# File lib/active_record/connection_adapters/mysql_adapter.rb, line 47
    def self.require_mysql
      # Include the MySQL driver if one hasn't already been loaded
      unless defined? Mysql
        begin
          require_library_or_gem 'mysql'
        rescue LoadError => cannot_require_mysql
          # Use the bundled Ruby/MySQL driver if no driver is already in place
          begin
            ActiveRecord::Base.logger.info(
              "WARNING: You're using the Ruby-based MySQL library that ships with Rails. This library is not suited for production. " +
              "Please install the C-based MySQL library instead (gem install mysql)."
            ) if ActiveRecord::Base.logger

            require 'active_record/vendor/mysql'
          rescue LoadError
            raise cannot_require_mysql
          end
        end
      end

      # Define Mysql::Result.all_hashes
      MysqlCompat.define_all_hashes_method!
    end