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from sqlalchemy.testing import fixtures
from sqlalchemy.testing import AssertsCompiledSQL, assert_raises_message
from sqlalchemy.sql import table, column, select, func, literal
from sqlalchemy.dialects import mssql
from sqlalchemy.engine import default
from sqlalchemy.exc import CompileError
class CTETest(fixtures.TestBase, AssertsCompiledSQL):
__dialect__ = 'default'
def test_nonrecursive(self):
orders = table('orders',
column('region'),
column('amount'),
column('product'),
column('quantity')
)
regional_sales = select([
orders.c.region,
func.sum(orders.c.amount).label('total_sales')
]).group_by(orders.c.region).cte("regional_sales")
top_regions = select([regional_sales.c.region]).\
where(
regional_sales.c.total_sales > select([
func.sum(regional_sales.c.total_sales) / 10
])
).cte("top_regions")
s = select([
orders.c.region,
orders.c.product,
func.sum(orders.c.quantity).label("product_units"),
func.sum(orders.c.amount).label("product_sales")
]).where(orders.c.region.in_(
select([top_regions.c.region])
)).group_by(orders.c.region, orders.c.product)
# needs to render regional_sales first as top_regions
# refers to it
self.assert_compile(
s,
"WITH regional_sales AS (SELECT orders.region AS region, "
"sum(orders.amount) AS total_sales FROM orders "
"GROUP BY orders.region), "
"top_regions AS (SELECT "
"regional_sales.region AS region FROM regional_sales "
"WHERE regional_sales.total_sales > "
"(SELECT sum(regional_sales.total_sales) / :sum_1 AS "
"anon_1 FROM regional_sales)) "
"SELECT orders.region, orders.product, "
"sum(orders.quantity) AS product_units, "
"sum(orders.amount) AS product_sales "
"FROM orders WHERE orders.region "
"IN (SELECT top_regions.region FROM top_regions) "
"GROUP BY orders.region, orders.product"
)
def test_recursive(self):
parts = table('parts',
column('part'),
column('sub_part'),
column('quantity'),
)
included_parts = select([
parts.c.sub_part,
parts.c.part,
parts.c.quantity]).\
where(parts.c.part == 'our part').\
cte(recursive=True)
incl_alias = included_parts.alias()
parts_alias = parts.alias()
included_parts = included_parts.union(
select([
parts_alias.c.sub_part,
parts_alias.c.part,
parts_alias.c.quantity]).
where(parts_alias.c.part == incl_alias.c.sub_part)
)
s = select([
included_parts.c.sub_part,
func.sum(included_parts.c.quantity).label('total_quantity')]).\
select_from(included_parts.join(
parts, included_parts.c.part == parts.c.part)).\
group_by(included_parts.c.sub_part)
self.assert_compile(
s, "WITH RECURSIVE anon_1(sub_part, part, quantity) "
"AS (SELECT parts.sub_part AS sub_part, parts.part "
"AS part, parts.quantity AS quantity FROM parts "
"WHERE parts.part = :part_1 UNION "
"SELECT parts_1.sub_part AS sub_part, "
"parts_1.part AS part, parts_1.quantity "
"AS quantity FROM parts AS parts_1, anon_1 AS anon_2 "
"WHERE parts_1.part = anon_2.sub_part) "
"SELECT anon_1.sub_part, "
"sum(anon_1.quantity) AS total_quantity FROM anon_1 "
"JOIN parts ON anon_1.part = parts.part "
"GROUP BY anon_1.sub_part")
# quick check that the "WITH RECURSIVE" varies per
# dialect
self.assert_compile(
s, "WITH anon_1(sub_part, part, quantity) "
"AS (SELECT parts.sub_part AS sub_part, parts.part "
"AS part, parts.quantity AS quantity FROM parts "
"WHERE parts.part = :part_1 UNION "
"SELECT parts_1.sub_part AS sub_part, "
"parts_1.part AS part, parts_1.quantity "
"AS quantity FROM parts AS parts_1, anon_1 AS anon_2 "
"WHERE parts_1.part = anon_2.sub_part) "
"SELECT anon_1.sub_part, "
"sum(anon_1.quantity) AS total_quantity FROM anon_1 "
"JOIN parts ON anon_1.part = parts.part "
"GROUP BY anon_1.sub_part", dialect=mssql.dialect())
def test_recursive_union_no_alias_one(self):
s1 = select([literal(0).label("x")])
cte = s1.cte(name="cte", recursive=True)
cte = cte.union_all(
select([cte.c.x + 1]).where(cte.c.x < 10)
)
s2 = select([cte])
self.assert_compile(s2,
"WITH RECURSIVE cte(x) AS "
"(SELECT :param_1 AS x UNION ALL "
"SELECT cte.x + :x_1 AS anon_1 "
"FROM cte WHERE cte.x < :x_2) "
"SELECT cte.x FROM cte"
)
def test_recursive_union_no_alias_two(self):
"""
pg's example:
WITH RECURSIVE t(n) AS (
VALUES (1)
UNION ALL
SELECT n+1 FROM t WHERE n < 100
)
SELECT sum(n) FROM t;
"""
