Class Database (7.5.0)

Create a Database object to interact with a Cloud Spanner database.

Inheritance

common_2.GrpcServiceObject > Database

Package

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

Constructors

(constructor)(instance, name, poolOptions, queryOptions)

constructor(instance: Instance, name: string, poolOptions?: SessionPoolConstructor | SessionPoolOptions, queryOptions?: spannerClient.spanner.v1.ExecuteSqlRequest.IQueryOptions);

Constructs a new instance of the Database class

Parameters
Name	Description
`instance`	`Instance`
`name`	`string`
`poolOptions`	`SessionPoolConstructor \| SessionPoolOptions`
`queryOptions`	`IQueryOptions`

Properties

databaseRole

databaseRole?: string | null;

formattedName_

formattedName_: string;

pool_

pool_: SessionPoolInterface;

queryOptions_

queryOptions_?: spannerClient.spanner.v1.ExecuteSqlRequest.IQueryOptions;

request

request: DatabaseRequest;

resourceHeader_

resourceHeader_: {
        [k: string]: string;
    };

Methods

_runPartitionedUpdate(session, query, callback)

_runPartitionedUpdate(session: Session, query: string | ExecuteSqlRequest, callback?: RunUpdateCallback): void | Promise<number>;

Parameters
Name	Description
`session`	`Session`
`query`	`string \| ExecuteSqlRequest`
`callback`	`RunUpdateCallback`

Returns
Type	Description
`void \| Promise<number>`

batchCreateSessions(options)

batchCreateSessions(options: number | BatchCreateSessionsOptions): Promise<BatchCreateSessionsResponse>;

Create a batch of sessions, which can be used to perform transactions that read and/or modify data.

**It is unlikely you will need to interact with sessions directly. By default, sessions are created and utilized for maximum performance automatically.**

Wrapper around .

Parameter
Name	Description
`options`	`number \| BatchCreateSessionsOptions` Desired session count or a configuration object.

Returns

Type Description

Promise<BatchCreateSessionsResponse>

{Promise

Examples


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

const count = 5;

database.batchCreateSession(count, (err, sessions, response) => {
  if (err) {
    // Error handling omitted.
  }

  // `sessions` is an array of Session objects.
});

If the callback is omitted, we'll return a Promise.


const [sessions, response] = await database.batchCreateSessions(count);

batchCreateSessions(options, callback)

batchCreateSessions(options: number | BatchCreateSessionsOptions, callback: BatchCreateSessionsCallback): void;

Parameters
Name	Description
`options`	`number \| BatchCreateSessionsOptions`
`callback`	`BatchCreateSessionsCallback`

Returns
Type	Description
`void`

batchTransaction(identifier, options)

batchTransaction(identifier: TransactionIdentifier, options?: TimestampBounds): BatchTransaction;

Get a reference to a object.

Parameters
Name	Description
`identifier`	`TransactionIdentifier` The transaction identifier.
`options`	`TimestampBounds` [Transaction options](https://cloud.google.com/spanner/docs/timestamp-bounds).

Returns
Type	Description
`BatchTransaction`	{BatchTransaction} A batch transaction object.

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

const transaction = database.batchTransaction({
  session: 'my-session',
  transaction: 'my-transaction',
  readTimestamp: 1518464696657
});

close(callback)

close(callback: SessionPoolCloseCallback): void;

Close the database connection and destroy all sessions associated with it.

Parameter
Name	Description
`callback`	`SessionPoolCloseCallback` Callback function.

Returns
Type	Description
`void`	{Promise}

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.close(function(err) {
  if (err) {
    // Error handling omitted.
  }
});

//-
// In the event of a session leak, the error object will contain a
// `messages` field.
//-
database.close(function(err) {
  if (err && err.messages) {
    err.messages.forEach(function(message) {
      console.error(message);
    });
  }
});

close()

close(): Promise<DatabaseCloseResponse>;

Returns
Type	Description
`Promise<DatabaseCloseResponse>`

createBatchTransaction(options)

createBatchTransaction(options?: TimestampBounds): Promise<CreateBatchTransactionResponse>;

Create a transaction that can be used for batch querying.

Parameter
Name	Description
`options`	`TimestampBounds` [Transaction options](https://cloud.google.com/spanner/docs/timestamp-bounds).

Returns

Type Description

Promise<CreateBatchTransactionResponse>

{Promise

createBatchTransaction(callback)

createBatchTransaction(callback: CreateBatchTransactionCallback): void;

Parameter
Name	Description
`callback`	`CreateBatchTransactionCallback`

Returns
Type	Description
`void`

createBatchTransaction(options, callback)

createBatchTransaction(options: TimestampBounds, callback: CreateBatchTransactionCallback): void;

Parameters
Name	Description
`options`	`TimestampBounds`
`callback`	`CreateBatchTransactionCallback`

Returns
Type	Description
`void`

createSession(options)

createSession(options: CreateSessionOptions): Promise<CreateSessionResponse>;

Create a new session, which can be used to perform transactions that read and/or modify data.

Sessions can only execute one transaction at a time. To execute multiple concurrent read-write/write-only transactions, create multiple sessions. Note that standalone reads and queries use a transaction internally, and count toward the one transaction limit.

**It is unlikely you will need to interact with sessions directly. By default, sessions are created and utilized for maximum performance automatically.**

Wrapper around .

Parameter
Name	Description
`options`	`CreateSessionOptions` Configuration object.

Returns

Type Description

Promise<CreateSessionResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.createSession(function(err, session, apiResponse) {
  if (err) {
    // Error handling omitted.
  }

  // `session` is a Session object.
});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.createSession().then(function(data) {
  const session = data[0];
  const apiResponse = data[1];
});

createSession(callback)

createSession(callback: CreateSessionCallback): void;

Parameter
Name	Description
`callback`	`CreateSessionCallback`

Returns
Type	Description
`void`

createSession(options, callback)

createSession(options: CreateSessionOptions, callback: CreateSessionCallback): void;

Parameters
Name	Description
`options`	`CreateSessionOptions`
`callback`	`CreateSessionCallback`

Returns
Type	Description
`void`

createTable(schema, gaxOptions)

createTable(schema: Schema, gaxOptions?: CallOptions): Promise<CreateTableResponse>;

Create a table.

Wrapper around .

Parameters
Name	Description
`schema`	`Schema` A DDL CREATE statement describing the table.
`gaxOptions`	`CallOptions` Request configuration options, See CallOptions for more details.

