docs: Add specific samples for creating and query timestamps

Author: lqiu96

samples/snippets/src/main/java/com/example/bigquery/CreateTableTimestamp.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2026 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_create_table_timestamp]
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryException;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.Field;
+import com.google.cloud.bigquery.Schema;
+import com.google.cloud.bigquery.StandardSQLTypeName;
+import com.google.cloud.bigquery.StandardTableDefinition;
+import com.google.cloud.bigquery.TableDefinition;
+import com.google.cloud.bigquery.TableId;
+import com.google.cloud.bigquery.TableInfo;
+
+public class CreateTableTimestamp {
+
+  public static void main(String[] args) {
+    // TODO(developer): Replace these variables before running the sample.
+    String datasetName = "MY_DATASET_NAME";
+    String tableName = "MY_TABLE_NAME";
+    Schema schema =
+        Schema.of(Field.newBuilder("timestampField", StandardSQLTypeName.TIMESTAMP).build());
+    createTable(datasetName, tableName, schema);
+  }
+
+  public static void createTable(String datasetName, String tableName, Schema schema) {
+    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();
+
+      TableId tableId = TableId.of(datasetName, tableName);
+      TableDefinition tableDefinition = StandardTableDefinition.of(schema);
+      TableInfo tableInfo = TableInfo.newBuilder(tableId, tableDefinition).build();
+
+      bigquery.create(tableInfo);
+      System.out.println("Table created successfully");
+    } catch (BigQueryException e) {
+      System.out.println("Table was not created. \n" + e);
+    }
+  }
+}
+// [END bigquery_create_table_timestamp]

samples/snippets/src/main/java/com/example/bigquery/QueryWithTimestampParameters.java

@@ -30,8 +30,34 @@
 // Sample to running a query with timestamp query parameters.
 public class QueryWithTimestampParameters {
 
-  public static void main(String[] args) {
-    queryWithTimestampParameters();
+  public static void queryFromTableTimestampParameters() {
+    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();
+
+      ZonedDateTime timestamp = LocalDateTime.of(2016, 12, 7, 8, 0, 0).atZone(ZoneOffset.UTC);
+      String query = "SELECT last_reported FROM bigquery-public-data.new_york_citibike.citibike_stations WHERE last_reported >= @ts_value LIMIT 5";
+      // Note: Standard SQL is required to use query parameters.
+      QueryJobConfiguration queryConfig =
+          QueryJobConfiguration.newBuilder(query)
+              .addNamedParameter(
+                  "ts_value",
+                  QueryParameterValue.timestamp(
+                      // Timestamp takes microseconds since 1970-01-01T00:00:00 UTC
+                      timestamp.toInstant().toEpochMilli() * 1000))
+              .build();
+
+      TableResult results = bigquery.query(queryConfig);
+
+      results
+          .iterateAll()
+          .forEach(row -> row.forEach(val -> System.out.printf("%s\n", val.toString())));
+
+      System.out.println("Query with timestamp parameter performed successfully.");
+    } catch (BigQueryException | InterruptedException e) {
+      System.out.println("Query not performed \n" + e);
+    }
   }
 
   public static void queryWithTimestampParameters() {
@@ -60,7 +86,7 @@ public static void queryWithTimestampParameters() {
 
       System.out.println("Query with timestamp parameter performed successfully.");
     } catch (BigQueryException | InterruptedException e) {
-      System.out.println("Query not performed \n" + e.toString());
+      System.out.println("Query not performed \n" + e);
     }
   }
 }

samples/snippets/src/test/java/com/example/bigquery/CreateTableIT.java

@@ -37,26 +37,25 @@ public class CreateTableIT {
   private final Logger log = Logger.getLogger(this.getClass().getName());
   private String tableName;
   private ByteArrayOutputStream bout;
-  private PrintStream out;
   private PrintStream originalPrintStream;
 
   private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME");
 
-  private static void requireEnvVar(String varName) {
+  private static void requireEnvVar() {
     assertNotNull(
-        "Environment variable " + varName + " is required to perform these tests.",
-        System.getenv(varName));
+        "Environment variable BIGQUERY_DATASET_NAME is required to perform these tests.",
+        System.getenv("BIGQUERY_DATASET_NAME"));
   }
 
   @BeforeClass
   public static void checkRequirements() {
-    requireEnvVar("BIGQUERY_DATASET_NAME");
+    requireEnvVar();
   }
 
   @Before
   public void setUp() {
     bout = new ByteArrayOutputStream();
-    out = new PrintStream(bout);
+    PrintStream out = new PrintStream(bout);
     originalPrintStream = System.out;
     System.setOut(out);
     tableName = "MY_TABLE_NAME_" + UUID.randomUUID().toString().replace("-", "_");

samples/snippets/src/test/java/com/example/bigquery/CreateTableTimestampIT.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2026 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 com.google.cloud.bigquery.Field;
+import com.google.cloud.bigquery.Schema;
+import com.google.cloud.bigquery.StandardSQLTypeName;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.util.UUID;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import static com.google.common.truth.Truth.assertThat;
+import static junit.framework.TestCase.assertNotNull;
+
+public class CreateTableTimestampIT {
+  private final Logger log = Logger.getLogger(this.getClass().getName());
+  private String tableName;
+  private ByteArrayOutputStream bout;
+  private PrintStream originalPrintStream;
+
+  private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME");
+
+  private static void requireEnvVar() {
+    assertNotNull(
+        "Environment variable BIGQUERY_DATASET_NAME is required to perform these tests.",
+        System.getenv("BIGQUERY_DATASET_NAME"));
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar();
+  }
+
+  @Before
+  public void setUp() {
+    bout = new ByteArrayOutputStream();
+    PrintStream out = new PrintStream(bout);
+    originalPrintStream = System.out;
+    System.setOut(out);
+    tableName = "MY_TABLE_NAME_" + UUID.randomUUID().toString().replace("-", "_");
+  }
+
+  @After
+  public void tearDown() {
+    // Clean up
+    DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
+    // restores print statements in the original method
+    System.out.flush();
+    System.setOut(originalPrintStream);
+    log.log(Level.INFO, "\n" + bout.toString());
+  }
+
+  @Test
+  public void testCreateTable() {
+    Schema schema =
+        Schema.of(Field.of("timestampField", StandardSQLTypeName.TIMESTAMP));
+    CreateTableTimestamp.createTable(BIGQUERY_DATASET_NAME, tableName, schema);
+    assertThat(bout.toString()).contains("Table created successfully");
+  }
+}

samples/snippets/src/test/java/com/example/bigquery/QueryWithTimestampParametersIT.java

@@ -30,13 +30,12 @@ public class QueryWithTimestampParametersIT {
 
   private final Logger log = Logger.getLogger(this.getClass().getName());
   private ByteArrayOutputStream bout;
-  private PrintStream out;
   private PrintStream originalPrintStream;
 
   @Before
   public void setUp() {
     bout = new ByteArrayOutputStream();
-    out = new PrintStream(bout);
+    PrintStream out = new PrintStream(bout);
     originalPrintStream = System.out;
     System.setOut(out);
   }
@@ -54,4 +53,10 @@ public void testQueryWithTimestampParameters() {
     QueryWithTimestampParameters.queryWithTimestampParameters();
     assertThat(bout.toString()).contains("Query with timestamp parameter performed successfully.");
   }
+
+  @Test
+  public void testQueryFromTableTimestampParameters() {
+    QueryWithTimestampParameters.queryFromTableTimestampParameters();
+    assertThat(bout.toString()).contains("Query with timestamp parameter performed successfully.");
+  }
 }