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JRuby からQuandl Data にデータ連携

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

Quandl 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 Quandl\lib).

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

Quandl uses an API key for authentication. See the help documentation for a guide to obtaining the APIKey property.

Additionally, set the DatabaseCode connection property to the code identifying the Database whose Datasets you want to query with SQL. You can search the available Databases by querying the Databases view.

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 Quandl JDBC Driver.Either double-click the JAR file or execute the jar file from the command-line.

java -jar cdata.jdbc.quandl.jar

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

Below is a typical JDBC connection string for Quandl:

jdbc:quandl:APIKey=abc123;DatabaseCode=WIKI;

Quandl Data への接続性を持つJRuby アプリを作成

Create a new Ruby file (for example: QuandlSelect.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 Quandl 2018/lib/cdata.jdbc.quandl.jar' url = "jdbc:quandl:APIKey=abc123;DatabaseCode=WIKI;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT Date, Volume FROM AAPL") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S QuandlSelect.rb

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

 
 
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