mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-10 10:50:37 -04:00
Mike Bayer
525 lines
22 KiB
Python
525 lines
22 KiB
Python
"""Test various algorithmic properties of selectables."""
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from sqlalchemy.test.testing import eq_, assert_raises, assert_raises_message
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from sqlalchemy import *
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from sqlalchemy.test import *
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from sqlalchemy.sql import util as sql_util, visitors
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from sqlalchemy import exc
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from sqlalchemy.sql import table, column
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from sqlalchemy import util
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metadata = MetaData()
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table1 = Table('table1', metadata,
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Column('col1', Integer, primary_key=True),
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Column('col2', String(20)),
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Column('col3', Integer),
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Column('colx', Integer),
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)
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table2 = Table('table2', metadata,
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Column('col1', Integer, primary_key=True),
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Column('col2', Integer, ForeignKey('table1.col1')),
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Column('col3', String(20)),
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Column('coly', Integer),
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)
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class SelectableTest(TestBase, AssertsExecutionResults):
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def test_distance_on_labels(self):
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# same column three times
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s = select([table1.c.col1.label('c2'), table1.c.col1, table1.c.col1.label('c1')])
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# didnt do this yet...col.label().make_proxy() has same "distance" as col.make_proxy() so far
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#assert s.corresponding_column(table1.c.col1) is s.c.col1
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assert s.corresponding_column(s.c.col1) is s.c.col1
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assert s.corresponding_column(s.c.c1) is s.c.c1
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def test_distance_on_aliases(self):
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a1 = table1.alias('a1')
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for s in (
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select([a1, table1], use_labels=True),
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select([table1, a1], use_labels=True)
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):
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assert s.corresponding_column(table1.c.col1) is s.c.table1_col1
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assert s.corresponding_column(a1.c.col1) is s.c.a1_col1
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def test_join_against_self(self):
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jj = select([table1.c.col1.label('bar_col1')])
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jjj = join(table1, jj, table1.c.col1==jj.c.bar_col1)
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# test column directly agaisnt itself
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assert jjj.corresponding_column(jjj.c.table1_col1) is jjj.c.table1_col1
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assert jjj.corresponding_column(jj.c.bar_col1) is jjj.c.bar_col1
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# test alias of the join
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j2 = jjj.alias('foo')
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assert j2.corresponding_column(table1.c.col1) is j2.c.table1_col1
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def test_select_on_table(self):
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sel = select([table1, table2], use_labels=True)
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assert sel.corresponding_column(table1.c.col1) is sel.c.table1_col1
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assert sel.corresponding_column(table1.c.col1, require_embedded=True) is sel.c.table1_col1
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assert table1.corresponding_column(sel.c.table1_col1) is table1.c.col1
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assert table1.corresponding_column(sel.c.table1_col1, require_embedded=True) is None
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def test_join_against_join(self):
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j = outerjoin(table1, table2, table1.c.col1==table2.c.col2)
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jj = select([ table1.c.col1.label('bar_col1')],from_obj=[j]).alias('foo')
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jjj = join(table1, jj, table1.c.col1==jj.c.bar_col1)
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assert jjj.corresponding_column(jjj.c.table1_col1) is jjj.c.table1_col1
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j2 = jjj.alias('foo')
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assert j2.corresponding_column(jjj.c.table1_col1) is j2.c.table1_col1
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assert jjj.corresponding_column(jj.c.bar_col1) is jj.c.bar_col1
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def test_table_alias(self):
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a = table1.alias('a')
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j = join(a, table2)
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criterion = a.c.col1 == table2.c.col2
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self.assert_(criterion.compare(j.onclause))
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def test_union(self):
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# tests that we can correspond a column in a Select statement with a certain Table, against
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# a column in a Union where one of its underlying Selects matches to that same Table
