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#! coding:utf-8
from sqlalchemy import Integer, String, ForeignKey, delete, select, and_, \
or_
from sqlalchemy.dialects import mysql
from sqlalchemy import testing
from sqlalchemy.testing import AssertsCompiledSQL, fixtures, eq_
from sqlalchemy.testing.schema import Table, Column
class _DeleteTestBase(object):
@classmethod
def define_tables(cls, metadata):
Table('mytable', metadata,
Column('myid', Integer),
Column('name', String(30)),
Column('description', String(50)))
Table('myothertable', metadata,
Column('otherid', Integer),
Column('othername', String(30)))
class DeleteTest(_DeleteTestBase, fixtures.TablesTest, AssertsCompiledSQL):
__dialect__ = 'default'
def test_delete(self):
table1 = self.tables.mytable
self.assert_compile(
delete(table1, table1.c.myid == 7),
'DELETE FROM mytable WHERE mytable.myid = :myid_1')
self.assert_compile(
table1.delete().where(table1.c.myid == 7),
'DELETE FROM mytable WHERE mytable.myid = :myid_1')
self.assert_compile(
table1.delete().
where(table1.c.myid == 7).
where(table1.c.name == 'somename'),
'DELETE FROM mytable '
'WHERE mytable.myid = :myid_1 '
'AND mytable.name = :name_1')
def test_where_empty(self):
table1 = self.tables.mytable
self.assert_compile(
table1.delete().where(and_()),
"DELETE FROM mytable"
)
self.assert_compile(
table1.delete().where(or_()),
"DELETE FROM mytable"
)
def test_prefix_with(self):
table1 = self.tables.mytable
stmt = table1.delete().\
prefix_with('A', 'B', dialect='mysql').\
prefix_with('C', 'D')
self.assert_compile(stmt,
'DELETE C D FROM mytable')
self.assert_compile(stmt,
'DELETE A B C D FROM mytable',
dialect=mysql.dialect())
def test_alias(self):
table1 = self.tables.mytable
talias1 = table1.alias('t1')
stmt = delete(talias1).where(talias1.c.myid == 7)
self.assert_compile(
stmt,
'DELETE FROM mytable AS t1 WHERE t1.myid = :myid_1')
def test_correlated(self):
table1, table2 = self.tables.mytable, self.tables.myothertable
# test a non-correlated WHERE clause
s = select([table2.c.othername], table2.c.otherid == 7)
self.assert_compile(delete(table1, table1.c.name == s),
'DELETE FROM mytable '
'WHERE mytable.name = ('
'SELECT myothertable.othername '
'FROM myothertable '
'WHERE myothertable.otherid = :otherid_1'
')')
# test one that is actually correlated...
s = select([table2.c.othername], table2.c.otherid == table1.c.myid)
self.assert_compile(table1.delete(table1.c.name == s),
'DELETE FROM mytable '
'WHERE mytable.name = ('
'SELECT myothertable.othername '
'FROM myothertable '
'WHERE myothertable.otherid = mytable.myid'
')')
class DeleteFromRoundTripTest(fixtures.TablesTest):
__backend__ = True
@classmethod
def define_tables(cls, metadata):
Table('mytable', metadata,
Column('myid', Integer),
Column('name', String(30)),
Column('description', String(50)))
Table('myothertable', metadata,
Column('otherid', Integer),
Column('othername', String(30)))
Table('users', metadata,
Column('id', Integer, primary_key=True,
test_needs_autoincrement=True),
Column('name', String(30), nullable=False))
Table('addresses', metadata,
Column('id', Integer, primary_key=True,
test_needs_autoincrement=True),
Column('user_id', None, ForeignKey('users.id')),
Column('name', String(30), nullable=False),
Column('email_address', String(50), nullable=False))
Table('dingalings', metadata,
Column('id', Integer, primary_key=True,
test_needs_autoincrement=True),
Column('address_id', None, ForeignKey('addresses.id')),
Column('data', String(30)))
Table('update_w_default', metadata,
Column('id', Integer, primary_key=True),
Column('x', Integer),
Column('ycol', Integer, key='y'),
Column('data', String(30), onupdate=lambda: "hi"))
@classmethod
def fixtures(cls):
return dict(
users=(
('id', 'name'),
(7, 'jack'),
(8, 'ed'),
(9, 'fred'),
(10, 'chuck')
),
addresses=(
('id', 'user_id', 'name', 'email_address'),
(1, 7, 'x', 'jack@bean.com'),
(2, 8, 'x', 'ed@wood.com'),
(3, 8, 'x', 'ed@bettyboop.com'),
(4, 8, 'x', 'ed@lala.com'),
(5, 9, 'x', 'fred@fred.com')
),
dingalings=(
('id', 'address_id', 'data'),
(1, 2, 'ding 1/2'),
(2, 5, 'ding 2/5')
),
)
@testing.requires.delete_from
def test_exec_two_table(self):
users, addresses = self.tables.users, self.tables.addresses
dingalings = self.tables.dingalings
with testing.db.connect() as conn:
conn.execute(dingalings.delete()) # fk violation otherwise
conn.execute(
addresses.delete().
where(users.c.id == addresses.c.user_id).
where(users.c.name == 'ed')
)
expected = [
(1, 7, 'x', 'jack@bean.com'),
(5, 9, 'x', 'fred@fred.com')
]
self._assert_table(addresses, expected)
@testing.requires.delete_from
def test_exec_three_table(self):
users = self.tables.users
addresses = self.tables.addresses
dingalings = self.tables.dingalings
testing.db.execute(
dingalings.delete().
where(users.c.id == addresses.c.user_id).
where(users.c.name == 'ed').
where(addresses.c.id == dingalings.c.address_id))
expected = [
(2, 5, 'ding 2/5')
]
self._assert_table(dingalings, expected)
@testing.requires.delete_from
def test_exec_two_table_plus_alias(self):
users, addresses = self.tables.users, self.tables.addresses
dingalings = self.tables.dingalings
with testing.db.connect() as conn:
conn.execute(dingalings.delete()) # fk violation otherwise
a1 = addresses.alias()
conn.execute(
addresses.delete().
where(users.c.id == addresses.c.user_id).
where(users.c.name == 'ed').
where(a1.c.id == addresses.c.id)
)
expected = [
(1, 7, 'x', 'jack@bean.com'),
(5, 9, 'x', 'fred@fred.com')
]
self._assert_table(addresses, expected)
@testing.requires.delete_from
def test_exec_alias_plus_table(self):
users, addresses = self.tables.users, self.tables.addresses
dingalings = self.tables.dingalings
d1 = dingalings.alias()
testing.db.execute(
delete(d1).
where(users.c.id == addresses.c.user_id).
where(users.c.name == 'ed').
where(addresses.c.id == d1.c.address_id))
expected = [
(2, 5, 'ding 2/5')
]
self._assert_table(dingalings, expected)
def _assert_table(self, table, expected):
stmt = table.select().order_by(table.c.id)
eq_(testing.db.execute(stmt).fetchall(), expected)
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