递增单元格 (HBase)

发送用于递增现有数值的写入请求。这种类型的写入会发出 ReadModifyWriteRow API 请求。

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如需查看包含此代码示例的详细文档,请参阅以下内容:

代码示例

Java

如需了解如何安装和使用 Bigtable 的客户端库,请参阅 Bigtable 客户端库


import com.google.cloud.bigtable.hbase.BigtableConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;

public class WriteIncrement {

  private static final byte[] COLUMN_FAMILY_NAME = Bytes.toBytes("stats_summary");

  public static void writeIncrement(String projectId, String instanceId, String tableId) {
    // String projectId = "my-project-id";
    // String instanceId = "my-instance-id";
    // String tableId = "mobile-time-series";

    try (Connection connection = BigtableConfiguration.connect(projectId, instanceId)) {
      Table table = connection.getTable(TableName.valueOf(Bytes.toBytes(tableId)));

      String rowKey = "phone#4c410523#20190501";

      table.incrementColumnValue(
          Bytes.toBytes(rowKey), COLUMN_FAMILY_NAME, Bytes.toBytes("connected_cell"), -1);

      System.out.printf("Successfully updated row %s", rowKey);

    } catch (Exception e) {
      System.out.println("Error during WriteIncrement: \n" + e.toString());
    }
  }
}

后续步骤

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