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sqlalchemy/test/sql/test_returning.py
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Mike Bayer f07e050c9c Implement new ClauseElement role and coercion system 
A major refactoring of all the functions handle all detection of
Core argument types as well as perform coercions into a new class hierarchy
based on "roles", each of which identify a syntactical location within a
SQL statement.  In contrast to the ClauseElement hierarchy that identifies
"what" each object is syntactically, the SQLRole hierarchy identifies
the "where does it go" of each object syntactically.   From this we define
a consistent type checking and coercion system that establishes well
defined behviors.

This is a breakout of the patch that is reorganizing select()
constructs to no longer be in the FromClause hierarchy.

Also includes a rename of as_scalar() into scalar_subquery(); deprecates
automatic coercion to scalar_subquery().

Partially-fixes: #4617
Change-Id: I26f1e78898693c6b99ef7ea2f4e7dfd0e8e1a1bd
2019-05-18 17:46:10 -04:00

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import itertools
from sqlalchemy import Boolean
from sqlalchemy import exc as sa_exc
from sqlalchemy import func
from sqlalchemy import Integer
from sqlalchemy import MetaData
from sqlalchemy import select
from sqlalchemy import Sequence
from sqlalchemy import String
from sqlalchemy import testing
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import AssertsExecutionResults
from sqlalchemy.testing import engines
from sqlalchemy.testing import eq_
from sqlalchemy.testing import fixtures
from sqlalchemy.testing.schema import Column
from sqlalchemy.testing.schema import Table
from sqlalchemy.types import TypeDecorator
table = GoofyType = seq = None
class ReturningTest(fixtures.TestBase, AssertsExecutionResults):
__requires__ = ("returning",)
__backend__ = True
def setup(self):
meta = MetaData(testing.db)
global table, GoofyType
class GoofyType(TypeDecorator):
impl = String
def process_bind_param(self, value, dialect):
if value is None:
return None
return "FOO" + value
def process_result_value(self, value, dialect):
if value is None:
return None
return value + "BAR"
table = Table(
"tables",
meta,
Column(
"id", Integer, primary_key=True, test_needs_autoincrement=True
),
Column("persons", Integer),
Column("full", Boolean),
Column("goofy", GoofyType(50)),
)
table.create(checkfirst=True)
def teardown(self):
table.drop()
def test_column_targeting(self):
result = (
table.insert()
.returning(table.c.id, table.c.full)
.execute({"persons": 1, "full": False})
)
row = result.first()
assert row[table.c.id] == row["id"] == 1
assert row[table.c.full] == row["full"]
assert row["full"] is False
result = (
table.insert()
.values(persons=5, full=True, goofy="somegoofy")
.returning(table.c.persons, table.c.full, table.c.goofy)
.execute()
)
row = result.first()
assert row[table.c.persons] == row["persons"] == 5
assert row[table.c.full] == row["full"]
eq_(row[table.c.goofy], row["goofy"])
eq_(row["goofy"], "FOOsomegoofyBAR")
@testing.fails_on("firebird", "fb can't handle returning x AS y")
def test_labeling(self):
result = (
table.insert()
.values(persons=6)
.returning(table.c.persons.label("lala"))
.execute()
)
row = result.first()
assert row["lala"] == 6
@testing.fails_on(
"firebird", "fb/kintersbasdb can't handle the bind params"
)
@testing.fails_on("oracle+zxjdbc", "JDBC driver bug")
def test_anon_expressions(self):
