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Connect to Avro Data in JRuby
Create a simple JRuby app with access to live Avro data.
JRuby is a high-performance, stable, fully threaded Java implementation of the Ruby programming language. The CData JDBC Driver for Avro makes it easy to integrate connectivity to live Avro data in JRuby. This article shows how to create a simple JRuby app that connects to Avro data, executes a query, and displays the results.
Configure a JDBC Connection to Avro 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 Avro\lib).
JRuby natively supports JDBC, so you can easily connect to Avro and execute SQL queries. Initialize the JDBC connection with the getConnection function of the java.sql.DriverManager class.
Connect to your local Avro file(s) by setting the URI connection property to the location of the Avro file.Built-in Connection String Designer
For assistance in constructing the JDBC URL, use the connection string designer built into the Avro JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.
java -jar cdata.jdbc.avro.jar
Fill in the connection properties and copy the connection string to the clipboard.
Below is a typical JDBC connection string for Avro:
jdbc:avro:URI=C:/folder/table.avroInitiateOAuth=GETANDREFRESH
Create a JRuby App with Connectivity to Avro Data
Create a new Ruby file (for example: AvroSelect.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 Avro 2018/lib/cdata.jdbc.avro.jar'
url = "jdbc:avro:URI=C:/folder/table.avroInitiateOAuth=GETANDREFRESH"
conn = java.sql.DriverManager.getConnection(url)
stmt = conn.createStatement
rs = stmt.executeQuery("SELECT Id, Column1 FROM SampleTable_1")
while (rs.next) do
puts rs.getString(1) + ' ' + rs.getString(2)
end
With the file completed, you are ready to display your Avro data with JRuby. To do so, simply run your file from the command line:
jruby -S AvroSelect.rb
Writing SQL-92 queries to Avro allows you to quickly and easily incorporate Avro data into your own JRuby applications. Download a free trial today!
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