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import sqlalchemy as sa
from sqlalchemy.test import engines, testing
from sqlalchemy import Integer, String, ForeignKey, literal_column, orm, exc
from sqlalchemy.test.schema import Table, Column
from sqlalchemy.orm import mapper, relationship, create_session, column_property, sessionmaker
from sqlalchemy.test.testing import eq_, ne_, assert_raises, assert_raises_message
from test.orm import _base, _fixtures
from test.engine import _base as engine_base
_uuids =['1fc614acbb904742a2990f86af6ded95', '23e253786f4d491b9f9d6189dc33de9b', 'fc44910db37e43fd93e9ec8165b885cf',
'0187a1832b4249e6b48911821d86de58', '778af6ea2fb74a009d8d2f5abe5dc29a', '51a6ce031aff47e4b5f2895c4161f120',
'7434097cd319401fb9f15fa443ccbbbb', '9bc548a8128e4a85ac18060bc3f4b7d3', '59548715e3c440b7bcb96417d06f7930',
'd7647c7004734de196885ca2bd73adf8', '70cef121d3ff48d39906b6d1ac77f41a', 'ee37a8a6430c466aa322b8a215a0dd70',
'782a5f04b4364a53a6fce762f48921c1', 'bef510f2420f4476a7629013ead237f5']
def make_uuid():
"""generate uuids even on Python 2.4 which has no 'uuid'"""
return _uuids.pop(0)
class VersioningTest(_base.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table('version_table', metadata,
Column('id', Integer, primary_key=True,
test_needs_autoincrement=True),
Column('version_id', Integer, nullable=False),
Column('value', String(40), nullable=False))
@classmethod
def setup_classes(cls):
class Foo(_base.ComparableEntity):
pass
@engines.close_open_connections
@testing.resolve_artifact_names
def test_notsane_warning(self):
# clear the warning module's ignores to force the SAWarning this
# test relies on to be emitted (it may have already been ignored
# forever by other VersioningTests)
try:
del __warningregistry__
except NameError:
pass
save = testing.db.dialect.supports_sane_rowcount
testing.db.dialect.supports_sane_rowcount = False
try:
mapper(Foo, version_table,
version_id_col=version_table.c.version_id)
s1 = create_session(autocommit=False)
f1 = Foo(value='f1')
f2 = Foo(value='f2')
s1.add_all((f1, f2))
s1.commit()
f1.value='f1rev2'
assert_raises(sa.exc.SAWarning, s1.commit)
finally:
testing.db.dialect.supports_sane_rowcount = save
@testing.emits_warning(r'.*does not support updated rowcount')
@engines.close_open_connections
@testing.resolve_artifact_names
def test_basic(self):
mapper(Foo, version_table,
version_id_col=version_table.c.version_id)
s1 = create_session(autocommit=False)
f1 = Foo(value='f1')
f2 = Foo(value='f2')
s1.add_all((f1, f2))
s1.commit()
f1.value='f1rev2'
s1.commit()
s2 = create_session(autocommit=False)
f1_s = s2.query(Foo).get(f1.id)
f1_s.value='f1rev3'
s2.commit()
f1.value='f1rev3mine'
# Only dialects with a sane rowcount can detect the
# ConcurrentModificationError
if testing.db.dialect.supports_sane_rowcount:
assert_raises(sa.orm.exc.ConcurrentModificationError, s1.commit)
s1.rollback()
else:
s1.commit()
# new in 0.5 ! dont need to close the session
f1 = s1.query(Foo).get(f1.id)
f2 = s1.query(Foo).get(f2.id)
f1_s.value='f1rev4'
s2.commit()
s1.delete(f1)
s1.delete(f2)
if testing.db.dialect.supports_sane_rowcount:
assert_raises(sa.orm.exc.ConcurrentModificationError, s1.commit)
else:
s1.commit()
@testing.emits_warning(r'.*does not support updated rowcount')
@engines.close_open_connections
@testing.resolve_artifact_names
def test_versioncheck(self):
"""query.with_lockmode performs a 'version check' on an already loaded instance"""
s1 = create_session(autocommit=False)
mapper(Foo, version_table, version_id_col=version_table.c.version_id)
f1s1 = Foo(value='f1 value')
s1.add(f1s1)
s1.commit()
s2 = create_session(autocommit=False)
f1s2 = s2.query(Foo).get(f1s1.id)
f1s2.value='f1 new value'
s2.commit()
# load, version is wrong
assert_raises(
sa.orm.exc.ConcurrentModificationError,
s1.query(Foo).with_lockmode('read').get, f1s1.id
)
# reload it - this expires the old version first
s1.refresh(f1s1, lockmode='read')
# now assert version OK
s1.query(Foo).with_lockmode('read').get(f1s1.id)
# assert brand new load is OK too
s1.close()
s1.query(Foo).with_lockmode('read').get(f1s1.id)
@testing.emits_warning(r'.*does not support updated rowcount')
@engines.close_open_connections
@testing.requires.update_nowait
@testing.resolve_artifact_names
def test_versioncheck_for_update(self):
"""query.with_lockmode performs a 'version check' on an already loaded instance"""