result = (
table.insert()
.values(goofy="someOTHERgoofy")
.returning(func.lower(table.c.goofy, type_=GoofyType))
.execute()
)
row = result.first()
eq_(row[0], "foosomeothergoofyBAR")
result = (
table.insert()
.values(persons=12)
.returning(table.c.persons + 18)
.execute()
)
row = result.first()
eq_(row[0], 30)
def test_update_returning(self):
table.insert().execute(
[{"persons": 5, "full": False}, {"persons": 3, "full": False}]
)
result = (
table.update(table.c.persons > 4, dict(full=True))
.returning(table.c.id)
.execute()
)
eq_(result.fetchall(), [(1,)])
result2 = (
select([table.c.id, table.c.full]).order_by(table.c.id).execute()
)
eq_(result2.fetchall(), [(1, True), (2, False)])
def test_insert_returning(self):
result = (
table.insert()
.returning(table.c.id)
.execute({"persons": 1, "full": False})
)
eq_(result.fetchall(), [(1,)])
@testing.requires.multivalues_inserts
def test_multirow_returning(self):
ins = (
table.insert()
.returning(table.c.id, table.c.persons)
.values(
[
{"persons": 1, "full": False},
{"persons": 2, "full": True},
{"persons": 3, "full": False},
]
)
)
result = testing.db.execute(ins)
eq_(result.fetchall(), [(1, 1), (2, 2), (3, 3)])
def test_no_ipk_on_returning(self):
result = testing.db.execute(
table.insert().returning(table.c.id), {"persons": 1, "full": False}
)
assert_raises_message(
sa_exc.InvalidRequestError,
r"Can't call inserted_primary_key when returning\(\) is used.",
getattr,
result,
"inserted_primary_key",
)
@testing.fails_on_everything_except("postgresql", "firebird")
def test_literal_returning(self):
if testing.against("postgresql"):
literal_true = "true"
else:
literal_true = "1"
result4 = testing.db.execute(
'insert into tables (id, persons, "full") '
"values (5, 10, %s) returning persons" % literal_true
)
eq_([dict(row) for row in result4], [{"persons": 10}])
def test_delete_returning(self):
table.insert().execute(
[{"persons": 5, "full": False}, {"persons": 3, "full": False}]
)
result = (
table.delete(table.c.persons > 4).returning(table.c.id).execute()
)
eq_(result.fetchall(), [(1,)])
result2 = (
select([table.c.id, table.c.full]).order_by(table.c.id).execute()
)
eq_(result2.fetchall(), [(2, False)])
class CompositeStatementTest(fixtures.TestBase):
__requires__ = ("returning",)
__backend__ = True
@testing.provide_metadata
def test_select_doesnt_pollute_result(self):
class MyType(TypeDecorator):
impl = Integer
def process_result_value(self, value, dialect):
raise Exception("I have not been selected")
t1 = Table("t1", self.metadata, Column("x", MyType()))
t2 = Table("t2", self.metadata, Column("x", Integer))
self.metadata.create_all(testing.db)
with testing.db.connect() as conn:
conn.execute(t1.insert().values(x=5))
stmt = (
t2.insert()
.values(x=select([t1.c.x]).scalar_subquery())
.returning(t2.c.x)
)
result = conn.execute(stmt)
eq_(result.scalar(), 5)
class SequenceReturningTest(fixtures.TestBase):
__requires__ = "returning", "sequences"
__backend__ = True
def setup(self):
meta = MetaData(testing.db)
global table, seq
seq = Sequence("tid_seq")
table = Table(
"tables",
meta,
Column("id", Integer, seq, primary_key=True),
Column("data", String(50)),
)
table.create(checkfirst=True)
def teardown(self):
table.drop()
def test_insert(self):
r = table.insert().values(data="hi").returning(table.c.id).execute()
assert r.first() == (1,)
assert seq.execute() == 2
class KeyReturningTest(fixtures.TestBase, AssertsExecutionResults):
"""test returning() works with columns that define 'key'."""