Returns

Type Description

Promise<CreateTableResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

const schema =
  'CREATE TABLE Singers (' +
  '  SingerId INT64 NOT NULL,' +
  '  FirstName STRING(1024),' +
  '  LastName STRING(1024),' +
  '  SingerInfo BYTES(MAX),' +
  ') PRIMARY KEY(SingerId)';

database.createTable(schema, function(err, table, operation, apiResponse) {
  if (err) {
    // Error handling omitted.
  }

  operation
    .on('error', function(err) {})
    .on('complete', function() {
      // Table created successfully.
    });
});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.createTable(schema)
  .then(function(data) {
    const table = data[0];
    const operation = data[1];

    return operation.promise();
  })
  .then(function() {
    // Table created successfully.
  });

createTable(schema, callback)

createTable(schema: Schema, callback: CreateTableCallback): void;

Parameters
Name	Description
`schema`	`Schema`
`callback`	`CreateTableCallback`

Returns
Type	Description
`void`

createTable(schema, gaxOptions, callback)

createTable(schema: Schema, gaxOptions: CallOptions, callback: CreateTableCallback): void;

Parameters
Name	Description
`schema`	`Schema`
`gaxOptions`	`CallOptions`
`callback`	`CreateTableCallback`

Returns
Type	Description
`void`

delete(gaxOptions)

delete(gaxOptions?: CallOptions): Promise<DatabaseDeleteResponse>;

Delete the database.

Wrapper around .

Parameter
Name	Description
`gaxOptions`	`CallOptions` Request configuration options, See CallOptions for more details.

Returns

Type Description

Promise<DatabaseDeleteResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.delete(function(err, apiResponse) {
  if (err) {
    // Error handling omitted.
  }

  // Database was deleted successfully.
});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.delete().then(function(data) {
  const apiResponse = data[0];
});

delete(callback)

delete(callback: DatabaseDeleteCallback): void;

Parameter
Name	Description
`callback`	`DatabaseDeleteCallback`

Returns
Type	Description
`void`

delete(gaxOptions, callback)

delete(gaxOptions: CallOptions, callback: DatabaseDeleteCallback): void;

Parameters
Name	Description
`gaxOptions`	`CallOptions`
`callback`	`DatabaseDeleteCallback`

Returns
Type	Description
`void`

exists(gaxOptions)

exists(gaxOptions?: CallOptions): Promise<[boolean]>;

Check if a database exists.

Database#exists

Parameter
Name	Description
`gaxOptions`	`CallOptions` Request configuration options, See CallOptions for more details.

Returns

Type Description

Promise<[boolean]>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.exists(function(err, exists) {});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.exists().then(function(data) {
  const exists = data[0];
});

exists(callback)

exists(callback: ExistsCallback): void;

Parameter
Name	Description
`callback`	`ExistsCallback`

Returns
Type	Description
`void`

exists(gaxOptions, callback)

exists(gaxOptions: CallOptions, callback: ExistsCallback): void;

Parameters
Name	Description
`gaxOptions`	`CallOptions`
`callback`	`ExistsCallback`

Returns
Type	Description
`void`

formatName_(instanceName, name)

static formatName_(instanceName: string, name: string): string;

Format the database name to include the instance name.

Parameters
Name	Description
`instanceName`	`string` The formatted instance name.
`name`	`string` The table name.

Returns
Type	Description
`string`	{string}

Example


Database.formatName_(
  'projects/grape-spaceship-123/instances/my-instance',
  'my-database'
);
// 'projects/grape-spaceship-123/instances/my-instance/databases/my-database'

get(options)

get(options?: GetDatabaseConfig): Promise<DatabaseResponse>;

Get a database if it exists.

You may optionally use this to "get or create" an object by providing an object with autoCreate set to true. Any extra configuration that is normally required for the create method must be contained within this object as well.

Parameter
Name	Description
`options`	`GetDatabaseConfig` Configuration object.

Returns

Type Description

Promise<DatabaseResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.get(function(err, database, apiResponse) {
  // `database.metadata` has been populated.
});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.get().then(function(data) {
  const database = data[0];
  const apiResponse = data[0];
});

get(callback)

get(callback: DatabaseCallback): void;

Parameter
Name	Description
`callback`	`DatabaseCallback`

Returns
Type	Description
`void`

get(options, callback)

get(options: GetDatabaseConfig, callback: DatabaseCallback): void;

Parameters
Name	Description
`options`	`GetDatabaseConfig`
`callback`	`DatabaseCallback`

Returns
Type	Description
`void`

getDatabaseRoles(gaxOptions)

getDatabaseRoles(gaxOptions?: CallOptions): Promise<GetDatabaseRolesResponse>;

Gets a list of database roles

Parameter
Name	Description
`gaxOptions`	`CallOptions` Request configuration options, See CallOptions for more details.

Returns

Type Description

Promise<GetDatabaseRolesResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.getDatabaseRoles(function(err, roles) {
  // `roles` is an array of `DatabaseRoles` objects.
});

//-
// To control how many API requests are made and page through the results
// manually, set `autoPaginate` to `false`.
//-
function callback(err, roles, nextQuery, apiResponse) {
  if (nextQuery) {
    // More results exist.
    database.getDatabaseRoles(nextQuery, callback);
  }
}

database.getInstances({
  gaxOptions: {autoPaginate: false}
}, callback);

//-
// If the callback is omitted, we'll return a Promise.
//-
database.getInstances().then(function(data) {
  const roles = data[0];
});

getDatabaseRoles(callback)

getDatabaseRoles(callback: GetDatabaseRolesCallback): void;

Parameter
Name	Description
`callback`	`GetDatabaseRolesCallback`

Returns
Type	Description
`void`

getDatabaseRoles(gaxOptions, callback)

getDatabaseRoles(gaxOptions: CallOptions, callback: GetDatabaseRolesCallback): void;

Parameters
Name	Description
`gaxOptions`	`CallOptions`
`callback`	`GetDatabaseRolesCallback`

Returns
Type	Description
`void`

getEnvironmentQueryOptions()

static getEnvironmentQueryOptions(): databaseAdmin.spanner.v1.ExecuteSqlRequest.IQueryOptions;

Returns
Type	Description
`IQueryOptions`

getIamPolicy(options)

getIamPolicy(options?: GetIamPolicyOptions): Promise<GetIamPolicyResponse>;

Retrieves the policy of the database.

A Policy is a collection of bindings. A binding binds one or more members, or principals, to a single role. Principals can be user accounts, service accounts, Google groups, and domains (such as G Suite). A role is a named list of permissions; each role can be an IAM predefined role or a user-created custom role.

