mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-16 13:47:20 -04:00
Mike Bayer
ef7ff058eb
As part of the SQLAlchemy 2.0 migration project, a conceptual change has been made to the role of the :class:`.SelectBase` class hierarchy, which is the root of all "SELECT" statement constructs, in that they no longer serve directly as FROM clauses, that is, they no longer subclass :class:`.FromClause`. For end users, the change mostly means that any placement of a :func:`.select` construct in the FROM clause of another :func:`.select` requires first that it be wrapped in a subquery first, which historically is through the use of the :meth:`.SelectBase.alias` method, and is now also available through the use of :meth:`.SelectBase.subquery`. This was usually a requirement in any case since several databases don't accept unnamed SELECT subqueries in their FROM clause in any case. See the documentation in this change for lots more detail. Fixes: #4617 Change-Id: I0f6174ee24b9a1a4529168e52e855e12abd60667
627 lines
22 KiB
Python
627 lines
22 KiB
Python
import importlib
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import itertools
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from sqlalchemy import and_
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from sqlalchemy import Boolean
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from sqlalchemy import case
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from sqlalchemy import cast
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from sqlalchemy import Column
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from sqlalchemy import column
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from sqlalchemy import dialects
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from sqlalchemy import exists
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from sqlalchemy import extract
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from sqlalchemy import Float
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from sqlalchemy import Integer
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from sqlalchemy import MetaData
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from sqlalchemy import or_
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from sqlalchemy import select
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from sqlalchemy import String
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from sqlalchemy import Table
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from sqlalchemy import table
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from sqlalchemy import text
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from sqlalchemy import tuple_
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from sqlalchemy import union
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from sqlalchemy import union_all
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from sqlalchemy import util
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from sqlalchemy.schema import Sequence
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from sqlalchemy.sql import bindparam
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from sqlalchemy.sql import ColumnElement
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from sqlalchemy.sql import False_
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from sqlalchemy.sql import func
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from sqlalchemy.sql import operators
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from sqlalchemy.sql import True_
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from sqlalchemy.sql import type_coerce
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from sqlalchemy.sql import visitors
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from sqlalchemy.sql.elements import _label_reference
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from sqlalchemy.sql.elements import _textual_label_reference
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from sqlalchemy.sql.elements import Annotated
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from sqlalchemy.sql.elements import ClauseElement
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from sqlalchemy.sql.elements import ClauseList
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from sqlalchemy.sql.elements import CollationClause
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from sqlalchemy.sql.elements import Immutable
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from sqlalchemy.sql.elements import Null
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from sqlalchemy.sql.elements import Slice
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from sqlalchemy.sql.elements import UnaryExpression
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from sqlalchemy.sql.functions import FunctionElement
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from sqlalchemy.sql.functions import GenericFunction
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from sqlalchemy.sql.functions import ReturnTypeFromArgs
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from sqlalchemy.sql.selectable import _OffsetLimitParam
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from sqlalchemy.sql.selectable import FromGrouping
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from sqlalchemy.sql.selectable import Selectable
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from sqlalchemy.sql.selectable import SelectStatementGrouping
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from sqlalchemy.testing import assert_raises_message
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from sqlalchemy.testing import eq_
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from sqlalchemy.testing import fixtures
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from sqlalchemy.testing import is_
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from sqlalchemy.testing import is_false
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from sqlalchemy.testing import is_true
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from sqlalchemy.testing import ne_
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from sqlalchemy.util import class_hierarchy
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meta = MetaData()
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meta2 = MetaData()
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table_a = Table("a", meta, Column("a", Integer), Column("b", String))
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table_a_2 = Table("a", meta2, Column("a", Integer), Column("b", String))
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table_b = Table("b", meta, Column("a", Integer), Column("b", Integer))
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table_c = Table("c", meta, Column("x", Integer), Column("y", Integer))
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table_d = Table("d", meta, Column("y", Integer), Column("z", Integer))
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class CompareAndCopyTest(fixtures.TestBase):
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# lambdas which return a tuple of ColumnElement objects.
