Viewing file:  test_cte.py (6.63 KB) -rw-r--r--
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from .. import config
from .. import fixtures
from ..assertions import eq_
from ..schema import Column
from ..schema import Table
from ... import ForeignKey
from ... import Integer
from ... import select
from ... import String
from ... import testing
class CTETest(fixtures.TablesTest):
__backend__ = True
__requires__ = ("ctes",)
run_inserts = "each"
run_deletes = "each"
@classmethod
def define_tables(cls, metadata):
Table(
"some_table",
metadata,
Column("id", Integer, primary_key=True),
Column("data", String(50)),
Column("parent_id", ForeignKey("some_table.id")),
)
Table(
"some_other_table",
metadata,
Column("id", Integer, primary_key=True),
Column("data", String(50)),
Column("parent_id", Integer),
)
@classmethod
def insert_data(cls):
config.db.execute(
cls.tables.some_table.insert(),
[
{"id": 1, "data": "d1", "parent_id": None},
{"id": 2, "data": "d2", "parent_id": 1},
{"id": 3, "data": "d3", "parent_id": 1},
{"id": 4, "data": "d4", "parent_id": 3},
{"id": 5, "data": "d5", "parent_id": 3},
],
)
def test_select_nonrecursive_round_trip(self):
some_table = self.tables.some_table
with config.db.connect() as conn:
cte = (
select([some_table])
.where(some_table.c.data.in_(["d2", "d3", "d4"]))
.cte("some_cte")
)
result = conn.execute(
select([cte.c.data]).where(cte.c.data.in_(["d4", "d5"]))
)
eq_(result.fetchall(), [("d4",)])
def test_select_recursive_round_trip(self):
some_table = self.tables.some_table
with config.db.connect() as conn:
cte = (
select([some_table])
.where(some_table.c.data.in_(["d2", "d3", "d4"]))
.cte("some_cte", recursive=True)
)
cte_alias = cte.alias("c1")
st1 = some_table.alias()
# note that SQL Server requires this to be UNION ALL,
# can't be UNION
cte = cte.union_all(
select([st1]).where(st1.c.id == cte_alias.c.parent_id)
)
result = conn.execute(
select([cte.c.data])
.where(cte.c.data != "d2")
.order_by(cte.c.data.desc())
)
eq_(
result.fetchall(),
[("d4",), ("d3",), ("d3",), ("d1",), ("d1",), ("d1",)],
)
def test_insert_from_select_round_trip(self):
some_table = self.tables.some_table
some_other_table = self.tables.some_other_table
with config.db.connect() as conn:
cte = (
select([some_table])
.where(some_table.c.data.in_(["d2", "d3", "d4"]))
.cte("some_cte")
)
conn.execute(
some_other_table.insert().from_select(
["id", "data", "parent_id"], select([cte])
)
)
eq_(
conn.execute(
select([some_other_table]).order_by(some_other_table.c.id)
).fetchall(),
[(2, "d2", 1), (3, "d3", 1), (4, "d4", 3)],
)
@testing.requires.ctes_with_update_delete
@testing.requires.update_from
def test_update_from_round_trip(self):
some_table = self.tables.some_table
some_other_table = self.tables.some_other_table
with config.db.connect() as conn:
conn.execute(
some_other_table.insert().from_select(
["id", "data", "parent_id"], select([some_table])
)
)
cte = (
select([some_table])
.where(some_table.c.data.in_(["d2", "d3", "d4"]))
.cte("some_cte")
)
conn.execute(
some_other_table.update()
.values(parent_id=5)
.where(some_other_table.c.data == cte.c.data)
)
eq_(
conn.execute(
select([some_other_table]).order_by(some_other_table.c.id)
).fetchall(),
[
(1, "d1", None),
(2, "d2", 5),
(3, "d3", 5),
(4, "d4", 5),
(5, "d5", 3),
],
)
@testing.requires.ctes_with_update_delete
@testing.requires.delete_from
def test_delete_from_round_trip(self):
some_table = self.tables.some_table
some_other_table = self.tables.some_other_table
with config.db.connect() as conn:
conn.execute(
some_other_table.insert().from_select(
["id", "data", "parent_id"], select([some_table])
)
)
cte = (
select([some_table])
.where(some_table.c.data.in_(["d2", "d3", "d4"]))
.cte("some_cte")
)
conn.execute(
some_other_table.delete().where(
some_other_table.c.data == cte.c.data
)
)
eq_(
conn.execute(
select([some_other_table]).order_by(some_other_table.c.id)
).fetchall(),
[(1, "d1", None), (5, "d5", 3)],
)
@testing.requires.ctes_with_update_delete
def test_delete_scalar_subq_round_trip(self):
some_table = self.tables.some_table
some_other_table = self.tables.some_other_table
with config.db.connect() as conn:
conn.execute(
some_other_table.insert().from_select(
["id", "data", "parent_id"], select([some_table])
)
)
cte = (
select([some_table])
.where(some_table.c.data.in_(["d2", "d3", "d4"]))
.cte("some_cte")
)
conn.execute(
some_other_table.delete().where(
some_other_table.c.data
== select([cte.c.data]).where(
cte.c.id == some_other_table.c.id
)
)
)
eq_(
conn.execute(
select([some_other_table]).order_by(some_other_table.c.id)
).fetchall(),
[(1, "d1", None), (5, "d5", 3)],
)
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