active_record_sanitized_query.rb

def prepare_sql params
  ActiveRecord::Base.send 'sanitize_sql_array', params
end

ActiveRecord::Base.connection.execute(prepare_sql ["update users set total_visits = total_visits + ? where id = ?", visits_increment, user_id])

active_record_simple_query.rb

ActiveRecord::Base.connection.execute('update users set total_visits = total_visits + 10 where id = 5')

active_record_simple_query_exp.rb

ActiveRecord::Base.connection.execute("update users set total_visits = total_visits + #{visits_increment} where id = #{user_id}")