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# must return at least two objects that should compare differently.
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# to test more varieties of "difference" additional objects can be added.
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fixtures = [
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lambda: (
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column("q"),
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column("x"),
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column("q", Integer),
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column("q", String),
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),
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lambda: (~column("q", Boolean), ~column("p", Boolean)),
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lambda: (
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table_a.c.a.label("foo"),
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table_a.c.a.label("bar"),
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table_a.c.b.label("foo"),
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),
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lambda: (
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_label_reference(table_a.c.a.desc()),
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_label_reference(table_a.c.a.asc()),
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),
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lambda: (_textual_label_reference("a"), _textual_label_reference("b")),
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lambda: (
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text("select a, b from table").columns(a=Integer, b=String),
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text("select a, b, c from table").columns(
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a=Integer, b=String, c=Integer
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),
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),
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lambda: (
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column("q") == column("x"),
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column("q") == column("y"),
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column("z") == column("x"),
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),
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lambda: (
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cast(column("q"), Integer),
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cast(column("q"), Float),
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cast(column("p"), Integer),
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),
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lambda: (
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bindparam("x"),
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bindparam("y"),
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bindparam("x", type_=Integer),
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bindparam("x", type_=String),
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bindparam(None),
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),
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lambda: (_OffsetLimitParam("x"), _OffsetLimitParam("y")),
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lambda: (func.foo(), func.foo(5), func.bar()),
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lambda: (func.current_date(), func.current_time()),
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lambda: (
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func.next_value(Sequence("q")),
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func.next_value(Sequence("p")),
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),
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lambda: (True_(), False_()),
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lambda: (Null(),),
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lambda: (ReturnTypeFromArgs("foo"), ReturnTypeFromArgs(5)),
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lambda: (FunctionElement(5), FunctionElement(5, 6)),
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lambda: (func.count(), func.not_count()),
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lambda: (func.char_length("abc"), func.char_length("def")),
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lambda: (GenericFunction("a", "b"), GenericFunction("a")),
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lambda: (CollationClause("foobar"), CollationClause("batbar")),
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lambda: (
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type_coerce(column("q", Integer), String),
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type_coerce(column("q", Integer), Float),
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type_coerce(column("z", Integer), Float),
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),
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lambda: (table_a.c.a, table_b.c.a),
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lambda: (tuple_([1, 2]), tuple_([3, 4])),
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lambda: (func.array_agg([1, 2]), func.array_agg([3, 4])),
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lambda: (
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func.percentile_cont(0.5).within_group(table_a.c.a),
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func.percentile_cont(0.5).within_group(table_a.c.b),
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func.percentile_cont(0.5).within_group(table_a.c.a, table_a.c.b),
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func.percentile_cont(0.5).within_group(
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table_a.c.a, table_a.c.b, column("q")
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),
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),
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lambda: (
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func.is_equal("a", "b").as_comparison(1, 2),
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func.is_equal("a", "c").as_comparison(1, 2),
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func.is_equal("a", "b").as_comparison(2, 1),
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func.is_equal("a", "b", "c").as_comparison(1, 2),
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func.foobar("a", "b").as_comparison(1, 2),
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),
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lambda: (
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func.row_number().over(order_by=table_a.c.a),
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func.row_number().over(order_by=table_a.c.a, range_=(0, 10)),
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func.row_number().over(order_by=table_a.c.a, range_=(None, 10)),
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func.row_number().over(order_by=table_a.c.a, rows=(None, 20)),
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func.row_number().over(order_by=table_a.c.b),
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func.row_number().over(
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order_by=table_a.c.a, partition_by=table_a.c.b
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),
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),
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lambda: (
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func.count(1).filter(table_a.c.a == 5),
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func.count(1).filter(table_a.c.a == 10),
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func.foob(1).filter(table_a.c.a == 10),
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),
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lambda: (
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and_(table_a.c.a == 5, table_a.c.b == table_b.c.a),
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and_(table_a.c.a == 5, table_a.c.a == table_b.c.a),
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or_(table_a.c.a == 5, table_a.c.b == table_b.c.a),
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ClauseList(table_a.c.a == 5, table_a.c.b == table_b.c.a),
