/
schema.js
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/
schema.js
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/**
* Copyright 2017, Google, Inc.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
function createDatabase(instanceId, databaseId, projectId) {
// [START create_database]
// 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
const instance = spanner.instance(instanceId);
// Note: Cloud Spanner interprets Node.js numbers as FLOAT64s, so they
// must be converted to strings before being inserted as INT64s
const request = {
schema: [
`CREATE TABLE Singers (
SingerId INT64 NOT NULL,
FirstName STRING(1024),
LastName STRING(1024),
SingerInfo BYTES(MAX)
) PRIMARY KEY (SingerId)`,
`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 database
instance
.createDatabase(databaseId, request)
.then(results => {
const database = results[0];
const operation = results[1];
console.log(`Waiting for operation on ${database.id} to complete...`);
return operation.promise();
})
.then(() => {
console.log(`Created database ${databaseId} on instance ${instanceId}.`);
})
.catch(err => {
console.error('ERROR:', err);
});
// [END create_database]
}
function addColumn(instanceId, databaseId, projectId) {
// [START add_column]
// 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 = ['ALTER TABLE Albums ADD COLUMN MarketingBudget INT64'];
// Creates a new index in the database
database
.updateSchema(request)
.then(results => {
const operation = results[0];
console.log('Waiting for operation to complete...');
return operation.promise();
})
.then(() => {
console.log('Added the MarketingBudget column.');
})
.catch(err => {
console.error('ERROR:', err);
})
.then(() => {
// Close the database when finished.
return database.close();
});
// [END add_column]
}
function queryDataWithNewColumn(instanceId, databaseId, projectId) {
// [START query_data_with_new_column]
// This sample uses the `MarketingBudget` column. You can add the column
// by running the `add_column` sample or by running this DDL statement against
// your database:
// ALTER TABLE Albums ADD COLUMN MarketingBudget INT64
// 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, MarketingBudget FROM Albums`,
};
// Queries rows from the Albums table
database
.run(query)
.then(results => {
const rows = results[0];
rows.forEach(row => {
const json = row.toJSON();
console.log(
`SingerId: ${json.SingerId}, AlbumId: ${
json.AlbumId
}, MarketingBudget: ${
json.MarketingBudget ? json.MarketingBudget : null
}`
);
});
})
.catch(err => {
console.error('ERROR:', err);
})
.then(() => {
// Close the database when finished.
return database.close();
});
// [END query_data_with_new_column]
}
require(`yargs`)
.demand(1)
.command(
`createDatabase <instanceName> <databaseName> <projectId>`,
`Creates an example database with two tables in a Cloud Spanner instance.`,
{},
opts => createDatabase(opts.instanceName, opts.databaseName, opts.projectId)
)
.command(
`addColumn <instanceName> <databaseName> <projectId>`,
`Adds an example MarketingBudget column to an example Cloud Spanner table.`,
{},
opts => addColumn(opts.instanceName, opts.databaseName, opts.projectId)
)
.command(
`queryNewColumn <instanceName> <databaseName> <projectId>`,
`Executes a read-only SQL query against an example Cloud Spanner table with an additional column (MarketingBudget) added by addColumn.`,
{},
opts =>
queryDataWithNewColumn(
opts.instanceName,
opts.databaseName,
opts.projectId
)
)
.example(`node $0 createDatabase "my-instance" "my-database" "my-project-id"`)
.example(`node $0 addColumn "my-instance" "my-database" "my-project-id"`)
.example(`node $0 queryNewColumn "my-instance" "my-database" "my-project-id"`)
.wrap(120)
.recommendCommands()
.epilogue(`For more information, see https://cloud.google.com/spanner/docs`)
.strict()
.help().argv;