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Connect to OData Services in JRuby
Create a simple JRuby app with access to live OData services.
JRuby is a high-performance, stable, fully threaded Java implementation of the Ruby programming language. The CData JDBC Driver for OData makes it easy to integrate connectivity to live OData services in JRuby. This article shows how to create a simple JRuby app that connects to OData services, executes a query, and displays the results.
About OData Data Integration
CData simplifies access and integration of live OData services data. Our customers leverage CData connectivity to:
- Access OData versions 2.0, 3.0, and 4.0, working with legacy services and the latest features and capabilities.
- Leverage advanced query options, including $filter, $select, and $expand, enhancing data retrieval from 3rd party tools.
- Use Server-side execution of aggregation and grouping to minimize data transfer and boost performance.
- Authenticate securely using a variety of schemes, including Azure AD, digest, negotiate, NTLM, OAuth, and more means secure authentication with every connection.
- Use SQL stored procedures to manage OData service entities - listing, creating, and removing associations between entities.
Customers use CData's solutions to regularly integrate their OData services with preferred tools, such as Power BI, MicroStrategy, or Tableau, and to replicate data from OData services to their databases or data warehouses.
Getting Started
Configure a JDBC Connection to OData Services
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 OData\lib).
JRuby natively supports JDBC, so you can easily connect to OData and execute SQL queries. Initialize the JDBC connection with the getConnection function of the java.sql.DriverManager class.
The User and Password properties, under the Authentication section, must be set to valid OData user credentials. In addition, you will need to specify a URL to a valid OData server organization root or OData services file.
Built-in Connection String Designer
For assistance in constructing the JDBC URL, use the connection string designer built into the OData JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.
java -jar cdata.jdbc.odata.jar
Fill in the connection properties and copy the connection string to the clipboard.
Below is a typical JDBC connection string for OData:
jdbc:odata:URL=http://services.odata.org/V4/Northwind/Northwind.svc;UseIdUrl=True;OData Version=4.0;Data Format=ATOM;
Create a JRuby App with Connectivity to OData Services
Create a new Ruby file (for example: ODataSelect.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 OData 2018/lib/cdata.jdbc.odata.jar'
url = "jdbc:odata:URL=http://services.odata.org/V4/Northwind/Northwind.svc;UseIdUrl=True;OData Version=4.0;Data Format=ATOM;"
conn = java.sql.DriverManager.getConnection(url)
stmt = conn.createStatement
rs = stmt.executeQuery("SELECT OrderName, Freight FROM Orders")
while (rs.next) do
puts rs.getString(1) + ' ' + rs.getString(2)
end
With the file completed, you are ready to display your OData services with JRuby. To do so, simply run your file from the command line:
jruby -S ODataSelect.rb
Writing SQL-92 queries to OData allows you to quickly and easily incorporate OData services into your own JRuby applications. Download a free trial today!
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OData JDBC Driver
Easy-to-use OData client (consumer) enables developers to build Java applications that easily communicate with OData services.