# I know, this is the PG VALUES keyword,
# we're cheating here. also yes we need the SELECT,
# sorry PG.
t = select([func.values(1).label("n")]).cte("t", recursive=True)
t = t.union_all(select([t.c.n + 1]).where(t.c.n < 100))
s = select([func.sum(t.c.n)])
self.assert_compile(s,
"WITH RECURSIVE t(n) AS "
"(SELECT values(:values_1) AS n "
"UNION ALL SELECT t.n + :n_1 AS anon_1 "
"FROM t "
"WHERE t.n < :n_2) "
"SELECT sum(t.n) AS sum_1 FROM t"
)
def test_recursive_union_no_alias_three(self):
# like test one, but let's refer to the CTE
# in a sibling CTE.
s1 = select([literal(0).label("x")])
cte = s1.cte(name="cte", recursive=True)
# can't do it here...
#bar = select([cte]).cte('bar')
cte = cte.union_all(
select([cte.c.x + 1]).where(cte.c.x < 10)
)
bar = select([cte]).cte('bar')
s2 = select([cte, bar])
self.assert_compile(s2,
"WITH RECURSIVE cte(x) AS "
"(SELECT :param_1 AS x UNION ALL "
"SELECT cte.x + :x_1 AS anon_1 "
"FROM cte WHERE cte.x < :x_2), "
"bar AS (SELECT cte.x AS x FROM cte) "
"SELECT cte.x, bar.x FROM cte, bar"
)
def test_recursive_union_no_alias_four(self):
# like test one and three, but let's refer
# previous version of "cte". here we test
# how the compiler resolves multiple instances
# of "cte".
s1 = select([literal(0).label("x")])
cte = s1.cte(name="cte", recursive=True)
bar = select([cte]).cte('bar')
cte = cte.union_all(
select([cte.c.x + 1]).where(cte.c.x < 10)
)
# outer cte rendered first, then bar, which
# includes "inner" cte
s2 = select([cte, bar])
self.assert_compile(s2,
"WITH RECURSIVE cte(x) AS "
"(SELECT :param_1 AS x UNION ALL "
"SELECT cte.x + :x_1 AS anon_1 "
"FROM cte WHERE cte.x < :x_2), "
"bar AS (SELECT cte.x AS x FROM cte) "
"SELECT cte.x, bar.x FROM cte, bar"
)
# bar rendered, only includes "inner" cte,
# "outer" cte isn't present
s2 = select([bar])
self.assert_compile(s2,
"WITH RECURSIVE cte(x) AS "
"(SELECT :param_1 AS x), "
"bar AS (SELECT cte.x AS x FROM cte) "
"SELECT bar.x FROM bar"
)
# bar rendered, but then the "outer"
# cte is rendered.
s2 = select([bar, cte])
self.assert_compile(
s2, "WITH RECURSIVE bar AS (SELECT cte.x AS x FROM cte), "
"cte(x) AS "
"(SELECT :param_1 AS x UNION ALL "
"SELECT cte.x + :x_1 AS anon_1 "
"FROM cte WHERE cte.x < :x_2) "
"SELECT bar.x, cte.x FROM bar, cte")
def test_conflicting_names(self):
"""test a flat out name conflict."""