Parameter
Name	Description
`options`	`GetIamPolicyOptions` requestedPolicyVersion and gax options(configuration options) See https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html for more details on gax options.

Returns
Type	Description
`Promise<GetIamPolicyResponse>`	{Promise<Policy \| undefined>} When resolved, contains the current policy of the database.

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const database = instance.database('my-database');
const policy = await database.getIamPolicy();
console.log(policy.bindings, policy.version, policy.etag, policy.auditConfigs)
const policyWithVersion specified = await database.getIamPolicy({requestedPolicyVersion: 3});

getIamPolicy(callback)

getIamPolicy(callback: GetIamPolicyCallback): void;

Parameter
Name	Description
`callback`	`GetIamPolicyCallback`

Returns
Type	Description
`void`

getIamPolicy(options, callback)

getIamPolicy(options: GetIamPolicyOptions, callback: GetIamPolicyCallback): void;

Parameters
Name	Description
`options`	`GetIamPolicyOptions`
`callback`	`GetIamPolicyCallback`

Returns
Type	Description
`void`

getMetadata(gaxOptions)

getMetadata(gaxOptions?: CallOptions): Promise<GetDatabaseMetadataResponse>;

Get the database's metadata.

Wrapper around .

Parameter
Name	Description
`gaxOptions`	`CallOptions` Request configuration options, See CallOptions for more details.

Returns

Type Description

Promise<GetDatabaseMetadataResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.getMetadata(function(err, metadata) {
  if (err) {
    // Error handling omitted.
  }

  // Database was deleted successfully.
});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.getMetadata().then(function(data) {
  const metadata = data[0];
  const apiResponse = data[1];
});

getMetadata(callback)

getMetadata(callback: GetDatabaseMetadataCallback): void;

Parameter
Name	Description
`callback`	`GetDatabaseMetadataCallback`

Returns
Type	Description
`void`

getMetadata(gaxOptions, callback)

getMetadata(gaxOptions: CallOptions, callback: GetDatabaseMetadataCallback): void;

Parameters
Name	Description
`gaxOptions`	`CallOptions`
`callback`	`GetDatabaseMetadataCallback`

Returns
Type	Description
`void`

getOperations(options)

getOperations(options?: GetDatabaseOperationsOptions): Promise<GetDatabaseOperationsResponse>;

List pending and completed operations for the database.

Parameter
Name	Description
`options`	`GetDatabaseOperationsOptions` Contains query object for listing database operations and request configuration options, See CallOptions for more details.

Returns

Type Description

Promise<GetDatabaseOperationsResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const database = instance.database('my-database');
const [operations] = await database.getOperations();

//-
// To manually handle pagination, set autoPaginate:false in gaxOptions.
//-
let pageToken = undefined;
do {
  const [operations, , response] = await database.getOperations({
    pageSize: 3,
    pageToken,
    gaxOptions: {autoPaginate: false},
  });
  operations.forEach(operation => {
    // Do something with operation
  });
  pageToken = response.nextPageToken;
} while (pageToken);

getOperations(callback)

getOperations(callback: GetDatabaseOperationsCallback): void;

Parameter
Name	Description
`callback`	`GetDatabaseOperationsCallback`

Returns
Type	Description
`void`

getOperations(options, callback)

getOperations(options: GetDatabaseOperationsOptions, callback: GetDatabaseOperationsCallback): void;

Parameters
Name	Description
`options`	`GetDatabaseOperationsOptions`
`callback`	`GetDatabaseOperationsCallback`

Returns
Type	Description
`void`

getRestoreInfo(options)

getRestoreInfo(options?: CallOptions): Promise<IRestoreInfoTranslatedEnum | undefined>;

Retrieves the restore information of the database.

Parameter
Name	Description
`options`	`CallOptions`

Returns
Type	Description
`Promise<IRestoreInfoTranslatedEnum \| undefined>`	{Promise<IRestoreInfoTranslatedEnum \| undefined>} When resolved, contains the restore information for the database if it was restored from a backup.

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const database = instance.database('my-database');
const restoreInfo = await database.getRestoreInfo();
console.log(`Database restored from ${restoreInfo.backupInfo.backup}`);

getRestoreInfo(callback)

getRestoreInfo(callback: GetRestoreInfoCallback): void;

Parameter
Name	Description
`callback`	`GetRestoreInfoCallback`

Returns
Type	Description
`void`

getRestoreInfo(options, callback)

getRestoreInfo(options: CallOptions, callback: GetRestoreInfoCallback): void;

Parameters
Name	Description
`options`	`CallOptions`
`callback`	`GetRestoreInfoCallback`

Returns
Type	Description
`void`

getSchema(options)

getSchema(options?: CallOptions): Promise<GetSchemaResponse>;

Get this database's schema as a list of formatted DDL statements.

Wrapper around .

Parameter
Name	Description
`options`	`CallOptions`

Returns

Type Description

Promise<GetSchemaResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.getSchema(function(err, statements, apiResponse) {});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.getSchema().then(function(data) {
  const statements = data[0];
  const apiResponse = data[1];
});

getSchema(callback)

getSchema(callback: GetSchemaCallback): void;

Parameter
Name	Description
`callback`	`GetSchemaCallback`

Returns
Type	Description
`void`

getSchema(options, callback)

getSchema(options: CallOptions, callback: GetSchemaCallback): void;

Parameters
Name	Description
`options`	`CallOptions`
`callback`	`GetSchemaCallback`

Returns
Type	Description
`void`

getSessions(options)

getSessions(options?: GetSessionsOptions): Promise<GetSessionsResponse>;

Gets a list of sessions.

Wrapper around

Parameter
Name	Description
`options`	`GetSessionsOptions` Options object for listing sessions.

Returns

Type Description

Promise<GetSessionsResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.getSessions(function(err, sessions) {
  // `sessions` is an array of `Session` objects.
});

//-
// To control how many API requests are made and page through the results
// manually, set `autoPaginate` to `false`.
//-
function callback(err, sessions, nextQuery, apiResponse) {
  if (nextQuery) {
    // More results exist.
    database.getSessions(nextQuery, callback);
  }
}

database.getInstances({
  gaxOptions: {autoPaginate: false}
}, callback);

//-
// If the callback is omitted, we'll return a Promise.
//-
database.getInstances().then(function(data) {
  const sessions = data[0];
});

getSessions(callback)

getSessions(callback: GetSessionsCallback): void;

Parameter
Name	Description
`callback`	`GetSessionsCallback`

Returns
Type	Description
`void`

getSessions(options, callback)

getSessions(options: GetSessionsOptions, callback: GetSessionsCallback): void;

Parameters
Name	Description
`options`	`GetSessionsOptions`
`callback`	`GetSessionsCallback`

Returns
Type	Description
`void`

getSessionsStream(options)

getSessionsStream(options?: GetSessionsOptions): NodeJS.ReadableStream;

Get a list of sessions as a readable object stream.