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u = select([table1.c.col1, table1.c.col2, table1.c.col3, table1.c.colx, null().label('coly')]).union(
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select([table2.c.col1, table2.c.col2, table2.c.col3, null().label('colx'), table2.c.coly])
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)
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s1 = table1.select(use_labels=True)
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s2 = table2.select(use_labels=True)
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c = u.corresponding_column(s1.c.table1_col2)
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assert u.corresponding_column(s1.c.table1_col2) is u.c.col2
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assert u.corresponding_column(s2.c.table2_col2) is u.c.col2
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def test_union_precedence(self):
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# conflicting column correspondence should be resolved based on
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# the order of the select()s in the union
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s1 = select([table1.c.col1, table1.c.col2])
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s2 = select([table1.c.col2, table1.c.col1])
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s3 = select([table1.c.col3, table1.c.colx])
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s4 = select([table1.c.colx, table1.c.col3])
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u1 = union(s1, s2)
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assert u1.corresponding_column(table1.c.col1) is u1.c.col1
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assert u1.corresponding_column(table1.c.col2) is u1.c.col2
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u1 = union(s1, s2, s3, s4)
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assert u1.corresponding_column(table1.c.col1) is u1.c.col1
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assert u1.corresponding_column(table1.c.col2) is u1.c.col2
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assert u1.corresponding_column(table1.c.colx) is u1.c.col2
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assert u1.corresponding_column(table1.c.col3) is u1.c.col1
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def test_singular_union(self):
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u = union(select([table1.c.col1, table1.c.col2, table1.c.col3]), select([table1.c.col1, table1.c.col2, table1.c.col3]))
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u = union(select([table1.c.col1, table1.c.col2, table1.c.col3]))
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assert u.c.col1
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assert u.c.col2
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assert u.c.col3
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def test_alias_union(self):
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# same as testunion, except its an alias of the union
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u = select([table1.c.col1, table1.c.col2, table1.c.col3, table1.c.colx, null().label('coly')]).union(
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select([table2.c.col1, table2.c.col2, table2.c.col3, null().label('colx'), table2.c.coly])
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).alias('analias')
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s1 = table1.select(use_labels=True)
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s2 = table2.select(use_labels=True)
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assert u.corresponding_column(s1.c.table1_col2) is u.c.col2
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assert u.corresponding_column(s2.c.table2_col2) is u.c.col2
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assert u.corresponding_column(s2.c.table2_coly) is u.c.coly
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assert s2.corresponding_column(u.c.coly) is s2.c.table2_coly
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def test_select_union(self):
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# like testaliasunion, but off a Select off the union.
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u = select([table1.c.col1, table1.c.col2, table1.c.col3, table1.c.colx, null().label('coly')]).union(
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select([table2.c.col1, table2.c.col2, table2.c.col3, null().label('colx'), table2.c.coly])
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).alias('analias')
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s = select([u])
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s1 = table1.select(use_labels=True)
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s2 = table2.select(use_labels=True)
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assert s.corresponding_column(s1.c.table1_col2) is s.c.col2
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assert s.corresponding_column(s2.c.table2_col2) is s.c.col2
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def test_union_against_join(self):
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# same as testunion, except its an alias of the union
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u = select([table1.c.col1, table1.c.col2, table1.c.col3, table1.c.colx, null().label('coly')]).union(
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select([table2.c.col1, table2.c.col2, table2.c.col3, null().label('colx'), table2.c.coly])
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).alias('analias')
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j1 = table1.join(table2)
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assert u.corresponding_column(j1.c.table1_colx) is u.c.colx
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assert j1.corresponding_column(u.c.colx) is j1.c.table1_colx
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def test_join(self):
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a = join(table1, table2)
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print str(a.select(use_labels=True))
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b = table2.alias('b')
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j = join(a, b)
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print str(j)
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criterion = a.c.table1_col1 == b.c.col2
