def create(self):
"""Create this database within its instance
Inclues any configured schema assigned to :attr:`ddl_statements`.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.DatabaseAdmin.CreateDatabase
"""
api = self._instance._client.database_admin_api
options = _options_with_prefix(self.name)
db_name = self.database_id
if '-' in db_name:
db_name = '`%s`' % (db_name, )
try:
future = api.create_database(
parent=self._instance.name,
create_statement='CREATE DATABASE %s' % (db_name, ),
extra_statements=list(self._ddl_statements),
options=options,
)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.ALREADY_EXISTS:
raise Conflict(self.name)
elif exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound('Instance not found: {name}'.format(
name=self._instance.name, ))
raise
future.caller_metadata = {'request_type': 'CreateDatabase'}
return future
def list_databases(self, page_size=None, page_token=None):
"""List databases for the instance.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.DatabaseAdmin.ListDatabases
:type page_size: int
:param page_size: (Optional) Maximum number of results to return.
:type page_token: str
:param page_token: (Optional) Token for fetching next page of results.
:rtype: :class:`~google.cloud.iterator.Iterator`
:returns:
Iterator of :class:`~google.cloud.spanner.database.Database`
resources within the current instance.
"""
if page_token is None:
page_token = INITIAL_PAGE
options = _options_with_prefix(self.name, page_token=page_token)
page_iter = self._client.database_admin_api.list_databases(
self.name, page_size=page_size, options=options)
iterator = GAXIterator(self._client, page_iter, _item_to_database)
iterator.instance = self
return iterator
def begin(self):
"""Begin a transaction on the database.
:rtype: bytes
:returns: the ID for the newly-begun transaction.
:raises: ValueError if the transaction is already begun, committed,
or rolled back.
"""
if self._id is not None:
raise ValueError("Transaction already begun")
if self.committed is not None:
raise ValueError("Transaction already committed")
if self._rolled_back:
raise ValueError("Transaction is already rolled back")
database = self._session._database
api = database.spanner_api
options = _options_with_prefix(database.name)
txn_options = TransactionOptions(
read_write=TransactionOptions.ReadWrite())
response = api.begin_transaction(self._session.name,
txn_options,
options=options)
self._id = response.id
return self._id
def update_ddl(self, ddl_statements):
"""Update DDL for this database.
Apply any configured schema from :attr:`ddl_statements`.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.DatabaseAdmin.UpdateDatabase
:rtype: :class:`google.cloud.future.operation.Operation`
:returns: an operation instance
:raises NotFound: if the database does not exist
:raises GaxError:
for errors other than ``NOT_FOUND`` returned from the call
"""
client = self._instance._client
api = client.database_admin_api
options = _options_with_prefix(self.name)
try:
future = api.update_database_ddl(
self.name, ddl_statements, '', options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound(self.name)
raise
return future
def list_instance_configs(self, page_size=None, page_token=None):
"""List available instance configurations for the client's project.
See:
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.InstanceAdmin.ListInstanceConfigs
:type page_size: int
:param page_size: (Optional) Maximum number of results to return.
:type page_token: str
:param page_token: (Optional) Token for fetching next page of results.
:rtype: :class:`~google.cloud.iterator.Iterator`
:returns:
Iterator of
:class:`~google.cloud.spanner.instance.InstanceConfig`
resources within the client's project.
"""
if page_token is None:
page_token = INITIAL_PAGE
options = _options_with_prefix(self.project_name,
page_token=page_token)
path = 'projects/%s' % (self.project,)
page_iter = self.instance_admin_api.list_instance_configs(
path, page_size=page_size, options=options)
return GAXIterator(self, page_iter, _item_to_instance_config)
def list_instances(self, filter_='', page_size=None, page_token=None):
"""List instances for the client's project.
See:
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.InstanceAdmin.ListInstances
:type filter_: string
:param filter_: (Optional) Filter to select instances listed. See:
the ``ListInstancesRequest`` docs above for examples.
:type page_size: int
:param page_size: (Optional) Maximum number of results to return.
:type page_token: str
:param page_token: (Optional) Token for fetching next page of results.
:rtype: :class:`~google.cloud.iterator.Iterator`
:returns:
Iterator of :class:`~google.cloud.spanner.instance.Instance`
resources within the client's project.
"""
if page_token is None:
page_token = INITIAL_PAGE
options = _options_with_prefix(self.project_name,
page_token=page_token)
path = 'projects/%s' % (self.project,)
page_iter = self.instance_admin_api.list_instances(
path, filter_=filter_, page_size=page_size, options=options)
return GAXIterator(self, page_iter, _item_to_instance)
def execute_sql(self, sql, params=None, param_types=None, query_mode=None,
resume_token=b''):
"""Perform an ``ExecuteStreamingSql`` API request for rows in a table.
