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import time, resource
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.testing import *
from sqlalchemy.testing.util import gc_collect
NUM = 100
metadata = MetaData(testing.db)
Person_table = Table('Person', metadata,
Column('id', Integer, primary_key=True),
Column('name', String(40)),
Column('sex', Integer),
Column('age', Integer))
Email_table = Table('Email', metadata,
Column('id', Integer, primary_key=True),
Column('person_id', Integer, ForeignKey('Person.id')),
Column('address', String(300)))
class Person(object):
pass
class Email(object):
def __repr__(self):
return '<email %s %s>' % (getattr(self, 'id', None),
getattr(self, 'address', None))
mapper(Person, Person_table, properties={
'emails': relationship(Email, backref='owner', lazy='joined')
})
mapper(Email, Email_table)
compile_mappers()
def setup():
metadata.create_all()
i = Person_table.insert()
data = [{'name':'John Doe','sex':1,'age':35}] * NUM
i.execute(data)
i = Email_table.insert()
for j in xrange(1, NUM + 1):
i.execute(address='foo@bar', person_id=j)
if j % 2:
i.execute(address='baz@quux', person_id=j)
print "Inserted %d rows." % (NUM + NUM + (NUM // 2))
def orm_select(session):
return session.query(Person).all()
@profiling.profiled('update_and_flush')
def update_and_flush(session, people):
for p in people:
p.name = 'Exene Cervenka'
p.sex = 2
p.emails[0].address = 'hoho@lala'
session.flush()
def all():
setup()
try:
t, t2 = 0, 0
def usage(label):
now = resource.getrusage(resource.RUSAGE_SELF)
print "%s: %0.3fs real, %0.3fs user, %0.3fs sys" % (
label, t2 - t,
now.ru_utime - usage.last.ru_utime,
now.ru_stime - usage.last.ru_stime)
usage.snap(now)
usage.snap = lambda stats=None: setattr(
usage, 'last', stats or resource.getrusage(resource.RUSAGE_SELF))
session = create_session()
gc_collect()
usage.snap()
t = time.clock()
people = orm_select(session)
t2 = time.clock()
usage('load objects')
gc_collect()
usage.snap()
t = time.clock()
update_and_flush(session, people)
t2 = time.clock()
usage('update and flush')
finally:
metadata.drop_all()
if __name__ == '__main__':
all()
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