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JRuby からAmazon DynamoDB Data にデータ連携

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

Amazon DynamoDB 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 Amazon DynamoDB\lib).

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

The connection to Amazon DynamoDB is made using your AccessKey, SecretKey, and optionally your Domain and Region. Your AccessKey and SecretKey can be obtained on the security credentials page for your Amazon Web Services account. Your Region will be displayed in the upper left-hand corner when you are logged into DynamoDB.

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

java -jar cdata.jdbc.amazondynamodb.jar

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

Below is a typical JDBC connection string for Amazon DynamoDB:

jdbc:amazondynamodb:Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;

Amazon DynamoDB Data への接続性を持つJRuby アプリを作成

Create a new Ruby file (for example: AmazonDynamoDBSelect.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 Amazon DynamoDB 2018/lib/cdata.jdbc.amazondynamodb.jar' url = "jdbc:amazondynamodb:Access Key=xxx;Secret Key=xxx;Domain=amazonaws.com;Region=OREGON;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT Industry, Revenue FROM Lead") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S AmazonDynamoDBSelect.rb

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

 
 
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