s1 = select([1])
c1 = s1.cte(name='cte1', recursive=True)
s2 = select([1])
c2 = s2.cte(name='cte1', recursive=True)
s = select([c1, c2])
assert_raises_message(
CompileError,
"Multiple, unrelated CTEs found "
"with the same name: 'cte1'",
s.compile
)
def test_union(self):
orders = table('orders',
column('region'),
column('amount'),
)
regional_sales = select([
orders.c.region,
orders.c.amount
]).cte("regional_sales")
s = select(
[regional_sales.c.region]).where(
regional_sales.c.amount > 500
)
self.assert_compile(s,
"WITH regional_sales AS "
"(SELECT orders.region AS region, "
"orders.amount AS amount FROM orders) "
"SELECT regional_sales.region "
"FROM regional_sales WHERE "
"regional_sales.amount > :amount_1")
s = s.union_all(
select([regional_sales.c.region]).
where(
regional_sales.c.amount < 300
)
)
self.assert_compile(s,
"WITH regional_sales AS "
"(SELECT orders.region AS region, "
"orders.amount AS amount FROM orders) "
"SELECT regional_sales.region FROM regional_sales "
"WHERE regional_sales.amount > :amount_1 "
"UNION ALL SELECT regional_sales.region "
"FROM regional_sales WHERE "
"regional_sales.amount < :amount_2")
def test_reserved_quote(self):
orders = table('orders',
column('order'),
)
s = select([orders.c.order]).cte("regional_sales", recursive=True)
s = select([s.c.order])
self.assert_compile(s,
'WITH RECURSIVE regional_sales("order") AS '
'(SELECT orders."order" AS "order" '
"FROM orders)"
' SELECT regional_sales."order" '
"FROM regional_sales"
)
def test_multi_subq_quote(self):
cte = select([literal(1).label("id")]).cte(name='CTE')
s1 = select([cte.c.id]).alias()
s2 = select([cte.c.id]).alias()
s = select([s1, s2])
self.assert_compile(
s,
'WITH "CTE" AS (SELECT :param_1 AS id) '
'SELECT anon_1.id, anon_2.id FROM '
'(SELECT "CTE".id AS id FROM "CTE") AS anon_1, '
'(SELECT "CTE".id AS id FROM "CTE") AS anon_2'
)
def test_positional_binds(self):
orders = table('orders',
column('order'),
)
s = select([orders.c.order, literal("x")]).cte("regional_sales")
s = select([s.c.order, literal("y")])
dialect = default.DefaultDialect()
dialect.positional = True
dialect.paramstyle = 'numeric'
self.assert_compile(
s,
'WITH regional_sales AS (SELECT orders."order" '
'AS "order", :1 AS anon_2 FROM orders) SELECT '
'regional_sales."order", :2 AS anon_1 FROM regional_sales',
checkpositional=(
'x',
'y'),
dialect=dialect)
self.assert_compile(
s.union(s), 'WITH regional_sales AS (SELECT orders."order" '
'AS "order", :1 AS anon_2 FROM orders) SELECT '
'regional_sales."order", :2 AS anon_1 FROM regional_sales '
'UNION SELECT regional_sales."order", :3 AS anon_1 '
'FROM regional_sales', checkpositional=(
'x', 'y', 'y'), dialect=dialect)
s = select([orders.c.order]).\
where(orders.c.order == 'x').cte("regional_sales")
s = select([s.c.order]).where(s.c.order == "y")
self.assert_compile(
s, 'WITH regional_sales AS (SELECT orders."order" AS '
'"order" FROM orders WHERE orders."order" = :1) '
'SELECT regional_sales."order" FROM regional_sales '
'WHERE regional_sales."order" = :2', checkpositional=(
'x', 'y'), dialect=dialect)
def test_positional_binds_2(self):
orders = table('orders',
column('order'),
)
s = select([orders.c.order, literal("x")]).cte("regional_sales")
s = select([s.c.order, literal("y")])
dialect = default.DefaultDialect()
dialect.positional = True
dialect.paramstyle = 'numeric'
s1 = select([orders.c.order]).where(orders.c.order == 'x').\
cte("regional_sales_1")
s1a = s1.alias()
