def append_cell_value(self, column_family_id, column, value):
"""Appends a value to an existing cell.
.. note::
This method adds a read-modify rule protobuf to the accumulated
read-modify rules on this row, but does not make an API
request. To actually send an API request (with the rules) to the
Google Cloud Bigtable API, call :meth:`commit`.
:type column_family_id: str
:param column_family_id: The column family that contains the column.
Must be of the form
``[_a-zA-Z0-9][-_.a-zA-Z0-9]*``.
:type column: bytes
:param column: The column within the column family where the cell
is located.
:type value: bytes
:param value: The value to append to the existing value in the cell. If
the targeted cell is unset, it will be treated as
containing the empty string.
"""
column = _to_bytes(column)
value = _to_bytes(value)
rule_pb = data_v2_pb2.ReadModifyWriteRule(
family_name=column_family_id,
column_qualifier=column,
append_value=value)
self._rule_pb_list.append(rule_pb)
def increment_cell_value(self, column_family_id, column, int_value):
"""Increments a value in an existing cell.
Assumes the value in the cell is stored as a 64 bit integer
serialized to bytes.
.. note::
This method adds a read-modify rule protobuf to the accumulated
read-modify rules on this row, but does not make an API
request. To actually send an API request (with the rules) to the
Google Cloud Bigtable API, call :meth:`commit`.
:type column_family_id: str
:param column_family_id: The column family that contains the column.
Must be of the form
``[_a-zA-Z0-9][-_.a-zA-Z0-9]*``.
:type column: bytes
:param column: The column within the column family where the cell
is located.
:type int_value: int
:param int_value: The value to increment the existing value in the cell
by. If the targeted cell is unset, it will be treated
as containing a zero. Otherwise, the targeted cell
must contain an 8-byte value (interpreted as a 64-bit
big-endian signed integer), or the entire request
will fail.
"""
column = _to_bytes(column)
rule_pb = data_v2_pb2.ReadModifyWriteRule(family_name=column_family_id,
column_qualifier=column,
increment_amount=int_value)
self._rule_pb_list.append(rule_pb)
def _ReadModifyWriteRulePB(*args, **kw):
from google.cloud.bigtable_v2.proto import (data_pb2 as data_v2_pb2)
return data_v2_pb2.ReadModifyWriteRule(*args, **kw)
