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Database(database_id, instance, ddl_statements=(), pool=None)Representation of a Cloud Spanner Database.
We can use a Database to:
createthe databasereloadthe databaseupdatethe databasedropthe database
Parameters | |
|---|---|
| Name | Description |
database_id |
str
The ID of the database. |
instance |
Instance
The instance that owns the database. |
ddl_statements |
list of string
(Optional) DDL statements, excluding the CREATE DATABASE statement. |
pool |
concrete subclass of AbstractSessionPool.
(Optional) session pool to be used by database. If not passed, the database will construct an instance of BurstyPool. |
Properties
create_time
Create time of this database.
| Returns | |
|---|---|
| Type | Description |
| a datetime object representing the create time of this database |
ddl_statements
DDL Statements used to define database schema.
See cloud.google.com/spanner/docs/data-definition-language
| Returns | |
|---|---|
| Type | Description |
sequence of string | the statements |
name
Database name used in requests.
"projects/../instances/../databases/{database_id}"
| Returns | |
|---|---|
| Type | Description |
str | The database name. |
restore_info
Restore info for this database.
| Returns | |
|---|---|
| Type | Description |
RestoreInfo | an object representing the restore info for this database |
spanner_api
Helper for session-related API calls.
state
State of this database.
| Returns | |
|---|---|
| Type | Description |
State | an enum describing the state of the database |
Methods
batch
batch()Return an object which wraps a batch.
The wrapper must be used as a context manager, with the batch as the value returned by the wrapper.
| Returns | |
|---|---|
| Type | Description |
BatchCheckout | new wrapper |
batch_snapshot
batch_snapshot(read_timestamp=None, exact_staleness=None)Return an object which wraps a batch read / query.
| Parameters | |
|---|---|
| Name | Description |
read_timestamp |
Execute all reads at the given timestamp. |
exact_staleness |
Execute all reads at a timestamp that is |
| Returns | |
|---|---|
| Type | Description |
BatchSnapshot | new wrapper |
create
create()Create this database within its instance
Inclues any configured schema assigned to ddl_statements.
| Exceptions | |
|---|---|
| Type | Description |
Conflict | if the database already exists |
NotFound | if the instance owning the database does not exist |
| Returns | |
|---|---|
| Type | Description |
| a future used to poll the status of the create request |
drop
drop()Drop this database.
execute_partitioned_dml
execute_partitioned_dml(dml, params=None, param_types=None, query_options=None)Execute a partitionable DML statement.
| Parameters | |
|---|---|
| Name | Description |
dml |
str
DML 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_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 |
| Returns | |
|---|---|
| Type | Description |
int | Count of rows affected by the DML statement. |
exists
exists()Test whether this database exists.
| Returns | |
|---|---|
| Type | Description |
bool | True if the database exists, else false. |
from_pb
from_pb(database_pb, instance, pool=None)Creates an instance of this class from a protobuf.
| Parameters | |
|---|---|
| Name | Description |
database_pb |
A instance protobuf object. |
instance |
Instance
The instance that owns the database. |
pool |
concrete subclass of AbstractSessionPool.
(Optional) session pool to be used by database. |
| Exceptions | |
|---|---|
| Type | Description |
ValueError | if the instance name does not match the expected format or if the parsed project ID does not match the project ID on the instance's client, or if the parsed instance ID does not match the instance's ID. |
| Returns | |
|---|---|
| Type | Description |
| The database parsed from the protobuf response. |
is_optimized
is_optimized()Test whether this database has finished optimizing.
| Returns | |
|---|---|
| Type | Description |
bool | True if the database state is READY, else False. |
is_ready
is_ready()Test whether this database is ready for use.
| Returns | |
|---|---|
| Type | Description |
bool | True if the database state is READY_OPTIMIZING or READY, else False. |
list_database_operations
list_database_operations(filter_="", page_size=None)List database operations for the database.
| Parameters | |
|---|---|
| Name | Description |
filter_ |
str
Optional. A string specifying a filter for which database operations to list. |
page_size |
int
Optional. The maximum number of operations in each page of results from this request. Non-positive values are ignored. Defaults to a sensible value set by the API. :type: |
reload
reload()Reload this database.
Refresh any configured schema into ddl_statements.
| Exceptions | |
|---|---|
| Type | Description |
NotFound | if the database does not exist |
restore
restore(source)Restore from a backup to this database.
| Parameter | |
|---|---|
| Name | Description |
backup |
Backup
the path of the backup being restored from. |
| Exceptions | |
|---|---|
| Type | Description |
Conflict | if the database already exists |
NotFound | if the instance owning the database does not exist, or if the backup being restored from does not exist |
ValueError | if backup is not set |
| Returns | |
|---|---|
| Type | Description |
| a future used to poll the status of the create request |
run_in_transaction
run_in_transaction(func, *args, **kw)Perform a unit of work in a transaction, retrying on abort.
| Parameters | |
|---|---|
| Name | Description |
args |
tuple
additional positional arguments to be passed to |
kw |
dict
(Optional) keyword arguments to be passed to |
func |
callable
takes a required positional argument, the transaction, and additional positional / keyword arguments as supplied by the caller. |
| Exceptions | |
|---|---|
| Type | Description |
Exception | reraises any non-ABORT execptions raised by func. |
| Returns | |
|---|---|
| Type | Description |
Any | The return value of func. |
session
session(labels=None)Factory to create a session for this database.
| Parameter | |
|---|---|
| Name | Description |
labels |
dict (str -> str) or None
(Optional) user-assigned labels for the session. |
| Returns | |
|---|---|
| Type | Description |
Session | a session bound to this database. |
snapshot
snapshot(**kw)Return an object which wraps a snapshot.
The wrapper must be used as a context manager, with the snapshot as the value returned by the wrapper.
| Parameter | |
|---|---|
| Name | Description |
kw |
dict
Passed through to Snapshot constructor. |
| Returns | |
|---|---|
| Type | Description |
SnapshotCheckout | new wrapper |
update_ddl
update_ddl(ddl_statements, operation_id="")Update DDL for this database.
Apply any configured schema from ddl_statements.
| Parameters | |
|---|---|
| Name | Description |
ddl_statements |
Sequence[str]
a list of DDL statements to use on this database |
operation_id |
str
(optional) a string ID for the long-running operation |
| Exceptions | |
|---|---|
| Type | Description |
NotFound | if the database does not exist |
| Returns | |
|---|---|
| Type | Description |
| an operation instance |