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from sqlalchemy import exc
from sqlalchemy import testing
from sqlalchemy.engine import default
from sqlalchemy.orm import joinedload
from sqlalchemy.orm import relationship
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import AssertsCompiledSQL
from sqlalchemy.testing import eq_
from sqlalchemy.testing.fixtures import fixture_session
from test.orm import _fixtures
class ForUpdateTest(_fixtures.FixtureTest):
@classmethod
def setup_mappers(cls):
User, users = cls.classes.User, cls.tables.users
cls.mapper_registry.map_imperatively(User, users)
def _assert(
self,
read=False,
nowait=False,
of=None,
key_share=None,
assert_q_of=None,
assert_sel_of=None,
):
User = self.classes.User
s = fixture_session()
q = s.query(User).with_for_update(
read=read, nowait=nowait, of=of, key_share=key_share
)
sel = q._compile_state().statement
assert q._for_update_arg.read is read
assert sel._for_update_arg.read is read
assert q._for_update_arg.nowait is nowait
assert sel._for_update_arg.nowait is nowait
assert q._for_update_arg.key_share is key_share
assert sel._for_update_arg.key_share is key_share
eq_(q._for_update_arg.of, assert_q_of)
eq_(sel._for_update_arg.of, assert_sel_of)
def test_key_share(self):
self._assert(key_share=True)
def test_read(self):
self._assert(read=True)
def test_plain(self):
self._assert()
def test_nowait(self):
self._assert(nowait=True)
def test_of_single_col(self):
User, users = self.classes.User, self.tables.users
self._assert(
of=User.id, assert_q_of=[users.c.id], assert_sel_of=[users.c.id]
)
class BackendTest(_fixtures.FixtureTest):
__backend__ = True
# test against the major backends. We are naming specific databases
# here rather than using requirements rules since the behavior of
# "FOR UPDATE" as well as "OF" is very specific to each DB, and we need
# to run the query differently based on backend.
@classmethod
def setup_mappers(cls):
User, users = cls.classes.User, cls.tables.users
Address, addresses = cls.classes.Address, cls.tables.addresses
cls.mapper_registry.map_imperatively(
User, users, properties={"addresses": relationship(Address)}
)
cls.mapper_registry.map_imperatively(Address, addresses)
def test_inner_joinedload_w_limit(self):
User = self.classes.User
sess = fixture_session()
q = (
sess.query(User)
.options(joinedload(User.addresses, innerjoin=True))
.with_for_update()
.limit(1)
)
if testing.against("oracle"):
assert_raises_message(exc.DatabaseError, "ORA-02014", q.all)
else:
q.all()
sess.close()
def test_inner_joinedload_wo_limit(self):
User = self.classes.User
sess = fixture_session()
sess.query(User).options(
joinedload(User.addresses, innerjoin=True)
).with_for_update().all()
sess.close()
def test_outer_joinedload_w_limit(self):
User = self.classes.User
sess = fixture_session()
q = sess.query(User).options(
joinedload(User.addresses, innerjoin=False)
)
if testing.against("postgresql"):
q = q.with_for_update(of=User)
else:
q = q.with_for_update()
q = q.limit(1)
if testing.against("oracle"):
assert_raises_message(exc.DatabaseError, "ORA-02014", q.all)
else:
q.all()
sess.close()
def test_outer_joinedload_wo_limit(self):
User = self.classes.User
sess = fixture_session()
q = sess.query(User).options(
joinedload(User.addresses, innerjoin=False)
)
if testing.against("postgresql"):
q = q.with_for_update(of=User)
else:
q = q.with_for_update()
q.all()
sess.close()
def test_join_w_subquery(self):
User = self.classes.User
Address = self.classes.Address
sess = fixture_session()
q1 = sess.query(User).with_for_update().subquery()
sess.query(q1).join(Address).all()
sess.close()
def test_plain(self):
User = self.classes.User
sess = fixture_session()
sess.query(User).with_for_update().all()
sess.close()
class CompileTest(_fixtures.FixtureTest, AssertsCompiledSQL):
"""run some compile tests, even though these are redundant."""
