Function readData

spanner/crud.js:231–278

(instanceId, databaseId, projectId)

}

async function readData(instanceId, databaseId, projectId) {
  // [START spanner_read_data]
  // 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);

  // Reads rows from the Albums table
  const albumsTable = database.table('Albums');

  const query = {
    columns: ['SingerId', 'AlbumId', 'AlbumTitle'],
    keySet: {
      all: true,
    },
  };

  try {
    const [rows] = await albumsTable.read(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();
  }
  // [END spanner_read_data]
}

async function readStaleData(instanceId, databaseId, projectId) {
  // [START spanner_read_stale_data]