mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-25 10:01:26 -04:00
Mike Bayer
1e278de4cc
Applied on top of a pure run of black -l 79 in I7eda77fed3d8e73df84b3651fd6cfcfe858d4dc9, this set of changes resolves all remaining flake8 conditions for those codes we have enabled in setup.cfg. Included are resolutions for all remaining flake8 issues including shadowed builtins, long lines, import order, unused imports, duplicate imports, and docstring issues. Change-Id: I4f72d3ba1380dd601610ff80b8fb06a2aff8b0fe
1008 lines
27 KiB
Python
1008 lines
27 KiB
Python
import decimal
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import gc
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import itertools
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import multiprocessing
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import weakref
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import sqlalchemy as sa
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from sqlalchemy import ForeignKey
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from sqlalchemy import Integer
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from sqlalchemy import MetaData
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from sqlalchemy import select
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from sqlalchemy import String
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from sqlalchemy import testing
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from sqlalchemy import Unicode
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from sqlalchemy import util
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from sqlalchemy.orm import aliased
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from sqlalchemy.orm import clear_mappers
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from sqlalchemy.orm import create_session
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from sqlalchemy.orm import mapper
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from sqlalchemy.orm import relationship
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from sqlalchemy.orm import Session
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from sqlalchemy.orm import sessionmaker
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from sqlalchemy.orm import subqueryload
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from sqlalchemy.orm.mapper import _mapper_registry
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from sqlalchemy.orm.session import _sessions
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from sqlalchemy.processors import to_decimal_processor_factory
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from sqlalchemy.processors import to_unicode_processor_factory
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from sqlalchemy.sql import column
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from sqlalchemy.testing import engines
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from sqlalchemy.testing import eq_
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from sqlalchemy.testing import fixtures
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from sqlalchemy.testing.schema import Column
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from sqlalchemy.testing.schema import Table
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from sqlalchemy.testing.util import gc_collect
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class A(fixtures.ComparableEntity):
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pass
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class B(fixtures.ComparableEntity):
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pass
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class ASub(A):
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pass
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def profile_memory(
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maxtimes=250, assert_no_sessions=True, get_num_objects=None
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):
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def decorate(func):
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# run the test N times. if length of gc.get_objects()
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# keeps growing, assert false
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def get_objects_skipping_sqlite_issue():
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# pysqlite keeps adding weakref objects which only
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# get reset after 220 iterations. We'd like to keep these
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# tests under 50 iterations and ideally about ten, so
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# just filter them out so that we get a "flatline" more quickly.
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if testing.against("sqlite+pysqlite"):
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return [
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o
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for o in gc.get_objects()
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if not isinstance(o, weakref.ref)
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]
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else:
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return gc.get_objects()
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def profile(queue, func_args):
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# give testing.db a brand new pool and don't
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# touch the existing pool, since closing a socket
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# in the subprocess can affect the parent
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testing.db.pool = testing.db.pool.recreate()
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gc_collect()
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samples = []
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max_ = 0
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max_grew_for = 0
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success = False
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until_maxtimes = 0
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while True:
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if until_maxtimes >= maxtimes // 5:
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break