__requires__ = ("returning",)
__backend__ = True
def setup(self):
meta = MetaData(testing.db)
global table
table = Table(
"tables",
meta,
Column(
"id",
Integer,
primary_key=True,
key="foo_id",
test_needs_autoincrement=True,
),
Column("data", String(20)),
)
table.create(checkfirst=True)
def teardown(self):
table.drop()
@testing.exclude("firebird", "<", (2, 0), "2.0+ feature")
@testing.exclude("postgresql", "<", (8, 2), "8.2+ feature")
def test_insert(self):
result = (
table.insert().returning(table.c.foo_id).execute(data="somedata")
)
row = result.first()
assert row[table.c.foo_id] == row["id"] == 1
result = table.select().execute().first()
assert row[table.c.foo_id] == row["id"] == 1
class ReturnDefaultsTest(fixtures.TablesTest):
__requires__ = ("returning",)
run_define_tables = "each"
__backend__ = True
@classmethod
def define_tables(cls, metadata):
from sqlalchemy.sql import ColumnElement
from sqlalchemy.ext.compiler import compiles
counter = itertools.count()
class IncDefault(ColumnElement):
pass
@compiles(IncDefault)
def compile_(element, compiler, **kw):
return str(next(counter))
Table(
"t1",
metadata,
Column(
"id", Integer, primary_key=True, test_needs_autoincrement=True
),
Column("data", String(50)),
Column("insdef", Integer, default=IncDefault()),
Column("upddef", Integer, onupdate=IncDefault()),
)
def test_chained_insert_pk(self):
t1 = self.tables.t1
result = testing.db.execute(
t1.insert().values(upddef=1).return_defaults(t1.c.insdef)
)
eq_(
[result.returned_defaults[k] for k in (t1.c.id, t1.c.insdef)],
[1, 0],
)
def test_arg_insert_pk(self):
t1 = self.tables.t1
result = testing.db.execute(
t1.insert(return_defaults=[t1.c.insdef]).values(upddef=1)
)
eq_(
[result.returned_defaults[k] for k in (t1.c.id, t1.c.insdef)],
[1, 0],
)
def test_chained_update_pk(self):
t1 = self.tables.t1
testing.db.execute(t1.insert().values(upddef=1))
result = testing.db.execute(
t1.update().values(data="d1").return_defaults(t1.c.upddef)
)
eq_([result.returned_defaults[k] for k in (t1.c.upddef,)], [1])
def test_arg_update_pk(self):
t1 = self.tables.t1
testing.db.execute(t1.insert().values(upddef=1))
result = testing.db.execute(
t1.update(return_defaults=[t1.c.upddef]).values(data="d1")
)
eq_([result.returned_defaults[k] for k in (t1.c.upddef,)], [1])
def test_insert_non_default(self):
"""test that a column not marked at all as a
default works with this feature."""
t1 = self.tables.t1
result = testing.db.execute(
t1.insert().values(upddef=1).return_defaults(t1.c.data)
)
eq_(
[result.returned_defaults[k] for k in (t1.c.id, t1.c.data)],
[1, None],
)
def test_update_non_default(self):
"""test that a column not marked at all as a
default works with this feature."""
t1 = self.tables.t1
testing.db.execute(t1.insert().values(upddef=1))
result = testing.db.execute(
t1.update().values(upddef=2).return_defaults(t1.c.data)
)
eq_([result.returned_defaults[k] for k in (t1.c.data,)], [None])
def test_insert_non_default_plus_default(self):
t1 = self.tables.t1
result = testing.db.execute(
t1.insert()
.values(upddef=1)
.return_defaults(t1.c.data, t1.c.insdef)
)
eq_(
dict(result.returned_defaults),
{"id": 1, "data": None, "insdef": 0},
)
def test_update_non_default_plus_default(self):
t1 = self.tables.t1
testing.db.execute(t1.insert().values(upddef=1))
result = testing.db.execute(
t1.update()
.values(insdef=2)
.return_defaults(t1.c.data, t1.c.upddef)
)
eq_(dict(result.returned_defaults), {"data": None, "upddef": 1})
def test_insert_all(self):
t1 = self.tables.t1
result = testing.db.execute(
t1.insert().values(upddef=1).return_defaults()
)
eq_(
dict(result.returned_defaults),
{"id": 1, "data": None, "insdef": 0},
)
def test_update_all(self):
t1 = self.tables.t1
testing.db.execute(t1.insert().values(upddef=1))
result = testing.db.execute(
t1.update().values(insdef=2).return_defaults()
)
eq_(dict(result.returned_defaults), {"upddef": 1})
class ImplicitReturningFlag(fixtures.TestBase):
__backend__ = True
def test_flag_turned_off(self):
e = engines.testing_engine(options={"implicit_returning": False})
assert e.dialect.implicit_returning is False
c = e.connect()
c.close()
assert e.dialect.implicit_returning is False
def test_flag_turned_on(self):
e = engines.testing_engine(options={"implicit_returning": True})
assert e.dialect.implicit_returning is True
c = e.connect()
c.close()
assert e.dialect.implicit_returning is True
def test_flag_turned_default(self):
supports = [False]
def go():
supports[0] = True
testing.requires.returning(go)()
e = engines.testing_engine()
# starts as False. This is because all of Firebird,
# PostgreSQL, Oracle, SQL Server started supporting RETURNING
# as of a certain version, and the flag is not set until
# version detection occurs. If some DB comes along that has
# RETURNING in all cases, this test can be adjusted.
assert e.dialect.implicit_returning is False
# version detection on connect sets it
c = e.connect()
c.close()
assert e.dialect.implicit_returning is supports[0]
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