:type sql: str
:param sql: SQL query statement
:type params: dict, {str -> column value}
:param params: values for parameter replacement. Keys must match
the names used in ``sql``.
:type param_types: dict
:param param_types:
(Optional) maps explicit types for one or more param values;
required if parameters are passed.
:type query_mode:
:class:`google.cloud.proto.spanner.v1.ExecuteSqlRequest.QueryMode`
:param query_mode: Mode governing return of results / query plan. See
https://cloud.google.com/spanner/reference/rpc/google.spanner.v1#google.spanner.v1.ExecuteSqlRequest.QueryMode1
:type resume_token: bytes
:param resume_token: token for resuming previously-interrupted query
:rtype: :class:`~google.cloud.spanner.streamed.StreamedResultSet`
:returns: a result set instance which can be used to consume rows.
:raises ValueError:
for reuse of single-use snapshots, or if a transaction ID is
already pending for multiple-use snapshots.
"""
if self._read_request_count > 0:
if not self._multi_use:
raise ValueError("Cannot re-use single-use snapshot.")
if self._transaction_id is None:
raise ValueError("Transaction ID pending.")
if params is not None:
if param_types is None:
raise ValueError(
"Specify 'param_types' when passing 'params'.")
params_pb = Struct(fields={
key: _make_value_pb(value) for key, value in params.items()})
else:
params_pb = None
database = self._session._database
options = _options_with_prefix(database.name)
transaction = self._make_txn_selector()
api = database.spanner_api
iterator = api.execute_streaming_sql(
self._session.name, sql,
transaction=transaction, params=params_pb, param_types=param_types,
query_mode=query_mode, resume_token=resume_token, options=options)
self._read_request_count += 1
if self._multi_use:
return StreamedResultSet(iterator, source=self)
else:
return StreamedResultSet(iterator)
def begin(self):
"""Begin a read-only transaction on the database.
:rtype: bytes
:returns: the ID for the newly-begun transaction.
:raises ValueError:
if the transaction is already begun, committed, or rolled back.
"""
if not self._multi_use:
raise ValueError("Cannot call 'begin' single-use snapshots")
if self._transaction_id is not None:
raise ValueError("Read-only transaction already begun")
if self._read_request_count > 0:
raise ValueError("Read-only transaction already pending")
database = self._session._database
api = database.spanner_api
options = _options_with_prefix(database.name)
txn_selector = self._make_txn_selector()
response = api.begin_transaction(
self._session.name, txn_selector.begin, options=options)
self._transaction_id = response.id
return self._transaction_id
def update_ddl(self, ddl_statements):
"""Update DDL for this database.
Apply any configured schema from :attr:`ddl_statements`.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.DatabaseAdmin.UpdateDatabase
:rtype: :class:`google.cloud.operation.Operation`
:returns: an operation instance
"""
client = self._instance._client
api = client.database_admin_api
options = _options_with_prefix(self.name)
try:
future = api.update_database_ddl(self.name,
ddl_statements,
'',
options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound(self.name)
raise
future.caller_metadata = {'request_type': 'UpdateDatabaseDdl'}
return future
def rollback(self):
"""Roll back a transaction on the database."""
self._check_state()
database = self._session._database
api = database.spanner_api
options = _options_with_prefix(database.name)
api.rollback(self._session.name, self._id, options=options)
self._rolled_back = True
def read(self, table, columns, keyset, index='', limit=0):
"""Perform a ``StreamingRead`` API request for rows in a table.
:type table: str
:param table: name of the table from which to fetch data
:type columns: list of str
:param columns: names of columns to be retrieved
:type keyset: :class:`~google.cloud.spanner.keyset.KeySet`
:param keyset: keys / ranges identifying rows to be retrieved
:type index: str
:param index: (Optional) name of index to use, rather than the
table's primary key
:type limit: int
:param limit: (Optional) maxiumn number of rows to return
:rtype: :class:`~google.cloud.spanner.streamed.StreamedResultSet`
:returns: a result set instance which can be used to consume rows.
:raises ValueError:
for reuse of single-use snapshots, or if a transaction ID is
already pending for multiple-use snapshots.
"""
if self._read_request_count > 0:
if not self._multi_use:
raise ValueError("Cannot re-use single-use snapshot.")
if self._transaction_id is None:
raise ValueError("Transaction ID pending.")
database = self._session._database
api = database.spanner_api
options = _options_with_prefix(database.name)
transaction = self._make_txn_selector()
restart = functools.partial(api.streaming_read,
self._session.name,
table,
columns,
keyset.to_pb(),
transaction=transaction,
index=index,
limit=limit,
options=options)
iterator = _restart_on_unavailable(restart)
self._read_request_count += 1
if self._multi_use:
return StreamedResultSet(iterator, source=self)
else:
return StreamedResultSet(iterator)
def create(self):
"""Create this session, bound to its database.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.v1#google.spanner.v1.Spanner.CreateSession
:raises: :exc:`ValueError` if :attr:`session_id` is already set.
