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Java idiomatic client for Google Cloud BigQuery.
/*
* Copyright 2021 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.google.cloud.bigquery;
import com.google.api.core.BetaApi;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.List;
import java.util.Map;
/**
* A Connection is a session between a Java application and BigQuery. SQL statements are executed
* and results are returned within the context of a connection.
*/
public interface Connection {
/** Sends a query cancel request. This call will return immediately */
@BetaApi
boolean close() throws BigQuerySQLException;
/**
* Execute a query dry run that returns information on the schema and query parameters of the
* query results.
*
* @param sql typically a static SQL SELECT statement
* @exception BigQuerySQLException if a database access error occurs
*/
@BetaApi
BigQueryDryRunResult dryRun(String sql) throws BigQuerySQLException;
/**
* Execute a SQL statement that returns a single ResultSet.
*
* Example of running a query.
*
*
* {
* @code
* ConnectionSettings connectionSettings =
* ConnectionSettings.newBuilder()
* .setRequestTimeout(10L)
* .setMaxResults(100L)
* .setUseQueryCache(true)
* .build();
* Connection connection = bigquery.createConnection(connectionSettings);
* String selectQuery = "SELECT corpus FROM `bigquery-public-data.samples.shakespeare` GROUP BY corpus;";
* BigQueryResult bqResultSet = connection.executeSelect(selectQuery)
* ResultSet rs = bqResultSet.getResultSet();
* while (rs.next()) {
* System.out.printf("%s,", rs.getString("corpus"));
* }
*
*
* @param sql a static SQL SELECT statement
* @return a ResultSet that contains the data produced by the query
* @exception BigQuerySQLException if a database access error occurs
*/
@BetaApi
BigQueryResult executeSelect(String sql) throws BigQuerySQLException;
/**
* This method executes a SQL SELECT query
*
* @param sql SQL SELECT query
* @param parameters named or positional parameters. The set of query parameters must either be
* all positional or all named parameters.
* @param labels (optional) the labels associated with this query. You can use these to organize
* and group your query jobs. Label keys and values can be no longer than 63 characters, can
* only contain lowercase letters, numeric characters, underscores and dashes. International
* characters are allowed. Label values are optional and Label is a Varargs. You should pass
* all the Labels in a single Map .Label keys must start with a letter and each label in the
* list must have a different key.
* @return BigQueryResult containing the output of the query
* @throws BigQuerySQLException
*/
@BetaApi
BigQueryResult executeSelect(
String sql, List parameters, Map... labels)
throws BigQuerySQLException;
/**
* Execute a SQL statement that returns a single ResultSet and returns a ListenableFuture to
* process the response asynchronously.
*
* Example of running a query.
*
*
* {
* @code
* ConnectionSettings connectionSettings =
* ConnectionSettings.newBuilder()
* .setUseReadAPI(true)
* .build();
* Connection connection = bigquery.createConnection(connectionSettings);
* String selectQuery = "SELECT corpus FROM `bigquery-public-data.samples.shakespeare` GROUP BY corpus;";
* ListenableFuture<ExecuteSelectResponse> executeSelectFuture = connection.executeSelectAsync(selectQuery);
* ExecuteSelectResponse executeSelectRes = executeSelectFuture.get();
*
* if(!executeSelectRes.getIsSuccessful()){
* throw executeSelectRes.getBigQuerySQLException();
* }
*
* BigQueryResult bigQueryResult = executeSelectRes.getBigQueryResult();
* ResultSet rs = bigQueryResult.getResultSet();
* while (rs.next()) {
* System.out.println(rs.getString(1));
* }
*
*
*
* @param sql a static SQL SELECT statement
* @return a ListenableFuture that is used to get the data produced by the query
* @throws BigQuerySQLException upon failure
*/
@BetaApi
ListenableFuture executeSelectAsync(String sql)
throws BigQuerySQLException;
/**
* Execute a SQL statement that returns a single ResultSet and returns a ListenableFuture to
* process the response asynchronously.
*
* Example of running a query.
*
*
* {
* @code
* ConnectionSettings connectionSettings =
* ConnectionSettings.newBuilder()
* ..setUseReadAPI(true)
* .build();
* Connection connection = bigquery.createConnection(connectionSettings);
* String selectQuery =
* "SELECT TimestampField, StringField, BooleanField FROM "
* + MY_TABLE
* + " WHERE StringField = @stringParam"
* + " AND IntegerField IN UNNEST(@integerList)";
* QueryParameterValue stringParameter = QueryParameterValue.string("stringValue");
* QueryParameterValue intArrayParameter =
* QueryParameterValue.array(new Integer[] {3, 4}, Integer.class);
* Parameter stringParam =
* Parameter.newBuilder().setName("stringParam").setValue(stringParameter).build();
* Parameter intArrayParam =
* Parameter.newBuilder().setName("integerList").setValue(intArrayParameter).build();
* List<Parameter> parameters = ImmutableList.of(stringParam, intArrayParam);
*
* ListenableFuture<ExecuteSelectResponse> executeSelectFut =
* connection.executeSelectAsync(selectQuery, parameters);
* ExecuteSelectResponse executeSelectRes = executeSelectFuture.get();
*
* if(!executeSelectRes.getIsSuccessful()){
* throw executeSelectRes.getBigQuerySQLException();
* }
*
* BigQueryResult bigQueryResult = executeSelectRes.getBigQueryResult();
* ResultSet rs = bigQueryResult.getResultSet();
* while (rs.next()) {
* System.out.println(rs.getString(1));
* }
*
*
*
* @param sql SQL SELECT query
* @param parameters named or positional parameters. The set of query parameters must either be
* all positional or all named parameters.
* @param labels (optional) the labels associated with this query. You can use these to organize
* and group your query jobs. Label keys and values can be no longer than 63 characters, can
* only contain lowercase letters, numeric characters, underscores and dashes. International
* characters are allowed. Label values are optional and Label is a Varargs. You should pass
* all the Labels in a single Map .Label keys must start with a letter and each label in the
* list must have a different key.
* @return a ListenableFuture that is used to get the data produced by the query
* @throws BigQuerySQLException upon failure
*/
@BetaApi
ListenableFuture executeSelectAsync(
String sql, List parameters, Map... labels)
throws BigQuerySQLException;
}