ActiveRecord SQL execution time

问题

How can I get the SQL query execution time in rails? I can see the time in logs, e.g.:

 Posting Load (10.8ms)  SELECT "postings".* FROM "postings" ORDER BY "postings"."id" ASC LIMIT 1

But how can I get that value (10.08) programmatically to use it further in my code?

回答1:

You can use ActiveSupport::Notifications to retrieve the runtime of the SQL statements

You should be able to instrument sql.active_record to see how long the SQL call takes

ActiveSupport::Notifications.subscribe('sql.active_record') do |*args|
  event = ActiveSupport::Notifications::Event.new(*args)
  event.duration #how long it took to run the sql command
end

This code was not tested, so I can't guarantee it works, but it should

回答2:

try this out

time_consumed = Benchmark.measure { Post.limit(1) }

来源：https://stackoverflow.com/questions/18240624/activerecord-sql-execution-time