本文整理汇总了Python中cqlengine.statements.UpdateStatement.get_context方法的典型用法代码示例。如果您正苦于以下问题：Python UpdateStatement.get_context方法的具体用法？Python UpdateStatement.get_context怎么用？Python UpdateStatement.get_context使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类cqlengine.statements.UpdateStatement的用法示例。
在下文中一共展示了UpdateStatement.get_context方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: test_context_update
# 需要导入模块: from cqlengine.statements import UpdateStatement [as 别名]
# 或者: from cqlengine.statements.UpdateStatement import get_context [as 别名]
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(unicode(us), 'UPDATE table SET "a" = :4, "c" = :5 WHERE "a" = :3')
self.assertEqual(us.get_context(), {"4": "b", "5": "d", "3": "x"})示例2: test_context_update
# 需要导入模块: from cqlengine.statements import UpdateStatement [as 别名]
# 或者: from cqlengine.statements.UpdateStatement import get_context [as 别名]
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'})示例3: save
# 需要导入模块: from cqlengine.statements import UpdateStatement [as 别名]
# 或者: from cqlengine.statements.UpdateStatement import get_context [as 别名]
def save(self, *objects):
"""Flush all pending changes to Cassandra.
objects -- if not None, only operate on this or these object(s)
"""
updates = set()
counter_updates = set()
creates = set()
counter_creates = set()
for model_class, by_key in self.instances_by_class.iteritems():
for key, instance in by_key.iteritems():
if hasattr(instance, '_created') and instance._created:
if model_class.id_mapped_class._has_counter:
counter_creates.add(instance)
else:
creates.add(instance)
elif hasattr(instance, '_dirties'):
if model_class.id_mapped_class._has_counter:
counter_updates.add(instance)
else:
updates.add(instance)
if objects:
updates = updates and objects
counter_updates = counter_updates and objects
creates = creates and objects
counter_creates = counter_creates and objects
with BatchQuery() as batch:
for create in creates:
# Note we skip a lot of cqlengine code and create the
# insert statement directly.
# (this is the non-optimized code that is replaced below)
#key_names = create.id_mapped_class._columns.keys()
#arg = {name: getattr(create, name) for name in key_names}
#create.id_mapped_class.batch(batch).create(**arg)
# (end non-optimized code)
# (begin optimized)
# note: it might save time to memoize column family name
# note: cqlengine-session doesn't yet support 'ttl'
insert = InsertStatement(create.id_mapped_class.column_family_name())#, ttl=self._ttl)
for name, col in create.id_mapped_class._columns.items():
val = col.validate(getattr(create, name))
if col._val_is_null(val):
continue
insert.add_assignment_clause(AssignmentClause(
col.db_field_name,
col.to_database(val)))
# skip query execution if it's empty
# caused by pointless update queries
if not insert.is_empty:
batch.add_query(insert)
# (end optimized)
del create._created
try:
del create._dirties
except AttributeError:
pass
for update in updates:
key_names = update._primary_keys.keys()
arg = {name: getattr(update, name) for name in key_names}
dirties = update._dirties
update.id_mapped_class.objects(**arg).batch(batch).update(**dirties)
del update._dirties
# It would seem that batch does not work with counter?
#with BatchQuery() as batch:
for create in counter_creates:
primary_key_names = create.id_mapped_class._primary_keys.keys()
arg = {name: getattr(create, name) for name in primary_key_names}
instance = create.id_mapped_class.create(**arg)
for name, col in create.id_mapped_class._columns.items():
if isinstance(col, columns.Counter):
val = getattr(create, name)
setattr(instance, name, val)
del create._created
try:
del create._dirties
except AttributeError:
pass
instance.update()
for update in counter_updates:
statement = UpdateStatement(update.id_mapped_class.column_family_name())#, ttl=self._ttl)
for name, value in update._dirties.items():
col = update.id_mapped_class._columns[name]
clause = CounterUpdateClause(col.db_field_name, value, 0, column=col)
statement.add_assignment_clause(clause)
for name, col in update.id_mapped_class._primary_keys.items():
statement.add_where_clause(WhereClause(
col.db_field_name,
EqualsOperator(),
col.to_database(getattr(update, name))
))
params = statement.get_context()
statement = SimpleStatement(str(statement))
cqlengine.connection.get_session().execute(statement, params)
del update._dirties
# for delete in self.deletes:
# raise NotImplementedError
for callable, args, kwargs in self.call_after_save:
callable(*args, **kwargs)
#.........这里部分代码省略.........
示例4: test_context
# 需要导入模块: from cqlengine.statements import UpdateStatement [as 别名]
# 或者: from cqlengine.statements.UpdateStatement import get_context [as 别名]
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"})