feat: sample - query with named params (#116)

Author: stephaniewang526

samples/src/main/java/com/example/bigquery/LoadParquet.java

@@ -43,7 +43,7 @@ public static void loadParquet(String datasetName) {
 
       String sourceUri = "gs://cloud-samples-data/bigquery/us-states/us-states.parquet";
       TableId tableId = TableId.of(datasetName, "us_states");
-      
+
       LoadJobConfiguration configuration =
           LoadJobConfiguration.builder(tableId, sourceUri)
               .setFormatOptions(FormatOptions.parquet())

samples/src/main/java/com/example/bigquery/QueryWithNamedParameters.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2020 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.bigquery;
+
+// [START bigquery_query_params_named]
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryException;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.QueryJobConfiguration;
+import com.google.cloud.bigquery.QueryParameterValue;
+import com.google.cloud.bigquery.TableResult;
+
+public class QueryWithNamedParameters {
+
+  public static void queryWithNamedParameters() {
+    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();
+
+      String corpus = "romeoandjuliet";
+      long minWordCount = 250;
+      String query =
+          "SELECT word, word_count\n"
+              + "FROM `bigquery-public-data.samples.shakespeare`\n"
+              + "WHERE corpus = @corpus\n"
+              + "AND word_count >= @min_word_count\n"
+              + "ORDER BY word_count DESC";
+
+      // Note: Standard SQL is required to use query parameters.
+      QueryJobConfiguration queryConfig =
+          QueryJobConfiguration.newBuilder(query)
+              .addNamedParameter("corpus", QueryParameterValue.string(corpus))
+              .addNamedParameter("min_word_count", QueryParameterValue.int64(minWordCount))
+              .build();
+
+      TableResult results = bigquery.query(queryConfig);
+
+      results
+          .iterateAll()
+          .forEach(row -> row.forEach(val -> System.out.printf("%s,", val.toString())));
+
+      System.out.println("Query with named parameters performed successfully.");
+    } catch (BigQueryException | InterruptedException e) {
+      System.out.println("Query not performed \n" + e.toString());
+    }
+  }
+}
+// [END bigquery_query_params_named]

samples/src/test/java/com/example/bigquery/QueryWithNamedParametersIT.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2020 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.bigquery;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class QueryWithNamedParametersIT {
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  @Before
+  public void setUp() {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void testQueryWithNamedParameters() {
+    QueryWithNamedParameters.queryWithNamedParameters();
+    assertThat(bout.toString()).contains("Query with named parameters performed successfully.");
+  }
+}