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Connect to Elasticsearch Data in Ruby
Connect to Elasticsearch data in Ruby with ruby-dbi, dbd-odbc, and ruby-odbc.
The CData ODBC Driver for Elasticsearch makes it easy to integrate connectivity to live Elasticsearch data in Ruby. This article shows how to create a simple Ruby app that connects to Elasticsearch data, executes a query, and displays the results.
Create an ODBC Connection to Elasticsearch 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 and Port connection properties to connect. To authenticate, set the User and Password properties, PKI (public key infrastructure) properties, or both. To use PKI, set the SSLClientCert, SSLClientCertType, SSLClientCertSubject, and SSLClientCertPassword properties.
The data provider uses X-Pack Security for TLS/SSL and authentication. To connect over TLS/SSL, prefix the Server value with 'https://'. Note: TLS/SSL and client authentication must be enabled on X-Pack to use PKI.
Once the data provider is connected, X-Pack will then perform user authentication and grant role permissions based on the realms you have configured.
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 Elasticsearch Data
Create a new Ruby file (for example: ElasticsearchSelect.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 Elasticsearch Source','','')
#execute a SELECT query and store the result set
resultSet = cnxn.execute("SELECT Orders.Freight, Customers.ContactName FROM Customers INNER JOIN Orders ON Customers.CustomerId=Orders.CustomerId")
#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 Elasticsearch data with Ruby. To do so, simply run your file from the command line:
ruby ElasticsearchSelect.rb
Writing SQL-92 queries to Elasticsearch allows you to quickly and easily incorporate Elasticsearch data into your own Ruby applications. Download a free trial today!
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Elasticsearch ODBC Driver
The Elasticsearch ODBC Driver is a powerful tool that allows you to connect with live Elasticsearch document databases, directly from any applications that support ODBC connectivity.
Access Elasticsearch like you would a database - read, write, and update through a standard ODBC Driver interface.
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