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self.assert_(criterion.compare(j.onclause))
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def test_select_alias(self):
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a = table1.select().alias('a')
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j = join(a, table2)
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criterion = a.c.col1 == table2.c.col2
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self.assert_(criterion.compare(j.onclause))
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def test_select_labels(self):
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a = table1.select(use_labels=True)
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j = join(a, table2)
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criterion = a.c.table1_col1 == table2.c.col2
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self.assert_(criterion.compare(j.onclause))
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def test_column_labels(self):
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a = select([table1.c.col1.label('acol1'), table1.c.col2.label('acol2'), table1.c.col3.label('acol3')])
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j = join(a, table2)
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criterion = a.c.acol1 == table2.c.col2
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self.assert_(criterion.compare(j.onclause))
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def test_labeled_select_correspoinding(self):
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l1 = select([func.max(table1.c.col1)]).label('foo')
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s = select([l1])
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assert s.corresponding_column(l1).name == s.c.foo
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s = select([table1.c.col1, l1])
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assert s.corresponding_column(l1).name == s.c.foo
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def test_select_alias_labels(self):
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a = table2.select(use_labels=True).alias('a')
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j = join(a, table1)
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criterion = table1.c.col1 == a.c.table2_col2
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self.assert_(criterion.compare(j.onclause))
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def test_table_joined_to_select_of_table(self):
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metadata = MetaData()
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a = Table('a', metadata,
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Column('id', Integer, primary_key=True))
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b = Table('b', metadata,
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Column('id', Integer, primary_key=True),
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Column('aid', Integer, ForeignKey('a.id')),
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)
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j1 = a.outerjoin(b)
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j2 = select([a.c.id.label('aid')]).alias('bar')
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j3 = a.join(j2, j2.c.aid==a.c.id)
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j4 = select([j3]).alias('foo')
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assert j4.corresponding_column(j2.c.aid) is j4.c.aid
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assert j4.corresponding_column(a.c.id) is j4.c.id
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def test_two_metadata_join_raises(self):
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m = MetaData()
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m2 = MetaData()
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t1 = Table('t1', m, Column('id', Integer), Column('id2', Integer))
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t2 = Table('t2', m, Column('id', Integer, ForeignKey('t1.id')))
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t3 = Table('t3', m2, Column('id', Integer, ForeignKey('t1.id2')))
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s = select([t2, t3], use_labels=True)
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assert_raises(exc.NoReferencedTableError, s.join, t1)
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class PrimaryKeyTest(TestBase, AssertsExecutionResults):
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def test_join_pk_collapse_implicit(self):
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"""test that redundant columns in a join get 'collapsed' into a minimal primary key,
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which is the root column along a chain of foreign key relationships."""
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meta = MetaData()
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a = Table('a', meta, Column('id', Integer, primary_key=True))
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b = Table('b', meta, Column('id', Integer, ForeignKey('a.id'), primary_key=True))
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c = Table('c', meta, Column('id', Integer, ForeignKey('b.id'), primary_key=True))
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d = Table('d', meta, Column('id', Integer, ForeignKey('c.id'), primary_key=True))
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assert c.c.id.references(b.c.id)
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assert not d.c.id.references(a.c.id)
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assert list(a.join(b).primary_key) == [a.c.id]
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assert list(b.join(c).primary_key) == [b.c.id]
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assert list(a.join(b).join(c).primary_key) == [a.c.id]
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assert list(b.join(c).join(d).primary_key) == [b.c.id]
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assert list(d.join(c).join(b).primary_key) == [b.c.id]
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assert list(a.join(b).join(c).join(d).primary_key) == [a.c.id]
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def test_join_pk_collapse_explicit(self):
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"""test that redundant columns in a join get 'collapsed' into a minimal primary key,
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which is the root column along a chain of explicit join conditions."""