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for x in range(5):
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func(*func_args)
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gc_collect()
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samples.append(
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get_num_objects()
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if get_num_objects is not None
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else len(get_objects_skipping_sqlite_issue())
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)
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if assert_no_sessions:
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assert len(_sessions) == 0
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# queue.put(('samples', samples))
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latest_max = max(samples[-5:])
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if latest_max > max_:
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queue.put(
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(
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"status",
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"Max grew from %s to %s, max has "
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"grown for %s samples"
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% (max_, latest_max, max_grew_for),
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)
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)
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max_ = latest_max
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max_grew_for += 1
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until_maxtimes += 1
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continue
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else:
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queue.put(
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(
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"status",
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"Max remained at %s, %s more attempts left"
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% (max_, max_grew_for),
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)
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)
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max_grew_for -= 1
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if max_grew_for == 0:
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success = True
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break
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if not success:
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queue.put(
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(
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"result",
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False,
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"Ran for a total of %d times, memory kept "
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"growing: %r" % (maxtimes, samples),
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)
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)
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else:
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queue.put(("result", True, "success"))
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def run_in_process(*func_args):
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queue = multiprocessing.Queue()
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proc = multiprocessing.Process(
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target=profile, args=(queue, func_args)
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)
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proc.start()
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while True:
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row = queue.get()
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typ = row[0]
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if typ == "samples":
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print("sample gc sizes:", row[1])
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elif typ == "status":
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print(row[1])
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elif typ == "result":
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break
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else:
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assert False, "can't parse row"
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proc.join()
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assert row[1], row[2]
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return run_in_process
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return decorate
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def assert_no_mappers():
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clear_mappers()
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gc_collect()
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assert len(_mapper_registry) == 0
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class EnsureZeroed(fixtures.ORMTest):
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def setup(self):
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_sessions.clear()
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_mapper_registry.clear()
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self.engine = engines.testing_engine(options={"use_reaper": False})
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class MemUsageTest(EnsureZeroed):
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__tags__ = ("memory_intensive",)
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__requires__ = ("cpython",)
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def test_type_compile(self):
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from sqlalchemy.dialects.sqlite.base import dialect as SQLiteDialect
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cast = sa.cast(column("x"), sa.Integer)
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@profile_memory()
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def go():
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dialect = SQLiteDialect()
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cast.compile(dialect=dialect)
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go()
