# File lib/dbi.rb, line 222
222:         def disconnect_all( driver = nil )
223:             if driver.nil?
224:                 @@driver_map.each {|k,v| v[0].disconnect_all}
225:             else
226:                 db_driver, = parse_url(driver)
227:                 @@driver_map[db_driver][0].disconnect_all
228:             end
229:         end