chore: sample for snapshot isolation #2265
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There was a problem hiding this comment. Let's rename this to repeatable-read.js. |
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| Original file line number | Diff line number | Diff line change | ||||||
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| @@ -0,0 +1,93 @@ | ||||||||
| // Copyright 2025 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. | ||||||||
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| // sample-metadata: | ||||||||
| // title: Performs a read-write transaction with isolation level option | ||||||||
| // usage: node snapshot-isolation.js <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID> | ||||||||
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| 'use strict'; | ||||||||
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| function main( | ||||||||
| instanceId = 'my-instance', | ||||||||
| databaseId = 'my-database', | ||||||||
| projectId = 'my-project-id' | ||||||||
| ) { | ||||||||
| // [START spanner_isolation_level] | ||||||||
| // Imports the Google Cloud Spanner client library | ||||||||
| const {Spanner, protos} = require('@google-cloud/spanner'); | ||||||||
| const snapshotIsolationOptionsForClient = { | ||||||||
|
There was a problem hiding this comment. probably calls this |
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| defaultTransactionOptions: { | ||||||||
| isolationLevel: | ||||||||
| protos.google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE, | ||||||||
| }, | ||||||||
| }; | ||||||||
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| // Instantiates a client with defaultTransactionOptions | ||||||||
| const spanner = new Spanner({ | ||||||||
| projectId: projectId, | ||||||||
| defaultTransactionOptions: snapshotIsolationOptionsForClient, | ||||||||
| }); | ||||||||
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| function spannerSnapshotIsolation() { | ||||||||
|
There was a problem hiding this comment. I would call this |
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| // Gets a reference to a Cloud Spanner instance and database | ||||||||
| const instance = spanner.instance(instanceId); | ||||||||
| const database = instance.database(databaseId); | ||||||||
| // The isolation level specified at the request level takes precedence over the isolation level configured at the client level. | ||||||||
| const snapshotIsolationOptionsForRequest = { | ||||||||
|
There was a problem hiding this comment.
Suggested change
There was a problem hiding this comment. Same here with naming, something like |
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| isolationLevel: | ||||||||
| protos.google.spanner.v1.TransactionOptions.IsolationLevel | ||||||||
| .REPEATABLE_READ, | ||||||||
| }; | ||||||||
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| database.getTransaction( | ||||||||
| snapshotIsolationOptionsForRequest, | ||||||||
| async (err, transaction) => { | ||||||||
| if (err) { | ||||||||
| console.error(err); | ||||||||
| return; | ||||||||
| } | ||||||||
| try { | ||||||||
| const [rowCount] = await transaction.runUpdate({ | ||||||||
| sql: 'INSERT Singers (SingerId, FirstName, LastName) VALUES (1, @firstName, @lastName)', | ||||||||
| params: { | ||||||||
| firstName: 'Marc', | ||||||||
| lastName: 'Richards', | ||||||||
| }, | ||||||||
| }); | ||||||||
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| console.log( | ||||||||
| `Successfully inserted ${rowCount} record into the Singers table.` | ||||||||
| ); | ||||||||
| await transaction.commit(); | ||||||||
| console.log( | ||||||||
| 'Successfully executed read-write transaction with isolationLevel option.' | ||||||||
| ); | ||||||||
| } catch (err) { | ||||||||
| console.error('ERROR:', err); | ||||||||
| } finally { | ||||||||
| transaction.end(); | ||||||||
| // Close the database when finished. | ||||||||
| await database.close(); | ||||||||
| } | ||||||||
| } | ||||||||
| ); | ||||||||
| } | ||||||||
| spannerSnapshotIsolation(); | ||||||||
| // [END spanner_isolation_level] | ||||||||
| } | ||||||||
| process.on('unhandledRejection', err => { | ||||||||
| console.error(err.message); | ||||||||
| process.exitCode = 1; | ||||||||
| }); | ||||||||
| main(...process.argv.slice(2)); | ||||||||
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Same here with naming: repeatable-read.js
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done