run_inserts = None
@classmethod
def setup_mappers(cls):
User, users = cls.classes.User, cls.tables.users
Address, addresses = cls.classes.Address, cls.tables.addresses
cls.mapper_registry.map_imperatively(
User, users, properties={"addresses": relationship(Address)}
)
cls.mapper_registry.map_imperatively(Address, addresses)
def test_default_update(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(),
"SELECT users.id AS users_id FROM users FOR UPDATE",
dialect=default.DefaultDialect(),
)
def test_not_supported_by_dialect_should_just_use_update(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(read=True),
"SELECT users.id AS users_id FROM users FOR UPDATE",
dialect=default.DefaultDialect(),
)
def test_postgres_read(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(read=True),
"SELECT users.id AS users_id FROM users FOR SHARE",
dialect="postgresql",
)
def test_postgres_read_nowait(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(read=True, nowait=True),
"SELECT users.id AS users_id FROM users FOR SHARE NOWAIT",
dialect="postgresql",
)
def test_postgres_update(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(),
"SELECT users.id AS users_id FROM users FOR UPDATE",
dialect="postgresql",
)
def test_postgres_update_of(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(of=User.id),
"SELECT users.id AS users_id FROM users FOR UPDATE OF users",
dialect="postgresql",
)
def test_postgres_update_of_entity(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(of=User),
"SELECT users.id AS users_id FROM users FOR UPDATE OF users",
dialect="postgresql",
)
def test_postgres_update_of_entity_list(self):
User = self.classes.User
Address = self.classes.Address
sess = fixture_session()
self.assert_compile(
sess.query(User.id, Address.id).with_for_update(
of=[User, Address]
),
"SELECT users.id AS users_id, addresses.id AS addresses_id "
"FROM users, addresses FOR UPDATE OF users, addresses",
dialect="postgresql",
)
def test_postgres_for_no_key_update(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(key_share=True),
"SELECT users.id AS users_id FROM users FOR NO KEY UPDATE",
dialect="postgresql",
)
def test_postgres_for_no_key_nowait_update(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(key_share=True, nowait=True),
"SELECT users.id AS users_id FROM users FOR NO KEY UPDATE NOWAIT",
dialect="postgresql",
)
def test_postgres_update_of_list(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(
of=[User.id, User.id, User.id]
),
"SELECT users.id AS users_id FROM users FOR UPDATE OF users",
dialect="postgresql",
)
def test_postgres_update_skip_locked(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(skip_locked=True),
"SELECT users.id AS users_id FROM users FOR UPDATE SKIP LOCKED",
dialect="postgresql",
)
def test_oracle_update(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(),
"SELECT users.id AS users_id FROM users FOR UPDATE",
dialect="oracle",
)
def test_oracle_update_skip_locked(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(skip_locked=True),
"SELECT users.id AS users_id FROM users FOR UPDATE SKIP LOCKED",
dialect="oracle",
)
def test_mysql_read(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User.id).with_for_update(read=True),
"SELECT users.id AS users_id FROM users LOCK IN SHARE MODE",
dialect="mysql",
)
def test_for_update_on_inner_w_joinedload(self):
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User)
.options(joinedload(User.addresses))
.with_for_update()
.limit(1),
"SELECT anon_1.users_id AS anon_1_users_id, anon_1.users_name "
"AS anon_1_users_name, addresses_1.id AS addresses_1_id, "
"addresses_1.user_id AS addresses_1_user_id, "
"addresses_1.email_address AS addresses_1_email_address "
"FROM (SELECT users.id AS users_id, users.name AS users_name "
"FROM users LIMIT %s FOR UPDATE) AS anon_1 "
"LEFT OUTER JOIN addresses AS addresses_1 "
"ON anon_1.users_id = addresses_1.user_id FOR UPDATE",
dialect="mysql",
)
def test_for_update_on_inner_w_joinedload_no_render_oracle(self):
from sqlalchemy.dialects import oracle
User = self.classes.User
sess = fixture_session()
self.assert_compile(
sess.query(User)
.options(joinedload(User.addresses))
.with_for_update()
.limit(1),
"SELECT anon_1.users_id AS anon_1_users_id, "
"anon_1.users_name AS anon_1_users_name, "
"addresses_1.id AS addresses_1_id, "
"addresses_1.user_id AS addresses_1_user_id, "
"addresses_1.email_address AS addresses_1_email_address "
"FROM (SELECT anon_2.users_id AS users_id, "
"anon_2.users_name AS users_name FROM "
"(SELECT users.id AS users_id, users.name AS users_name "
"FROM users) anon_2 WHERE ROWNUM <= "
"__[POSTCOMPILE_param_1]) anon_1 "
"LEFT OUTER JOIN addresses addresses_1 "
"ON anon_1.users_id = addresses_1.user_id FOR UPDATE",
dialect=oracle.dialect(enable_offset_fetch=False),
)
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