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ClauseList(table_a.c.a == 5, table_a.c.b == table_a.c.a),
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),
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lambda: (
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case(whens=[(table_a.c.a == 5, 10), (table_a.c.a == 10, 20)]),
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case(whens=[(table_a.c.a == 18, 10), (table_a.c.a == 10, 20)]),
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case(whens=[(table_a.c.a == 5, 10), (table_a.c.b == 10, 20)]),
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case(
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whens=[
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(table_a.c.a == 5, 10),
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(table_a.c.b == 10, 20),
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(table_a.c.a == 9, 12),
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]
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),
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case(
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whens=[(table_a.c.a == 5, 10), (table_a.c.a == 10, 20)],
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else_=30,
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),
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case({"wendy": "W", "jack": "J"}, value=table_a.c.a, else_="E"),
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case({"wendy": "W", "jack": "J"}, value=table_a.c.b, else_="E"),
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case({"wendy_w": "W", "jack": "J"}, value=table_a.c.a, else_="E"),
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),
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lambda: (
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extract("foo", table_a.c.a),
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extract("foo", table_a.c.b),
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extract("bar", table_a.c.a),
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),
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lambda: (
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Slice(1, 2, 5),
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Slice(1, 5, 5),
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Slice(1, 5, 10),
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Slice(2, 10, 15),
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),
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lambda: (
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select([table_a.c.a]),
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select([table_a.c.a, table_a.c.b]),
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select([table_a.c.b, table_a.c.a]),
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select([table_a.c.a]).where(table_a.c.b == 5),
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select([table_a.c.a])
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.where(table_a.c.b == 5)
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.where(table_a.c.a == 10),
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select([table_a.c.a]).where(table_a.c.b == 5).with_for_update(),
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select([table_a.c.a])
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.where(table_a.c.b == 5)
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.with_for_update(nowait=True),
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select([table_a.c.a]).where(table_a.c.b == 5).correlate(table_b),
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select([table_a.c.a])
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.where(table_a.c.b == 5)
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.correlate_except(table_b),
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),
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lambda: (
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table_a.join(table_b, table_a.c.a == table_b.c.a),
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table_a.join(
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table_b, and_(table_a.c.a == table_b.c.a, table_a.c.b == 1)
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),
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table_a.outerjoin(table_b, table_a.c.a == table_b.c.a),
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),
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lambda: (
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table_a.alias("a"),
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table_a.alias("b"),
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table_a.alias(),
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table_b.alias("a"),
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select([table_a.c.a]).alias("a"),
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),
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lambda: (
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FromGrouping(table_a.alias("a")),
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FromGrouping(table_a.alias("b")),
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),
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lambda: (
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SelectStatementGrouping(select([table_a])),
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SelectStatementGrouping(select([table_b])),
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),
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lambda: (
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select([table_a.c.a]).scalar_subquery(),
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select([table_a.c.a]).where(table_a.c.b == 5).scalar_subquery(),
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),
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lambda: (
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exists().where(table_a.c.a == 5),
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exists().where(table_a.c.b == 5),
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),
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lambda: (
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union(select([table_a.c.a]), select([table_a.c.b])),
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union(select([table_a.c.a]), select([table_a.c.b])).order_by("a"),
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union_all(select([table_a.c.a]), select([table_a.c.b])),
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union(select([table_a.c.a])),
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union(
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select([table_a.c.a]),
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select([table_a.c.b]).where(table_a.c.b > 5),
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),
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),
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lambda: (
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table("a", column("x"), column("y")),
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table("a", column("y"), column("x")),
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table("b", column("x"), column("y")),
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table("a", column("x"), column("y"), column("z")),
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table("a", column("x"), column("y", Integer)),
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table("a", column("q"), column("y", Integer)),
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),
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lambda: (
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Table("a", MetaData(), Column("q", Integer), Column("b", String)),
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Table("b", MetaData(), Column("q", Integer), Column("b", String)),
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),
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]
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@classmethod
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def setup_class(cls):
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# TODO: we need to get dialects here somehow, perhaps in test_suite?