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meta = MetaData()
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a = Table('a', meta, Column('id', Integer, primary_key=True), Column('x', Integer))
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b = Table('b', meta, Column('id', Integer, ForeignKey('a.id'), primary_key=True), Column('x', Integer))
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c = Table('c', meta, Column('id', Integer, ForeignKey('b.id'), primary_key=True), Column('x', Integer))
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d = Table('d', meta, Column('id', Integer, ForeignKey('c.id'), primary_key=True), Column('x', Integer))
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print list(a.join(b, a.c.x==b.c.id).primary_key)
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assert list(a.join(b, a.c.x==b.c.id).primary_key) == [b.c.id]
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assert list(b.join(c, b.c.x==c.c.id).primary_key) == [b.c.id]
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assert list(a.join(b).join(c, c.c.id==b.c.x).primary_key) == [a.c.id]
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assert list(b.join(c, c.c.x==b.c.id).join(d).primary_key) == [c.c.id]
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assert list(b.join(c, c.c.id==b.c.x).join(d).primary_key) == [b.c.id]
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assert list(d.join(b, d.c.id==b.c.id).join(c, b.c.id==c.c.x).primary_key) == [c.c.id]
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assert list(a.join(b).join(c, c.c.id==b.c.x).join(d).primary_key) == [a.c.id]
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assert list(a.join(b, and_(a.c.id==b.c.id, a.c.x==b.c.id)).primary_key) == [a.c.id]
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def test_init_doesnt_blowitaway(self):
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meta = MetaData()
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a = Table('a', meta, Column('id', Integer, primary_key=True), Column('x', Integer))
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b = Table('b', meta, Column('id', Integer, ForeignKey('a.id'), primary_key=True), Column('x', Integer))
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j = a.join(b)
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assert list(j.primary_key) == [a.c.id]
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j.foreign_keys
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assert list(j.primary_key) == [a.c.id]
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def test_non_column_clause(self):
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meta = MetaData()
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a = Table('a', meta, Column('id', Integer, primary_key=True), Column('x', Integer))
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b = Table('b', meta, Column('id', Integer, ForeignKey('a.id'), primary_key=True), Column('x', Integer, primary_key=True))
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j = a.join(b, and_(a.c.id==b.c.id, b.c.x==5))
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assert str(j) == "a JOIN b ON a.id = b.id AND b.x = :x_1", str(j)
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assert list(j.primary_key) == [a.c.id, b.c.x]
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def test_onclause_direction(self):
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metadata = MetaData()
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employee = Table( 'Employee', metadata,
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Column('name', String(100)),
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Column('id', Integer, primary_key= True),
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)
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engineer = Table( 'Engineer', metadata,
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Column('id', Integer, ForeignKey( 'Employee.id', ), primary_key=True),
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)
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eq_(
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util.column_set(employee.join(engineer, employee.c.id==engineer.c.id).primary_key),
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util.column_set([employee.c.id])
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)
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eq_(
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util.column_set(employee.join(engineer, engineer.c.id==employee.c.id).primary_key),
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util.column_set([employee.c.id])
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)
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class ReduceTest(TestBase, AssertsExecutionResults):
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def test_reduce(self):
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meta = MetaData()
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t1 = Table('t1', meta,
