Class ConditionalRow (0.34.0)

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_row_row_key] :end-before: [END bigtable_row_row_key]

Returns

Type	Description
`bytes`	The key for the current row.

table

Row table.

For example:

.. literalinclude:: snippets_table.py :start-after: [START bigtable_row_table] :end-before: [END bigtable_row_table]

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_row_clear] :end-before: [END bigtable_row_clear]

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_row_commit] :end-before: [END bigtable_row_commit]

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_row_delete] :end-before: [END bigtable_row_delete]

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.

.. literalinclude:: snippets_table.py :start-after: [START bigtable_row_delete_cell] :end-before: [END bigtable_row_delete_cell]

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.

.. literalinclude:: snippets_table.py :start-after: [START bigtable_row_delete_cells] :end-before: [END bigtable_row_delete_cells]

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).

.. literalinclude:: snippets_table.py :start-after: [START bigtable_row_set_cell] :end-before: [END bigtable_row_set_cell]

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`.