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[
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importlib.import_module("sqlalchemy.dialects.%s" % d)
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for d in dialects.__all__
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if not d.startswith("_")
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]
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def test_all_present(self):
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need = set(
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cls
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for cls in class_hierarchy(ClauseElement)
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if issubclass(cls, (ColumnElement, Selectable))
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and "__init__" in cls.__dict__
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and not issubclass(cls, (Annotated))
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and "orm" not in cls.__module__
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and "compiler" not in cls.__module__
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and "crud" not in cls.__module__
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and "dialects" not in cls.__module__ # TODO: dialects?
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).difference({ColumnElement, UnaryExpression})
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for fixture in self.fixtures:
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case_a = fixture()
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for elem in case_a:
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for mro in type(elem).__mro__:
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need.discard(mro)
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is_false(bool(need), "%d Remaining classes: %r" % (len(need), need))
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def test_compare(self):
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for fixture in self.fixtures:
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case_a = fixture()
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case_b = fixture()
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for a, b in itertools.combinations_with_replacement(
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range(len(case_a)), 2
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):
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if a == b:
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is_true(
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case_a[a].compare(
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case_b[b], arbitrary_expression=True
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),
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"%r != %r" % (case_a[a], case_b[b]),
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)
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else:
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is_false(
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case_a[a].compare(
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case_b[b], arbitrary_expression=True
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),
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"%r == %r" % (case_a[a], case_b[b]),
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)
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def test_cache_key(self):
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def assert_params_append(assert_params):
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def append(param):
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if param._value_required_for_cache:
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assert_params.append(param)
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else:
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is_(param.value, None)
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return append
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for fixture in self.fixtures:
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case_a = fixture()
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case_b = fixture()
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for a, b in itertools.combinations_with_replacement(
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range(len(case_a)), 2
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):
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assert_a_params = []
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assert_b_params = []
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visitors.traverse_depthfirst(
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case_a[a],
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{},
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{"bindparam": assert_params_append(assert_a_params)},
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)
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visitors.traverse_depthfirst(
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case_b[b],
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{},
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{"bindparam": assert_params_append(assert_b_params)},
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)
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if assert_a_params:
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assert_raises_message(
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NotImplementedError,
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"bindparams collection argument required ",
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case_a[a]._cache_key,
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)
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if assert_b_params:
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assert_raises_message(
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NotImplementedError,
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"bindparams collection argument required ",
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case_b[b]._cache_key,
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)
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if not assert_a_params and not assert_b_params:
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if a == b:
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eq_(case_a[a]._cache_key(), case_b[b]._cache_key())
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else:
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ne_(case_a[a]._cache_key(), case_b[b]._cache_key())
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def test_cache_key_gather_bindparams(self):
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for fixture in self.fixtures:
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case_a = fixture()
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case_b = fixture()
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# in the "bindparams" case, the cache keys for bound parameters
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# with only different values will be the same, but the params
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# themselves are gathered into a collection.
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for a, b in itertools.combinations_with_replacement(
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range(len(case_a)), 2
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):
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a_params = {"bindparams": []}
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b_params = {"bindparams": []}
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if a == b:
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a_key = case_a[a]._cache_key(**a_params)
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b_key = case_b[b]._cache_key(**b_params)
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eq_(a_key, b_key)
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if a_params["bindparams"]:
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for a_param, b_param in zip(
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a_params["bindparams"], b_params["bindparams"]
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):
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assert a_param.compare(b_param)
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else:
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a_key = case_a[a]._cache_key(**a_params)
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b_key = case_b[b]._cache_key(**b_params)
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if a_key == b_key:
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for a_param, b_param in zip(
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a_params["bindparams"], b_params["bindparams"]
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):
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if not a_param.compare(b_param):
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break
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else:
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assert False, "Bound parameters are all the same"
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else:
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ne_(a_key, b_key)
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assert_a_params = []
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assert_b_params = []
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visitors.traverse_depthfirst(
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case_a[a], {}, {"bindparam": assert_a_params.append}
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)
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visitors.traverse_depthfirst(
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case_b[b], {}, {"bindparam": assert_b_params.append}
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)
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# note we're asserting the order of the params as well as
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# if there are dupes or not. ordering has to be deterministic
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# and matches what a traversal would provide.