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@testing.requires.cextensions
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def test_DecimalResultProcessor_init(self):
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@profile_memory()
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def go():
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to_decimal_processor_factory({}, 10)
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go()
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@testing.requires.cextensions
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def test_DecimalResultProcessor_process(self):
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@profile_memory()
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def go():
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to_decimal_processor_factory(decimal.Decimal, 10)(1.2)
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go()
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@testing.requires.cextensions
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def test_UnicodeResultProcessor_init(self):
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@profile_memory()
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def go():
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to_unicode_processor_factory("utf8")
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go()
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def test_ad_hoc_types(self):
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"""test storage of bind processors, result processors
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in dialect-wide registry."""
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from sqlalchemy.dialects import mysql, postgresql, sqlite
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from sqlalchemy import types
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eng = engines.testing_engine()
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for args in (
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(types.Integer,),
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(types.String,),
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(types.PickleType,),
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(types.Enum, "a", "b", "c"),
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(sqlite.DATETIME,),
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(postgresql.ENUM, "a", "b", "c"),
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(types.Interval,),
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(postgresql.INTERVAL,),
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(mysql.VARCHAR,),
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):
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@profile_memory()
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def go():
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type_ = args[0](*args[1:])
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bp = type_._cached_bind_processor(eng.dialect)
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rp = type_._cached_result_processor(eng.dialect, 0)
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bp, rp # strong reference
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go()
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assert not eng.dialect._type_memos
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@testing.fails()
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def test_fixture_failure(self):
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class Foo(object):
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pass
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stuff = []
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@profile_memory(maxtimes=20)
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def go():
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stuff.extend(Foo() for i in range(100))
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go()
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class MemUsageWBackendTest(EnsureZeroed):
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__tags__ = ("memory_intensive",)
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__requires__ = "cpython", "memory_process_intensive"
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__backend__ = True
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# ensure a pure growing test trips the assertion
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@testing.fails_if(lambda: True)
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def test_fixture(self):
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class Foo(object):
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pass
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x = []
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@profile_memory(maxtimes=10)
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def go():
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x[-1:] = [Foo(), Foo(), Foo(), Foo(), Foo(), Foo()]
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go()
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def test_session(self):
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metadata = MetaData(self.engine)
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table1 = Table(
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"mytable",
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metadata,
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Column(
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"col1",
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Integer,
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primary_key=True,
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test_needs_autoincrement=True,
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),
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Column("col2", String(30)),
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)
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table2 = Table(
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"mytable2",
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metadata,
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Column(
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"col1",
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Integer,
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primary_key=True,
