Connect to HarperDB Data in Ruby

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HarperDB ODBC Driver

The HarperDB ODBC Driver is a powerful tool that allows you to connect with live data from HarperDB, directly from any applications that support ODBC connectivity.

Access HarperDB data like you would a relational database - read, write, and update HarperDB through a standard ODBC Driver interface.



Connect to HarperDB data in Ruby with ruby-dbi, dbd-odbc, and ruby-odbc.

The CData ODBC Driver for HarperDB makes it easy to integrate connectivity to live HarperDB data in Ruby. This article shows how to create a simple Ruby app that connects to HarperDB data, executes a query, and displays the results.

Create an ODBC Connection to HarperDB Data

If you have not already, first specify connection properties in an ODBC DSN (data source name). This is the last step of the driver installation. You can use the Microsoft ODBC Data Source Administrator to create and configure ODBC DSNs.

Set the Server, User, and Password connection properties to connect to HarperDB. Set UseSSL to secure connections with TLS/SSL.

Installing Ruby and Necessary Gems

If you do not have Ruby installed, refer to the Ruby installation page. With Ruby installed, you will need to install the ruby-dbi, dbd-odbc, and ruby-odbc gems:

gem install dbi gem install dbd-odbc gem install ruby-odbc

Create a Ruby App with Connectivity to HarperDB Data

Create a new Ruby file (for example: HarperDBSelect.rb) and open it in a text editor. Copy the following code into your file:

#connect to the DSN require 'DBI' cnxn = DBI.connect('DBI:ODBC:CData HarperDB Source','','') #execute a SELECT query and store the result set resultSet = cnxn.execute("SELECT City, CompanyName FROM Customers WHERE Country = 'US'") #display the names of the columns resultSet.column_names.each do |name| print name, "\t" end puts #display the results while row = resultSet.fetch do (0..resultSet.column_names.size - 1).each do |n| print row[n], "\t" end puts end resultSet.finish #close the connection cnxn.disconnect if cnxn

With the file completed, you are ready to display your HarperDB data with Ruby. To do so, simply run your file from the command line:

ruby HarperDBSelect.rb Writing SQL-92 queries to HarperDB allows you to quickly and easily incorporate HarperDB data into your own Ruby applications. Download a free trial today!