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from sqlalchemy.testing import assert_raises, eq_
from sqlalchemy.testing import fixtures, AssertsCompiledSQL
from sqlalchemy import (
testing, exc, case, select, literal_column, text, and_, Integer, cast,
String, Column, Table, MetaData)
from sqlalchemy.sql import table, column
info_table = None
class CaseTest(fixtures.TestBase, AssertsCompiledSQL):
__dialect__ = 'default'
@classmethod
def setup_class(cls):
metadata = MetaData(testing.db)
global info_table
info_table = Table(
'infos', metadata,
Column('pk', Integer, primary_key=True),
Column('info', String(30)))
info_table.create()
info_table.insert().execute(
{'pk': 1, 'info': 'pk_1_data'},
{'pk': 2, 'info': 'pk_2_data'},
{'pk': 3, 'info': 'pk_3_data'},
{'pk': 4, 'info': 'pk_4_data'},
{'pk': 5, 'info': 'pk_5_data'},
{'pk': 6, 'info': 'pk_6_data'})
@classmethod
def teardown_class(cls):
info_table.drop()
@testing.fails_on('firebird', 'FIXME: unknown')
@testing.requires.subqueries
def test_case(self):
inner = select(
[
case(
[
[info_table.c.pk < 3, 'lessthan3'],
[
and_(info_table.c.pk >= 3, info_table.c.pk < 7),
'gt3']]).label('x'),
info_table.c.pk, info_table.c.info], from_obj=[info_table])
inner_result = inner.execute().fetchall()
# Outputs:
# lessthan3 1 pk_1_data
# lessthan3 2 pk_2_data
# gt3 3 pk_3_data
# gt3 4 pk_4_data
# gt3 5 pk_5_data
# gt3 6 pk_6_data
assert inner_result == [
('lessthan3', 1, 'pk_1_data'),
('lessthan3', 2, 'pk_2_data'),
('gt3', 3, 'pk_3_data'),
('gt3', 4, 'pk_4_data'),
('gt3', 5, 'pk_5_data'),
('gt3', 6, 'pk_6_data')
]
outer = select([inner.alias('q_inner')])
outer_result = outer.execute().fetchall()
assert outer_result == [
('lessthan3', 1, 'pk_1_data'),
('lessthan3', 2, 'pk_2_data'),
('gt3', 3, 'pk_3_data'),
('gt3', 4, 'pk_4_data'),
('gt3', 5, 'pk_5_data'),
('gt3', 6, 'pk_6_data')
]
w_else = select(
[
case(
[
[info_table.c.pk < 3, cast(3, Integer)],
[
and_(
info_table.c.pk >= 3, info_table.c.pk < 6),
6]],
else_=0).label('x'),
info_table.c.pk, info_table.c.info],
from_obj=[info_table])
else_result = w_else.execute().fetchall()
assert else_result == [
(3, 1, 'pk_1_data'),
(3, 2, 'pk_2_data'),
(6, 3, 'pk_3_data'),
(6, 4, 'pk_4_data'),
(6, 5, 'pk_5_data'),
(0, 6, 'pk_6_data')
]
def test_literal_interpretation(self):
t = table('test', column('col1'))
assert_raises(exc.ArgumentError, case, [("x", "y")])
self.assert_compile(
case([("x", "y")], value=t.c.col1),
"CASE test.col1 WHEN :param_1 THEN :param_2 END")
self.assert_compile(
case([(t.c.col1 == 7, "y")], else_="z"),
"CASE WHEN (test.col1 = :col1_1) THEN :param_1 ELSE :param_2 END")
def test_text_doesnt_explode(self):
for s in [
select(
[
case(
[
(
info_table.c.info == 'pk_4_data',
text("'yes'"))],
else_=text("'no'"))
]).order_by(info_table.c.info),
select(
[
case(
[
(
info_table.c.info == 'pk_4_data',
literal_column("'yes'"))],
else_=literal_column("'no'")
)]
).order_by(info_table.c.info),
]:
if testing.against("firebird"):
eq_(s.execute().fetchall(), [
('no ', ), ('no ', ), ('no ', ), ('yes', ),
('no ', ), ('no ', ),
])
else:
eq_(s.execute().fetchall(), [
('no', ), ('no', ), ('no', ), ('yes', ),
('no', ), ('no', ),
])
@testing.fails_on('firebird', 'FIXME: unknown')
def testcase_with_dict(self):
query = select(
[
case(
{
info_table.c.pk < 3: 'lessthan3',
info_table.c.pk >= 3: 'gt3',
}, else_='other'),
info_table.c.pk, info_table.c.info
],
from_obj=[info_table])
assert query.execute().fetchall() == [
('lessthan3', 1, 'pk_1_data'),
('lessthan3', 2, 'pk_2_data'),
('gt3', 3, 'pk_3_data'),
('gt3', 4, 'pk_4_data'),
('gt3', 5, 'pk_5_data'),
('gt3', 6, 'pk_6_data')
]
simple_query = select(
[
case(
{1: 'one', 2: 'two', },
value=info_table.c.pk, else_='other'),
info_table.c.pk
],
whereclause=info_table.c.pk < 4,
from_obj=[info_table])
assert simple_query.execute().fetchall() == [
('one', 1),
('two', 2),
('other', 3),
]
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