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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.
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 .
|
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 .
|
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.
|
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.
|
delete |
google.cloud.spanner_v1.types.Mutation.Delete
Delete rows from a table. Succeeds whether or not the named rows were present. |
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.