Example of em-mysqlplus

sample.rb

require 'fiber'
require 'em-synchrony'
require 'em-mysqlplus'
require 'benchmark'

EventMachine.synchrony do
  db = EventMachine::Synchrony::ConnectionPool.new(size: 5) do
    EventMachine::MySQL.new(host: 'localhost')
  end

  multi = EventMachine::Synchrony::Multi.new
  multi.add :a, db.aquery("select sleep(1)")
  multi.add :b, db.aquery("select sleep(1)")
  res = multi.perform

  p res

  EventMachine.stop
end

Sample code from http://www.slideshare.net/igrigorik/beyond-gem-install-mysql-in-ruby

When I run this, I get this error:

/home/jimmys/lib/ruby/gems/1.9.1/gems/em-synchrony-0.1.5/lib/em-synchrony/connection_pool.rb:73:in `block in method_missing': undefined method `callback' for nil:NilClass (NoMethodError)
    from /home/jimmys/lib/ruby/gems/1.9.1/gems/em-synchrony-0.1.5/lib/em-synchrony/connection_pool.rb:23:in `execute'
    from /home/jimmys/lib/ruby/gems/1.9.1/gems/em-synchrony-0.1.5/lib/em-synchrony/connection_pool.rb:68:in `method_missing'
    from db2.rb:14:in `block in <main>'
    from /home/jimmys/lib/ruby/gems/1.9.1/gems/em-synchrony-0.1.5/lib/em-synchrony.rb:22:in `call'
    from /home/jimmys/lib/ruby/gems/1.9.1/gems/em-synchrony-0.1.5/lib/em-synchrony.rb:22:in `block (2 levels) in synchrony'

I'm getting this too, just ran into it. Did you ever find a solution for this?

Yes my example was missing this:

require "em-synchrony/em-mysqlplus"

Yep, that did it. Thank you!