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AsyncDmlExample.java
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AsyncDmlExample.java
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/*
* Copyright 2020 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.
*/
package com.example.spanner;
// [START spanner_async_dml_standard_insert]
import com.google.api.core.ApiFuture;
import com.google.cloud.spanner.AsyncRunner;
import com.google.cloud.spanner.AsyncRunner.AsyncWork;
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerOptions;
import com.google.cloud.spanner.Statement;
import com.google.cloud.spanner.TransactionContext;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeoutException;
class AsyncDmlExample {
static void asyncDml() throws InterruptedException, ExecutionException, TimeoutException {
// TODO(developer): Replace these variables before running the sample.
String projectId = "my-project";
String instanceId = "my-instance";
String databaseId = "my-database";
try (Spanner spanner =
SpannerOptions.newBuilder().setProjectId(projectId).build().getService()) {
DatabaseClient client =
spanner.getDatabaseClient(DatabaseId.of(projectId, instanceId, databaseId));
asyncDml(client);
}
}
// Execute a DML statement asynchronously.
static void asyncDml(DatabaseClient client)
throws InterruptedException, ExecutionException, TimeoutException {
ExecutorService executor = Executors.newSingleThreadExecutor();
AsyncRunner runner = client.runAsync();
ApiFuture<Long> rowCount =
runner.runAsync(
txn -> {
String sql =
"INSERT INTO Singers (SingerId, FirstName, LastName) VALUES "
+ "(12, 'Melissa', 'Garcia'), "
+ "(13, 'Russell', 'Morales'), "
+ "(14, 'Jacqueline', 'Long'), "
+ "(15, 'Dylan', 'Shaw')";
return txn.executeUpdateAsync(Statement.of(sql));
},
executor);
System.out.printf("%d records inserted.%n", rowCount.get());
executor.shutdown();
}
}
//[END spanner_async_dml_standard_insert]