Run Raw SQL in Rails after connecting to Database

问题

I'd like my Rails app to run a raw sql command after it establishes the connection to the DB. In which file does that belong? One of the config/initializers?

回答1:

I use monkeypatching to force strict mode for MySQL, the same approach should also work in your case. This code belongs in an initializer.

class ActiveRecord::ConnectionAdapters::Mysql2Adapter

private
  alias_method :configure_connection_without_autocommit, :configure_connection

  def configure_connection
    configure_connection_without_autocommit
    execute "COMMAND_TO_ENABLE_AUTOCOMMIT"
  end
end

For reference, here's the source code for Mysql2Adapter.

回答2:

I think You can write a rake filter, through which you can fire a query before each inbound call. You can read more about this here.

来源：https://stackoverflow.com/questions/29224331/run-raw-sql-in-rails-after-connecting-to-database