Wrapper around

Parameter
Name	Description
`options`	`GetSessionsOptions` Options object for listing sessions.

Returns
Type	Description
`NodeJS.ReadableStream`	{ReadableStream} A readable stream that emits Session instances.

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.getSessionsStream()
  .on('error', console.error)
  .on('data', function(database) {
    // `sessions` is a `Session` object.
  })
  .on('end', function() {
    // All sessions retrieved.
  });

//-
// If you anticipate many results, you can end a stream early to prevent
// unnecessary processing and API requests.
//-
database.getSessionsStream()
  .on('data', function(session) {
    this.end();
  });

getSnapshot(options)

getSnapshot(options?: TimestampBounds): Promise<[Snapshot]>;

Get a read only Snapshot transaction.

Wrapper around .

**NOTE:** When finished with the Snapshot, should be called to release the underlying Session. **Failure to do could result in a Session leak.**

**NOTE:** Since the returned Snapshot transaction is not a single-use transaction, it is invalid to set the minReadTimestamp and maxStaleness parameters in as those parameters can only be set for single-use transactions. https://cloud.google.com/spanner/docs/reference/rest/v1/TransactionOptions#bounded-staleness

Parameter
Name	Description
`options`	`TimestampBounds` Timestamp bounds.

Returns

Type Description

Promise<[Snapshot]>

{Promise

Examples


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.getSnapshot(function(err, transaction) {
  if (err) {
   // Error handling omitted.
  }

  // Should be called when finished with Snapshot.
  transaction.end();
});

If the callback is omitted, we'll return a Promise.


database.getSnapshot().then(function(data) {
  const transaction = data[0];
});

Read-only transaction:


  // Imports the Google Cloud client library
  const {Spanner} = require('@google-cloud/spanner');

  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const projectId = 'my-project-id';
  // const instanceId = 'my-instance';
  // const databaseId = 'my-database';

  // Creates a client
  const spanner = new Spanner({
    projectId: projectId,
  });

  // Gets a reference to a Cloud Spanner instance and database
  const instance = spanner.instance(instanceId);
  const database = instance.database(databaseId);

  // Gets a transaction object that captures the database state
  // at a specific point in time
  database.getSnapshot(async (err, transaction) => {
    if (err) {
      console.error(err);
      return;
    }
    const queryOne = 'SELECT SingerId, AlbumId, AlbumTitle FROM Albums';

    try {
      // Read #1, using SQL
      const [qOneRows] = await transaction.run(queryOne);

      qOneRows.forEach(row => {
        const json = row.toJSON();
        console.log(
          `SingerId: ${json.SingerId}, AlbumId: ${json.AlbumId}, AlbumTitle: ${json.AlbumTitle}`
        );
      });

      const queryTwo = {
        columns: ['SingerId', 'AlbumId', 'AlbumTitle'],
      };

      // Read #2, using the `read` method. Even if changes occur
      // in-between the reads, the transaction ensures that both
      // return the same data.
      const [qTwoRows] = await transaction.read('Albums', queryTwo);

      qTwoRows.forEach(row => {
        const json = row.toJSON();
        console.log(
          `SingerId: ${json.SingerId}, AlbumId: ${json.AlbumId}, AlbumTitle: ${json.AlbumTitle}`
        );
      });

      console.log('Successfully executed read-only transaction.');
    } catch (err) {
      console.error('ERROR:', err);
    } finally {
      transaction.end();
      // Close the database when finished.
      await database.close();
    }
  });

getSnapshot(callback)

getSnapshot(callback: GetSnapshotCallback): void;

Parameter
Name	Description
`callback`	`GetSnapshotCallback`

Returns
Type	Description
`void`

getSnapshot(options, callback)

getSnapshot(options: TimestampBounds, callback: GetSnapshotCallback): void;

Parameters
Name	Description
`options`	`TimestampBounds`
`callback`	`GetSnapshotCallback`

Returns
Type	Description
`void`

getState(options)

getState(options?: CallOptions): Promise<EnumKey<typeof databaseAdmin.spanner.admin.database.v1.Database.State> | undefined>;

Retrieves the state of the database.

The database state indicates if the database is ready after creation or after being restored from a backup.

Parameter
Name	Description
`options`	`CallOptions`

Returns
Type	Description
`Promise<EnumKey<typeof databaseAdmin.spanner.admin.database.v1.Database.State> \| undefined>`	{Promise<EnumKey<typeof, google.spanner.admin.database.v1.Database.State> \| undefined>} When resolved, contains the current state of the database if the state is defined.

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const database = instance.database('my-database');
const state = await database.getState();
const isReady = (state === 'READY');

getState(callback)

getState(callback: GetStateCallback): void;

Parameter
Name	Description
`callback`	`GetStateCallback`

Returns
Type	Description
`void`

getState(options, callback)

getState(options: CallOptions, callback: GetStateCallback): void;

Parameters
Name	Description
`options`	`CallOptions`
`callback`	`GetStateCallback`

Returns
Type	Description
`void`

getTransaction()

getTransaction(): Promise<[Transaction]>;

Get a read/write ready Transaction object.

**NOTE:** In the event that you encounter an error while reading/writing, if you decide to forgo calling or , then you need to call to release the underlying Session object. **Failure to do could result in a Session leak.**

Wrapper around .

Returns

Type Description

Promise<[Transaction]>

{Promise

Examples


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.getTransaction(function(err, transaction) {});

If the callback is omitted, we'll return a Promise.


database.getTransaction().then(function(data) {
  const transaction = data[0];
});

getTransaction(callback)

getTransaction(callback: GetTransactionCallback): void;

Parameter
Name	Description
`callback`	`GetTransactionCallback`

Returns
Type	Description
`void`

makePooledRequest_(config)

makePooledRequest_(config: RequestConfig): Promise<Session>;

Make an API request, first assuring an active session is used.

Parameter
Name	Description
`config`	`RequestConfig` Request config

Returns
Type	Description
`Promise<Session>`

makePooledRequest_(config, callback)

makePooledRequest_(config: RequestConfig, callback: PoolRequestCallback): void;

Parameters
Name	Description
`config`	`RequestConfig`
`callback`	`PoolRequestCallback`

Returns
Type	Description
`void`

makePooledStreamingRequest_(config)

makePooledStreamingRequest_(config: RequestConfig): Readable;

Make an API request as a stream, first assuring an active session is used.

