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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 | |
---|---|
Name | Description |
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 .
|
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.