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crud.js
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crud.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 updateData(instanceId, databaseId, projectId) {
// [START spanner_update_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);
// Update a row in the Albums table
// Note: Cloud Spanner interprets Node.js numbers as FLOAT64s, so they
// must be converted to strings before being inserted as INT64s
const albumsTable = database.table('Albums');
albumsTable
.update([
{SingerId: '1', AlbumId: '1', MarketingBudget: '100000'},
{SingerId: '2', AlbumId: '2', MarketingBudget: '500000'},
])
.then(() => {
console.log('Updated data.');
})
.catch(err => {
console.error('ERROR:', err);
})
.then(() => {
// Close the database when finished.
return database.close();
});
// [END spanner_update_data]
}
function insertData(instanceId, databaseId, projectId) {
// [START spanner_insert_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);
// Instantiate Spanner table objects
const singersTable = database.table('Singers');
const albumsTable = database.table('Albums');
// Inserts rows into the Singers table
// Note: Cloud Spanner interprets Node.js numbers as FLOAT64s, so
// they must be converted to strings before being inserted as INT64s
singersTable
.insert([
{SingerId: '1', FirstName: 'Marc', LastName: 'Richards'},
{SingerId: '2', FirstName: 'Catalina', LastName: 'Smith'},
{SingerId: '3', FirstName: 'Alice', LastName: 'Trentor'},
{SingerId: '4', FirstName: 'Lea', LastName: 'Martin'},
{SingerId: '5', FirstName: 'David', LastName: 'Lomond'},
])
.then(() => {
// Inserts rows into the Albums table
return albumsTable.insert([
{SingerId: '1', AlbumId: '1', AlbumTitle: 'Total Junk'},
{SingerId: '1', AlbumId: '2', AlbumTitle: 'Go, Go, Go'},
{SingerId: '2', AlbumId: '1', AlbumTitle: 'Green'},
{SingerId: '2', AlbumId: '2', AlbumTitle: 'Forever Hold your Peace'},
{SingerId: '2', AlbumId: '3', AlbumTitle: 'Terrified'},
]);
})
.then(() => {
console.log('Inserted data.');
})
.catch(err => {
console.error('ERROR:', err);
})
.then(() => {
// Close the database when finished.
return database.close();
});
// [END spanner_insert_data]
}
function queryData(instanceId, databaseId, projectId) {
// [START spanner_query_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);
const query = {
sql: 'SELECT SingerId, AlbumId, AlbumTitle 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}, AlbumTitle: ${
json.AlbumTitle
}`
);
});
})
.catch(err => {
console.error('ERROR:', err);
})
.then(() => {
// Close the database when finished.
return database.close();
});
// [END spanner_query_data]
}
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,
},
};
albumsTable
.read(query)
.then(results => {
const rows = results[0];
rows.forEach(row => {
const json = row.toJSON();
console.log(
`SingerId: ${json.SingerId}, AlbumId: ${json.AlbumId}, AlbumTitle: ${
json.AlbumTitle
}`
);
});
})
.catch(err => {
console.error('ERROR:', err);
})
.then(() => {
// Close the database when finished.
return database.close();
});
// [END spanner_read_data]
}
function readStaleData(instanceId, databaseId, projectId) {
// [START spanner_read_stale_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', 'MarketingBudget'],
keySet: {
all: true,
},
};
const options = {
// Guarantees that all writes committed more than 15 seconds ago are visible
exactStaleness: 15,
};
albumsTable
.read(query, options)
.then(results => {
const rows = results[0];
rows.forEach(row => {
const json = row.toJSON();
const id = json.SingerId;
const album = json.AlbumId;
const title = json.AlbumTitle;
const budget = json.MarketingBudget ? json.MarketingBudget : '';
console.log(
`SingerId: ${id}, AlbumId: ${album}, AlbumTitle: ${title}, MarketingBudget: ${budget}`
);
});
})
.catch(err => {
console.error('ERROR:', err);
})
.then(() => {
// Close the database when finished.
return database.close();
});
// [END spanner_read_stale_data]
}
require(`yargs`)
.demand(1)
.command(
`update <instanceName> <databaseName> <projectId>`,
`Modifies existing rows of data in an example Cloud Spanner table.`,
{},
opts => updateData(opts.instanceName, opts.databaseName, opts.projectId)
)
.command(
`query <instanceName> <databaseName> <projectId>`,
`Executes a read-only SQL query against an example Cloud Spanner table.`,
{},
opts => queryData(opts.instanceName, opts.databaseName, opts.projectId)
)
.command(
`insert <instanceName> <databaseName> <projectId>`,
`Inserts new rows of data into an example Cloud Spanner table.`,
{},
opts => insertData(opts.instanceName, opts.databaseName, opts.projectId)
)
.command(
`read <instanceName> <databaseName> <projectId>`,
`Reads data in an example Cloud Spanner table.`,
{},
opts => readData(opts.instanceName, opts.databaseName, opts.projectId)
)
.command(
`read-stale <instanceName> <databaseName> <projectId>`,
`Reads stale data in an example Cloud Spanner table.`,
{},
opts => readStaleData(opts.instanceName, opts.databaseName, opts.projectId)
)
.example(`node $0 update "my-instance" "my-database" "my-project-id"`)
.example(`node $0 query "my-instance" "my-database" "my-project-id"`)
.example(`node $0 insert "my-instance" "my-database" "my-project-id"`)
.example(`node $0 read "my-instance" "my-database" "my-project-id"`)
.example(`node $0 read-stale "my-instance" "my-database" "my-project-id"`)
.wrap(120)
.recommendCommands()
.epilogue(`For more information, see https://cloud.google.com/spanner/docs`)
.strict()
.help().argv;