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Snapshot(
session,
read_timestamp=None,
min_read_timestamp=None,
max_staleness=None,
exact_staleness=None,
multi_use=False,
transaction_id=None,
)
Allow a set of reads / SQL statements with shared staleness.
If no options are passed, reads will use the strong
model, reading
at a timestamp where all previously committed transactions are visible.
Parameters |
|
---|---|
Name | Description |
session |
Session
The session used to perform the commit. |
read_timestamp |
Execute all reads at the given timestamp. |
min_read_timestamp |
Execute all reads at a timestamp >= |
max_staleness |
Read data at a timestamp >= NOW - |
exact_staleness |
Execute all reads at a timestamp that is |
multi_use |
If true, multiple |
Methods
begin
begin()
Begin a read-only transaction on the database.
Exceptions | |
---|---|
Type | Description |
ValueError |
if the transaction is already begun, committed, or rolled back. |
Returns | |
---|---|
Type | Description |
bytes |
the ID for the newly-begun transaction. |
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,
timeout=_MethodDefault._DEFAULT_VALUE,
data_boost_enabled=False,
directed_read_options=None,
)
Perform an ExecuteStreamingSql
API request.
Parameters | |
---|---|
Name | Description |
sql |
str
SQL query statement |
params |
dict, {str -> column value}
values for parameter replacement. Keys must match the names used in |
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: |
query_options |
QueryOptions or
(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 |
retry |
(Optional) The retry settings for this request. |
timeout |
float
(Optional) The timeout for this request. |
directed_read_options |
DirectedReadOptions or
(Optional) Request level option used to set the directed_read_options for all ReadRequests and ExecuteSqlRequests that indicates which replicas or regions should be used for non-transactional reads or queries. |
Exceptions | |
---|---|
Type | Description |
ValueError |
for reuse of single-use snapshots, or if a transaction ID is already pending for multiple-use snapshots. |
Returns | |
---|---|
Type | Description |
StreamedResultSet |
a result set instance which can be used to consume rows. |
partition_query
partition_query(
sql,
params=None,
param_types=None,
partition_size_bytes=None,
max_partitions=None,
*,
retry=_MethodDefault._DEFAULT_VALUE,
timeout=_MethodDefault._DEFAULT_VALUE
)
Perform a PartitionQuery
API request.
Parameters | |
---|---|
Name | Description |
sql |
str
SQL query statement |
params |
dict, {str -> column value}
values for parameter replacement. Keys must match the names used in |
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 |
(Optional) The retry settings for this request. |
timeout |
float
(Optional) The timeout for this request. |
Exceptions | |
---|---|
Type | Description |
ValueError |
for single-use snapshots, or if a transaction ID is already associated with the snapshot. |
Returns | |
---|---|
Type | Description |
iterable of bytes |
a sequence of partition tokens |
partition_read
partition_read(
table,
columns,
keyset,
index="",
partition_size_bytes=None,
max_partitions=None,
*,
retry=_MethodDefault._DEFAULT_VALUE,
timeout=_MethodDefault._DEFAULT_VALUE
)
Perform a PartitionRead
API request for rows in a table.
Parameters | |
---|---|
Name | Description |
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 |
(Optional) The retry settings for this request. |
timeout |
float
(Optional) The timeout for this request. |
Exceptions | |
---|---|
Type | Description |
ValueError |
for single-use snapshots, or if a transaction ID is already associated with the snapshot. |
Returns | |
---|---|
Type | Description |
iterable of bytes |
a sequence of partition tokens |
read
read(
table,
columns,
keyset,
index="",
limit=0,
partition=None,
request_options=None,
data_boost_enabled=False,
directed_read_options=None,
*,
retry=_MethodDefault._DEFAULT_VALUE,
timeout=_MethodDefault._DEFAULT_VALUE
)
Perform a StreamingRead
API request for rows in a table.
Parameters | |
---|---|
Name | Description |
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 |
bytes
(Optional) one of the partition tokens returned from |
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 |
retry |
(Optional) The retry settings for this request. |
timeout |
float
(Optional) The timeout for this request. |
directed_read_options |
DirectedReadOptions or
(Optional) Request level option used to set the directed_read_options for all ReadRequests and ExecuteSqlRequests that indicates which replicas or regions should be used for non-transactional reads or queries. |
Exceptions | |
---|---|
Type | Description |
ValueError |
for reuse of single-use snapshots, or if a transaction ID is already pending for multiple-use snapshots. |
Returns | |
---|---|
Type | Description |
StreamedResultSet |
a result set instance which can be used to consume rows. |