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PgCreateSequenceSample.java
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PgCreateSequenceSample.java
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/*
* Copyright 2023 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.
*/
package com.example.spanner.admin.archived;
// [START spanner_postgresql_create_sequence]
import com.google.cloud.spanner.DatabaseAdminClient;
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.ResultSet;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerExceptionFactory;
import com.google.cloud.spanner.SpannerOptions;
import com.google.cloud.spanner.Statement;
import com.google.common.collect.ImmutableList;
import java.util.Objects;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
public class PgCreateSequenceSample {
static void pgCreateSequence() {
// TODO(developer): Replace these variables before running the sample.
final String projectId = "my-project";
final String instanceId = "my-instance";
final String databaseId = "my-database";
pgCreateSequence(projectId, instanceId, databaseId);
}
static void pgCreateSequence(String projectId, String instanceId, String databaseId) {
try (Spanner spanner =
SpannerOptions.newBuilder().setProjectId(projectId).build().getService()) {
final DatabaseAdminClient dbAdminClient = spanner.getDatabaseAdminClient();
dbAdminClient
.updateDatabaseDdl(
instanceId,
databaseId,
ImmutableList.of(
"CREATE SEQUENCE Seq BIT_REVERSED_POSITIVE;",
"CREATE TABLE Customers (CustomerId BIGINT DEFAULT nextval('Seq'), "
+ "CustomerName character varying(1024), PRIMARY KEY (CustomerId))"),
null)
.get(5, TimeUnit.MINUTES);
System.out.println(
"Created Seq sequence and Customers table, where its key column "
+ "CustomerId uses the sequence as a default value");
final DatabaseClient dbClient =
spanner.getDatabaseClient(DatabaseId.of(projectId, instanceId, databaseId));
Long insertCount =
dbClient
.readWriteTransaction()
.run(
transaction -> {
try (ResultSet rs =
transaction.executeQuery(
Statement.of(
"INSERT INTO Customers (CustomerName) VALUES "
+ "('Alice'), ('David'), ('Marc') RETURNING CustomerId"))) {
while (rs.next()) {
System.out.printf(
"Inserted customer record with CustomerId: %d\n", rs.getLong(0));
}
return Objects.requireNonNull(rs.getStats()).getRowCountExact();
}
});
System.out.printf("Number of customer records inserted is: %d\n", insertCount);
} catch (ExecutionException e) {
// If the operation failed during execution, expose the cause.
throw SpannerExceptionFactory.asSpannerException(e.getCause());
} catch (InterruptedException e) {
// Throw when a thread is waiting, sleeping, or otherwise occupied,
// and the thread is interrupted, either before or during the activity.
throw SpannerExceptionFactory.propagateInterrupt(e);
} catch (TimeoutException e) {
// If the operation timed out propagate the timeout
throw SpannerExceptionFactory.propagateTimeout(e);
}
}
}
// [END spanner_postgresql_create_sequence]