mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-06-01 05:18:44 -04:00
Mike Bayer
c6bceb7775
- converted all eager to joined in examples - fixed beaker/advanced.py to reference RelationshipCache
55 lines
1.5 KiB
Python
55 lines
1.5 KiB
Python
from sqlalchemy import *
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from sqlalchemy.orm import *
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from sqlalchemy.test import profiling
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NUM = 500
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DIVISOR = 50
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engine = create_engine('sqlite://')
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meta = MetaData(engine)
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items = Table('items', meta,
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Column('item_id', Integer, primary_key=True),
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Column('value', String(100)))
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subitems = Table('subitems', meta,
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Column('sub_id', Integer, primary_key=True),
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Column('parent_id', Integer, ForeignKey('items.item_id')),
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Column('value', String(100)))
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class Item(object):pass
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class SubItem(object):pass
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mapper(Item, items, properties={'subs':relationship(SubItem, lazy='joined')})
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mapper(SubItem, subitems)
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def load():
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global l
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l = []
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for x in range(1,NUM/DIVISOR + 1):
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l.append({'item_id':x, 'value':'this is item #%d' % x})
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#print l
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items.insert().execute(*l)
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for x in range(1, NUM/DIVISOR + 1):
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l = []
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for y in range(1, DIVISOR + 1):
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z = ((x-1) * DIVISOR) + y
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l.append({'sub_id':z,'value':'this is item #%d' % z, 'parent_id':x})
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#print l
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subitems.insert().execute(*l)
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@profiling.profiled('massjoinedload', always=True, sort=['cumulative'])
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def massjoinedload(session):
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session.begin()
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query = session.query(Item)
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l = query.all()
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print "loaded ", len(l), " items each with ", len(l[0].subs), "subitems"
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def all():
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meta.create_all()
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try:
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load()
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massjoinedload(create_session())
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finally:
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meta.drop_all()
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if __name__ == '__main__':
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all()
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