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eq_(a_params["bindparams"], assert_a_params)
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eq_(b_params["bindparams"], assert_b_params)
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def test_compare_col_identity(self):
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stmt1 = (
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select([table_a.c.a, table_b.c.b])
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.where(table_a.c.a == table_b.c.b)
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.alias()
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)
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stmt1_c = (
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select([table_a.c.a, table_b.c.b])
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.where(table_a.c.a == table_b.c.b)
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.alias()
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)
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stmt2 = union(select([table_a]), select([table_b]))
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equivalents = {table_a.c.a: [table_b.c.a]}
|
|
|
|
is_false(
|
|
stmt1.compare(stmt2, use_proxies=True, equivalents=equivalents)
|
|
)
|
|
|
|
is_true(
|
|
stmt1.compare(stmt1_c, use_proxies=True, equivalents=equivalents)
|
|
)
|
|
is_true(
|
|
(table_a.c.a == table_b.c.b).compare(
|
|
stmt1.c.a == stmt1.c.b,
|
|
use_proxies=True,
|
|
equivalents=equivalents,
|
|
)
|
|
)
|
|
|
|
def test_copy_internals(self):
|
|
for fixture in self.fixtures:
|
|
case_a = fixture()
|
|
case_b = fixture()
|
|
|
|
assert case_a[0].compare(case_b[0])
|
|
|
|
clone = case_a[0]._clone()
|
|
clone._copy_internals()
|
|
|
|
assert clone.compare(case_b[0])
|
|
|
|
stack = [clone]
|
|
seen = {clone}
|
|
found_elements = False
|
|
while stack:
|
|
obj = stack.pop(0)
|
|
|
|
items = [
|
|
subelem
|
|
for key, elem in clone.__dict__.items()
|
|
if key != "_is_clone_of" and elem is not None
|
|
for subelem in util.to_list(elem)
|
|
if (
|
|
isinstance(subelem, (ColumnElement, ClauseList))
|
|
and subelem not in seen
|
|
and not isinstance(subelem, Immutable)
|
|
and subelem is not case_a[0]
|
|
)
|
|
]
|
|
stack.extend(items)
|
|
seen.update(items)
|
|
|
|
if obj is not clone:
|
|
found_elements = True
|
|
# ensure the element will not compare as true
|
|
obj.compare = lambda other, **kw: False
|
|
obj.__visit_name__ = "dont_match"
|
|
|
|
if found_elements:
|
|
assert not clone.compare(case_b[0])
|
|
assert case_a[0].compare(case_b[0])
|
|
|
|
|
|
class CompareClausesTest(fixtures.TestBase):
|
|
def test_compare_comparison_associative(self):
|
|
|
|
l1 = table_c.c.x == table_d.c.y
|
|
l2 = table_d.c.y == table_c.c.x
|
|
l3 = table_c.c.x == table_d.c.z
|
|
|
|
is_true(l1.compare(l1))
|
|
is_true(l1.compare(l2))
|
|
is_false(l1.compare(l3))
|
|
|
|
def test_compare_clauselist_associative(self):
|
|
|
|
l1 = and_(table_c.c.x == table_d.c.y, table_c.c.y == table_d.c.z)
