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Connect to Impala Data in JRuby

Create a simple JRuby app with access to live Impala data.

JRuby is a high-performance, stable, fully threaded Java implementation of the Ruby programming language. The CData JDBC Driver for Impala makes it easy to integrate connectivity to live Impala data in JRuby. This article shows how to create a simple JRuby app that connects to Impala data, executes a query, and displays the results.

Configure a JDBC Connection to Impala Data

Before creating the app, note the installation location for the JAR file for the JDBC Driver (typically C:\Program Files\CData\CData JDBC Driver for Impala\lib).

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

In order to connect to Apache Impala, set the Server, Port, and ProtocolVersion. You may optionally specify a default Database. To connect using alternative methods, such as NOSASL, LDAP, or Kerberos, refer to the online Help documentation.

Built-in Connection String Designer

For assistance in constructing the JDBC URL, use the connection string designer built into the Impala JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.

java -jar cdata.jdbc.apacheimpala.jar

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

Below is a typical JDBC connection string for Impala:

jdbc:apacheimpala:Server=127.0.0.1;Port=21050;

Create a JRuby App with Connectivity to Impala Data

Create a new Ruby file (for example: ApacheImpalaSelect.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 Impala 2018/lib/cdata.jdbc.apacheimpala.jar' url = "jdbc:apacheimpala:Server=127.0.0.1;Port=21050;" 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 Impala data with JRuby. To do so, simply run your file from the command line:

jruby -S ApacheImpalaSelect.rb

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