Bigtable 快速入門導覽課程 (HBase)

Cloud Bigtable 快速入門導覽課程，說明如何連線至執行個體，以及從資料表讀取資料列。

深入探索

如需包含這個程式碼範例的詳細說明文件，請參閱下列內容：

程式碼範例

Java

如要瞭解如何安裝及使用 Bigtable 的用戶端程式庫，請參閱這篇文章。

如要向 Bigtable 進行驗證，請設定應用程式預設憑證。 詳情請參閱「為本機開發環境設定驗證」。


package com.example.cloud.bigtable.quickstart;

import com.google.cloud.bigtable.hbase.BigtableConfiguration;

import java.io.IOException;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;

/**
 * A quickstart application that shows connecting to a Cloud Bigtable instance
 * using the native HBase API to read a row from a table.
 */
public class Quickstart {

  public static void main(String... args) {

    String projectId = args[0];  // my-gcp-project-id
    String instanceId = args[1]; // my-bigtable-instance-id
    String tableId = args[2];    // my-bigtable-table-id

    // Create a connection to the Cloud Bigtable instance.
    // Use try-with-resources to make sure the connection is closed correctly
    try (Connection connection = BigtableConfiguration.connect(projectId, instanceId)) {

      System.out.println("--- Connection established with Bigtable Instance ---");
      // Create a connection to the table that already exists
      // Use try-with-resources to make sure the connection to the table is closed correctly
      try (Table table = connection.getTable(TableName.valueOf(tableId))) {

        // Read a row
        String rowKey = "r1";
        System.out.printf("--- Reading for row-key: %s for provided table: %s ---\n",
            rowKey, tableId);

        // Retrieve the result
        Result result = table.get(new Get(Bytes.toBytes(rowKey)));

        // Convert row data to string
        String rowValue = Bytes.toString(result.value());

        System.out.printf("Scanned value for Row r1: %s \n", rowValue);

        System.out.println(" --- Finished reading row --- ");

      }  catch (IOException e) {
        // handle exception while connecting to a table
        throw e;
      }
    } catch (IOException e) {
      System.err.println("Exception while running quickstart: " + e.getMessage());
      e.printStackTrace();
    }
  }
}

後續步驟

如要搜尋及篩選其他 Google Cloud 產品的程式碼範例，請參閱Google Cloud 範例瀏覽器。