|
|
|
|
l2 = and_(table_c.c.y == table_d.c.z, table_c.c.x == table_d.c.y)
|
|
|
|
l3 = and_(table_c.c.x == table_d.c.z, table_c.c.y == table_d.c.y)
|
|
|
|
is_true(l1.compare(l1))
|
|
is_true(l1.compare(l2))
|
|
is_false(l1.compare(l3))
|
|
|
|
def test_compare_clauselist_not_associative(self):
|
|
|
|
l1 = ClauseList(
|
|
table_c.c.x, table_c.c.y, table_d.c.y, operator=operators.sub
|
|
)
|
|
|
|
l2 = ClauseList(
|
|
table_d.c.y, table_c.c.x, table_c.c.y, operator=operators.sub
|
|
)
|
|
|
|
is_true(l1.compare(l1))
|
|
is_false(l1.compare(l2))
|
|
|
|
def test_compare_clauselist_assoc_different_operator(self):
|
|
|
|
l1 = and_(table_c.c.x == table_d.c.y, table_c.c.y == table_d.c.z)
|
|
|
|
l2 = or_(table_c.c.y == table_d.c.z, table_c.c.x == table_d.c.y)
|
|
|
|
is_false(l1.compare(l2))
|
|
|
|
def test_compare_clauselist_not_assoc_different_operator(self):
|
|
|
|
l1 = ClauseList(
|
|
table_c.c.x, table_c.c.y, table_d.c.y, operator=operators.sub
|
|
)
|
|
|
|
l2 = ClauseList(
|
|
table_c.c.x, table_c.c.y, table_d.c.y, operator=operators.div
|
|
)
|
|
|
|
is_false(l1.compare(l2))
|
|
|
|
def test_compare_labels(self):
|
|
is_true(column("q").label(None).compare(column("q").label(None)))
|
|
|
|
is_false(column("q").label("foo").compare(column("q").label(None)))
|
|
|
|
is_false(column("q").label(None).compare(column("q").label("foo")))
|
|
|
|
is_false(column("q").label("foo").compare(column("q").label("bar")))
|
|
|
|
is_true(column("q").label("foo").compare(column("q").label("foo")))
|
|
|
|
def test_compare_binds(self):
|
|
b1 = bindparam("foo", type_=Integer())
|
|
b2 = bindparam("foo", type_=Integer())
|
|
b3 = bindparam("foo", type_=String())
|
|
|
|
def c1():
|
|
return 5
|
|
|
|
def c2():
|
|
return 6
|
|
|
|
b4 = bindparam("foo", type_=Integer(), callable_=c1)
|
|
b5 = bindparam("foo", type_=Integer(), callable_=c2)
|
|
b6 = bindparam("foo", type_=Integer(), callable_=c1)
|
|
|
|
b7 = bindparam("foo", type_=Integer, value=5)
|
|
b8 = bindparam("foo", type_=Integer, value=6)
|
|
|
|
is_false(b1.compare(b4))
|
|
is_true(b4.compare(b6))
|
|
is_false(b4.compare(b5))
|
|
is_true(b1.compare(b2))
|
|
|
|
# currently not comparing "key", as we often have to compare
|
|
# anonymous names. however we should really check for that
|
|
# is_true(b1.compare(b3))
|
|
|
|
is_false(b1.compare(b3))
|
|
is_false(b1.compare(b7))
|
|
is_false(b7.compare(b8))
|
|
is_true(b7.compare(b7))
|
|
|
|
def test_compare_tables(self):
|
|
is_true(table_a.compare(table_a_2))
|
|
|
|
# the "proxy" version compares schema tables on metadata identity
|
|
is_false(table_a.compare(table_a_2, use_proxies=True))
|
|
|
|
# same for lower case tables since it compares lower case columns
|
|
# using proxies, which makes it very unlikely to have multiple
|
|
# table() objects with columns that compare equally
|
|
is_false(
|
|
table("a", column("x", Integer), column("q", String)).compare(
|
|
table("a", column("x", Integer), column("q", String)),
|
|
use_proxies=True,
|
|
)
|
|
)
|