Getting started with Spanner in Node.js

/**
 * 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();

const createSingersTableStatement = `
CREATE TABLE Singers (
  SingerId    INT64 NOT NULL,
  FirstName   STRING(1024),
  LastName    STRING(1024),
  SingerInfo  BYTES(MAX),
  FullName    STRING(2048) AS (ARRAY_TO_STRING([FirstName, LastName], " ")) STORED,
) PRIMARY KEY (SingerId)`;
const createAlbumsTableStatement = `
CREATE TABLE Albums (
  SingerId    INT64 NOT NULL,
  AlbumId     INT64 NOT NULL,
  AlbumTitle  STRING(MAX)
) PRIMARY KEY (SingerId, AlbumId),
INTERLEAVE IN PARENT Singers ON DELETE CASCADE`;

// Creates a new database
try {
  const [operation] = await databaseAdminClient.createDatabase({
    createStatement: 'CREATE DATABASE `' + databaseID + '`',
    extraStatements: [
      createSingersTableStatement,
      createAlbumsTableStatement,
    ],
    parent: databaseAdminClient.instancePath(projectID, instanceID),
  });

  console.log(`Waiting for creation of ${databaseID} to complete...`);
  await operation.promise();

  console.log(`Created database ${databaseID} on instance ${instanceID}.`);
} catch (err) {
  console.error('ERROR:', err);
}

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

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

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

const databaseAdminClient = spanner.getDatabaseAdminClient();

async function createPgDatabase() {
  // Creates a PostgreSQL database. PostgreSQL create requests may not contain any additional
  // DDL statements. We need to execute these separately after the database has been created.
  const [operationCreate] = await databaseAdminClient.createDatabase({
    createStatement: 'CREATE DATABASE "' + databaseId + '"',
    parent: databaseAdminClient.instancePath(projectId, instanceId),
    databaseDialect:
      protos.google.spanner.admin.database.v1.DatabaseDialect.POSTGRESQL,
  });

  console.log(`Waiting for operation on ${databaseId} to complete...`);
  await operationCreate.promise();
  const [metadata] = await databaseAdminClient.getDatabase({
    name: databaseAdminClient.databasePath(projectId, instanceId, databaseId),
  });
  console.log(
    `Created database ${databaseId} on instance ${instanceId} with dialect ${metadata.databaseDialect}.`,
  );

  // Create a couple of tables using a separate request. We must use PostgreSQL style DDL as the
  // database has been created with the PostgreSQL dialect.
  const statements = [
    `CREATE TABLE Singers 
      (SingerId   bigint NOT NULL,
      FirstName   varchar(1024),
      LastName    varchar(1024),
      SingerInfo  bytea,
      FullName    character varying(2048) GENERATED ALWAYS AS (FirstName || ' ' || LastName) STORED,
      PRIMARY KEY (SingerId)
      );
      CREATE TABLE Albums 
      (AlbumId    bigint NOT NULL,
      SingerId    bigint NOT NULL REFERENCES Singers (SingerId),
      AlbumTitle  text,
      PRIMARY KEY (AlbumId)
      );`,
  ];
  const [operationUpdateDDL] = await databaseAdminClient.updateDatabaseDdl({
    database: databaseAdminClient.databasePath(
      projectId,
      instanceId,
      databaseId,
    ),
    statements: [statements],
  });
  await operationUpdateDDL.promise();
  console.log('Updated schema');
}
createPgDatabase();