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test_needs_autoincrement=True,
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),
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Column("col2", String(30)),
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Column("col3", Integer, ForeignKey("mytable.col1")),
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)
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metadata.create_all()
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m1 = mapper(
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A,
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table1,
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properties={
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"bs": relationship(
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B, cascade="all, delete", order_by=table2.c.col1
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)
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},
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)
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m2 = mapper(B, table2)
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m3 = mapper(A, table1, non_primary=True)
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@profile_memory()
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def go():
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sess = create_session()
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a1 = A(col2="a1")
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a2 = A(col2="a2")
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a3 = A(col2="a3")
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a1.bs.append(B(col2="b1"))
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a1.bs.append(B(col2="b2"))
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a3.bs.append(B(col2="b3"))
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for x in [a1, a2, a3]:
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sess.add(x)
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sess.flush()
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sess.expunge_all()
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alist = sess.query(A).order_by(A.col1).all()
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eq_(
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[
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A(col2="a1", bs=[B(col2="b1"), B(col2="b2")]),
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A(col2="a2", bs=[]),
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A(col2="a3", bs=[B(col2="b3")]),
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],
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alist,
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)
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for a in alist:
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sess.delete(a)
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sess.flush()
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go()
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metadata.drop_all()
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del m1, m2, m3
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assert_no_mappers()
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def test_sessionmaker(self):
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@profile_memory()
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def go():
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sessmaker = sessionmaker(bind=self.engine)
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sess = sessmaker()
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r = sess.execute(select([1]))
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r.close()
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sess.close()
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del sess
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del sessmaker
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go()
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@testing.emits_warning("Compiled statement cache for mapper.*")
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@testing.emits_warning("Compiled statement cache for lazy loader.*")
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@testing.crashes("sqlite", ":memory: connection not suitable here")
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def test_orm_many_engines(self):
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metadata = MetaData(self.engine)
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table1 = Table(
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"mytable",
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metadata,
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Column(
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"col1",
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Integer,
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primary_key=True,
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test_needs_autoincrement=True,
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),
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Column("col2", String(30)),
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)
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table2 = Table(
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"mytable2",
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metadata,
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Column(
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"col1",
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Integer,
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primary_key=True,
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test_needs_autoincrement=True,
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),
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Column("col2", String(30)),
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Column("col3", Integer, ForeignKey("mytable.col1")),
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)
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metadata.create_all()
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m1 = mapper(
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A,
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table1,
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properties={
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"bs": relationship(