"""
if self._session_id is not None:
raise ValueError('Session ID already set by back-end')
api = self._database.spanner_api
options = _options_with_prefix(self._database.name)
session_pb = api.create_session(self._database.name, options=options)
self._session_id = session_pb.name.split('/')[-1]
def drop(self):
"""Drop this database.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.DatabaseAdmin.DropDatabase
"""
api = self._instance._client.database_admin_api
options = _options_with_prefix(self.name)
try:
api.drop_database(self.name, options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound(self.name)
raise
def exists(self):
"""Test whether this database exists.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.DatabaseAdmin.GetDatabaseDDL
"""
api = self._instance._client.database_admin_api
options = _options_with_prefix(self.name)
try:
api.get_database_ddl(self.name, options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
return False
raise
return True
def create(self):
"""Create this instance.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.instance.v1#google.spanner.admin.instance.v1.InstanceAdmin.CreateInstance
.. note::
Uses the ``project`` and ``instance_id`` on the current
:class:`Instance` in addition to the ``display_name``.
To change them before creating, reset the values via
.. code:: python
instance.display_name = 'New display name'
instance.instance_id = 'i-changed-my-mind'
before calling :meth:`create`.
:rtype: :class:`google.api.core.operation.Operation`
:returns: an operation instance
:raises Conflict: if the instance already exists
:raises GaxError:
for errors other than ``ALREADY_EXISTS`` returned from the call
"""
api = self._client.instance_admin_api
instance_pb = admin_v1_pb2.Instance(
name=self.name,
config=self.configuration_name,
display_name=self.display_name,
node_count=self.node_count,
)
options = _options_with_prefix(self.name)
try:
future = api.create_instance(
parent=self._client.project_name,
instance_id=self.instance_id,
instance=instance_pb,
options=options,
)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.ALREADY_EXISTS:
raise Conflict(self.name)
raise
return future
def read(self,
table,
columns,
keyset,
index='',
limit=0,
resume_token=b''):
"""Perform a ``StreamingRead`` API request for rows in a table.
:type table: str
:param table: name of the table from which to fetch data
:type columns: list of str
:param columns: names of columns to be retrieved
:type keyset: :class:`~google.cloud.spanner.keyset.KeySet`
:param keyset: keys / ranges identifying rows to be retrieved
:type index: str
:param index: (Optional) name of index to use, rather than the
table's primary key
:type limit: int
:param limit: (Optional) maxiumn number of rows to return
:type resume_token: bytes
:param resume_token: token for resuming previously-interrupted read
:rtype: :class:`~google.cloud.spanner.streamed.StreamedResultSet`
:returns: a result set instance which can be used to consume rows.
"""
database = self._session._database
api = database.spanner_api
options = _options_with_prefix(database.name)
transaction = self._make_txn_selector()
iterator = api.streaming_read(self._session.name,
table,
columns,
keyset.to_pb(),
transaction=transaction,
index=index,
limit=limit,
resume_token=resume_token,
options=options)
return StreamedResultSet(iterator)
def reload(self):
"""Reload the metadata for this instance.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.instance.v1#google.spanner.admin.instance.v1.InstanceAdmin.GetInstanceConfig
"""
api = self._client.instance_admin_api
options = _options_with_prefix(self.name)
try:
instance_pb = api.get_instance(self.name, options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound(self.name)
raise
self._update_from_pb(instance_pb)
def update(self):
"""Update this instance.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.instance.v1#google.spanner.admin.instance.v1.InstanceAdmin.UpdateInstance
.. note::
Updates the ``display_name`` and ``node_count``. To change those
values before updating, set them via
.. code:: python
instance.display_name = 'New display name'
instance.node_count = 5
before calling :meth:`update`.
:rtype: :class:`google.api.core.operation.Operation`
:returns: an operation instance
:raises NotFound: if the instance does not exist
:raises GaxError: for other errors returned from the call
"""
api = self._client.instance_admin_api
instance_pb = admin_v1_pb2.Instance(
name=self.name,
config=self.configuration_name,
display_name=self.display_name,
node_count=self.node_count,
)
field_mask = FieldMask(paths=['config', 'display_name', 'node_count'])
options = _options_with_prefix(self.name)
try:
future = api.update_instance(
instance=instance_pb,
field_mask=field_mask,
options=options,
)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound(self.name)
raise
return future
def delete(self):
"""Delete this session.
See:
https://cloud.google.com/spanner/reference/rpc/google.spanner.v1#google.spanner.v1.Spanner.GetSession
:raises: :exc:`ValueError` if :attr:`session_id` is not already set.
