mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-11 03:10:38 -04:00
Mike Bayer
138 lines
5.2 KiB
Python
Executable File
138 lines
5.2 KiB
Python
Executable File
"""tests that various From objects properly export their columns, as well as useable primary keys
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and foreign keys. Full relational algebra depends on every selectable unit behaving
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nicely with others.."""
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import testbase
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import unittest, sys, datetime
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db = testbase.db
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from sqlalchemy import *
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table = Table('table1', db,
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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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redefine=True
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)
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table2 = Table('table2', db,
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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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redefine=True
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)
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class SelectableTest(testbase.AssertMixin):
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def testtablealias(self):
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a = table.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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print
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print str(j)
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self.assert_(criterion.compare(j.onclause))
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def testunion(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([table.c.col1, table.c.col2, table.c.col3, table.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 = table.select(use_labels=True)
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s2 = table2.select(use_labels=True)
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print ["%d %s" % (id(c),c.key) for c in u.c]
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c = u.corresponding_column(s1.c.table1_col2)
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print "%d %s" % (id(c), c.key)
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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 testaliasunion(self):
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# same as testunion, except its an alias of the union
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u = select([table.c.col1, table.c.col2, table.c.col3, table.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 = table.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 testselectunion(self):
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# like testaliasunion, but off a Select off the union.
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u = select([table.c.col1, table.c.col2, table.c.col3, table.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 = table.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 testunionagainstjoin(self):
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# same as testunion, except its an alias of the union
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u = select([table.c.col1, table.c.col2, table.c.col3, table.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 = table.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 testjoin(self):
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a = join(table, 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 testselectalias(self):
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a = table.select().alias('a')
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print str(a.select())
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j = join(a, table2)
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criterion = a.c.col1 == table2.c.col2
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print
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print str(j)
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self.assert_(criterion.compare(j.onclause))
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def testselectlabels(self):
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a = table.select(use_labels=True)
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print str(a.select())
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j = join(a, table2)
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criterion = a.c.table1_col1 == table2.c.col2
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print
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print str(j)
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self.assert_(criterion.compare(j.onclause))
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def testcolumnlabels(self):
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a = select([table.c.col1.label('acol1'), table.c.col2.label('acol2'), table.c.col3.label('acol3')])
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print str(a)
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print [c for c in a.columns]
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print str(a.select())
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j = join(a, table2)
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criterion = a.c.acol1 == table2.c.col2
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print str(j)
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self.assert_(criterion.compare(j.onclause))
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def testselectaliaslabels(self):
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a = table2.select(use_labels=True).alias('a')
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print str(a.select())
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j = join(a, table)
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criterion = table.c.col1 == a.c.table2_col2
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print str(criterion)
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print str(j.onclause)
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self.assert_(criterion.compare(j.onclause))
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if __name__ == "__main__":
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testbase.main()
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