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from sqlalchemy import Table, Column, String, func, MetaData, select, TypeDecorator, cast
from sqlalchemy.testing import fixtures, AssertsCompiledSQL
from sqlalchemy import testing
from sqlalchemy.testing import eq_
class _ExprFixture(object):
def _fixture(self):
class MyString(String):
def bind_expression(self, bindvalue):
return func.lower(bindvalue)
def column_expression(self, col):
return func.lower(col)
test_table = Table(
'test_table',
MetaData(), Column('x', String), Column('y', MyString)
)
return test_table
class SelectTest(_ExprFixture, fixtures.TestBase, AssertsCompiledSQL):
__dialect__ = 'default'
def test_select_cols(self):
table = self._fixture()
self.assert_compile(
select([table]),
"SELECT test_table.x, lower(test_table.y) AS y FROM test_table"
)
def test_anonymous_expr(self):
table = self._fixture()
self.assert_compile(
select([cast(table.c.y, String)]),
"SELECT CAST(test_table.y AS VARCHAR) AS anon_1 FROM test_table"
)
def test_select_cols_use_labels(self):
table = self._fixture()
self.assert_compile(
select([table]).apply_labels(),
"SELECT test_table.x AS test_table_x, "
"lower(test_table.y) AS test_table_y FROM test_table"
)
def test_select_cols_use_labels_result_map_targeting(self):
table = self._fixture()
compiled = select([table]).apply_labels().compile()
assert table.c.y in compiled._create_result_map()['test_table_y'][1]
assert table.c.x in compiled._create_result_map()['test_table_x'][1]
# the lower() function goes into the result_map, we don't really
# need this but it's fine
self.assert_compile(
compiled._create_result_map()['test_table_y'][1][2],
"lower(test_table.y)"
)
# then the original column gets put in there as well.
# it's not important that it's the last value.
self.assert_compile(
compiled._create_result_map()['test_table_y'][1][-1],
"test_table.y"
)
def test_insert_binds(self):
table = self._fixture()
self.assert_compile(
table.insert(),
"INSERT INTO test_table (x, y) VALUES (:x, lower(:y))"
)
self.assert_compile(
table.insert().values(y="hi"),
"INSERT INTO test_table (y) VALUES (lower(:y))"
)
def test_select_binds(self):
table = self._fixture()
self.assert_compile(
select([table]).where(table.c.y == "hi"),
"SELECT test_table.x, lower(test_table.y) AS y FROM "
"test_table WHERE test_table.y = lower(:y_1)"
)
class DerivedTest(_ExprFixture, fixtures.TestBase, AssertsCompiledSQL):
__dialect__ = 'default'
def test_select_from_select(self):
table = self._fixture()
self.assert_compile(
table.select().select(),
"SELECT x, lower(y) AS y FROM (SELECT test_table.x "
"AS x, test_table.y AS y FROM test_table)"
)
def test_select_from_alias(self):
table = self._fixture()
self.assert_compile(
table.select().alias().select(),
"SELECT anon_1.x, lower(anon_1.y) AS y FROM (SELECT "
"test_table.x AS x, test_table.y AS y "
"FROM test_table) AS anon_1"
)
def test_select_from_aliased_join(self):
table = self._fixture()
s1 = table.select().alias()
s2 = table.select().alias()
j = s1.join(s2, s1.c.x == s2.c.x)
s3 = j.select()
self.assert_compile(
s3, "SELECT anon_1.x, lower(anon_1.y) AS y, anon_2.x, "
"lower(anon_2.y) AS y "
"FROM (SELECT test_table.x AS x, test_table.y AS y "
"FROM test_table) AS anon_1 JOIN (SELECT "
"test_table.x AS x, test_table.y AS y "
"FROM test_table) AS anon_2 ON anon_1.x = anon_2.x")
class RoundTripTestBase(object):
def test_round_trip(self):
testing.db.execute(
self.tables.test_table.insert(),
{"x": "X1", "y": "Y1"},
{"x": "X2", "y": "Y2"},
{"x": "X3", "y": "Y3"},
)
# test insert coercion alone
eq_(
testing.db.execute(
"select * from test_table order by y").fetchall(),
[
("X1", "y1"),
("X2", "y2"),
("X3", "y3"),
]
)
# conversion back to upper
eq_(
testing.db.execute(
select([self.tables.test_table]).
order_by(self.tables.test_table.c.y)
).fetchall(),
[
("X1", "Y1"),
("X2", "Y2"),
("X3", "Y3"),
]
)
def test_targeting_no_labels(self):
testing.db.execute(
self.tables.test_table.insert(),
{"x": "X1", "y": "Y1"},
)
row = testing.db.execute(select([self.tables.test_table])).first()
eq_(
row[self.tables.test_table.c.y],
"Y1"
)
def test_targeting_by_string(self):
testing.db.execute(
self.tables.test_table.insert(),
{"x": "X1", "y": "Y1"},
)
row = testing.db.execute(select([self.tables.test_table])).first()
eq_(
row["y"],
"Y1"
)
def test_targeting_apply_labels(self):
testing.db.execute(
self.tables.test_table.insert(),
{"x": "X1", "y": "Y1"},
)
row = testing.db.execute(select([self.tables.test_table]).
apply_labels()).first()
eq_(
row[self.tables.test_table.c.y],
"Y1"
)
def test_targeting_individual_labels(self):
testing.db.execute(
self.tables.test_table.insert(),
{"x": "X1", "y": "Y1"},
)
row = testing.db.execute(select([
self.tables.test_table.c.x.label('xbar'),
self.tables.test_table.c.y.label('ybar')
])).first()
eq_(
row[self.tables.test_table.c.y],
"Y1"
)
class StringRoundTripTest(fixtures.TablesTest, RoundTripTestBase):
@classmethod
def define_tables(cls, metadata):
class MyString(String):
def bind_expression(self, bindvalue):
return func.lower(bindvalue)
def column_expression(self, col):
return func.upper(col)
Table(
'test_table',
metadata,
Column('x', String(50)),
Column('y', MyString(50)
)
)
class TypeDecRoundTripTest(fixtures.TablesTest, RoundTripTestBase):
@classmethod
def define_tables(cls, metadata):
class MyString(TypeDecorator):
impl = String
def bind_expression(self, bindvalue):
return func.lower(bindvalue)
def column_expression(self, col):
return func.upper(col)
Table(
'test_table',
metadata,
Column('x', String(50)),
Column('y', MyString(50)
)
)
class ReturningTest(fixtures.TablesTest):
__requires__ = 'returning',
@classmethod
def define_tables(cls, metadata):
class MyString(String):
def column_expression(self, col):
return func.lower(col)
Table(
'test_table',
metadata, Column('x', String(50)),
Column('y', MyString(50), server_default="YVALUE")
)
@testing.provide_metadata
def test_insert_returning(self):
table = self.tables.test_table
result = testing.db.execute(
table.insert().returning(table.c.y),
{"x": "xvalue"}
)
eq_(
result.first(),
("yvalue",)
)
|