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B, cascade="all, delete", order_by=table2.c.col1
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)
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},
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_compiled_cache_size=50,
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)
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m2 = mapper(B, table2, _compiled_cache_size=50)
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m3 = mapper(A, table1, non_primary=True)
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@profile_memory()
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def go():
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engine = engines.testing_engine(
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options={
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"logging_name": "FOO",
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"pool_logging_name": "BAR",
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"use_reaper": False,
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}
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)
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sess = create_session(bind=engine)
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a1 = A(col2="a1")
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a2 = A(col2="a2")
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a3 = A(col2="a3")
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a1.bs.append(B(col2="b1"))
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a1.bs.append(B(col2="b2"))
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a3.bs.append(B(col2="b3"))
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for x in [a1, a2, a3]:
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sess.add(x)
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sess.flush()
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sess.expunge_all()
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alist = sess.query(A).order_by(A.col1).all()
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eq_(
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[
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A(col2="a1", bs=[B(col2="b1"), B(col2="b2")]),
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A(col2="a2", bs=[]),
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A(col2="a3", bs=[B(col2="b3")]),
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],
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alist,
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)
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for a in alist:
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sess.delete(a)
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sess.flush()
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sess.close()
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engine.dispose()
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go()
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metadata.drop_all()
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del m1, m2, m3
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assert_no_mappers()
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@testing.emits_warning("Compiled statement cache for.*")
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def test_many_updates(self):
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metadata = MetaData(self.engine)
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wide_table = Table(
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"t",
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metadata,
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Column(
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"id", Integer, primary_key=True, test_needs_autoincrement=True
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),
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*[Column("col%d" % i, Integer) for i in range(10)]
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)
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class Wide(object):
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pass
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mapper(Wide, wide_table, _compiled_cache_size=10)
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metadata.create_all()
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session = create_session()
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w1 = Wide()
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session.add(w1)
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session.flush()
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session.close()
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del session
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counter = [1]
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@profile_memory()
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def go():
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session = create_session()
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w1 = session.query(Wide).first()
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x = counter[0]
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dec = 10
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while dec > 0:
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# trying to count in binary here,
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# works enough to trip the test case
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if pow(2, dec) < x:
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setattr(w1, "col%d" % dec, counter[0])
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x -= pow(2, dec)
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dec -= 1
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session.flush()
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session.close()
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counter[0] += 1
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try:
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go()
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finally:
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metadata.drop_all()
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@testing.requires.savepoints
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@testing.provide_metadata
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def test_savepoints(self):
