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