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JRuby からGoogle Spanner Data にデータ連携

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

Google Spanner 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 Google Spanner\lib).

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

Google Spanner uses the OAuth authentication standard. To authenticate using OAuth, you can use the embedded credentials or register an app with Google.

See the Getting Started guide in the CData driver documentation for more information.

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

java -jar cdata.jdbc.googlespanner.jar

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

Below is a typical JDBC connection string for Google Spanner:

jdbc:googlespanner:ProjectId='project1';InstanceId='instance1';Database='db1';InitiateOAuth=GETANDREFRESH

Google Spanner Data への接続性を持つJRuby アプリを作成

Create a new Ruby file (for example: GoogleSpannerSelect.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 Google Spanner 2018/lib/cdata.jdbc.googlespanner.jar' url = "jdbc:googlespanner:ProjectId='project1';InstanceId='instance1';Database='db1';InitiateOAuth=GETANDREFRESH" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT Name, TotalDue FROM Customer") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S GoogleSpannerSelect.rb

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

 
 
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