Parameter
Name	Description
`config`	`RequestConfig` Request config

Returns
Type	Description
`Readable`	{Stream}

restore(backupPath)

restore(backupPath: string): Promise<RestoreDatabaseResponse>;

Restore a backup into this database.

When this call completes, the restore will have commenced but will not necessarily have completed.

Parameter
Name	Description
`backupPath`	`string` The path of the backup to restore.

Returns

Type Description

Promise<RestoreDatabaseResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const database = instance.database('my-database');
const backupName = 'projects/my-project/instances/my-instance/backups/my-backup';
const [, restoreOperation] = await database.restore(backupName);
// Wait for restore to complete
await restoreOperation.promise();

//-
// Restore database with a different encryption key to the one used by the
// backup.
//-
const [, restoreWithKeyOperation] = await database.restore(
  backupName,
  {
    encryptionConfig: {
      encryptionType: 'CUSTOMER_MANAGED_ENCRYPTION',
      kmsKeyName: 'projects/my-project-id/my-region/keyRings/my-key-ring/cryptoKeys/my-key',
    }
  },
);
// Wait for restore to complete
await restoreWithKeyOperation.promise();

restore(backupPath, options)

restore(backupPath: string, options?: RestoreOptions | CallOptions): Promise<RestoreDatabaseResponse>;

Parameters
Name	Description
`backupPath`	`string`
`options`	`RestoreOptions \| CallOptions`

Returns
Type	Description
`Promise<RestoreDatabaseResponse>`

restore(backupPath, callback)

restore(backupPath: string, callback: RestoreDatabaseCallback): void;

Parameters
Name	Description
`backupPath`	`string`
`callback`	`RestoreDatabaseCallback`

Returns
Type	Description
`void`

restore(backupPath, options, callback)

restore(backupPath: string, options: RestoreOptions | CallOptions, callback: RestoreDatabaseCallback): void;

Parameters
Name	Description
`backupPath`	`string`
`options`	`RestoreOptions \| CallOptions`
`callback`	`RestoreDatabaseCallback`

Returns
Type	Description
`void`

run(query)

run(query: string | ExecuteSqlRequest): Promise<RunResponse>;

Execute a SQL statement on this database.

Wrapper around .

Parameter
Name	Description
`query`	`string \| ExecuteSqlRequest` A SQL query or object.

Returns

Type Description

Promise<RunResponse>

{Promise

Examples


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

const query = 'SELECT * FROM Singers';

database.run(query, function(err, rows) {
  if (err) {
    // Error handling omitted.
  }

  const firstRow = rows[0];

  // firstRow = [
  //   {
  //     name: 'SingerId',
  //     value: '1'
  //   },
  //   {
  //     name: 'Name',
  //     value: 'Eddie Wilson'
  //   }
  // ]
});

//-
// Rows are returned as an array of object arrays. Each object has a `name`
// and `value` property. To get a serialized object, call `toJSON()`.
//-
database.run(query, function(err, rows) {
  if (err) {
    // Error handling omitted.
  }

  const firstRow = rows[0];

  // firstRow.toJSON() = {
  //   SingerId: '1',
  //   Name: 'Eddie Wilson'
  // }
});

//-
// Alternatively, set `query.json` to `true`, and this step will be performed
// automatically.
//-
database.run(query, function(err, rows) {
  if (err) {
    // Error handling omitted.
  }

  const firstRow = rows[0];

  // firstRow = {
  //   SingerId: '1',
  //   Name: 'Eddie Wilson'
  // }
});

//-
// The SQL query string can contain parameter placeholders. A parameter
// placeholder consists of '@' followed by the parameter name.
//-
const query = {
  sql: 'SELECT * FROM Singers WHERE name = @name',
  params: {
    name: 'Eddie Wilson'
  }
};

database.run(query, function(err, rows) {});

//-
// If you need to enforce a specific param type, a types map can be provided.
// This is typically useful if your param value can be null.
//-
const query = {
  sql: 'SELECT * FROM Singers WHERE name = @name AND id = @id',
  params: {
    id: spanner.int(8),
    name: null
  },
  types: {
    id: 'int64',
    name: 'string'
  }
};

database.run(query, function(err, rows) {});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.run(query).then(function(data) {
  const rows = data[0];
});

Full example:


  // Imports the Google Cloud client library
  const {Spanner} = require('@google-cloud/spanner');

  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const projectId = 'my-project-id';
  // const instanceId = 'my-instance';
  // const databaseId = 'my-database';

  // Creates a client
  const spanner = new Spanner({
    projectId: projectId,
  });

  // Gets a reference to a Cloud Spanner instance and database
  const instance = spanner.instance(instanceId);
  const database = instance.database(databaseId);

  const query = {
    sql: 'SELECT SingerId, AlbumId, AlbumTitle FROM Albums',
  };

  // Queries rows from the Albums table
  try {
    const [rows] = await database.run(query);

    rows.forEach(row => {
      const json = row.toJSON();
      console.log(
        `SingerId: ${json.SingerId}, AlbumId: ${json.AlbumId}, AlbumTitle: ${json.AlbumTitle}`
      );
    });
  } catch (err) {
    console.error('ERROR:', err);
  } finally {
    // Close the database when finished.
    await database.close();
  }

Querying data with an index:


  // Imports the Google Cloud client library
  const {Spanner} = require('@google-cloud/spanner');

  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const projectId = 'my-project-id';
  // const instanceId = 'my-instance';
  // const databaseId = 'my-database';
  // const startTitle = 'Ardvark';
  // const endTitle = 'Goo';

  // Creates a client
  const spanner = new Spanner({
    projectId: projectId,
  });

  // Gets a reference to a Cloud Spanner instance and database
  const instance = spanner.instance(instanceId);
  const database = instance.database(databaseId);

  const query = {
    sql: `SELECT AlbumId, AlbumTitle, MarketingBudget
          FROM Albums@{FORCE_INDEX=AlbumsByAlbumTitle}
          WHERE AlbumTitle >= @startTitle AND AlbumTitle <= @endtitle`,="" params:="" {="" starttitle:="" starttitle,="" endtitle:="" endtitle,="" },="" };="" queries="" rows="" from="" the="" albums="" table="" try="" {="" const="" [rows]="await" database.run(query);="" rows.foreach(row=""> {
      const json = row.toJSON();
      const marketingBudget = json.MarketingBudget
        ? json.MarketingBudget
        : null; // This value is nullable
      console.log(
        `AlbumId: ${json.AlbumId}, AlbumTitle: ${json.AlbumTitle}, MarketingBudget: ${marketingBudget}`
      );
    });
  } catch (err) {
    console.error('ERROR:', err);
  } finally {
    // Close the database when finished.
    database.close();
  }

run(query, options)

run(query: string | ExecuteSqlRequest, options?: TimestampBounds): Promise<RunResponse>;

