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import time
#import sqlalchemy.orm.attributes as attributes
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.test import *
"""
we are testing session.expunge() here, also that the attributes and unitofwork
packages dont keep dereferenced stuff hanging around.
for best results, dont run with sqlite :memory: database, and keep an eye on
top while it runs
"""
NUM = 2500
class LoadTest(TestBase, AssertsExecutionResults):
@classmethod
def setup_class(cls):
global items, meta
meta = MetaData(testing.db)
items = Table('items', meta,
Column('item_id', Integer, primary_key=True),
Column('value', String(100)))
items.create()
@classmethod
def teardown_class(cls):
items.drop()
def setup(self):
for x in range(1,NUM/500+1):
l = []
for y in range(x*500-500 + 1, x*500 + 1):
l.append({'item_id':y, 'value':'this is item #%d' % y})
items.insert().execute(*l)
def testload(self):
class Item(object):pass
m = mapper(Item, items)
sess = create_session()
now = time.time()
query = sess.query(Item)
for x in range (1,NUM/100):
# this is not needed with cpython which clears non-circular refs immediately
#gc_collect()
l = query.filter(items.c.item_id.between(x*100 - 100 + 1, x*100)).all()
assert len(l) == 100
print "loaded ", len(l), " items "
# modifying each object will ensure that the objects get placed in the "dirty" list
# and will hang around until expunged
#for a in l:
# a.value = 'changed...'
#assert len(objectstore.get_session().dirty) == len(l)
#assert len(objectstore.get_session().identity_map) == len(l)
#assert len(attributes.managed_attributes) == len(l)
#print len(objectstore.get_session().dirty)
#print len(objectstore.get_session().identity_map)
#objectstore.expunge(*l)
total = time.time() -now
print "total time ", total
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