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Connect to Hive Data in JRuby
Create a simple JRuby app with access to live Hive data.
JRuby is a high-performance, stable, fully threaded Java implementation of the Ruby programming language. The CData JDBC Driver for Hive makes it easy to integrate connectivity to live Hive data in JRuby. This article shows how to create a simple JRuby app that connects to Hive data, executes a query, and displays the results.
Configure a JDBC Connection to Hive 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 Hive\lib).
JRuby natively supports JDBC, so you can easily connect to Hive and execute SQL queries. Initialize the JDBC connection with the getConnection function of the java.sql.DriverManager class.
Set the Server, Port, TransportMode, and AuthScheme connection properties to connect to Hive.Built-in Connection String Designer
For assistance in constructing the JDBC URL, use the connection string designer built into the Hive JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.
java -jar cdata.jdbc.apachehive.jar
Fill in the connection properties and copy the connection string to the clipboard.
Below is a typical JDBC connection string for Hive:
jdbc:apachehive:Server=127.0.0.1;Port=10000;TransportMode=BINARY;
Create a JRuby App with Connectivity to Hive Data
Create a new Ruby file (for example: ApacheHiveSelect.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 Hive 2018/lib/cdata.jdbc.apachehive.jar'
url = "jdbc:apachehive:Server=127.0.0.1;Port=10000;TransportMode=BINARY;"
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 Hive data with JRuby. To do so, simply run your file from the command line:
jruby -S ApacheHiveSelect.rb
Writing SQL-92 queries to Hive allows you to quickly and easily incorporate Hive data into your own JRuby applications. Download a free trial today!
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