s1 = create_session(autocommit=False)
mapper(Foo, version_table, version_id_col=version_table.c.version_id)
f1s1 = Foo(value='f1 value')
s1.add(f1s1)
s1.commit()
s2 = create_session(autocommit=False)
f1s2 = s2.query(Foo).get(f1s1.id)
s2.refresh(f1s2, lockmode='update')
f1s2.value='f1 new value'
assert_raises(
exc.DBAPIError,
s1.refresh, f1s1, lockmode='update_nowait'
)
s1.rollback()
s2.commit()
s1.refresh(f1s1, lockmode='update_nowait')
assert f1s1.version_id == f1s2.version_id
@testing.emits_warning(r'.*does not support updated rowcount')
@engines.close_open_connections
@testing.resolve_artifact_names
def test_noversioncheck(self):
"""test query.with_lockmode works when the mapper has no version id col"""
s1 = create_session(autocommit=False)
mapper(Foo, version_table)
f1s1 = Foo(value="foo", version_id=0)
s1.add(f1s1)
s1.commit()
s2 = create_session(autocommit=False)
f1s2 = s2.query(Foo).with_lockmode('read').get(f1s1.id)
assert f1s2.id == f1s1.id
assert f1s2.value == f1s1.value
class RowSwitchTest(_base.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table('p', metadata,
Column('id', String(10), primary_key=True),
Column('version_id', Integer, default=1, nullable=False),
Column('data', String(50))
)
Table('c', metadata,
Column('id', String(10), ForeignKey('p.id'), primary_key=True),
Column('version_id', Integer, default=1, nullable=False),
Column('data', String(50))
)
@classmethod
def setup_classes(cls):
class P(_base.ComparableEntity):
pass
class C(_base.ComparableEntity):
pass
@classmethod
@testing.resolve_artifact_names
def setup_mappers(cls):
mapper(P, p, version_id_col=p.c.version_id,
properties={
'c':relationship(C, uselist=False, cascade='all, delete-orphan')
})
mapper(C, c, version_id_col=c.c.version_id)
@testing.resolve_artifact_names
def test_row_switch(self):
session = sessionmaker()()
session.add(P(id='P1', data='P version 1'))
session.commit()
session.close()
p = session.query(P).first()
session.delete(p)
session.add(P(id='P1', data="really a row-switch"))
session.commit()
@testing.resolve_artifact_names
def test_child_row_switch(self):
assert P.c.property.strategy.use_get
session = sessionmaker()()
session.add(P(id=1, data='P version 1'))
session.commit()
session.close()
p = session.query(P).first()
p.c = C(data='child version 1')
session.commit()
p = session.query(P).first()
p.c = C(data='child row-switch')
session.commit()
class AlternateGeneratorTest(_base.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table('p', metadata,
Column('id', String(10), primary_key=True),
Column('version_id', String(32), nullable=False),
Column('data', String(50))
)
Table('c', metadata,
Column('id', String(10), ForeignKey('p.id'), primary_key=True),
Column('version_id', String(32), nullable=False),
Column('data', String(50))
)
@classmethod
def setup_classes(cls):
class P(_base.ComparableEntity):
pass
class C(_base.ComparableEntity):
pass
@classmethod
@testing.resolve_artifact_names
def setup_mappers(cls):
mapper(P, p, version_id_col=p.c.version_id,
version_id_generator=lambda x:make_uuid(),
properties={
'c':relationship(C, uselist=False, cascade='all, delete-orphan')
})
mapper(C, c, version_id_col=c.c.version_id,
version_id_generator=lambda x:make_uuid(),
)
@testing.resolve_artifact_names
def test_row_switch(self):
session = sessionmaker()()
session.add(P(id='P1', data='P version 1'))
session.commit()
session.close()
p = session.query(P).first()
session.delete(p)
session.add(P(id='P1', data="really a row-switch"))
session.commit()
@testing.resolve_artifact_names
def test_child_row_switch_one(self):
assert P.c.property.strategy.use_get
session = sessionmaker()()
session.add(P(id=1, data='P version 1'))
session.commit()
session.close()
p = session.query(P).first()
p.c = C(data='child version 1')
session.commit()
p = session.query(P).first()
p.c = C(data='child row-switch')
session.commit()
@testing.resolve_artifact_names
def test_child_row_switch_two(self):
Session = sessionmaker()
sess1 = Session()
sess1.add(P(id=1, data='P version 1'))
sess1.commit()
sess1.close()
p1 = sess1.query(P).first()
sess2 = Session()
p2 = sess2.query(P).first()
sess1.delete(p1)
sess1.commit()
sess1.add(P(id='P1', data='P version 2'))
sess1.commit()
p2.data = 'P overwritten by concurrent tx'
assert_raises(
orm.exc.ConcurrentModificationError,
sess2.commit
)
|