Parameters
Name	Description
`query`	`string \| ExecuteSqlRequest`
`options`	`TimestampBounds`

Returns
Type	Description
`Promise<RunResponse>`

run(query, callback)

run(query: string | ExecuteSqlRequest, callback: RunCallback): void;

Parameters
Name	Description
`query`	`string \| ExecuteSqlRequest`
`callback`	`RunCallback`

Returns
Type	Description
`void`

run(query, options, callback)

run(query: string | ExecuteSqlRequest, options: TimestampBounds, callback: RunCallback): void;

Parameters
Name	Description
`query`	`string \| ExecuteSqlRequest`
`options`	`TimestampBounds`
`callback`	`RunCallback`

Returns
Type	Description
`void`

runPartitionedUpdate(query)

runPartitionedUpdate(query: string | ExecuteSqlRequest): Promise<[number]>;

Partitioned DML transactions are used to execute DML statements with a different execution strategy that provides different, and often better, scalability properties for large, table-wide operations than DML in a Transaction transaction. Smaller scoped statements, such as an OLTP workload, should prefer using Transaction transactions.

Parameter
Name	Description
`query`	`string \| ExecuteSqlRequest` A DML statement or object.

Returns

Type Description

Promise<[number]>

{Promise

runPartitionedUpdate(query, callback)

runPartitionedUpdate(query: string | ExecuteSqlRequest, callback?: RunUpdateCallback): void;

Parameters
Name	Description
`query`	`string \| ExecuteSqlRequest`
`callback`	`RunUpdateCallback`

Returns
Type	Description
`void`

runStream(query, options)

runStream(query: string | ExecuteSqlRequest, options?: TimestampBounds): PartialResultStream;

Create a readable object stream to receive resulting rows from a SQL statement.

Wrapper around .

Parameters
Name	Description
`query`	`string \| ExecuteSqlRequest` A SQL query or object.
`options`	`TimestampBounds` Snapshot timestamp bounds.

Returns
Type	Description
`PartialResultStream`	{PartialResultStream} A readable stream that emits rows.

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

const query = 'SELECT * FROM Singers';

database.runStream(query)
  .on('error', function(err) {})
  .on('data', function(row) {
    // row = [
    //   {
    //     name: 'SingerId',
    //     value: '1'
    //   },
    //   {
    //     name: 'Name',
    //     value: 'Eddie Wilson'
    //   }
    // ]
  // ]
  })
  .on('end', function() {
    // All results retrieved.
  });

//-
// Rows are returned as an array of objects. Each object has a `name` and
// `value` property. To get a serialized object, call `toJSON()`.
//-
database.runStream(query)
  .on('error', function(err) {})
  .on('data', function(row) {
    // row.toJSON() = {
    //   SingerId: '1',
    //   Name: 'Eddie Wilson'
    // }
  })
  .on('end', function() {
    // All results retrieved.
  });

//-
// Alternatively, set `query.json` to `true`, and this step will be performed
// automatically.
//-
query.json = true;

database.runStream(query)
  .on('error', function(err) {})
  .on('data', function(row) {
    // row = {
    //   SingerId: '1',
    //   Name: 'Eddie Wilson'
    // }
  })
  .on('end', function() {
    // All results retrieved.
  });

//-
// The SQL query string can contain parameter placeholders. A parameter
// placeholder consists of '@' followed by the parameter name.
//-
const query = {
  sql: 'SELECT * FROM Singers WHERE name = @name',
  params: {
    name: 'Eddie Wilson'
  }
};

database.runStream(query)
  .on('error', function(err) {})
  .on('data', function(row) {})
  .on('end', function() {});

//-
// If you need to enforce a specific param type, a types map can be provided.
// This is typically useful if your param value can be null.
//-
const query = {
  sql: 'SELECT * FROM Singers WHERE name = @name',
  params: {
    name: 'Eddie Wilson'
  },
  types: {
    name: 'string'
  }
};

database.runStream(query)
  .on('error', function(err) {})
  .on('data', function(row) {})
  .on('end', function() {});

//-
// If you anticipate many results, you can end a stream early to prevent
// unnecessary processing and API requests.
//-
database.runStream(query)
  .on('data', function(row) {
    this.end();
  });

runTransaction(runFn)

runTransaction(runFn: RunTransactionCallback): void;

A transaction in Cloud Spanner is a set of reads and writes that execute atomically at a single logical point in time across columns, rows, and tables in a database.

Note that Cloud Spanner does not support nested transactions. If a new transaction is started inside of the run function, it will be an independent transaction.

The callback you provide to this function will become the "run function". It will be executed with either an error or a Transaction object. The Transaction object will let you run queries and queue mutations until you are ready to .

In the event that an aborted error occurs, we will re-run the runFn in its entirety. If you prefer to handle aborted errors for yourself please refer to .

For a more complete listing of functionality available to a Transaction, see the Transaction API documentation. For a general overview of transactions within Cloud Spanner, see [Transactions](https://cloud.google.com/spanner/docs/transactions) from the official Cloud Spanner documentation.

If you would like to run a transaction and receive a promise or use async/await, use .

Parameter
Name	Description
`runFn`	`RunTransactionCallback`

Returns
Type	Description
`void`

Examples


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

database.runTransaction(function(err, transaction) {
  if (err) {
    // Error handling omitted.
  }

  // Run a transactional query.
  transaction.run('SELECT * FROM Singers', function(err, rows) {
    if (err) {
      // Error handling omitted.
    }

    // Queue a mutation (note that there is no callback passed to `insert`).
    transaction.insert('Singers', {
      SingerId: 'Id3b',
      Name: 'Joe West'
    });

    // Commit the transaction.
    transaction.commit(function(err) {
      if (!err) {
        // Transaction committed successfully.
      }
    });
  });
});

Read-write transaction:


  // This sample transfers 200,000 from the MarketingBudget field
  // of the second Album to the first Album, as long as the second
  // Album has enough money in its budget. Make sure to run the
  // addColumn and updateData samples first (in that order).

