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Editorial Team
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Asked: 2026-06-09T19:54:26+00:00

I just started with Ruby and I am playing with Sinatra, but could not

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I just started with Ruby and I am playing with Sinatra, but could not find a way to share database connections between requests.

I came from Java web developement and one of the basic things you have to do is to pool the database connections, so I am sure that something similar exists in Ruby, but I just can’t find it.

ActiveRecord and DataMapper offer this feature but I don’t need ORM and just want to make regular SQL queries.

Is there some specific approach for Sinatra or there are general ways for all Rack-based applications?

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  1. Editorial Team

    To persist a connection, you need only create an instance variable (Sinatra Applications are just objects anyway) or a global variable. Or a class that manages connections for you. Most Ruby database libraries I’ve seen are Database Adapters or just clients.

    @db = Mysql2::Client.new #...

    Or a global variable:

    $db = Mysql2::Client.new #...

    Connection pooling is just a way to share a small number of connections across multiple threads/fibers for the lifespan of the application. Java, the JVM, as far as I know doesn’t share connections between processes.

    However, there is a general purpose Connection Pool library for Ruby.

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