PyCharm でCData ODBC Driver for HDFS を使ってみた

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HDFS ODBC Driver

HDFS ODBC Driver を使って、ODBC 接続をサポートするあらゆるアプリケーション・ツールからHDFS にデータ連携。

HDFS データにデータベースと同感覚でアクセスして、HDFS データに使い慣れたODBC インターフェースで双方向連携。



HDFS にODBC データソースとしてPyCharm から連携。

CData ODBC Drivers は、ODBC をサポートするあらゆる環境から利用可能です。 本記事では、PyCharm からのCData ODBC Driver for HDFS の利用を説明します。ODBC Deriver をデータソースとして設定する方法、データソースをクエリするPyCharm のベーシックな方法を含みます。

To begin, this tutorial will assume that you have already installed the CData ODBC Driver for HDFS as well as PyCharm.

Pyodbc をプロジェクトに追加

Follow the steps below to add the pyodbc module to your project.

  1. Click File -> Settings to open the project settings window.
  2. Click Project Interpreter from the Project: YourProjectName menu.
  3. To add pyodbc, click the + button and enter pyodbc.
  4. Click Install Package to install pyodbc.

HDFS への接続

You can now connect with an ODBC connection string or a DSN. See the Getting Started section in the CData driver documentation for a guide to creating a DSN on your OS.

In order to authenticate, set the following connection properties:

  • Host: Set this value to the host of your HDFS installation.
  • Port: Set this value to the port of your HDFS installation. Default port: 50070

Below is the syntax for a DSN:

[CData HDFS Source] Driver = CData ODBC Driver for HDFS Description = My Description Host = sandbox-hdp.hortonworks.com Port = 50070 Path = /user/root User = root

HDFS へのクエリの実行

Instantiate a Cursor and use the execute method of the Cursor class to execute any SQL statement.

import pyodbc cnxn = pyodbc.connect('DRIVER={CData ODBC Driver for HDFS};Host = sandbox-hdp.hortonworks.com;Port = 50070;Path = /user/root;User = root;') cursor = cnxn.cursor() cursor.execute("SELECT FileId, ChildrenNum FROM Files WHERE FileId = '119116'") rows = cursor.fetchall() for row in rows: print(row.FileId, row.ChildrenNum)

After connecting to HDFS in PyCharm using the CData ODBC Driver, you will be able to build Python apps with access to HDFS data as if it were a standard database. If you have any questions, comments, or feedback regarding this tutorial, please contact us at support@cdata.com.