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metadata = self.metadata
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some_table = Table(
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"t",
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metadata,
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Column(
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"id", Integer, primary_key=True, test_needs_autoincrement=True
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),
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)
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class SomeClass(object):
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pass
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mapper(SomeClass, some_table)
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metadata.create_all()
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session = Session(testing.db)
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target_strings = (
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session.connection().dialect.identifier_preparer._strings
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)
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session.close()
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@profile_memory(
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assert_no_sessions=False,
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get_num_objects=lambda: len(target_strings),
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)
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def go():
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session = Session(testing.db)
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with session.transaction:
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sc = SomeClass()
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session.add(sc)
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with session.begin_nested():
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session.query(SomeClass).first()
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go()
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@testing.crashes("mysql+cymysql", "blocking")
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def test_unicode_warnings(self):
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metadata = MetaData(self.engine)
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table1 = Table(
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"mytable",
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metadata,
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Column(
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"col1",
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Integer,
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primary_key=True,
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test_needs_autoincrement=True,
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),
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Column("col2", Unicode(30)),
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)
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metadata.create_all()
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i = [1]
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# the times here is cranked way up so that we can see
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# pysqlite clearing out its internal buffer and allow
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# the test to pass
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@testing.emits_warning()
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@profile_memory()
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def go():
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# execute with a non-unicode object. a warning is emitted,
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# this warning shouldn't clog up memory.
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self.engine.execute(
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table1.select().where(table1.c.col2 == "foo%d" % i[0])
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)
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i[0] += 1
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try:
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go()
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finally:
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|
metadata.drop_all()
|
|
|
|
def test_warnings_util(self):
|
|
counter = itertools.count()
|
|
import warnings
|
|
|
|
warnings.filterwarnings("ignore", "memusage warning.*")
|
|
|
|
@profile_memory()
|
|
def go():
|
|
util.warn_limited(
|
|
"memusage warning, param1: %s, param2: %s",
|
|
(next(counter), next(counter)),
|
|
)
|
|
|
|
go()
|
|
|
|
def test_mapper_reset(self):
|
|
metadata = MetaData(self.engine)
|
|
|
|
table1 = Table(
|
|
"mytable",
|
|
metadata,
|
|
Column(
|
|
"col1",
|
|
Integer,
|
|
primary_key=True,
|
|
test_needs_autoincrement=True,
|
|
),
|
|
Column("col2", String(30)),
|
|
)
|
|
|
|
table2 = Table(
|
|
"mytable2",
|
|
metadata,
|
|
Column(
|
|
"col1",
|
|
Integer,
|
|
primary_key=True,
|
|
test_needs_autoincrement=True,
|
|
),
|
|
Column("col2", String(30)),
|
|
Column("col3", Integer, ForeignKey("mytable.col1")),
|
|
)
|
|
|
|
@profile_memory()
|
|
def go():
|
|
mapper(
|
|
A,
|
|
table1,
|
|
properties={"bs": relationship(B, order_by=table2.c.col1)},
|
|
)
|
|
mapper(B, table2)
|
|
|
|
mapper(A, table1, non_primary=True)
|
|
|
|
sess = create_session()
|
|
a1 = A(col2="a1")
|
|
a2 = A(col2="a2")
|
|
a3 = A(col2="a3")
|
|
a1.bs.append(B(col2="b1"))
|
|
a1.bs.append(B(col2="b2"))
|
|
a3.bs.append(B(col2="b3"))
|
|
for x in [a1, a2, a3]:
|
|
sess.add(x)
|
|
sess.flush()
|
|
sess.expunge_all()
|
|
|
|
alist = sess.query(A).order_by(A.col1).all()
|
|
eq_(
|
|
[
|
|
A(col2="a1", bs=[B(col2="b1"), B(col2="b2")]),
|
|
A(col2="a2", bs=[]),
|
|
A(col2="a3", bs=[B(col2="b3")]),
|
|
],
|
|
alist,
|
|
)
|
|
|
|
for a in alist:
|
|
sess.delete(a)
|
|
sess.flush()
|
|
sess.close()
|
|
clear_mappers()
|
|
|
|
metadata.create_all()
|
|
try:
|
|
go()
|
|
finally:
|
|
metadata.drop_all()
|
|
assert_no_mappers()
|
|
|
|
def test_alias_pathing(self):
|
|
metadata = MetaData(self.engine)
|
|
|
|
a = Table(
|
|
"a",
|
|
metadata,
|
|
Column(
|
|
"id", Integer, primary_key=True, test_needs_autoincrement=True
|
|
),
|
|
Column("bid", Integer, ForeignKey("b.id")),
|
|
Column("type", String(30)),
