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Connect to HBase Data in JRuby
Create a simple JRuby app with access to live HBase data.
JRuby is a high-performance, stable, fully threaded Java implementation of the Ruby programming language. The CData JDBC Driver for HBase makes it easy to integrate connectivity to live HBase data in JRuby. This article shows how to create a simple JRuby app that connects to HBase data, executes a query, and displays the results.
Configure a JDBC Connection to HBase 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 HBase\lib).
JRuby natively supports JDBC, so you can easily connect to HBase and execute SQL queries. Initialize the JDBC connection with the getConnection function of the java.sql.DriverManager class.
Set the Port and Server to connect to Apache HBase.
Built-in Connection String Designer
For assistance in constructing the JDBC URL, use the connection string designer built into the HBase JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.
java -jar cdata.jdbc.apachehbase.jar
Fill in the connection properties and copy the connection string to the clipboard.
Below is a typical JDBC connection string for HBase:
jdbc:apachehbase:Server=127.0.0.1;Port=8080;
Create a JRuby App with Connectivity to HBase Data
Create a new Ruby file (for example: ApacheHBaseSelect.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 HBase 2018/lib/cdata.jdbc.apachehbase.jar'
url = "jdbc:apachehbase:Server=127.0.0.1;Port=8080;"
conn = java.sql.DriverManager.getConnection(url)
stmt = conn.createStatement
rs = stmt.executeQuery("SELECT CustomerName, Price FROM Customers")
while (rs.next) do
puts rs.getString(1) + ' ' + rs.getString(2)
end
With the file completed, you are ready to display your HBase data with JRuby. To do so, simply run your file from the command line:
jruby -S ApacheHBaseSelect.rb
Writing SQL-92 queries to HBase allows you to quickly and easily incorporate HBase data into your own JRuby applications. Download a free trial today!
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HBase JDBC Driver
Rapidly create and deploy powerful Java applications that integrate with Apache HBase columnar databases.
