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Viewing Spark Data in RAD Studio Data Explorer

How to view Spark data in RAD Studio Data Explorer using the CData FireDAC Components for Spark.

Embarcadero RAD Studio provides a development environment for Delphi and C++Builder applications. With the CData FireDAC Components for Spark, you gain access to live Spark data within RAD Studio, abstracting the data into tables, views, and stored procedures that can be used to both retrieve and update Spark data. This article will walk through connecting to Spark using the Data Explorer.

Connecting to Spark Data Using Data Explorer

You can create a simple application for displaying Spark data by utilizing the CData FireDAC Components for Spark and a new VCL Forms Application:

  1. Open the Data Explorer in RAD Studio and expand FireDAC.
  2. Right-click on CData Spark Data Source and click Add New Connection.

  3. Name the connection.
  4. Fill in the necessary connection parameters and click OK.

    SparkSQL への接続

    SparkSQL への接続を確立するには以下を指定します。

    • Server:SparkSQL をホストするサーバーのホスト名またはIP アドレスに設定。
    • Port:SparkSQL インスタンスへの接続用のポートに設定。
    • TransportMode:SparkSQL サーバーとの通信に使用するトランスポートモード。有効な入力値は、BINARY およびHTTP です。デフォルトではBINARY が選択されます。
    • AuthScheme:使用される認証スキーム。有効な入力値はPLAIN、LDAP、NOSASL、およびKERBEROS です。デフォルトではPLAIN が選択されます。

    Databricks への接続

    Databricks クラスターに接続するには、以下の説明に従ってプロパティを設定します。Note:The needed values can be found in your Databricks instance by navigating to 'Clusters', selecting the desired cluster, and selecting the JDBC/ODBC tab under 'Advanced Options'.

    • Server:Set to the Server Hostname of your Databricks cluster.
    • Port:443
    • TransportMode:HTTP
    • HTTPPath:Set to the HTTP Path of your Databricks cluster.
    • UseSSL:True
    • AuthScheme:PLAIN
    • User:'token' に設定。
    • Password:Set to your personal access token (value can be obtained by navigating to the User Settings page of your Databricks instance and selecting the Access Tokens tab).

  5. Back in the Data Explorer, expand the tables for the connection.
  6. Create a new VCL Forms application and drag a table (for example: Customers) onto the form.

  7. Select the CustomersTable object on the form and set the Active property to true.
  8. Right-click on the object, bind visually, and link everything (*) to a new control (TStringGrid).

  9. Arrange the TStringGrid on the form and run the application to see the Customers data.

 
 
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