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JRuby からRedshift Data にデータ連携

リアルタイムRedshift data に連携するシンプルなJRuby アプリケーションを作成します。

JRuby はRuby プログラミング言語の高性能で安定した、完全にスレッド化されたJava 実装です。CData JDBC Driver for Redshift を使用すると、JRuby からリアルタイムRedshift data へのデータ連携を簡単に実装できます。ここでは、Redshift data に接続し、クエリを実行して結果を表示する簡単なJRuby アプリを作成する方法を説明します。

Redshift Data にJDBC で接続

Before creating the app, note the installation location for the JAR file for the JDBC Driver (typically C:\Program Files\CDatat\CData JDBC Driver for Redshift\lib).

JRuby natively supports JDBC, so you can easily connect to Redshift and execute SQL queries.Initialize the JDBC connection with the getConnection function of the java.sql.DriverManager class.

To connect to Redshift, set the following:

  • Server: Set this to the host name or IP address of the cluster hosting the Database you want to connect to.
  • Port: Set this to the port of the cluster.
  • Database: Set this to the name of the database. Or, leave this blank to use the default database of the authenticated user.
  • User: Set this to the username you want to use to authenticate to the Server.
  • Password: Set this to the password you want to use to authenticate to the Server.

You can obtain the Server and Port values in the AWS Management Console:

  1. Open the Amazon Redshift console (http://console.aws.amazon.com/redshift).
  2. On the Clusters page, click the name of the cluster.
  3. On the Configuration tab for the cluster, copy the cluster URL from the connection strings displayed.

ビルトイン接続文字列デザイナー

For assistance in constructing the JDBC URL, use the connection string designer built into the Redshift JDBC Driver.Either double-click the JAR file or execute the jar file from the command-line.

java -jar cdata.jdbc.redshift.jar

Fill in the connection properties and copy the connection string to the clipboard.

Below is a typical JDBC connection string for Redshift:

jdbc:redshift:User=admin;Password=admin;Database=dev;Server=examplecluster.my.us-west-2.redshift.amazonaws.com;Port=5439;

Redshift Data への接続性を持つJRuby アプリを作成

Create a new Ruby file (for example: RedshiftSelect.rb) and open it in a text editor.Copy the following code into your file:

require 'java' require 'rubygems' require 'C:/Program Files/CData/CData JDBC Driver for Redshift 2018/lib/cdata.jdbc.redshift.jar' url = "jdbc:redshift:User=admin;Password=admin;Database=dev;Server=examplecluster.my.us-west-2.redshift.amazonaws.com;Port=5439;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT ShipName, ShipCity FROM Orders") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

With the file completed, you are ready to display your Redshift data with JRuby.To do so, simply run your file from the command line:

jruby -S RedshiftSelect.rb

Writing SQL-92 queries to Redshift allows you to quickly and easily incorporate Redshift data into your own JRuby applications.Download a free trial today!

 
 
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