Class Transaction

Implement read-write transaction semantics for a session.

Inheritance

builtins.object > google.cloud.spanner_v1._helpers._SessionWrapper > google.cloud.spanner_v1.snapshot._SnapshotBase > builtins.object > google.cloud.spanner_v1._helpers._SessionWrapper > google.cloud.spanner_v1.batch._BatchBase > Transaction

Methods

__enter__

__enter__()

Begin with block.

__exit__

__exit__(exc_type, exc_val, exc_tb)

End with block.

batch_update

batch_update(statements, request_options=None)

Perform a batch of DML statements via an ExecuteBatchDml request.

Parameters
NameDescription
statements Sequence[Union[ str, Tuple[str, Dict[str, Any], Dict[str, Union[dict, .types.Type]]]]]

List of DML statements, with optional params / param types. If passed, 'params' is a dict mapping names to the values for parameter replacement. Keys must match the names used in the corresponding DML statement. If 'params' is passed, 'param_types' must also be passed, as a dict mapping names to the type of value passed in 'params'.

request_options RequestOptions

(Optional) Common options for this request. If a dict is provided, it must be of the same form as the protobuf message RequestOptions.

Returns
TypeDescription
Tuple(status, Sequence[int])Status code, plus counts of rows affected by each completed DML statement. Note that if the status code is not ``OK``, the statement triggering the error will not have an entry in the list, nor will any statements following that one.

begin

begin()

Begin a transaction on the database.

Exceptions
TypeDescription
ValueErrorif the transaction is already begun, committed, or rolled back.
Returns
TypeDescription
bytesthe ID for the newly-begun transaction.

commit

commit(return_commit_stats=False, request_options=None)

Commit mutations to the database.

Parameters
NameDescription
return_commit_stats bool

If true, the response will return commit stats which can be accessed though commit_stats.

request_options RequestOptions

(Optional) Common options for this request. If a dict is provided, it must be of the same form as the protobuf message RequestOptions.

Exceptions
TypeDescription
ValueErrorif there are no mutations to commit.
Returns
TypeDescription
datetimetimestamp of the committed changes.

delete

delete(table, keyset)

Delete one or more table rows.

Parameters
NameDescription
table str

Name of the table to be modified.

keyset Keyset

Keys/ranges identifying rows to delete.

execute_sql

execute_sql(sql, params=None, param_types=None, query_mode=None, query_options=None, request_options=None, partition=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>)

Perform an ExecuteStreamingSql API request.

Parameters
NameDescription
sql str

SQL query statement

params dict, {str -> column value}

values for parameter replacement. Keys must match the names used in sql.

param_types dict[str -> Union[dict, .types.Type]]

(Optional) maps explicit types for one or more param values; required if parameters are passed.

query_mode QueryMode

Mode governing return of results / query plan. See: QueryMode <https://cloud.google.com/spanner/reference/rpc/google.spanner.v1#google.spanner.v1.ExecuteSqlRequest.QueryMode>_.

query_options QueryOptions or `dict`

(Optional) Query optimizer configuration to use for the given query. If a dict is provided, it must be of the same form as the protobuf message QueryOptions

request_options RequestOptions

(Optional) Common options for this request. If a dict is provided, it must be of the same form as the protobuf message RequestOptions.

partition bytes

(Optional) one of the partition tokens returned from partition_query.

retry `google.api_core.retry.Retry`

(Optional) The retry settings for this request.

timeout float

(Optional) The timeout for this request.

Exceptions
TypeDescription
ValueErrorfor reuse of single-use snapshots, or if a transaction ID is already pending for multiple-use snapshots.
Returns
TypeDescription
StreamedResultSeta result set instance which can be used to consume rows.

execute_update

execute_update(dml, params=None, param_types=None, query_mode=None, query_options=None, request_options=None, *, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>)

Perform an ExecuteSql API request with DML.

Parameters
NameDescription
dml str

SQL DML statement

params dict, {str -> column value}

values for parameter replacement. Keys must match the names used in dml.

param_types dict[str -> Union[dict, .types.Type]]

(Optional) maps explicit types for one or more param values; required if parameters are passed.

query_mode QueryMode

Mode governing return of results / query plan. See: QueryMode <https://cloud.google.com/spanner/reference/rpc/google.spanner.v1#google.spanner.v1.ExecuteSqlRequest.QueryMode>_.

query_options QueryOptions or `dict`

(Optional) Options that are provided for query plan stability.

request_options RequestOptions

(Optional) Common options for this request. If a dict is provided, it must be of the same form as the protobuf message RequestOptions.

retry `google.api_core.retry.Retry`

(Optional) The retry settings for this request.

timeout float

(Optional) The timeout for this request.

