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# Copyright DataStax, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import unittest
from cassandra.cqlengine.columns import Column, Set, List, Text
from cassandra.cqlengine.operators import *
from cassandra.cqlengine.statements import (UpdateStatement, WhereClause,
AssignmentClause, SetUpdateClause,
ListUpdateClause)
class UpdateStatementTests(unittest.TestCase):
def test_table_rendering(self):
""" tests that fields are properly added to the select statement """
us = UpdateStatement('table')
self.assertTrue(str(us).startswith('UPDATE table SET'), str(us))
self.assertTrue(str(us).startswith('UPDATE table SET'), str(us))
def test_rendering(self):
us = UpdateStatement('table')
us.add_assignment(Column(db_field='a'), 'b')
us.add_assignment(Column(db_field='c'), 'd')
us.add_where(Column(db_field='a'), EqualsOperator(), 'x')
self.assertEqual(str(us), 'UPDATE table SET "a" = %(0)s, "c" = %(1)s WHERE "a" = %(2)s', str(us))
us.add_where(Column(db_field='a'), NotEqualsOperator(), 'y')
self.assertEqual(str(us), 'UPDATE table SET "a" = %(0)s, "c" = %(1)s WHERE "a" = %(2)s AND "a" != %(3)s', str(us))
def test_context(self):
us = UpdateStatement('table')
us.add_assignment(Column(db_field='a'), 'b')
us.add_assignment(Column(db_field='c'), 'd')
us.add_where(Column(db_field='a'), EqualsOperator(), 'x')
self.assertEqual(us.get_context(), {'0': 'b', '1': 'd', '2': 'x'})
def test_context_update(self):
us = UpdateStatement('table')
us.add_assignment(Column(db_field='a'), 'b')
us.add_assignment(Column(db_field='c'), 'd')
us.add_where(Column(db_field='a'), EqualsOperator(), 'x')
us.update_context_id(3)
self.assertEqual(str(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_additional_rendering(self):
us = UpdateStatement('table', ttl=60)
us.add_assignment(Column(db_field='a'), 'b')
us.add_where(Column(db_field='a'), EqualsOperator(), 'x')
self.assertIn('USING TTL 60', str(us))
def test_update_set_add(self):
us = UpdateStatement('table')
us.add_update(Set(Text, db_field='a'), set((1,)), 'add')
self.assertEqual(str(us), 'UPDATE table SET "a" = "a" + %(0)s')
def test_update_empty_set_add_does_not_assign(self):
us = UpdateStatement('table')
us.add_update(Set(Text, db_field='a'), set(), 'add')
self.assertFalse(us.assignments)
def test_update_empty_set_removal_does_not_assign(self):
us = UpdateStatement('table')
us.add_update(Set(Text, db_field='a'), set(), 'remove')
self.assertFalse(us.assignments)
def test_update_list_prepend_with_empty_list(self):
us = UpdateStatement('table')
us.add_update(List(Text, db_field='a'), [], 'prepend')
self.assertFalse(us.assignments)
def test_update_list_append_with_empty_list(self):
us = UpdateStatement('table')
us.add_update(List(Text, db_field='a'), [], 'append')
self.assertFalse(us.assignments)
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