Viewing HDFS データ in RAD Studio Data Explorer

How to view HDFS データ in RAD Studio Data Explorer using the CData ODBC Driver for HDFS.

最終更新日：2023-06-12

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

Configure a Connection to HDFS

If you have not already, first specify connection properties in an ODBC DSN (data source name). This is the last step of the driver installation. You can use the Microsoft ODBC Data Source Administrator to create and configure ODBC DSNs.

HDFS 接続プロパティの取得・設定方法

HDFS への認証には、次の接続プロパティを設定します。

Host：HDFS インスタンスのホストに設定してください。
Port: HDFS インスタンスのポートに設定してください。デフォルトのポートは"50070" です。

Connecting to HDFS データ Using Data Explorer

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

Open the Data Explorer in RAD Studio and expand FireDAC.
Right-click the ODBC Data Source node in the Data Explorer.
Click Add New Connection.
Enter a name for the connection.
In the FireDAC Connection Editor that appears, set the DataSource property to the name of the ODBC DSN for HDFS.
Back in the Data Explorer, expand the views for the connection.
Create a new VCL Forms application and drag a view (for example: Files) onto the form.
Select the FilesView object on the form and set the Active property to true.
Right-click on the object, bind visually, and link everything (*) to a new control (TStringGrid).
Arrange the TStringGrid on the form and run the application to see the Files data.