  // Imports the Google Cloud client library
  const {Spanner} = require('@google-cloud/spanner');

  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const projectId = 'my-project-id';
  // const instanceId = 'my-instance';
  // const databaseId = 'my-database';

  // Creates a client
  const spanner = new Spanner({
    projectId: projectId,
  });

  // Gets a reference to a Cloud Spanner instance and database
  const instance = spanner.instance(instanceId);
  const database = instance.database(databaseId);

  const transferAmount = 200000;

  database.runTransaction(async (err, transaction) => {
    if (err) {
      console.error(err);
      return;
    }
    let firstBudget, secondBudget;
    const queryOne = {
      columns: ['MarketingBudget'],
      keys: [[2, 2]], // SingerId: 2, AlbumId: 2
    };

    const queryTwo = {
      columns: ['MarketingBudget'],
      keys: [[1, 1]], // SingerId: 1, AlbumId: 1
    };

    Promise.all([
      // Reads the second album's budget
      transaction.read('Albums', queryOne).then(results => {
        // Gets second album's budget
        const rows = results[0].map(row => row.toJSON());
        secondBudget = rows[0].MarketingBudget;
        console.log(`The second album's marketing budget: ${secondBudget}`);

        // Makes sure the second album's budget is large enough
        if (secondBudget < transferamount)="" {="" throw="" new="" error(="" `the="" second="" album's="" budget="" (${secondbudget})="" is="" less="" than="" the="" transfer="" amount="" (${transferamount}).`="" );="" }="" }),="" reads="" the="" first="" album's="" budget="" transaction.read('albums',="" querytwo).then(results=""> {
        // Gets first album's budget
        const rows = results[0].map(row => row.toJSON());
        firstBudget = rows[0].MarketingBudget;
        console.log(`The first album's marketing budget: ${firstBudget}`);
      }),
    ])
      .then(() => {
        console.log(firstBudget, secondBudget);
        // Transfers the budgets between the albums
        firstBudget += transferAmount;
        secondBudget -= transferAmount;

        console.log(firstBudget, secondBudget);

        // Updates the database
        // Note: Cloud Spanner interprets Node.js numbers as FLOAT64s, so they
        // must be converted (back) to strings before being inserted as INT64s.
        transaction.update('Albums', [
          {
            SingerId: '1',
            AlbumId: '1',
            MarketingBudget: firstBudget.toString(),
          },
          {
            SingerId: '2',
            AlbumId: '2',
            MarketingBudget: secondBudget.toString(),
          },
        ]);
      })
      .then(() => {
        // Commits the transaction and send the changes to the database
        return transaction.commit();
      })
      .then(() => {
        console.log(
          `Successfully executed read-write transaction to transfer ${transferAmount} from Album 2 to Album 1.`
        );
      })
      .catch(err => {
        console.error('ERROR:', err);
      })
      .then(() => {
        transaction.end();
        // Closes the database when finished
        return database.close();
      });
  });

runTransaction(options, runFn)

runTransaction(options: RunTransactionOptions, runFn: RunTransactionCallback): void;

Parameters
Name	Description
`options`	`RunTransactionOptions`
`runFn`	`RunTransactionCallback`

Returns
Type	Description
`void`

runTransactionAsync(runFn)

runTransactionAsync<T = {}>(runFn: AsyncRunTransactionCallback<T>): Promise<T>;

Parameter
Name	Description
`runFn`	`AsyncRunTransactionCallback<T>`

Returns
Type	Description
`Promise<T>`

Type Parameter
Name	Description
`T`

runTransactionAsync(options, runFn)

runTransactionAsync<T = {}>(options: RunTransactionOptions, runFn: AsyncRunTransactionCallback<T>): Promise<T>;

Parameters
Name	Description
`options`	`RunTransactionOptions`
`runFn`	`AsyncRunTransactionCallback<T>`

Returns
Type	Description
`Promise<T>`

Type Parameter
Name	Description
`T`

session(name)

session(name?: string): Session;

Create a Session object.

It is unlikely you will need to interact with sessions directly. By default, sessions are created and utilized for maximum performance automatically.

Parameter
Name	Description
`name`	`string` The name of the session. If not provided, it is assumed you are going to create it.

Returns
Type	Description
`Session`	{Session} A Session object.

Example


var session = database.session('session-name');

setIamPolicy(policy)

setIamPolicy(policy: SetIamPolicyRequest): Promise<SetIamPolicyResponse>;

Sets the policy for the database.

Parameter
Name	Description
`policy`	`SetIamPolicyRequest` requestedPolicyVersion and gax options(configuration options) See https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html for more details on gax options.

Returns
Type	Description
`Promise<SetIamPolicyResponse>`	{Promise<Policy \| undefined>} When resolved, contains the current policy of the database.

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();
const instance = spanner.instance('my-instance');
const database = instance.database('my-database');
const binding = {
    role: 'roles/spanner.fineGrainedAccessUser',
    members: ['user:asthamohta@google.com'],
    condition: {
        title: 'new condition',
        expression: 'resource.name.endsWith("/databaseRoles/parent")',
    },
};
const policy = {
    bindings: [newBinding],
    version: 3,
};
const policy = await database.setIamPolicy({policy: policy});

setIamPolicy(policy, options)

setIamPolicy(policy: SetIamPolicyRequest, options?: CallOptions): Promise<SetIamPolicyResponse>;

Parameters
Name	Description
`policy`	`SetIamPolicyRequest`
`options`	`CallOptions`

Returns
Type	Description
`Promise<SetIamPolicyResponse>`

setIamPolicy(policy, callback)

setIamPolicy(policy: SetIamPolicyRequest, callback: SetIamPolicyCallback): void;

Parameters
Name	Description
`policy`	`SetIamPolicyRequest`
`callback`	`SetIamPolicyCallback`

Returns
Type	Description
`void`

setIamPolicy(policy, options, callback)

setIamPolicy(policy: SetIamPolicyRequest, options: CallOptions, callback: SetIamPolicyCallback): void;

Parameters
Name	Description
`policy`	`SetIamPolicyRequest`
`options`	`CallOptions`
`callback`	`SetIamPolicyCallback`

Returns
Type	Description
`void`

setMetadata(metadata, gaxOptions)

setMetadata(metadata: IDatabase, gaxOptions?: CallOptions): Promise<SetDatabaseMetadataResponse>;

Update the metadata for this database. Note that this method follows PATCH semantics, so previously-configured settings will persist.

Wrapper around .

Parameters
Name	Description
`metadata`	`IDatabase` The metadata you wish to set.
`gaxOptions`	`CallOptions` Request configuration options, See CallOptions for more details.

