def test_update_from_none(self):
c = SetUpdateClause('s', set((1, 2)), previous=None)
c._analyze()
c.set_context_id(0)
self.assertEqual(c._assignments, set((1, 2)))
self.assertIsNone(c._additions)
self.assertIsNone(c._removals)
self.assertEqual(c.get_context_size(), 1)
self.assertEqual(str(c), '"s" = %(0)s')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {'0': set((1, 2))})
def test_additions_and_removals(self):
c = SetUpdateClause('s', set((2, 3)), previous=set((1, 2)))
c._analyze()
c.set_context_id(0)
self.assertIsNone(c._assignments)
self.assertEqual(c._additions, set((3,)))
self.assertEqual(c._removals, set((1,)))
self.assertEqual(c.get_context_size(), 2)
self.assertEqual(str(c), '"s" = "s" + %(0)s, "s" = "s" - %(1)s')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {'0': set((3,)), '1': set((1,))})
def test_additions(self):
c = SetUpdateClause('s', {1, 2, 3}, previous={1, 2})
c._analyze()
c.set_context_id(0)
self.assertIsNone(c._assignments)
self.assertEqual(c._additions, {3})
self.assertIsNone(c._removals)
self.assertEqual(c.get_context_size(), 1)
self.assertEqual(str(c), '"s" = "s" + %(0)s')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {'0': {3}})
def test_no_update(self):
""" tests an unchanged value creates an empty update statement """
c = SetUpdateClause('s', set((1, 2)), previous=set((1, 2)))
c._analyze()
c.set_context_id(0)
self.assertIsNone(c._assignments)
self.assertIsNone(c._additions)
self.assertIsNone(c._removals)
self.assertEqual(c.get_context_size(), 0)
self.assertEqual(str(c), '')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {})
def test_null_update(self):
""" tests setting a set to None creates an empty update statement """
c = SetUpdateClause('s', None, previous={1, 2})
c._analyze()
c.set_context_id(0)
self.assertIsNone(c._assignments)
self.assertIsNone(c._additions)
self.assertIsNone(c._removals)
self.assertEqual(c.get_context_size(), 0)
self.assertEqual(str(c), '')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {})
def test_update_empty_set(self):
"""tests assigning a set to an empty set creates a nonempty
update statement and nonzero context size."""
c = SetUpdateClause(field='s', value=set())
c._analyze()
c.set_context_id(0)
self.assertEqual(c._assignments, set())
self.assertIsNone(c._additions)
self.assertIsNone(c._removals)
self.assertEqual(c.get_context_size(), 1)
self.assertEqual(str(c), '"s" = %(0)s')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {'0': set()})
def test_update_from_none(self):
c = SetUpdateClause('s', set((1, 2)), previous=None)
c._analyze()
c.set_context_id(0)
self.assertEqual(c._assignments, set((1, 2)))
self.assertIsNone(c._additions)
self.assertIsNone(c._removals)
self.assertEqual(c.get_context_size(), 1)
self.assertEqual(str(c), '"s" = %(0)s')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {'0': set((1, 2))})
def test_additions_and_removals(self):
c = SetUpdateClause('s', set((2, 3)), previous=set((1, 2)))
c._analyze()
c.set_context_id(0)
self.assertIsNone(c._assignments)
self.assertEqual(c._additions, set((3,)))
self.assertEqual(c._removals, set((1,)))
self.assertEqual(c.get_context_size(), 2)
self.assertEqual(str(c), '"s" = "s" + %(0)s, "s" = "s" - %(1)s')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {'0': set((3,)), '1': set((1,))})
def test_additions_and_removals(self):
c = SetUpdateClause("s", {2, 3}, previous={1, 2})
c._analyze()
c.set_context_id(0)
self.assertIsNone(c._assignments)
self.assertEqual(c._additions, {3})
self.assertEqual(c._removals, {1})
self.assertEqual(c.get_context_size(), 2)
self.assertEqual(str(c), '"s" = "s" + %(0)s, "s" = "s" - %(1)s')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {"0": {3}, "1": {1}})
def test_no_update(self):
""" tests an unchanged value creates an empty update statement """
c = SetUpdateClause('s', set((1, 2)), previous=set((1, 2)))
c._analyze()
c.set_context_id(0)
self.assertIsNone(c._assignments)
self.assertIsNone(c._additions)
self.assertIsNone(c._removals)
self.assertEqual(c.get_context_size(), 0)
self.assertEqual(str(c), '')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {})
def test_null_update(self):
""" tests setting a set to None creates an empty update statement """
c = SetUpdateClause("s", None, previous={1, 2})
c._analyze()
c.set_context_id(0)
self.assertIsNone(c._assignments)
self.assertIsNone(c._additions)
self.assertIsNone(c._removals)
self.assertEqual(c.get_context_size(), 0)
self.assertEqual(str(c), "")
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {})
def test_update_empty_set(self):
"""tests assigning a set to an empty set creates a nonempty
update statement and nonzero context size."""
c = SetUpdateClause(field='s', value=set())
c._analyze()
c.set_context_id(0)
self.assertEqual(c._assignments, set())
self.assertIsNone(c._additions)
self.assertIsNone(c._removals)
self.assertEqual(c.get_context_size(), 1)
self.assertEqual(str(c), '"s" = %(0)s')
ctx = {}
c.update_context(ctx)
self.assertEqual(ctx, {'0': set()})
def test_update_empty_set_removal_does_not_assign(self):
us = UpdateStatement('table')
us.add_assignment_clause(
SetUpdateClause('a', set(), operation='remove'))
self.assertEqual(six.text_type(us),
'UPDATE table SET "a" = "a" - %(0)s')
def test_update_set_add(self):
us = UpdateStatement('table')
us.add_assignment_clause(
SetUpdateClause('a', set((1, )), operation='add'))
self.assertEqual(six.text_type(us),
'UPDATE table SET "a" = "a" + %(0)s')