クエリ スクリプトを実行します。
コードサンプル
Java
このサンプルを試す前に、クライアント ライブラリを使用した BigQuery クイックスタートの Java の手順に沿って設定を行ってください。 詳細については、BigQuery Java API のリファレンス ドキュメントをご覧ください。
import com.google.api.gax.paging.Page;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Job;
import com.google.cloud.bigquery.JobInfo;
import com.google.cloud.bigquery.QueryJobConfiguration;
// Sample to run query script.
public class QueryScript {
public static void main(String[] args) {
String script =
"-- Declare a variable to hold names as an array.\n"
+ "DECLARE top_names ARRAY<STRING>;\n"
+ "-- Build an array of the top 100 names from the year 2017.\n"
+ "SET top_names = (\n"
+ " SELECT ARRAY_AGG(name ORDER BY number DESC LIMIT 100)\n"
+ " FROM `bigquery-public-data`.usa_names.usa_1910_current\n"
+ " WHERE year = 2017\n"
+ ");\n"
+ "-- Which names appear as words in Shakespeare's plays?\n"
+ "SELECT\n"
+ " name AS shakespeare_name\n"
+ "FROM UNNEST(top_names) AS name\n"
+ "WHERE name IN (\n"
+ " SELECT word\n"
+ " FROM `bigquery-public-data`.samples.shakespeare\n"
+ ");";
queryScript(script);
}
public static void queryScript(String script) {
try {
// Initialize client that will be used to send requests. This client only needs to be created
// once, and can be reused for multiple requests.
BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();
QueryJobConfiguration queryConfig = QueryJobConfiguration.newBuilder(script).build();
Job createJob = bigquery.create(JobInfo.of(queryConfig));
// Wait for the whole script to finish.
JobInfo jobInfo = createJob.waitFor();
String parentJobId = jobInfo.getJobId().getJob();
// Fetch jobs created by the SQL script.
Page<Job> childJobs = bigquery.listJobs(BigQuery.JobListOption.parentJobId(parentJobId));
childJobs
.iterateAll()
.forEach(job -> System.out.printf("Child Job Id: ", job.getJobId().getJob()));
System.out.println("Query script performed successfully.");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Query not performed \n" + e.toString());
}
}
}
Python
このサンプルを試す前に、クライアント ライブラリを使用した BigQuery クイックスタートの Python の手順に沿って設定を行ってください。詳細については、BigQuery Python API のリファレンス ドキュメントをご覧ください。
from google.cloud import bigquery
# Construct a BigQuery client object.
client = bigquery.Client()
# Run a SQL script.
sql_script = """
-- Declare a variable to hold names as an array.
DECLARE top_names ARRAY<STRING>;
-- Build an array of the top 100 names from the year 2017.
SET top_names = (
SELECT ARRAY_AGG(name ORDER BY number DESC LIMIT 100)
FROM `bigquery-public-data.usa_names.usa_1910_2013`
WHERE year = 2000
);
-- Which names appear as words in Shakespeare's plays?
SELECT
name AS shakespeare_name
FROM UNNEST(top_names) AS name
WHERE name IN (
SELECT word
FROM `bigquery-public-data.samples.shakespeare`
);
"""
parent_job = client.query(sql_script)
# Wait for the whole script to finish.
rows_iterable = parent_job.result()
print("Script created {} child jobs.".format(parent_job.num_child_jobs))
# Fetch result rows for the final sub-job in the script.
rows = list(rows_iterable)
print(
"{} of the top 100 names from year 2000 also appear in Shakespeare's works.".format(
len(rows)
)
)
# Fetch jobs created by the SQL script.
child_jobs_iterable = client.list_jobs(parent_job=parent_job)
for child_job in child_jobs_iterable:
child_rows = list(child_job.result())
print(
"Child job with ID {} produced {} row(s).".format(
child_job.job_id, len(child_rows)
)
)
次のステップ
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