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JRuby からMongoDB Data にデータ連携

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

MongoDB 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 MongoDB\lib).

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

Set the Server, Database, User, and Password connection properties to connect to MongoDB. To access MongoDB collections as tables you can use automatic schema discovery or write your own schema definitions. Schemas are defined in .rsd files, which have a simple format. You can also execute free-form queries that are not tied to the schema.

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

java -jar cdata.jdbc.mongodb.jar

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

Below is a typical JDBC connection string for MongoDB:

jdbc:mongodb:Server=MyServer;Port=27017;Database=test;User=test;Password=Password;

MongoDB Data への接続性を持つJRuby アプリを作成

Create a new Ruby file (for example: MongoDBSelect.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 MongoDB 2018/lib/cdata.jdbc.mongodb.jar' url = "jdbc:mongodb:Server=MyServer;Port=27017;Database=test;User=test;Password=Password;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT borough, cuisine FROM restaurants") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S MongoDBSelect.rb

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

 
 
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