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from sqlalchemy.engine import default
from sqlalchemy.databases import *
from sqlalchemy.orm import mapper
from sqlalchemy.orm import Session
from sqlalchemy.testing import AssertsCompiledSQL, eq_
from sqlalchemy.testing import assert_raises_message
from sqlalchemy import exc
from test.orm import _fixtures
class LegacyLockModeTest(_fixtures.FixtureTest):
run_inserts = None
@classmethod
def setup_mappers(cls):
User, users = cls.classes.User, cls.tables.users
mapper(User, users)
def _assert_legacy(self, arg, read=False, nowait=False):
User = self.classes.User
s = Session()
q = s.query(User).with_lockmode(arg)
sel = q._compile_context().statement
if arg is None:
assert q._for_update_arg is None
assert sel._for_update_arg is None
return
assert q._for_update_arg.read is read
assert q._for_update_arg.nowait is nowait
assert sel._for_update_arg.read is read
assert sel._for_update_arg.nowait is nowait
def test_false_legacy(self):
self._assert_legacy(None)
def test_plain_legacy(self):
self._assert_legacy("update")
def test_nowait_legacy(self):
self._assert_legacy("update_nowait", nowait=True)
def test_read_legacy(self):
self._assert_legacy("read", read=True)
def test_unknown_legacy_lock_mode(self):
User = self.classes.User
sess = Session()
assert_raises_message(
exc.ArgumentError, "Unknown with_lockmode argument: 'unknown_mode'",
sess.query(User.id).with_lockmode, 'unknown_mode'
)
class ForUpdateTest(_fixtures.FixtureTest):
@classmethod
def setup_mappers(cls):
User, users = cls.classes.User, cls.tables.users
mapper(User, users)
def _assert(self, read=False, nowait=False, of=None,
assert_q_of=None, assert_sel_of=None):
User = self.classes.User
s = Session()
q = s.query(User).with_for_update(read=read, nowait=nowait, of=of)
sel = q._compile_context().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
eq_(q._for_update_arg.of, assert_q_of)
eq_(sel._for_update_arg.of, assert_sel_of)
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 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
mapper(User, users)
mapper(Address, addresses)
def test_default_update(self):
User = self.classes.User
sess = 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 = 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 = 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 = 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 = 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 = 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 = 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 = 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_update_of_list(self):
User = self.classes.User
sess = 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_oracle_update(self):
User = self.classes.User
sess = 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_mysql_read(self):
User = self.classes.User
sess = 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"
)
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