def update(self):
"""
updates a row.
This is a blind update call.
All validation and cleaning needs to happen
prior to calling this.
"""
if self.instance is None:
raise CQLEngineException("DML Query intance attribute is None")
assert type(self.instance) == self.model
static_update_only = True
statement = UpdateStatement(self.column_family_name, ttl=self._ttl,
timestamp=self._timestamp, transactions=self._transaction)
#get defined fields and their column names
for name, col in self.model._columns.items():
if not col.is_primary_key:
val = getattr(self.instance, name, None)
val_mgr = self.instance._values[name]
# don't update something that is null
if val is None:
continue
# don't update something if it hasn't changed
if not val_mgr.changed and not isinstance(col, Counter):
continue
static_update_only = (static_update_only and col.static)
if isinstance(col, (BaseContainerColumn, Counter)):
# get appropriate clause
if isinstance(col, List): klass = ListUpdateClause
elif isinstance(col, Map): klass = MapUpdateClause
elif isinstance(col, Set): klass = SetUpdateClause
elif isinstance(col, Counter): klass = CounterUpdateClause
else: raise RuntimeError
# do the stuff
clause = klass(col.db_field_name, val,
previous=val_mgr.previous_value, column=col)
if clause.get_context_size() > 0:
statement.add_assignment_clause(clause)
else:
statement.add_assignment_clause(AssignmentClause(
col.db_field_name,
col.to_database(val)
))
if statement.get_context_size() > 0 or self.instance._has_counter:
for name, col in self.model._primary_keys.items():
if static_update_only and (not col.partition_key):
continue
statement.add_where_clause(WhereClause(
col.db_field_name,
EqualsOperator(),
col.to_database(getattr(self.instance, name))
))
self._execute(statement)
self._delete_null_columns()
def filter(self, *args, **kwargs):
"""
Adds WHERE arguments to the queryset, returning a new queryset
#TODO: show examples
:rtype: AbstractQuerySet
"""
#add arguments to the where clause filters
if len([x for x in kwargs.values() if x is None]):
raise CQLEngineException("None values on filter are not allowed")
clone = copy.deepcopy(self)
for operator in args:
if not isinstance(operator, WhereClause):
raise QueryException('{} is not a valid query operator'.format(operator))
clone._where.append(operator)
for arg, val in kwargs.items():
col_name, col_op = self._parse_filter_arg(arg)
quote_field = True
#resolve column and operator
try:
column = self.model._get_column(col_name)
except KeyError:
if col_name == 'pk__token':
if not isinstance(val, Token):
raise QueryException("Virtual column 'pk__token' may only be compared to Token() values")
column = columns._PartitionKeysToken(self.model)
quote_field = False
else:
raise QueryException("Can't resolve column name: '{}'".format(col_name))
if isinstance(val, Token):
if col_name != 'pk__token':
raise QueryException("Token() values may only be compared to the 'pk__token' virtual column")
partition_columns = column.partition_columns
if len(partition_columns) != len(val.value):
raise QueryException(
'Token() received {} arguments but model has {} partition keys'.format(
len(val.value), len(partition_columns)))
val.set_columns(partition_columns)
#get query operator, or use equals if not supplied
operator_class = BaseWhereOperator.get_operator(col_op or 'EQ')
operator = operator_class()
if isinstance(operator, InOperator):
if not isinstance(val, (list, tuple)):
raise QueryException('IN queries must use a list/tuple value')
query_val = [column.to_database(v) for v in val]
elif isinstance(val, BaseQueryFunction):
query_val = val
else:
query_val = column.to_database(val)
clone._where.append(WhereClause(column.db_field_name, operator, query_val, quote_field=quote_field))
return clone
def test_count(self):
ss = SelectStatement('table', count=True, limit=10, order_by='d')
ss.add_where_clause(WhereClause('a', EqualsOperator(), 'b'))
self.assertEqual(
six.text_type(ss),
'SELECT COUNT(*) FROM table WHERE "a" = %(0)s LIMIT 10',
six.text_type(ss))
self.assertIn('LIMIT', six.text_type(ss))
self.assertNotIn('ORDER', six.text_type(ss))
def test_context_update(self):
ds = DeleteStatement('table', None)
ds.add_field(MapDeleteClause('d', {1: 2}, {1: 2, 3: 4}))
ds.add_where_clause(WhereClause('a', EqualsOperator(), 'b'))
ds.update_context_id(7)
self.assertEqual(six.text_type(ds),
'DELETE "d"[%(8)s] FROM table WHERE "a" = %(7)s')
self.assertEqual(ds.get_context(), {'7': 'b', '8': 3})
def test_rendering(self):
us = UpdateStatement('table')
us.add_assignment_clause(AssignmentClause('a', 'b'))
