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JRuby からCloudant Data にデータ連携

リアルタイムCloudant 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 Cloudant を使用すると、JRuby からリアルタイムCloudant data へのデータ連携を簡単に実装できます。ここでは、Cloudant 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。

Cloudant 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 Cloudant\lib).

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

Set the following connection properties to connect to Cloudant:

  • User: Set this to your username.
  • Password: Set this to your password.


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

java -jar cdata.jdbc.cloudant.jar

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

Below is a typical JDBC connection string for Cloudant:

jdbc:cloudant:User=abc123; Password=abcdef;

Cloudant Data への接続性を持つJRuby アプリを作成

Create a new Ruby file (for example: CloudantSelect.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 Cloudant 2018/lib/cdata.jdbc.cloudant.jar' url = "jdbc:cloudant:User=abc123; Password=abcdef;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT MovieRuntime, MovieRating FROM Movies") while ( do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S CloudantSelect.rb

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