Returns

Type Description

Promise<SetDatabaseMetadataResponse>

{Promise

Example


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

const metadata = {
  enableDropProtection: true
};

database.setMetadata(metadata, function(err, operation, apiResponse) {
  if (err) {
    // Error handling omitted.
  }

  operation
    .on('error', function(err) {})
    .on('complete', function() {
      // Metadata updated successfully.
    });
});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.setMetadata(metadata).then(function(data) {
  const operation = data[0];
  const apiResponse = data[1];
});

setMetadata(metadata, callback)

setMetadata(metadata: IDatabase, callback: SetDatabaseMetadataCallback): void;

Parameters
Name	Description
`metadata`	`IDatabase`
`callback`	`SetDatabaseMetadataCallback`

Returns
Type	Description
`void`

setMetadata(metadata, gaxOptions, callback)

setMetadata(metadata: IDatabase, gaxOptions: CallOptions, callback: SetDatabaseMetadataCallback): void;

Parameters
Name	Description
`metadata`	`IDatabase`
`gaxOptions`	`CallOptions`
`callback`	`SetDatabaseMetadataCallback`

Returns
Type	Description
`void`

table(name)

table(name: string): Table;

Parameter
Name	Description
`name`	`string`

Returns
Type	Description
`Table`

updateSchema(statements, gaxOptions)

updateSchema(statements: Schema, gaxOptions?: CallOptions): Promise<UpdateSchemaResponse>;

Update the schema of the database by creating/altering/dropping tables, columns, indexes, etc.

This method immediately responds with an Operation object. Register event handlers for the "error" and "complete" events to see how the operation finishes. Follow along with the examples below.

Wrapper around .

Parameters
Name	Description
`statements`	`Schema` An array of database DDL statements, or an [`UpdateDatabaseDdlRequest` object](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.admin.database.v1#google.spanner.admin.database.v1.UpdateDatabaseDdlRequest).
`gaxOptions`	`CallOptions` Request configuration options, See CallOptions for more details.

Returns

Type Description

Promise<UpdateSchemaResponse>

{Promise

Examples


const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner();

const instance = spanner.instance('my-instance');
const database = instance.database('my-database');

const statements = [
  'CREATE TABLE Singers (' +
  '  SingerId INT64 NOT NULL,' +
  '  FirstName STRING(1024),' +
  '  LastName STRING(1024),' +
  '  SingerInfo BYTES(MAX),' +
  ') PRIMARY KEY(SingerId)'
];

database.updateSchema(statements, function(err, operation, apiResponse) {
  if (err) {
    // Error handling omitted.
  }

  operation
    .on('error', function(err) {})
    .on('complete', function() {
      // Database schema updated successfully.
    });
});

//-
// If the callback is omitted, we'll return a Promise.
//-
database.updateSchema(statements)
  .then(function(data) {
    const operation = data[0];
    return operation.promise();
  })
  .then(function() {
    // Database schema updated successfully.
  });

Adding a column:



  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const projectId = 'my-project-id';
  // const instanceId = 'my-instance';
  // const databaseId = 'my-database';

  // Imports the Google Cloud client library
  const {Spanner} = require('@google-cloud/spanner');

  // creates a client
  const spanner = new Spanner({
    projectId: projectId,
  });

  const databaseAdminClient = spanner.getDatabaseAdminClient();

  // Creates a new index in the database
  try {
    const [operation] = await databaseAdminClient.updateDatabaseDdl({
      database: databaseAdminClient.databasePath(
        projectId,
        instanceId,
        databaseId
      ),
      statements: ['ALTER TABLE Albums ADD COLUMN MarketingBudget INT64'],
    });

    console.log('Waiting for operation to complete...');
    await operation.promise();

    console.log('Added the MarketingBudget column.');
  } catch (err) {
    console.error('ERROR:', err);
  } finally {
    // Close the spanner client when finished.
    // The databaseAdminClient does not require explicit closure. The closure of the Spanner client will automatically close the databaseAdminClient.
    spanner.close();
  }

Creating an index:


  // Imports the Google Cloud client library
  const {Spanner} = require('@google-cloud/spanner');

  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const projectId = 'my-project-id';
  // const instanceId = 'my-instance';
  // const databaseId = 'my-database';

  // Creates a client
  const spanner = new Spanner({
    projectId: projectId,
  });

  // Gets a reference to a Cloud Spanner instance and database
  const instance = spanner.instance(instanceId);
  const database = instance.database(databaseId);

  const request = ['CREATE INDEX AlbumsByAlbumTitle ON Albums(AlbumTitle)'];

  // Creates a new index in the database
  try {
    const [operation] = await database.updateSchema(request);

    console.log('Waiting for operation to complete...');
    await operation.promise();

    console.log('Added the AlbumsByAlbumTitle index.');
  } catch (err) {
    console.error('ERROR:', err);
  } finally {
    // Close the database when finished.
    database.close();
  }

Creating a storing index:


  // "Storing" indexes store copies of the columns they index
  // This speeds up queries, but takes more space compared to normal indexes
  // See the link below for more information:
  // https://cloud.google.com/spanner/docs/secondary-indexes#storing_clause

  // Imports the Google Cloud client library
  const {Spanner} = require('@google-cloud/spanner');

  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const projectId = 'my-project-id';
  // const instanceId = 'my-instance';
  // const databaseId = 'my-database';

  // Creates a client
  const spanner = new Spanner({
    projectId: projectId,
  });

  // Gets a reference to a Cloud Spanner instance and database
  const instance = spanner.instance(instanceId);
  const database = instance.database(databaseId);

  const request = [
    'CREATE INDEX AlbumsByAlbumTitle2 ON Albums(AlbumTitle) STORING (MarketingBudget)',
  ];

  // Creates a new index in the database
  try {
    const [operation] = await database.updateSchema(request);

    console.log('Waiting for operation to complete...');
    await operation.promise();

    console.log('Added the AlbumsByAlbumTitle2 index.');
  } catch (err) {
    console.error('ERROR:', err);
  } finally {
    // Close the database when finished.
    database.close();
  }

updateSchema(statements, callback)

updateSchema(statements: Schema, callback: UpdateSchemaCallback): void;

Parameters
Name	Description
`statements`	`Schema`
`callback`	`UpdateSchemaCallback`

Returns
Type	Description
`void`

updateSchema(statements, gaxOptions, callback)

updateSchema(statements: Schema, gaxOptions: CallOptions, callback: UpdateSchemaCallback): void;

Parameters
Name	Description
`statements`	`Schema`
`gaxOptions`	`CallOptions`
`callback`	`UpdateSchemaCallback`

Returns
Type	Description
`void`