Class ConditionalRow (2.21.0)

Version 2.21.0

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ConditionalRow(row_key, table, filter_)

Google Cloud Bigtable Row for sending mutations conditionally.

Each mutation has an associated state: :data:True or :data:False. When commit-ed, the mutations for the :data:True state will be applied if the filter matches any cells in the row, otherwise the :data:False state will be applied.

A ConditionalRow accumulates mutations in the same way a DirectRow does:

• set_cell
• delete
• delete_cell
• delete_cells

with the only change the extra state parameter::

row_cond = table.row(b'row-key2', filter_=row_filter) row_cond.set_cell(u'fam', b'col', b'cell-val', state=True) row_cond.delete_cell(u'fam', b'col', state=False)

Note: As with DirectRow, to actually send these mutations to the Google Cloud Bigtable API, you must call commit.

Parameters
Name	Description
row_key	bytes The key for the current row.
table	Table The table that owns the row.
filter_	.RowFilter Filter to be used for conditional mutations.

Properties

row_key

Row key.

For example:

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_row_row_key] :end-before: [END bigtable_api_row_row_key] :dedent: 4

Returns
Type	Description
bytes	The key for the current row.

table

Row table.

For example:

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_row_table] :end-before: [END bigtable_api_row_table] :dedent: 4

Returns
Type	Description
table: Table	table: The table that owns the row.

Methods

clear

clear()

Removes all currently accumulated mutations on the current row.

For example:

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_row_clear] :end-before: [END bigtable_api_row_clear] :dedent: 4

commit

commit()

Makes a CheckAndMutateRow API request.

If no mutations have been created in the row, no request is made.

The mutations will be applied conditionally, based on whether the filter matches any cells in the ConditionalRow or not. (Each method which adds a mutation has a state parameter for this purpose.)

Mutations are applied atomically and in order, meaning that earlier mutations can be masked / negated by later ones. Cells already present in the row are left unchanged unless explicitly changed by a mutation.

After committing the accumulated mutations, resets the local mutations.

For example:

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_row_commit] :end-before: [END bigtable_api_row_commit] :dedent: 4

Exceptions
Type	Description
`ValueErro

Returns
Type	Description
bool	Flag indicating if the filter was matched (which also indicates which set of mutations were applied by the server).

delete

delete(state=True)

Deletes this row from the table.

Note: This method adds a mutation to the accumulated mutations on this row, but does not make an API request. To actually send an API request (with the mutations) to the Google Cloud Bigtable API, call commit.

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_row_delete] :end-before: [END bigtable_api_row_delete] :dedent: 4

Parameter
Name	Description
state	bool (Optional) The state that the mutation should be applied in. Defaults to :data:True.

delete_cell

delete_cell(column_family_id, column, time_range=None, state=True)

Deletes cell in this row.

Note: This method adds a mutation to the accumulated mutations on this row, but does not make an API request. To actually send an API request (with the mutations) to the Google Cloud Bigtable API, call commit.

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_row_delete_cell] :end-before: [END bigtable_api_row_delete_cell] :dedent: 4

Parameters
Name	Description
column_family_id	str The column family that contains the column or columns with cells being deleted. Must be of the form <code>_a-zA-Z0-9][-_.a-zA-Z0-9]</code>*.
column	bytes The column within the column family that will have a cell deleted.
time_range	TimestampRange (Optional) The range of time within which cells should be deleted.
state	bool (Optional) The state that the mutation should be applied in. Defaults to :data:True.

delete_cells

delete_cells(column_family_id, columns, time_range=None, state=True)

Deletes cells in this row.

Note: This method adds a mutation to the accumulated mutations on this row, but does not make an API request. To actually send an API request (with the mutations) to the Google Cloud Bigtable API, call commit.

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_row_delete_cells] :end-before: [END bigtable_api_row_delete_cells] :dedent: 4

Parameters
Name	Description
column_family_id	str The column family that contains the column or columns with cells being deleted. Must be of the form <code>_a-zA-Z0-9][-_.a-zA-Z0-9]</code>*.
columns	list of str / unicode , or object The columns within the column family that will have cells deleted. If ALL_COLUMNS is used then the entire column family will be deleted from the row.
time_range	TimestampRange (Optional) The range of time within which cells should be deleted.
state	bool (Optional) The state that the mutation should be applied in. Defaults to :data:True.

set_cell

set_cell(column_family_id, column, value, timestamp=None, state=True)

Sets a value in this row.

The cell is determined by the row_key of this ConditionalRow and the column. The column must be in an existing .ColumnFamily (as determined by column_family_id).

Note: This method adds a mutation to the accumulated mutations on this row, but does not make an API request. To actually send an API request (with the mutations) to the Google Cloud Bigtable API, call commit.

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_row_set_cell] :end-before: [END bigtable_api_row_set_cell] :dedent: 4

Parameters
Name	Description
column_family_id	str The column family that contains the column. Must be of the form <code>_a-zA-Z0-9][-_.a-zA-Z0-9]</code>*.
column	bytes The column within the column family where the cell is located.
value	bytes or int The value to set in the cell. If an integer is used, will be interpreted as a 64-bit big-endian signed integer (8 bytes).
timestamp	datetime.datetime (Optional) The timestamp of the operation.
state	bool (Optional) The state that the mutation should be applied in. Defaults to :data:True.