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Column('t1id', Integer, primary_key=True),
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Column('t1data', String(30)))
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t2 = Table('t2', meta,
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Column('t2id', Integer, ForeignKey('t1.t1id'), primary_key=True),
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Column('t2data', String(30)))
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t3 = Table('t3', meta,
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Column('t3id', Integer, ForeignKey('t2.t2id'), primary_key=True),
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Column('t3data', String(30)))
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eq_(
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util.column_set(sql_util.reduce_columns([t1.c.t1id, t1.c.t1data, t2.c.t2id, t2.c.t2data, t3.c.t3id, t3.c.t3data])),
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util.column_set([t1.c.t1id, t1.c.t1data, t2.c.t2data, t3.c.t3data])
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)
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def test_reduce_selectable(self):
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metadata = MetaData()
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engineers = Table('engineers', metadata,
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Column('engineer_id', Integer, primary_key=True),
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Column('engineer_name', String(50)),
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)
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managers = Table('managers', metadata,
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Column('manager_id', Integer, primary_key=True),
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Column('manager_name', String(50))
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)
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s = select([engineers, managers]).where(engineers.c.engineer_name==managers.c.manager_name)
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eq_(util.column_set(sql_util.reduce_columns(list(s.c), s)),
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util.column_set([s.c.engineer_id, s.c.engineer_name, s.c.manager_id])
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)
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def test_reduce_aliased_join(self):
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metadata = MetaData()
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people = Table('people', metadata,
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Column('person_id', Integer, Sequence('person_id_seq', optional=True), primary_key=True),
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Column('name', String(50)),
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Column('type', String(30)))
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engineers = Table('engineers', metadata,
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Column('person_id', Integer, ForeignKey('people.person_id'), primary_key=True),
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Column('status', String(30)),
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Column('engineer_name', String(50)),
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Column('primary_language', String(50)),
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)
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managers = Table('managers', metadata,
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Column('person_id', Integer, ForeignKey('people.person_id'), primary_key=True),
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Column('status', String(30)),
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Column('manager_name', String(50))
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)
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pjoin = people.outerjoin(engineers).outerjoin(managers).select(use_labels=True).alias('pjoin')
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eq_(
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util.column_set(sql_util.reduce_columns([pjoin.c.people_person_id, pjoin.c.engineers_person_id, pjoin.c.managers_person_id])),
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util.column_set([pjoin.c.people_person_id])
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)
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def test_reduce_aliased_union(self):
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metadata = MetaData()
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item_table = Table(
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'item', metadata,
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Column('id', Integer, ForeignKey('base_item.id'), primary_key=True),
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Column('dummy', Integer, default=0))
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base_item_table = Table(
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'base_item', metadata,