"""
if self._session_id is None:
raise ValueError('Session ID not set by back-end')
api = self._database.spanner_api
options = _options_with_prefix(self._database.name)
try:
api.delete_session(self.name, options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound(self.name)
raise
def reload(self):
"""Reload this database.
Refresh any configured schema into :attr:`ddl_statements`.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.DatabaseAdmin.GetDatabaseDDL
"""
api = self._instance._client.database_admin_api
options = _options_with_prefix(self.name)
try:
response = api.get_database_ddl(self.name, options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound(self.name)
raise
self._ddl_statements = tuple(response.statements)
def commit(self):
"""Commit mutations to the database.
:rtype: datetime
:returns: timestamp of the committed changes.
"""
self._check_state()
database = self._session._database
api = database.spanner_api
options = _options_with_prefix(database.name)
txn_options = TransactionOptions(
read_write=TransactionOptions.ReadWrite())
response = api.commit(self._session.name,
self._mutations,
single_use_transaction=txn_options,
options=options)
self.committed = _pb_timestamp_to_datetime(response.commit_timestamp)
return self.committed
def exists(self):
"""Test for the existence of this session.
See:
https://cloud.google.com/spanner/reference/rpc/google.spanner.v1#google.spanner.v1.Spanner.GetSession
:rtype: bool
:returns: True if the session exists on the back-end, else False.
"""
if self._session_id is None:
return False
api = self._database.spanner_api
options = _options_with_prefix(self._database.name)
try:
api.get_session(self.name, options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
return False
raise
else:
return True
def delete(self):
"""Delete this session.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.v1#google.spanner.v1.Spanner.GetSession
:raises ValueError: if :attr:`session_id` is not already set.
:raises NotFound: if the session does not exist
:raises GaxError:
for errors other than ``NOT_FOUND`` returned from the call
"""
if self._session_id is None:
raise ValueError('Session ID not set by back-end')
api = self._database.spanner_api
options = _options_with_prefix(self._database.name)
try:
api.delete_session(self.name, options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound(self.name)
raise
def commit(self):
"""Commit mutations to the database.
:rtype: datetime
:returns: timestamp of the committed changes.
:raises: :exc:`ValueError` if there are no mutations to commit.
"""
self._check_state()
if len(self._mutations) == 0:
raise ValueError("No mutations to commit")
database = self._session._database
api = database.spanner_api
options = _options_with_prefix(database.name)
response = api.commit(self._session.name,
self._mutations,
transaction_id=self._id,
options=options)
self.committed = _pb_timestamp_to_datetime(response.commit_timestamp)
return self.committed
def exists(self):
"""Test whether this database exists.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.DatabaseAdmin.GetDatabaseDDL
:rtype: bool
:returns: True if the database exists, else false.
:raises GaxError:
for errors other than ``NOT_FOUND`` returned from the call
"""
api = self._instance._client.database_admin_api
options = _options_with_prefix(self.name)
try:
api.get_database_ddl(self.name, options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
return False
raise
return True
def create(self):
"""Create this database within its instance
Inclues any configured schema assigned to :attr:`ddl_statements`.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.DatabaseAdmin.CreateDatabase
:rtype: :class:`~google.cloud.future.operation.Operation`
:returns: a future used to poll the status of the create request
:raises Conflict: if the database already exists
:raises NotFound: if the instance owning the database does not exist
:raises GaxError:
for errors other than ``ALREADY_EXISTS`` returned from the call
"""
api = self._instance._client.database_admin_api
options = _options_with_prefix(self.name)
db_name = self.database_id
if '-' in db_name:
db_name = '`%s`' % (db_name,)
try:
future = api.create_database(
parent=self._instance.name,
create_statement='CREATE DATABASE %s' % (db_name,),
extra_statements=list(self._ddl_statements),
options=options,
)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.ALREADY_EXISTS:
raise Conflict(self.name)
elif exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound('Instance not found: {name}'.format(
name=self._instance.name,
))
raise
return future
def delete(self):
"""Mark an instance and all of its databases for permanent deletion.
See
https://cloud.google.com/spanner/reference/rpc/google.spanner.admin.instance.v1#google.spanner.admin.instance.v1.InstanceAdmin.DeleteInstance
Immediately upon completion of the request:
* Billing will cease for all of the instance's reserved resources.
Soon afterward:
* The instance and all databases within the instance will be deleteed.
All data in the databases will be permanently deleted.
"""
api = self._client.instance_admin_api
options = _options_with_prefix(self.name)
try:
api.delete_instance(self.name, options=options)
except GaxError as exc:
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
raise NotFound(self.name)
raise
def _call_fut(self, *args, **kw):
from google.cloud.spanner._helpers import _options_with_prefix
return _options_with_prefix(*args, **kw)
