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writeConditionally.js
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// Copyright 2019 Google LLC
//
// 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';
// sample-metadata:
// title: Write Conditionally
// usage: node writeConditionally.js <instanceId> <tableId>
function main(instanceId = 'YOUR_INSTANCE_ID', tableId = 'YOUR_TABLE_ID') {
// [START bigtable_writes_conditional]
/**
* TODO(developer): Uncomment these variables before running the sample.
*/
// const instanceId = 'YOUR_INSTANCE_ID';
// const tableId = 'YOUR_TABLE_ID';
const {Bigtable} = require('@google-cloud/bigtable');
const bigtable = new Bigtable();
async function writeConditionally() {
const instance = bigtable.instance(instanceId);
const table = instance.table(tableId);
const timestamp = new Date();
const row = table.row('phone#4c410523#20190501');
const filter = [
{
column: 'os_build',
value: {
start: 'PQ2A',
end: 'PQ2A',
},
},
];
const config = {
onMatch: [
{
method: 'insert',
data: {
stats_summary: {
os_name: 'android',
timestamp,
},
},
},
],
};
await row.filter(filter, config);
console.log("Successfully updated row's os_name");
}
writeConditionally();
// [END bigtable_writes_conditional]
}
main(...process.argv.slice(2));