow u.id and v.id to be filled
# session.commit() is heavier
i1 = u.id
i2 = v.id
print "New record ids", i1, i2
n = u.name
print "New record ids", n
 
v.password = "mypuppy"
session.merge(v)
 
# session.close() is not needed
 
# sqlautocode.py
#   -o model.py
#   -u postgres://postgres:user@password/MyDatabase
#   -s myschema
#   -t Person*,Download