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JRuby からRedis Data にデータ連携

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

Redis 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 Redis\lib).

JRuby natively supports JDBC, so you can easily connect to Redis 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 a Redis instance:

  • Server: Set this to the name or address of the server your Redis instance is running on. You can specify the port in Port.
  • Password: Set this to the password used to authenticate with a password-protected Redis instance , using the Redis AUTH command.

Set UseSSL to negotiate SSL/TLS encryption when you connect.

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

java -jar cdata.jdbc.redis.jar

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

Below is a typical JDBC connection string for Redis:

jdbc:redis:Server=127.0.0.1;Port=6379;Password=myPassword;

Redis Data への接続性を持つJRuby アプリを作成

Create a new Ruby file (for example: RedisSelect.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 Redis 2018/lib/cdata.jdbc.redis.jar' url = "jdbc:redis:Server=127.0.0.1;Port=6379;Password=myPassword;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT City, CompanyName FROM Customers") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S RedisSelect.rb

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

 
 
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