|
|
)
|
|
|
|
asub = Table(
|
|
"asub",
|
|
metadata,
|
|
Column("id", Integer, ForeignKey("a.id"), primary_key=True),
|
|
Column("data", String(30)),
|
|
)
|
|
|
|
b = Table(
|
|
"b",
|
|
metadata,
|
|
Column(
|
|
"id", Integer, primary_key=True, test_needs_autoincrement=True
|
|
),
|
|
)
|
|
mapper(A, a, polymorphic_identity="a", polymorphic_on=a.c.type)
|
|
mapper(ASub, asub, inherits=A, polymorphic_identity="asub")
|
|
mapper(B, b, properties={"as_": relationship(A)})
|
|
|
|
metadata.create_all()
|
|
sess = Session()
|
|
a1 = ASub(data="a1")
|
|
a2 = ASub(data="a2")
|
|
a3 = ASub(data="a3")
|
|
b1 = B(as_=[a1, a2, a3])
|
|
sess.add(b1)
|
|
sess.commit()
|
|
del sess
|
|
|
|
# sqlite has a slow enough growth here
|
|
# that we have to run it more times to see the
|
|
# "dip" again
|
|
@profile_memory(maxtimes=120)
|
|
def go():
|
|
sess = Session()
|
|
sess.query(B).options(subqueryload(B.as_.of_type(ASub))).all()
|
|
sess.close()
|
|
|
|
try:
|
|
go()
|
|
finally:
|
|
metadata.drop_all()
|
|
clear_mappers()
|
|
|
|
def test_path_registry(self):
|
|
metadata = MetaData()
|
|
a = Table(
|
|
"a",
|
|
metadata,
|
|
Column("id", Integer, primary_key=True),
|
|
Column("foo", Integer),
|
|
Column("bar", Integer),
|
|
)
|
|
m1 = mapper(A, a)
|
|
|
|
@profile_memory()
|
|
def go():
|
|
ma = sa.inspect(aliased(A))
|
|
m1._path_registry[m1.attrs.foo][ma][m1.attrs.bar]
|
|
|
|
go()
|
|
clear_mappers()
|
|
|
|
def test_with_inheritance(self):
|
|
metadata = MetaData(self.engine)
|
|
|
|
table1 = Table(
|
|
"mytable",
|
|
metadata,
|
|
Column(
|
|
"col1",
|
|
Integer,
|
|
primary_key=True,
|
|
test_needs_autoincrement=True,
|
|
),
|
|
Column("col2", String(30)),
|
|
)
|
|
|
|
table2 = Table(
|
|
"mytable2",
|
|
metadata,
|
|
Column(
|
|
"col1",
|
|
Integer,
|
|
ForeignKey("mytable.col1"),
|
|
primary_key=True,
|
|
test_needs_autoincrement=True,
|
|
),
|
|
Column("col3", String(30)),
|
|
)
|
|
|
|
@profile_memory()
|
|
def go():
|
|
class A(fixtures.ComparableEntity):
|
|
pass
|
|
|
|
class B(A):
|
|
pass
|
|
|
|
mapper(
|
|
A,
|
|
table1,
|
|
polymorphic_on=table1.c.col2,
|
|
polymorphic_identity="a",
|
|
)
|
|
mapper(B, table2, inherits=A, polymorphic_identity="b")
|
|
|
|
sess = create_session()
|
|
a1 = A()
|
|
a2 = A()
|
|
b1 = B(col3="b1")
|
|
b2 = B(col3="b2")
|
|
for x in [a1, a2, b1, b2]:
|
|
sess.add(x)
|
|
sess.flush()
|
|
sess.expunge_all()
|
|
|
|
alist = sess.query(A).order_by(A.col1).all()
|
|
eq_([A(), A(), B(col3="b1"), B(col3="b2")], alist)
|
|
|
|
for a in alist:
|
|
sess.delete(a)
|
|
sess.flush()
|
|
|
|
# don't need to clear_mappers()
|
|
del B
|
|
del A
|
|
|
|
metadata.create_all()
|
|
try:
|
|
go()
|
|
finally:
|
|
metadata.drop_all()
|
|
assert_no_mappers()
|
|
|
|
def test_with_manytomany(self):
|
|
metadata = MetaData(self.engine)
|
|
|
|
table1 = Table(
|
|
"mytable",
|
|
metadata,
|
|
Column(
|
|
"col1",
|
|
Integer,
|
|
primary_key=True,
|
|
test_needs_autoincrement=True,
|
|
),
|
|
Column("col2", String(30)),
|
|
)
|
|
|
|
table2 = Table(
|
|
"mytable2",
|
|
metadata,
|
|
Column(
|
|
"col1",
|
|
Integer,
|
|
primary_key=True,
|
|
test_needs_autoincrement=True,
|
|
),
|
|
Column("col2", String(30)),
|
|
)
|
|
|
|
table3 = Table(
|
|
"t1tot2",
|
|
metadata,
|
|
Column("t1", Integer, ForeignKey("mytable.col1")),
|
|
Column("t2", Integer, ForeignKey("mytable2.col1")),
|
|
)
|
|
|
|
@profile_memory()
|
|
def go():
|
|
class A(fixtures.ComparableEntity):
|
|
pass
|
|
|
|
class B(fixtures.ComparableEntity):
|
|
pass
|
|
|
|
mapper(
|
|
A,
|
|
table1,
|
|
properties={
|
|
"bs": relationship(
|
|
B, secondary=table3, backref="as", order_by=table3.c.t1
|
|
)
|
|
},
|
|
)
|
|
mapper(B, table2)
|
|
|
|
sess = create_session()
|
|
a1 = A(col2="a1")
|
|
a2 = A(col2="a2")
|
|
b1 = B(col2="b1")
|
|
b2 = B(col2="b2")
|
|
a1.bs.append(b1)
|
|
a2.bs.append(b2)
|
|
for x in [a1, a2]:
|
|
sess.add(x)
|
|
sess.flush()
|
|
sess.expunge_all()
|
|
|
|
alist = sess.query(A).order_by(A.col1).all()
|
|
eq_([A(bs=[B(col2="b1")]), A(bs=[B(col2="b2")])], alist)
|
|
|
|
for a in alist:
|
|
sess.delete(a)
|
|
sess.flush()
|
|
|
|
# don't need to clear_mappers()
|
|
del B
|
|
del A
|
|
|
|
metadata.create_all()
|
|
try:
|
|
go()
|
|
finally:
|
|
metadata.drop_all()
|
|
assert_no_mappers()
|
|
|
|
@testing.provide_metadata
|
|
def test_key_fallback_result(self):
|
|
e = self.engine
|
|
m = self.metadata
|
|
t = Table("t", m, Column("x", Integer), Column("y", Integer))
|
|
m.create_all(e)
|
|
e.execute(t.insert(), {"x": 1, "y": 1})
|
|
|
|
@profile_memory()
|
|
def go():
|
|
r = e.execute(t.alias().select())
|
|
for row in r:
|
|
row[t.c.x]
|
|
|
|
go()
|
|
|
|
def test_many_discarded_relationships(self):
|
|
"""a use case that really isn't supported, nonetheless we can
|
|
guard against memleaks here so why not"""
|
|
|
|
m1 = MetaData()
|
|
t1 = Table("t1", m1, Column("id", Integer, primary_key=True))
|
|
t2 = Table(
|
|
"t2",
|
|
m1,
|
|
Column("id", Integer, primary_key=True),
|
|
Column("t1id", ForeignKey("t1.id")),
|
|
)
|
|
|
|
class T1(object):
|
|
pass
|
|
|
|
t1_mapper = mapper(T1, t1)
|
|
|
|
@testing.emits_warning()
|
|
@profile_memory()
|
|
def go():
|
|
class T2(object):
|
|
pass
|
|
|
|
t2_mapper = mapper(T2, t2)
|
|
t1_mapper.add_property("bar", relationship(t2_mapper))
|
|
s1 = Session()
|
|
# this causes the path_registry to be invoked
|
|
s1.query(t1_mapper)._compile_context()
|
|
|
|
go()
|
|
|
|
# fails on newer versions of pysqlite due to unusual memory behvior
|
|
# in pysqlite itself. background at:
|
|
# http://thread.gmane.org/gmane.comp.python.db.pysqlite.user/2290
|
|
|
|
@testing.crashes("mysql+cymysql", "blocking")
|
|
def test_join_cache(self):
|
|
metadata = MetaData(self.engine)
|
|
table1 = Table(
|
|
"table1",
|
|
metadata,
|
|
Column(
|
|
"id", Integer, primary_key=True, test_needs_autoincrement=True
|
|
),
|
|
Column("data", String(30)),
|
|
)
|
|
table2 = Table(
|
|
"table2",
|
|
metadata,
|
|
Column(
|
|
"id", Integer, primary_key=True, test_needs_autoincrement=True
|
|
),
|
|
Column("data", String(30)),
|
|
Column("t1id", Integer, ForeignKey("table1.id")),
|
|
)
|
|
|
|
class Foo(object):
|
|
pass
|
|
|
|
class Bar(object):
|
|
pass
|
|
|
|
mapper(
|
|
Foo, table1, properties={"bars": relationship(mapper(Bar, table2))}
|
|
)
|
|
metadata.create_all()
|
|
session = sessionmaker()
|
|
|
|
@profile_memory()
|
|
def go():
|
|
s = table2.select()
|
|
sess = session()
|
|
sess.query(Foo).join((s, Foo.bars)).all()
|
|
sess.rollback()
|
|
|
|
try:
|
|
go()
|
|
finally:
|
|
metadata.drop_all()
|