s2 = select([orders.c.order == 'y', s1a.c.order,
orders.c.order, s1.c.order]).\
where(orders.c.order == 'z').\
cte("regional_sales_2")
s3 = select([s2])
self.assert_compile(
s3,
'WITH regional_sales_1 AS (SELECT orders."order" AS "order" '
'FROM orders WHERE orders."order" = :1), regional_sales_2 AS '
'(SELECT orders."order" = :2 AS anon_1, '
'anon_2."order" AS "order", '
'orders."order" AS "order", '
'regional_sales_1."order" AS "order" FROM orders, '
'regional_sales_1 '
'AS anon_2, regional_sales_1 '
'WHERE orders."order" = :3) SELECT regional_sales_2.anon_1, '
'regional_sales_2."order" FROM regional_sales_2',
checkpositional=('x', 'y', 'z'), dialect=dialect)
def test_positional_binds_2_asliteral(self):
orders = table('orders',
column('order'),
)
s = select([orders.c.order, literal("x")]).cte("regional_sales")
s = select([s.c.order, literal("y")])
dialect = default.DefaultDialect()
dialect.positional = True
dialect.paramstyle = 'numeric'
s1 = select([orders.c.order]).where(orders.c.order == 'x').\
cte("regional_sales_1")
s1a = s1.alias()
s2 = select([orders.c.order == 'y', s1a.c.order,
orders.c.order, s1.c.order]).\
where(orders.c.order == 'z').\
cte("regional_sales_2")
s3 = select([s2])
self.assert_compile(
s3,
'WITH regional_sales_1 AS '
'(SELECT orders."order" AS "order" '
'FROM orders '
'WHERE orders."order" = \'x\'), '
'regional_sales_2 AS '
'(SELECT orders."order" = \'y\' AS anon_1, '
'anon_2."order" AS "order", orders."order" AS "order", '
'regional_sales_1."order" AS "order" '
'FROM orders, regional_sales_1 AS anon_2, regional_sales_1 '
'WHERE orders."order" = \'z\') '
'SELECT regional_sales_2.anon_1, regional_sales_2."order" '
'FROM regional_sales_2',
checkpositional=(), dialect=dialect,
literal_binds=True)
def test_all_aliases(self):
orders = table('order', column('order'))
s = select([orders.c.order]).cte("regional_sales")
r1 = s.alias()
r2 = s.alias()
s2 = select([r1, r2]).where(r1.c.order > r2.c.order)
self.assert_compile(
s2,
'WITH regional_sales AS (SELECT "order"."order" '
'AS "order" FROM "order") '
'SELECT anon_1."order", anon_2."order" '
'FROM regional_sales AS anon_1, '
'regional_sales AS anon_2 WHERE anon_1."order" > anon_2."order"'
)
s3 = select(
[orders]).select_from(
orders.join(
r1,
r1.c.order == orders.c.order))
self.assert_compile(
s3,
'WITH regional_sales AS '
'(SELECT "order"."order" AS "order" '
'FROM "order")'
' SELECT "order"."order" '
'FROM "order" JOIN regional_sales AS anon_1 '
'ON anon_1."order" = "order"."order"'
)
def test_suffixes(self):
orders = table('order', column('order'))
s = select([orders.c.order]).cte("regional_sales")
s = s.suffix_with("pg suffix", dialect='postgresql')
s = s.suffix_with('oracle suffix', dialect='oracle')
stmt = select([orders]).where(orders.c.order > s.c.order)
self.assert_compile(
stmt,
'WITH regional_sales AS (SELECT "order"."order" AS "order" '
'FROM "order") SELECT "order"."order" FROM "order", '
'regional_sales WHERE "order"."order" > regional_sales."order"'
)
self.assert_compile(
stmt,
'WITH regional_sales AS (SELECT "order"."order" AS "order" '
'FROM "order") oracle suffix SELECT "order"."order" FROM "order", '
'regional_sales WHERE "order"."order" > regional_sales."order"',
dialect='oracle'
)
self.assert_compile(
stmt,
'WITH regional_sales AS (SELECT "order"."order" AS "order" '
'FROM "order") pg suffix SELECT "order"."order" FROM "order", '
'regional_sales WHERE "order"."order" > regional_sales."order"',
dialect='postgresql'
)
|