Returns
TypeDescription
intCount of rows affected by the DML statement.

insert

insert(table, columns, values)

Insert one or more new table rows.

Parameters
NameDescription
table str

Name of the table to be modified.

columns list of str

Name of the table columns to be modified.

values list of lists

Values to be modified.

insert_or_update

insert_or_update(table, columns, values)

Insert/update one or more table rows.

Parameters
NameDescription
table str

Name of the table to be modified.

columns list of str

Name of the table columns to be modified.

values list of lists

Values to be modified.

partition_query

partition_query(sql, params=None, param_types=None, partition_size_bytes=None, max_partitions=None, *, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>)

Perform a PartitionQuery API request.

Parameters
NameDescription
sql str

SQL query statement

params dict, {str -> column value}

values for parameter replacement. Keys must match the names used in sql.

param_types dict[str -> Union[dict, .types.Type]]

(Optional) maps explicit types for one or more param values; required if parameters are passed.

partition_size_bytes int

(Optional) desired size for each partition generated. The service uses this as a hint, the actual partition size may differ.

max_partitions int

(Optional) desired maximum number of partitions generated. The service uses this as a hint, the actual number of partitions may differ.

retry `google.api_core.retry.Retry`

(Optional) The retry settings for this request.

timeout float

(Optional) The timeout for this request.

Exceptions
TypeDescription
ValueErrorfor single-use snapshots, or if a transaction ID is already associated with the snapshot.
Returns
TypeDescription
iterable of bytesa sequence of partition tokens

partition_read

partition_read(table, columns, keyset, index='', partition_size_bytes=None, max_partitions=None, *, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>)

Perform a PartitionRead API request for rows in a table.

Parameters
NameDescription
table str

name of the table from which to fetch data

columns list of str

names of columns to be retrieved

keyset KeySet

keys / ranges identifying rows to be retrieved

index str

(Optional) name of index to use, rather than the table's primary key

partition_size_bytes int

(Optional) desired size for each partition generated. The service uses this as a hint, the actual partition size may differ.

max_partitions int

(Optional) desired maximum number of partitions generated. The service uses this as a hint, the actual number of partitions may differ.

retry `google.api_core.retry.Retry`

(Optional) The retry settings for this request.

timeout float

(Optional) The timeout for this request.

Exceptions
TypeDescription
ValueErrorfor single-use snapshots, or if a transaction ID is already associated with the snapshot.
Returns
TypeDescription
iterable of bytesa sequence of partition tokens

read

read(table, columns, keyset, index='', limit=0, partition=None, request_options=None, *, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>)

Perform a StreamingRead API request for rows in a table.

Parameters
NameDescription
table str

name of the table from which to fetch data

columns list of str

names of columns to be retrieved

keyset KeySet

keys / ranges identifying rows to be retrieved

index str

(Optional) name of index to use, rather than the table's primary key

limit int

(Optional) maximum number of rows to return. Incompatible with partition.

partition bytes

(Optional) one of the partition tokens returned from partition_read. Incompatible with limit.

request_options RequestOptions

(Optional) Common options for this request. If a dict is provided, it must be of the same form as the protobuf message RequestOptions. Please note, the transactionTag setting will be ignored for snapshot as it's not supported for read-only transactions.

retry `google.api_core.retry.Retry`

(Optional) The retry settings for this request.

timeout float

(Optional) The timeout for this request.

Exceptions
TypeDescription
ValueErrorfor reuse of single-use snapshots, or if a transaction ID is already pending for multiple-use snapshots.
Returns
TypeDescription
StreamedResultSeta result set instance which can be used to consume rows.

replace

replace(table, columns, values)

Replace one or more table rows.

Parameters
NameDescription
table str

Name of the table to be modified.

columns list of str

Name of the table columns to be modified.

values list of lists

Values to be modified.

rollback

rollback()

Roll back a transaction on the database.

update

update(table, columns, values)

Update one or more existing table rows.

Parameters
NameDescription
table str

Name of the table to be modified.

columns list of str

Name of the table columns to be modified.

values list of lists

Values to be modified.