Class Mutation (3.22.0) 

Mutation(mapping=None, *, ignore_unknown_fields=False, **kwargs)

A modification to one or more Cloud Spanner rows. Mutations can be applied to a Cloud Spanner database by sending them in a Commit][google.spanner.v1.Spanner.Commit] call.

This message has oneof_ fields (mutually exclusive fields). For each oneof, at most one member field can be set at the same time. Setting any member of the oneof automatically clears all other members.

.. _oneof: https://proto-plus-python.readthedocs.io/en/stable/fields.html#oneofs-mutually-exclusive-fields

Attributes

NameDescription
insert google.cloud.spanner_v1.types.Mutation.Write
Insert new rows in a table. If any of the rows already exist, the write or transaction fails with error ``ALREADY_EXISTS``. This field is a member of `oneof`_ ``operation``.
update google.cloud.spanner_v1.types.Mutation.Write
Update existing rows in a table. If any of the rows does not already exist, the transaction fails with error ``NOT_FOUND``. This field is a member of `oneof`_ ``operation``.
insert_or_update google.cloud.spanner_v1.types.Mutation.Write
Like `insert][google.spanner.v1.Mutation.insert]`, except that if the row already exists, then its column values are overwritten with the ones provided. Any column values not explicitly written are preserved. When using `insert_or_update][google.spanner.v1.Mutation.insert_or_update]`, just as when using `insert][google.spanner.v1.Mutation.insert]`, all ``NOT NULL`` columns in the table must be given a value. This holds true even when the row already exists and will therefore actually be updated. This field is a member of `oneof`_ ``operation``.
replace google.cloud.spanner_v1.types.Mutation.Write
Like `insert][google.spanner.v1.Mutation.insert]`, except that if the row already exists, it is deleted, and the column values provided are inserted instead. Unlike `insert_or_update][google.spanner.v1.Mutation.insert_or_update]`, this means any values not explicitly written become ``NULL``. In an interleaved table, if you create the child table with the ``ON DELETE CASCADE`` annotation, then replacing a parent row also deletes the child rows. Otherwise, you must delete the child rows before you replace the parent row. This field is a member of `oneof`_ ``operation``.
delete google.cloud.spanner_v1.types.Mutation.Delete
Delete rows from a table. Succeeds whether or not the named rows were present. This field is a member of `oneof`_ ``operation``.

Inheritance

builtins.object > proto.message.Message > Mutation

Classes

Delete

Delete(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Arguments to delete][google.spanner.v1.Mutation.delete] operations.

Write

Write(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Arguments to insert][google.spanner.v1.Mutation.insert], update][google.spanner.v1.Mutation.update], insert_or_update][google.spanner.v1.Mutation.insert_or_update], and replace][google.spanner.v1.Mutation.replace] operations.