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| 1 | +// Copyright 2024 Google LLC |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +// you may not use this file except in compliance with the License. |
| 5 | +// You may obtain a copy of the License at |
| 6 | +// |
| 7 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +// |
| 9 | +// Unless required by applicable law or agreed to in writing, software |
| 10 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +// See the License for the specific language governing permissions and |
| 13 | +// limitations under the License. |
| 14 | + |
| 15 | +'use strict'; |
| 16 | + |
| 17 | +// eslint-disable-next-line node/no-unpublished-require |
| 18 | +const singer = require('./resource/singer.js'); |
| 19 | +const music = singer.examples.spanner.music; |
| 20 | + |
| 21 | +function main( |
| 22 | + instanceId = 'my-instance', |
| 23 | + databaseId = 'my-database', |
| 24 | + projectId = 'my-project-id' |
| 25 | +) { |
| 26 | + // [START spanner_query_with_proto_types_parameter] |
| 27 | + /** |
| 28 | + * TODO(developer): Uncomment these variables before running the sample. |
| 29 | + */ |
| 30 | + // const instanceId = 'my-instance'; |
| 31 | + // const databaseId = 'my-database'; |
| 32 | + // const projectId = 'my-project-id'; |
| 33 | + |
| 34 | + // Imports the Google Cloud Spanner client library |
| 35 | + const {Spanner} = require('@google-cloud/spanner'); |
| 36 | + |
| 37 | + // Instantiates a client |
| 38 | + const spanner = new Spanner({ |
| 39 | + projectId: projectId, |
| 40 | + }); |
| 41 | + |
| 42 | + async function queryDataWithProtoTypes() { |
| 43 | + // Gets a reference to a Cloud Spanner instance and database. |
| 44 | + const instance = spanner.instance(instanceId); |
| 45 | + const database = instance.database(databaseId); |
| 46 | + |
| 47 | + const query = { |
| 48 | + sql: `SELECT SingerId, |
| 49 | + SingerInfo, |
| 50 | + SingerInfo.nationality, |
| 51 | + SingerInfoArray, |
| 52 | + SingerGenre, |
| 53 | + SingerGenreArray |
| 54 | + FROM Singers |
| 55 | + WHERE SingerInfo.nationality = @country |
| 56 | + and SingerGenre=@singerGenre`, |
| 57 | + params: { |
| 58 | + country: 'Country2', |
| 59 | + singerGenre: music.Genre.FOLK, |
| 60 | + }, |
| 61 | + /* `columnsMetadata` is an optional parameter and is used to deserialize the |
| 62 | + proto message and enum object back from bytearray and int respectively. |
| 63 | + If columnsMetadata is not passed for proto messages and enums, then the data |
| 64 | + types for these columns will be bytes and int respectively. */ |
| 65 | + columnsMetadata: { |
| 66 | + SingerInfo: music.SingerInfo, |
| 67 | + SingerInfoArray: music.SingerInfo, |
| 68 | + SingerGenre: music.Genre, |
| 69 | + SingerGenreArray: music.Genre, |
| 70 | + }, |
| 71 | + }; |
| 72 | + |
| 73 | + // Queries rows from the Singers table. |
| 74 | + try { |
| 75 | + const [rows] = await database.run(query); |
| 76 | + |
| 77 | + rows.forEach(row => { |
| 78 | + const json = row.toJSON(); |
| 79 | + console.log( |
| 80 | + `SingerId: ${json.SingerId}, SingerInfo: ${json.SingerInfo}, SingerGenre: ${json.SingerGenre}, |
| 81 | + SingerInfoArray: ${json.SingerInfoArray}, SingerGenreArray: ${json.SingerGenreArray}` |
| 82 | + ); |
| 83 | + }); |
| 84 | + } catch (err) { |
| 85 | + console.error('ERROR:', err); |
| 86 | + } finally { |
| 87 | + // Close the database when finished. |
| 88 | + database.close(); |
| 89 | + } |
| 90 | + } |
| 91 | + |
| 92 | + queryDataWithProtoTypes(); |
| 93 | + // [END spanner_query_with_proto_types_parameter] |
| 94 | +} |
| 95 | + |
| 96 | +process.on('unhandledRejection', err => { |
| 97 | + console.error(err.message); |
| 98 | + process.exitCode = 1; |
| 99 | +}); |
| 100 | +main(...process.argv.slice(2)); |
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