us.add_assignment_clause(AssignmentClause('c', 'd'))
us.add_where_clause(WhereClause('a', EqualsOperator(), 'x'))
self.assertEqual(
six.text_type(us),
'UPDATE table SET "a" = %(0)s, "c" = %(1)s WHERE "a" = %(2)s',
six.text_type(us))
def test_context_id_update(self):
""" tests that the right things happen the the context id """
ss = SelectStatement('table')
ss.add_where_clause(WhereClause('a', EqualsOperator(), 'b'))
self.assertEqual(ss.get_context(), {'0': 'b'})
self.assertEqual(str(ss), 'SELECT * FROM table WHERE "a" = %(0)s')
ss.update_context_id(5)
self.assertEqual(ss.get_context(), {'5': 'b'})
self.assertEqual(str(ss), 'SELECT * FROM table WHERE "a" = %(5)s')
def test_context_update(self):
us = UpdateStatement('table')
us.add_assignment_clause(AssignmentClause('a', 'b'))
us.add_assignment_clause(AssignmentClause('c', 'd'))
us.add_where_clause(WhereClause('a', EqualsOperator(), 'x'))
us.update_context_id(3)
self.assertEqual(
six.text_type(us),
'UPDATE table SET "a" = %(4)s, "c" = %(5)s WHERE "a" = %(3)s')
self.assertEqual(us.get_context(), {'4': 'b', '5': 'd', '3': 'x'})
def test_mintimeuuid_function(self):
"""
Tests that queries with helper functions are generated properly
"""
now = datetime.now()
where = WhereClause('time', EqualsOperator(), functions.MinTimeUUID(now))
where.set_context_id(5)
self.assertEqual(str(where), '"time" = MinTimeUUID(%(5)s)')
ctx = {}
where.update_context(ctx)
self.assertEqual(ctx, {'5': DateTime().to_database(now)})
def delete(self):
""" Deletes one instance """
if self.instance is None:
raise CQLEngineException("DML Query instance attribute is None")
ds = DeleteStatement(self.column_family_name,
timestamp=self._timestamp)
for name, col in self.model._primary_keys.items():
ds.add_where_clause(
WhereClause(col.db_field_name, EqualsOperator(),
col.to_database(getattr(self.instance, name))))
self._execute(ds)
def _delete_null_columns(self):
"""
executes a delete query to remove columns that have changed to null
"""
ds = DeleteStatement(self.column_family_name)
deleted_fields = False
for _, v in self.instance._values.items():
col = v.column
if v.deleted:
ds.add_field(col.db_field_name)
deleted_fields = True
elif isinstance(col, Map):
uc = MapDeleteClause(col.db_field_name, v.value,
v.previous_value)
if uc.get_context_size() > 0:
ds.add_field(uc)
deleted_fields = True
if deleted_fields:
for name, col in self.model._primary_keys.items():
ds.add_where_clause(
WhereClause(col.db_field_name, EqualsOperator(),
col.to_database(getattr(self.instance, name))))
self._execute(ds)
def __eq__(self, other):
return WhereClause(six.text_type(self), EqualsOperator(), self._to_database(other))
def test_additional_rendering(self):
us = UpdateStatement('table', ttl=60)
us.add_assignment_clause(AssignmentClause('a', 'b'))
us.add_where_clause(WhereClause('a', EqualsOperator(), 'x'))
self.assertIn('USING TTL 60', six.text_type(us))
def test_context(self):
ds = DeleteStatement('table', None)
ds.add_where_clause(WhereClause('a', EqualsOperator(), 'b'))
self.assertEqual(ds.get_context(), {'0': 'b'})
def test_equality_method(self):
""" tests that 2 identical where clauses evaluate as == """
wc1 = WhereClause('a', EqualsOperator(), 'c')
wc2 = WhereClause('a', EqualsOperator(), 'c')
assert wc1 == wc2
def __gt__(self, other):
return WhereClause(six.text_type(self), GreaterThanOperator(), self._to_database(other))
def test_context(self):
ss = SelectStatement('table')
ss.add_where_clause(WhereClause('a', EqualsOperator(), 'b'))
self.assertEqual(ss.get_context(), {'0': 'b'})
def test_where_clause_rendering(self):
ss = SelectStatement('table')
ss.add_where_clause(WhereClause('a', EqualsOperator(), 'b'))
self.assertEqual(six.text_type(ss),
'SELECT * FROM table WHERE "a" = %(0)s',
six.text_type(ss))
def __le__(self, other):
return WhereClause(six.text_type(self), LessThanOrEqualOperator(), self._to_database(other))
def test_context(self):
us = UpdateStatement('table')
us.add_assignment_clause(AssignmentClause('a', 'b'))
us.add_assignment_clause(AssignmentClause('c', 'd'))
us.add_where_clause(WhereClause('a', EqualsOperator(), 'x'))
self.assertEqual(us.get_context(), {'0': 'b', '1': 'd', '2': 'x'})
def test_operator_check(self):
""" tests that creating a where statement with a non BaseWhereOperator object fails """
with self.assertRaises(StatementException):
WhereClause('a', 'b', 'c')
def test_where_clause_rendering(self):
ds = DeleteStatement('table', None)
ds.add_where_clause(WhereClause('a', EqualsOperator(), 'b'))
self.assertEqual(six.text_type(ds),
'DELETE FROM table WHERE "a" = %(0)s',
six.text_type(ds))