PostgreSQL monkey patching query execution

I am trying to do something simple. I would like to print the pure sql before its execution and then to print the response when the query finishes. I think that I should monkey patch one of these two methods but the sql queries of the application do not use them.

Any idea how can I do it?

I know that it sounds stupid, but then I will extend this logic.

require 'active_record/connection_adapters/postgresql_adapter'

class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
  def query(sql, name = nil) #:nodoc:
    File.open("file1", "a") { |f| f.write sql  + "\n\n" }
    log(sql, name) do
      result_as_array @connection.async_exec(sql)
      File.open("file1", "a") { |f| f.write "RESPONSE \n\n" }
    end
  end

  def execute(sql, name = nil)
    File.open("file2", "a") { |f| f.write sql + "\n\n" }
    log(sql, name) do
      @connection.async_exec(sql)
      File.open("file2", "a") { |f| f.write "RESPONSE \n\n" }
    end
  end
end