|
|
Column('id', Integer, primary_key=True),
|
|
Column('child_name', String(255), default=None))
|
|
|
|
from sqlalchemy.orm.util import polymorphic_union
|
|
|
|
item_join = polymorphic_union( {
|
|
'BaseItem':base_item_table.select(base_item_table.c.child_name=='BaseItem'),
|
|
'Item':base_item_table.join(item_table),
|
|
}, None, 'item_join')
|
|
|
|
eq_(
|
|
util.column_set(sql_util.reduce_columns([item_join.c.id, item_join.c.dummy, item_join.c.child_name])),
|
|
util.column_set([item_join.c.id, item_join.c.dummy, item_join.c.child_name])
|
|
)
|
|
|
|
def test_reduce_aliased_union_2(self):
|
|
metadata = MetaData()
|
|
|
|
page_table = Table('page', metadata,
|
|
Column('id', Integer, primary_key=True),
|
|
)
|
|
magazine_page_table = Table('magazine_page', metadata,
|
|
Column('page_id', Integer, ForeignKey('page.id'), primary_key=True),
|
|
)
|
|
classified_page_table = Table('classified_page', metadata,
|
|
Column('magazine_page_id', Integer, ForeignKey('magazine_page.page_id'), primary_key=True),
|
|
)
|
|
|
|
from sqlalchemy.orm.util import polymorphic_union
|
|
pjoin = polymorphic_union(
|
|
{
|
|
'm': page_table.join(magazine_page_table),
|
|
'c': page_table.join(magazine_page_table).join(classified_page_table),
|
|
}, None, 'page_join')
|
|
|
|
eq_(
|
|
util.column_set(sql_util.reduce_columns([pjoin.c.id, pjoin.c.page_id, pjoin.c.magazine_page_id])),
|
|
util.column_set([pjoin.c.id])
|
|
)
|
|
|
|
|
|
class DerivedTest(TestBase, AssertsExecutionResults):
|
|
def test_table(self):
|
|
meta = MetaData()
|
|
t1 = Table('t1', meta, Column('c1', Integer, primary_key=True), Column('c2', String(30)))
|
|
t2 = Table('t2', meta, Column('c1', Integer, primary_key=True), Column('c2', String(30)))
|
|
|
|
assert t1.is_derived_from(t1)
|
|
assert not t2.is_derived_from(t1)
|
|
|
|
def test_alias(self):
|
|
meta = MetaData()
|
|
t1 = Table('t1', meta, Column('c1', Integer, primary_key=True), Column('c2', String(30)))
|
|
t2 = Table('t2', meta, Column('c1', Integer, primary_key=True), Column('c2', String(30)))
|
|
|
|
assert t1.alias().is_derived_from(t1)
|
|
assert not t2.alias().is_derived_from(t1)
|
|
assert not t1.is_derived_from(t1.alias())
|
|
assert not t1.is_derived_from(t2.alias())
|
|
|
|
def test_select(self):
|
|
meta = MetaData()
|
|
t1 = Table('t1', meta, Column('c1', Integer, primary_key=True), Column('c2', String(30)))
|
|
t2 = Table('t2', meta, Column('c1', Integer, primary_key=True), Column('c2', String(30)))
|
|
|
|
assert t1.select().is_derived_from(t1)
|
|
assert not t2.select().is_derived_from(t1)
|
|
|
|
assert select([t1, t2]).is_derived_from(t1)
|
|
|
|
assert t1.select().alias('foo').is_derived_from(t1)
|
|
assert select([t1, t2]).alias('foo').is_derived_from(t1)
|
|
assert not t2.select().alias('foo').is_derived_from(t1)
|
|
|
|
class AnnotationsTest(TestBase):
|
|
def test_annotated_corresponding_column(self):
|
|
table1 = table('table1', column("col1"))
|
|
|
|
s1 = select([table1.c.col1])
|
|
t1 = s1._annotate({})
|
|
t2 = s1
|
|
|
|
# t1 needs to share the same _make_proxy() columns as t2, even though it's
|
|
# annotated. otherwise paths will diverge once they are corresponded against "inner" below.
|
|
assert t1.c is t2.c
|
|
assert t1.c.col1 is t2.c.col1
|
|
|
|
inner = select([s1])
|
|
assert inner.corresponding_column(t2.c.col1, require_embedded=False) is inner.corresponding_column(t2.c.col1, require_embedded=True) is inner.c.col1
|
|
assert inner.corresponding_column(t1.c.col1, require_embedded=False) is inner.corresponding_column(t1.c.col1, require_embedded=True) is inner.c.col1
|
|
|
|
def test_annotated_visit(self):
|
|
table1 = table('table1', column("col1"), column("col2"))
|
|
|
|
bin = table1.c.col1 == bindparam('foo', value=None)
|
|
assert str(bin) == "table1.col1 = :foo"
|
|
def visit_binary(b):
|
|
b.right = table1.c.col2
|
|
|
|
b2 = visitors.cloned_traverse(bin, {}, {'binary':visit_binary})
|
|
assert str(b2) == "table1.col1 = table1.col2"
|
|
|
|
b3 = visitors.cloned_traverse(bin._annotate({}), {}, {'binary':visit_binary})
|
|
assert str(b3) == "table1.col1 = table1.col2"
|
|
|
|
def visit_binary(b):
|
|
b.left = bindparam('bar')
|
|
|
|
b4 = visitors.cloned_traverse(b2, {}, {'binary':visit_binary})
|
|
assert str(b4) == ":bar = table1.col2"
|
|
|
|
b5 = visitors.cloned_traverse(b3, {}, {'binary':visit_binary})
|
|
assert str(b5) == ":bar = table1.col2"
|
|
|
|
def test_deannotate(self):
|
|
table1 = table('table1', column("col1"), column("col2"))
|
|
|
|
bin = table1.c.col1 == bindparam('foo', value=None)
|
|
|
|
b2 = sql_util._deep_annotate(bin, {'_orm_adapt':True})
|
|
b3 = sql_util._deep_deannotate(b2)
|
|
b4 = sql_util._deep_deannotate(bin)
|
|
|
|
for elem in (b2._annotations, b2.left._annotations):
|
|
assert '_orm_adapt' in elem
|
|
|
|
for elem in (b3._annotations, b3.left._annotations, b4._annotations, b4.left._annotations):
|
|
assert elem == {}
|
|
|
|
assert b2.left is not bin.left
|
|
assert b3.left is not b2.left is not bin.left
|
|
assert b4.left is bin.left # since column is immutable
|
|
assert b4.right is not bin.right is not b2.right is not b3.right
|
|
|